$NI
NISOURCE INC. Stock $ni

$ni Overview Financials Valuation SEC Filings Company Website

2012 Q3 Form 10-K Financial Statement

#000111171113000007 Filed on February 19, 2013

Income Statement

Concept	2012 Q3	2012 Q2	2012 Q1
Revenue	$956.2M	$1.039B	$1.650B
YoY Change	-9.56%	-14.68%	-25.71%
Cost Of Revenue	$227.2M	$238.8M	$627.4M
YoY Change	-29.68%	-48.37%	-46.42%
Gross Profit	$729.0M	$800.0M	$1.022B
YoY Change	-2.23%	4.47%	-3.7%
Gross Profit Margin	76.24%	77.01%	61.91%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$125.3M	$147.3M	$145.4M
YoY Change	-7.12%	9.52%	8.27%
% of Gross Profit	17.19%	18.41%	14.23%
Operating Expenses	$605.5M	$603.5M	$631.5M
YoY Change	0.63%	0.15%	-3.82%
Operating Profit	$131.5M	$202.4M	$399.6M
YoY Change	-7.85%	25.25%	-0.99%
Interest Expense	$107.9M	$103.2M	$103.3M
YoY Change	12.75%	9.32%	-219.01%
% of Operating Profit	82.05%	50.99%	25.85%
Other Income/Expense, Net	-$105.7M	-$100.4M	-$103.0M
YoY Change	12.33%	7.04%	-3221.21%
Pretax Income	$25.80M	$104.6M	$294.7M
YoY Change	-51.59%	45.89%	-7.88%
Income Tax	$9.200M	$36.30M	$102.2M
% Of Pretax Income	35.66%	34.7%	34.68%
Net Earnings	$19.30M	$69.40M	$193.4M
YoY Change	-44.38%	72.64%	-7.68%
Net Earnings / Revenue	2.02%	6.68%	11.72%
Basic Earnings Per Share	$0.06	$0.24	$0.68
Diluted Earnings Per Share	$0.06	$0.22	$0.66
COMMON SHARES
Basic Shares Outstanding	290.3M shares	284.4M shares	282.9M shares
Diluted Shares Outstanding	300.0M shares	295.8M shares	293.1M shares

Balance Sheet

Concept	2012 Q3	2012 Q2	2012 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$12.00M	$53.00M	$39.00M
YoY Change	-45.45%	-11.67%	-38.1%
Cash & Equivalents	$12.30M	$52.80M	$38.50M
Short-Term Investments
Other Short-Term Assets	$280.8M	$274.2M	$770.0M
YoY Change	-55.92%	-46.96%	38.24%
Inventory	$540.0M	$428.0M	$354.0M
Prepaid Expenses
Receivables	$526.2M	$553.3M	$730.0M
Other Receivables	$87.00M	$44.00M	$77.00M
Total Short-Term Assets	$1.839B	$1.752B	$1.970B
YoY Change	-1.2%	0.38%	-0.76%
LONG-TERM ASSETS
Property, Plant & Equipment	$12.54B	$12.15B	$11.90B
YoY Change	8.61%	7.56%	6.83%
Goodwill	$3.677B	$3.677B
YoY Change
Intangibles
YoY Change
Long-Term Investments	$412.0M	$368.0M	$361.0M
YoY Change	12.88%	5.75%	6.49%
Other Assets	$6.045B	$6.140B	$2.240B
YoY Change	203.63%	210.43%	10.29%
Total Long-Term Assets	$19.00B	$18.66B	$18.48B
YoY Change	6.26%	6.0%	5.61%
TOTAL ASSETS
Total Short-Term Assets	$1.839B	$1.752B	$1.970B
Total Long-Term Assets	$19.00B	$18.66B	$18.48B
Total Assets	$20.84B	$20.41B	$20.45B
YoY Change	5.55%	5.5%	4.96%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$300.1M	$292.1M	$381.0M
YoY Change	22.99%	-7.56%	-11.4%
Accrued Expenses	$342.0M	$363.0M	$337.0M
YoY Change	-1.16%	-1.36%	0.9%
Deferred Revenue
YoY Change
Short-Term Debt	$225.3M	$327.6M	$1.264B
YoY Change	-81.74%	-62.34%	0.1%
Long-Term Debt Due	$823.0M	$767.0M	$751.0M
YoY Change	10187.5%	2456.67%	1986.11%
Total Short-Term Liabilities	$2.727B	$2.662B	$3.718B
YoY Change	-5.54%	4.08%	20.09%
LONG-TERM LIABILITIES
Long-Term Debt	$6.820B	$6.807B	$5.834B
YoY Change	7.62%	7.37%	-1.59%
Other Long-Term Liabilities	$246.2M	$242.1M	$3.053B
YoY Change	-91.76%	-91.85%	1.9%
Total Long-Term Liabilities	$5.881B	$5.835B	$8.887B
YoY Change	-36.93%	-37.32%	-0.41%
TOTAL LIABILITIES
Total Short-Term Liabilities	$2.727B	$2.662B	$3.718B
Total Long-Term Liabilities	$5.881B	$5.835B	$8.887B
Total Liabilities	$8.608B	$8.497B	$15.37B
YoY Change	-41.65%	-40.76%	6.22%
SHAREHOLDERS EQUITY
Retained Earnings	$925.7M	$980.9M
YoY Change
Common Stock	$4.582B	$4.224B
YoY Change
Preferred Stock
YoY Change
Treasury Stock (at cost)	$40.50M	$40.50M
YoY Change
Treasury Stock Shares
Shareholders Equity	$5.411B	$5.105B	$5.081B
YoY Change
Total Liabilities & Shareholders Equity	$20.84B	$20.41B	$20.45B
YoY Change	5.55%	5.5%	4.96%

Cashflow Statement

Concept	2012 Q3	2012 Q2	2012 Q1
OPERATING ACTIVITIES
Net Income	$19.30M	$69.40M	$193.4M
YoY Change	-44.38%	72.64%	-7.68%
Depreciation, Depletion And Amortization	$125.3M	$147.3M	$145.4M
YoY Change	-7.12%	9.52%	8.27%
Cash From Operating Activities	$170.0M	$291.8M	$480.0M
YoY Change	192.6%	-7.04%	13.72%
INVESTING ACTIVITIES
Capital Expenditures	-$402.7M	-$326.9M	$291.8M
YoY Change	22.33%	38.75%	-239.35%
Acquisitions
YoY Change
Other Investing Activities	$20.30M	$52.70M	$10.40M
YoY Change	-141.18%	-514.96%	-69.68%
Cash From Investing Activities	-$382.4M	-$274.2M	-$294.7M
YoY Change	1.03%	10.43%	68.3%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			-$7.500M
YoY Change
Debt Paid & Issued, Net			$5.900M
YoY Change
Cash From Financing Activities	171.9M	-3.300M	-$158.3M
YoY Change	-39.19%	-95.16%	-18.28%
NET CHANGE
Cash From Operating Activities	170.0M	291.8M	$480.0M
Cash From Investing Activities	-382.4M	-274.2M	-$294.7M
Cash From Financing Activities	171.9M	-3.300M	-$158.3M
Net Change In Cash	-40.50M	14.30M	$27.00M
YoY Change	7.43%	-650.0%	-49.34%
FREE CASH FLOW
Cash From Operating Activities	$170.0M	$291.8M	$480.0M
Capital Expenditures	-$402.7M	-$326.9M	$291.8M
Free Cash Flow	$572.7M	$618.7M	$188.2M
YoY Change	47.87%	12.59%	-70.2%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
CY2012Q4	us-gaap	Accounts And Notes Receivable Net AccountsAndNotesReceivableNet	12100000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	538900000	USD
CY2011Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	434800000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	907300000	USD
CY2011Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	850600000	USD
CY2012Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	160600000	USD
CY2011Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	173500000	USD
CY2012Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	24800000	USD
CY2011Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	29000000	USD
CY2011Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	8699900000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	9025000000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	3700000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2600000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	2600000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax AccumulatedOtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	4900000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-28600000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-31800000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-34800000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	-21000000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-27500000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-39500000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-32800000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Defined Benefit Pension And Other Postretirement Plans Net Of Tax AccumulatedOtherComprehensiveIncomeLossDefinedBenefitPensionAndOtherPostretirementPlansNetOfTax	-26800000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-65500000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-59700000	USD
CY2009Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-45900000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-57900000	USD
CY2012Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	900000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4597600000	USD
CY2011Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4167700000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13400000	USD
CY2010	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	11200000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17800000	USD
CY2011Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	30500000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	24000000	USD
CY2012	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	9700000	USD
CY2010	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	10300000	USD
CY2011	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	8900000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	155500000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	144600000	USD
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2010	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	4100000	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2800000	shares
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	300000	USD
CY2010	us-gaap	Asset Impairment Charges AssetImpairmentCharges	2100000	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	16700000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1100000	USD
CY2011	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	600000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1600000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	6600000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1400000	USD
CY2011	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	3100000	USD
CY2011	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	-4600000	USD
CY2012	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	3800000	USD
CY2011Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	146400000	USD
CY2012Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	160400000	USD
CY2010Q4	us-gaap	Asset Retirement Obligations Noncurrent AssetRetirementObligationsNoncurrent	138800000	USD
CY2012Q4	us-gaap	Assets Assets	21844700000	USD
CY2011Q4	us-gaap	Assets Assets	20708300000	USD
CY2010Q4	us-gaap	Assets Assets	19913400000	USD
CY2012Q4	us-gaap	Assets Current AssetsCurrent	2352400000	USD
CY2011Q4	us-gaap	Assets Current AssetsCurrent	2269100000	USD
CY2011Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	26100000	USD
CY2012Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation AssetsOfDisposalGroupIncludingDiscontinuedOperation	26700000	USD
CY2012Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	26700000	USD
CY2011Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	26100000	USD
CY2012Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Noncurrent AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	0	USD
CY2011Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Noncurrent AssetsOfDisposalGroupIncludingDiscontinuedOperationNoncurrent	200000	USD
CY2012Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	111800000	USD
CY2011Q4	us-gaap	Available For Sale Securities AvailableForSaleSecurities	96000000	USD
CY2012Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	107900000	USD
CY2011Q4	us-gaap	Available For Sale Securities Amortized Cost AvailableForSaleSecuritiesAmortizedCost	93000000	USD
CY2012Q4	us-gaap	Available For Sale Securities Debt Maturities Within One Year Fair Value AvailableForSaleSecuritiesDebtMaturitiesWithinOneYearFairValue	2100000	USD
CY2011Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	96000000	USD
CY2012Q4	us-gaap	Available For Sale Securities Fair Value Disclosure AvailableForSaleSecuritiesFairValueDisclosure	111800000	USD
CY2011Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	300000	USD
CY2012Q4	us-gaap	Available For Sale Securities Gross Unrealized Losses1 AvailableForSaleSecuritiesGrossUnrealizedLosses1	100000	USD
CY2012Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	4000000	USD
CY2011Q4	us-gaap	Availableforsale Securities Gross Unrealized Gain AvailableforsaleSecuritiesGrossUnrealizedGain	3300000	USD
CY2011	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	98300000	USD
CY2010	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	106000000	USD
CY2012	us-gaap	Capital Expenditures Incurred But Not Yet Paid CapitalExpendituresIncurredButNotYetPaid	162600000	USD
CY2012Q3	us-gaap	Capital Lease Obligations CapitalLeaseObligations	72900000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due CapitalLeasesFutureMinimumPaymentsDue	258100000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due Current CapitalLeasesFutureMinimumPaymentsDueCurrent	24900000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	20900000	USD
CY2012	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	11200000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	20900000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	24500000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	25200000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	141700000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Interest Included In Payments CapitalLeasesFutureMinimumPaymentsInterestIncludedInPayments	84600000	USD
CY2012Q4	us-gaap	Capital Leases Future Minimum Payments Present Value Of Net Minimum Payments CapitalLeasesFutureMinimumPaymentsPresentValueOfNetMinimumPayments	5800000	USD
CY2011	us-gaap	Capital Leases Indemnification Agreements Payments CapitalLeasesIndemnificationAgreementsPayments	92700000	USD
CY2012	us-gaap	Capital Leases Indemnification Agreements Payments CapitalLeasesIndemnificationAgreementsPayments	182500000	USD
CY2012Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	46800000	USD
CY2011Q4	us-gaap	Capital Leases Lessee Balance Sheet Assets By Major Class Accumulated Deprecation CapitalLeasesLesseeBalanceSheetAssetsByMajorClassAccumulatedDeprecation	29800000	USD
CY2012Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	12373400000	USD
CY2011Q4	us-gaap	Capitalization Longterm Debt And Equity CapitalizationLongtermDebtAndEquity	11264400000	USD
CY2012	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	30600000	USD
CY2010	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	25900000	USD
CY2011	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	29000000	USD
CY2011Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	120800000	USD
CY2012Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	142600000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	36300000	USD
CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11500000	USD
CY2010Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	9200000	USD
CY2009Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	16400000	USD
CY2011	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-2500000	USD
CY2012	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-3300000	USD
CY2010	us-gaap	Cash Provided By Used In Investing Activities Discontinued Operations CashProvidedByUsedInInvestingActivitiesDiscontinuedOperations	-2100000	USD
CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	5700000	USD
CY2010	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-46800000	USD
CY2011	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	-38400000	USD
CY2011Q4	us-gaap	Commercial Paper CommercialPaper	402700000	USD
CY2012Q4	us-gaap	Commercial Paper CommercialPaper	499600000	USD
CY2011Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
CY2012Q4	us-gaap	Commodity Contract Asset Noncurrent CommodityContractAssetNoncurrent	53300000	USD
CY2012	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.94
CY2011	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.92
CY2010	us-gaap	Common Stock Dividends Per Share Cash Paid CommonStockDividendsPerShareCashPaid	0.92
CY2012	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.94
CY2011	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.92
CY2010	us-gaap	Common Stock Dividends Per Share Declared CommonStockDividendsPerShareDeclared	0.92
CY2012Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2011Q4	us-gaap	Common Stock Par Or Stated Value Per Share CommonStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2011Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
CY2012Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	310280867	shares
CY2011Q4	us-gaap	Common Stock Shares Issued CommonStockSharesIssued	281853571	shares
CY2011Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	281853571	shares
CY2012Q4	us-gaap	Common Stock Shares Outstanding CommonStockSharesOutstanding	310280867	shares
CY2011Q4	us-gaap	Common Stock Value CommonStockValue	2800000	USD
CY2012Q4	us-gaap	Common Stock Value CommonStockValue	3100000	USD
CY2010	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	270600000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	410300000	USD
CY2011	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	297300000	USD
CY2011	us-gaap	Cost Of Revenue CostOfRevenue	2545800000	USD
CY2012	us-gaap	Cost Of Revenue CostOfRevenue	1541500000	USD
CY2010	us-gaap	Cost Of Revenue CostOfRevenue	2963800000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-94800000	USD
CY2010	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-66200000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-19100000	USD
CY2010	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-64000000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-21200000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-89100000	USD
CY2010	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	2200000	USD
CY2011	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-2100000	USD
CY2012Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	269600000	USD
CY2011Q4	us-gaap	Customer Deposits Current CustomerDepositsCurrent	313600000	USD
CY2012Q4	us-gaap	Debt And Capital Lease Obligations DebtAndCapitalLeaseObligations	7100000000	USD
CY2012Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	7326300000	USD
CY2011Q4	us-gaap	Debt Instrument Carrying Amount DebtInstrumentCarryingAmount	6594400000	USD
CY2012	us-gaap	Debt Instrument Convertible Conversion Ratio DebtInstrumentConvertibleConversionRatio	59.3
CY2011	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	151800000	USD
CY2010	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	182300000	USD
CY2012	us-gaap	Deferred Federal Income Tax Expense Benefit DeferredFederalIncomeTaxExpenseBenefit	289900000	USD
CY2011Q4	us-gaap	Deferred Gas Cost DeferredGasCost	20700000	USD
CY2012Q4	us-gaap	Deferred Gas Cost DeferredGasCost	45000000	USD
CY2011	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	183200000	USD
CY2012	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	308700000	USD
CY2010	us-gaap	Deferred Income Tax Expense Benefit DeferredIncomeTaxExpenseBenefit	199700000	USD
CY2010	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	193800000	USD
CY2012	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	304600000	USD
CY2011	us-gaap	Deferred Income Taxes And Tax Credits DeferredIncomeTaxesAndTaxCredits	178400000	USD
CY2012	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-4100000	USD
CY2010	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-5900000	USD
CY2011	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-4800000	USD
CY2012Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	42800000	USD
CY2011Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	9700000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	31400000	USD
CY2010	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	17400000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	18800000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	-1447700000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	-1418100000	USD
CY2010Q1	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	6200000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	2734200000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	2411100000	USD
CY2010Q4	us-gaap	Deferred Tax Assets Liabilities Net DeferredTaxAssetsLiabilitiesNet	2230200000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	-130800000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Liabilities Net Current DeferredTaxAssetsLiabilitiesNetCurrent	-219100000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	2734200000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Net DeferredTaxAssetsNet	2411100000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	-218900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	-250300000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-55900000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-56900000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	3000000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	-369800000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	-353600000	USD
CY2013Q1	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	36300000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	-55400000	USD
CY2011Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	-45700000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	4181900000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	3829200000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2953300000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2541900000	USD
CY2011Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	1000000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Other Comprehensive Income DeferredTaxLiabilitiesOtherComprehensiveIncome	-3800000	USD
CY2012Q4	us-gaap	Deferred Tax Liability Not Recognized Amount Of Unrecognized Deferred Tax Liability DeferredTaxLiabilityNotRecognizedAmountOfUnrecognizedDeferredTaxLiability	26200000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	31500000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Assets For Plan Benefits Noncurrent DefinedBenefitPlanAssetsForPlanBenefitsNoncurrent	0	USD
CY2012	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0830
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	-56700000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	-3600000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	67900000	USD
CY2012	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	4500000	USD
CY2011Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2417600000	USD
CY2012Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2538600000	USD
CY2012	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	27300000	USD
CY2010	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	19700000	USD
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	25900000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	535700000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	561900000	USD
CY2010	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	594800000	USD
CY2003Q3	us-gaap	Derivative Average Basis Spread On Variable Rate DerivativeAverageBasisSpreadOnVariableRate	0.0078
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	348500000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	148200000	USD
CY2011Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	306700000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	115500000	USD
CY2003Q3	us-gaap	Derivative Fixed Interest Rate DerivativeFixedInterestRate	0.0540
CY2011Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	137200000	USD
CY2012Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	92200000	USD
CY2012Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	95200000	USD
CY2011Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	167800000	USD
CY2011Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	188700000	USD
CY2012Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	56000000	USD
CY2012	us-gaap	Derivative Instruments Loss Reclassified From Accumulated Oci Into Income Effective Portion DerivativeInstrumentsLossReclassifiedFromAccumulatedOCIIntoIncomeEffectivePortion	200000	USD
CY2011Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	138900000	USD
CY2012Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	20300000	USD
CY2012	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2011	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2010	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	100000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	8700000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	7400000	USD
CY2010	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	9500000	USD
CY2011	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	3100000	USD
CY2010	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	3800000	USD
CY2012	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	3200000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Other Assets DisposalGroupIncludingDiscontinuedOperationOtherAssets	5200000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Other Assets DisposalGroupIncludingDiscontinuedOperationOtherAssets	5200000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	400000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	3900000	USD
CY2011Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	20900000	USD
CY2012Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	21500000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	41500000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	44400000	USD
CY2010	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	44100000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-273500000	USD
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-258200000	USD
CY2010	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-255700000	USD
CY2012Q4	us-gaap	Dividends Common Stock Stock DividendsCommonStockStock	0.24	USD
CY2012Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	785400000	USD
CY2011Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	288600000	USD
CY2011Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	602600000	USD
CY2012Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	833100000	USD
CY2012Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	3996200000	USD
CY2011Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	3996200000	USD
CY2012	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.43
CY2011	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.06
CY2010	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.02
CY2011Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.12
CY2011Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.14
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.68
CY2011Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.05
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2011Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.75
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.25
CY2010	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.01
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.03
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.39
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2011Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.14
CY2011Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.12
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2011Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.73
CY2011Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.04
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.348
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.344
CY2010	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.319
CY2012	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	-0.009
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	-0.040
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.008
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.013
CY2010	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2011	us-gaap	Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate	0.350
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.007
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.005
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.007
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.004
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.003
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.006
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Amortization EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAmortization	-0.007
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Amortization EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAmortization	-0.011
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Amortization EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAmortization	-0.015
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	-0.018
CY2010	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	0.002
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.042
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.025
CY2010	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.030
CY2012	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	1507700000	USD
CY2011	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	1427700000	USD
CY2010	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	1379300000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	8800000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	27500000	USD
CY2012Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	17600000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4700000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6100000	USD
CY2010	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	3700000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions	200000	USD
CY2012Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	71700000	USD
CY2011Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	50900000	USD
CY2011Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	427600000	USD
CY2012Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	326600000	USD
CY2012	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	34900000	USD
CY2011Q4	us-gaap	Environmental Remediation Expense EnvironmentalRemediationExpense	35500000	USD
CY2010	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	12900000	USD
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	18800000	USD
CY2011Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	21900000	USD
CY2012Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	13200000	USD
CY2012	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P40Y
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	286600000	USD
CY2011Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	297600000	USD
CY2012	us-gaap	Forward Contract Indexed To Issuers Equity Shares ForwardContractIndexedToIssuersEquityShares	24265000	shares
CY2011	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-100000	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4100000	USD
CY2010	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	100000	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-53900000	USD
CY2010	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-96700000	USD
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2011	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	2917900000	USD
CY2010	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	3094000000	USD
CY2012	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	1959800000	USD
CY2011Q4	us-gaap	Goodwill Goodwill	3677300000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	3677300000	USD
CY2012Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	7966100000	USD
CY2011	us-gaap	Gross Profit GrossProfit	3428900000	USD
CY2012	us-gaap	Gross Profit GrossProfit	3519700000	USD
CY2010	us-gaap	Gross Profit GrossProfit	3407400000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	410600000	USD
CY2010	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	276800000	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	294800000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	192500000	USD
CY2011Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	33400000	USD
CY2011Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	15600000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	132000000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	68500000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	17600000	USD
CY2011Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	38400000	USD
CY2011Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	207400000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	452000000	USD
CY2010	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	406600000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	626100000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.25
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.68
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.05
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.12
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.42
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.06
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.13
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.75
CY2011Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.04
CY2011Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.13
CY2011Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.73
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.06
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.66
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.42
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.23
CY2011Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.12
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	4300000	USD
CY2010	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	5700000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	5500000	USD
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2100000	USD
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1800000	USD
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1700000	USD
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2000000	USD
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1300000	USD
CY2011Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-900000	USD
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	900000	USD
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	900000	USD
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2011Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2011Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2011Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2011Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2011Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2010	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	15000000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	14600000	USD
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	32200000	USD
CY2010	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	129800000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	215500000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	157200000	USD
CY2011	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	3100000	USD
CY2010	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	700000	USD
CY2012	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	3400000	USD
CY2010	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	2900000	USD
CY2010	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	142300000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	158200000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	219100000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1900000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1800000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	2500000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	-5900000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	-4800000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	-4100000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-8200000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-6100000	USD
CY2010	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-16200000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4700000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-6100000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	19300000	USD
CY2010	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	11900000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	15900000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	9300000	USD
CY2010	us-gaap	Income Taxes Paid IncomeTaxesPaid	68900000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	8200000	USD
CY2012Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	130900000	USD
CY2011Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	900000	USD
CY2010	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	37700000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	57300000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-154800000	USD
CY2010	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	243600000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-219600000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	51300000	USD
CY2010	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	-25000000	USD
CY2012	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	-44000000	USD
CY2011	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	-4500000	USD
CY2011	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-127500000	USD
CY2010	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	243000000	USD
CY2012	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	51100000	USD
CY2010	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	-2600000	USD
CY2011	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	-2300000	USD
CY2012	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	4900000	USD
CY2011	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-92700000	USD
CY2012	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	123000000	USD
CY2010	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-146600000	USD
CY2011Q2	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	6800000	USD
CY2010Q3	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	-15200000	USD
CY2010	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-51500000	USD
CY2011	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-98100000	USD
CY2012	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	130000000	USD
CY2011	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-2500000	USD
CY2012	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	21800000	USD
CY2010	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-10700000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	141700000	USD
CY2011	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	1017000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	557000	shares
CY2010	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-103300000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-62400000	USD
CY2011	us-gaap	Increase Decrease In Long Term Receivables Current IncreaseDecreaseInLongTermReceivablesCurrent	3300000	USD
CY2010	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-13200000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-14100000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	82000000	USD
CY2010	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	-116900000	USD
CY2012	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	9900000	USD
CY2011	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	2300000	USD
CY2012	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	51700000	USD
CY2010	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-164300000	USD
CY2011	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	322900000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-42300000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-114200000	USD
CY2010	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	28200000	USD
CY2012	us-gaap	Increase Decrease In Risk Management Assets And Liabilities IncreaseDecreaseInRiskManagementAssetsAndLiabilities	18500000	USD
CY2011	us-gaap	Increase Decrease In Risk Management Assets And Liabilities IncreaseDecreaseInRiskManagementAssetsAndLiabilities	-38100000	USD
CY2010	us-gaap	Increase Decrease In Risk Management Assets And Liabilities IncreaseDecreaseInRiskManagementAssetsAndLiabilities	5500000	USD
CY2010	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	910000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	684000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	7229000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	6684000	shares
CY2012	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	544000	shares
CY2011	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	339000	shares
CY2010	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	697000	shares
CY2011Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	297600000	USD
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	286600000	USD
CY2011	us-gaap	Interest Expense InterestExpense	376800000	USD
CY2010	us-gaap	Interest Expense InterestExpense	392300000	USD
CY2012	us-gaap	Interest Expense InterestExpense	418300000	USD
CY2010	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	390700000	USD
CY2012	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	398200000	USD
CY2011	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	362900000	USD
CY2011	us-gaap	Interest Expense Other InterestExpenseOther	-7400000	USD
CY2010	us-gaap	Interest Expense Other InterestExpenseOther	-12400000	USD
CY2012	us-gaap	Interest Expense Other InterestExpenseOther	9500000	USD
CY2010	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	1900000	USD
CY2012	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	6700000	USD
CY2011	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	13500000	USD
CY2011	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	4400000	USD
CY2012	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	5200000	USD
CY2010	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	6300000	USD
CY2011Q4	us-gaap	Interest Payable Current InterestPayableCurrent	111900000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	133700000	USD
CY2012Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	97400000	USD
CY2011Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	86600000	USD
CY2012Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	437700000	USD
CY2011Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	355800000	USD
CY2012Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	243300000	USD
CY2011Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	204700000	USD
CY2011Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	150000000	USD
CY2012Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	48400000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	21844700000	USD
CY2011Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	20708300000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3301600000	USD
CY2011Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3646400000	USD
CY2012Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	6169700000	USD
CY2011Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	5797500000	USD
CY2011Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	400000	USD
CY2012Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	3900000	USD
CY2011	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-40900000	USD
CY2010	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	210700000	USD
CY2011Q4	us-gaap	Net Income Loss NetIncomeLoss	14700000	USD
CY2011Q3	us-gaap	Net Income Loss NetIncomeLoss	34700000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	134000000	USD
CY2011Q2	us-gaap	Net Income Loss NetIncomeLoss	40200000	USD
CY2012Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	3900000	USD
CY2011Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	400000	USD
CY2012Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	44000000	USD
CY2011Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	725000000	USD
CY2012Q4	us-gaap	Long Term Debt LongTermDebt	7367600000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	6267100000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	6819100000	USD
CY2011Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	327300000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	507200000	USD
CY2012Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	8389000000	USD
CY2011Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	7369400000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	4768800000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	507200000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	603000000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	434400000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	495000000	USD
CY2012Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	559200000	USD
CY2012Q4	us-gaap	Longterm Debt Percentage Bearing Variable Interest Amount LongtermDebtPercentageBearingVariableInterestAmount	500000000	USD
CY2012	us-gaap	Loss Contingency Loss In Period LossContingencyLossInPeriod	1200000	USD
CY2012Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	45700000	USD
CY2011Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	158200000	USD
CY2012Q4	us-gaap	Minority Interest Ownership Percentage By Parent MinorityInterestOwnershipPercentageByParent	0.475
CY2012	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	1462400000	USD
CY2011	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	1354600000	USD
CY2010	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	1261400000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	16900000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	43200000	USD
CY2010	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	41700000	USD
CY2012	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	7900000	USD
CY2010	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-48900000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	174500000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	281400000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1149300000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-943300000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1425200000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1421900000	USD
CY2010	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-941200000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1146800000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	725400000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1275500000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	870200000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	19300000	USD
CY2011Q1	us-gaap	Net Income Loss NetIncomeLoss	209500000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	193400000	USD
CY2012	us-gaap	Operating Expenses OperatingExpenses	2509200000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	1042700000	USD
CY2011Q4	us-gaap	Other Assets Current OtherAssetsCurrent	261800000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	357200000	USD
CY2011Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6304200000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6138700000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	908600000	USD
CY2010	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	772200000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1264300000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	299100000	USD
CY2010	us-gaap	Net Income Loss NetIncomeLoss	282600000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	416100000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	890100000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	306500000	USD
CY2011Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	403600000	USD
CY2010	us-gaap	Operating Income Loss OperatingIncomeLoss	891800000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	397700000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	133200000	USD
CY2011Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	182200000	USD
CY2011Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	142700000	USD
CY2011Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	161600000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	205300000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	172900000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	43400000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	15700000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	22500000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	28500000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	39100000	USD
CY2012Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	23700000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	50900000	USD
CY2010	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	56700000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	52900000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	69400000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-416600000	USD
CY2010	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-485200000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-438100000	USD
CY2005Q3	us-gaap	Notional Amount Of Interest Rate Derivatives NotionalAmountOfInterestRateDerivatives	900000000	USD
CY2003Q3	us-gaap	Notional Amount Of Interest Rate Derivatives NotionalAmountOfInterestRateDerivatives	500000000	USD
CY2010	us-gaap	Operating Expenses OperatingExpenses	2530600000	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	2553400000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1100000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	1200000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2300000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	3200000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	-13800000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	3000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	700000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	-6000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Finalization Of Pension And Non Pension Postretirement Plan Valuation Net Of Tax OtherComprehensiveIncomeLossFinalizationOfPensionAndNonPensionPostretirementPlanValuationNetOfTax	-6700000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-12000000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5800000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1800000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5800000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-12000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1800000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	6700000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	6000000	USD
CY2010	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-700000	USD
CY2011Q4	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	78900000	USD
CY2012Q4	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	84100000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	309700000	USD
CY2011Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	301000000	USD
CY2011Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	244700000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	226200000	USD
CY2012Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	194400000	USD
CY2011Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	150900000	USD
CY2011	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-11800000	USD
CY2010	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-2500000	USD
CY2012	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-3500000	USD
CY2010	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	3800000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7400000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1700000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	274500000	USD
CY2012	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	131300000	USD
CY2010	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	636500000	USD
CY2010	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	53100000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	49000000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	69400000	USD
CY2010	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	1500000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3100000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	10000000	USD
CY2010	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	255600000	USD
CY2011	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	257800000	USD
CY2012	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	273200000	USD
CY2012	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1498800000	USD
CY2011	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1122700000	USD
CY2010	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	801300000	USD
CY2011	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	9400000	USD
CY2010	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	500000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	1107300000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	953800000	USD
CY2011Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	-466900000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	-461800000	USD
CY2012Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2012Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2011	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	0	USD
CY2012	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	6500000	USD
CY2010	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	5000000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	24400000	USD
CY2010	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	14400000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	383500000	USD
CY2010	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	244600000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	991400000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	890000000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3400000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-62100000	USD
CY2010	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-93000000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-23100000	USD
CY2010	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	1279500000	USD
CY2012	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-582200000	USD
CY2012	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	25600000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	20479100000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	21940900000	USD
CY2011Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	11779200000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12915900000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	10600000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	2400000	USD
CY2010	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	6100000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	8651900000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	8986400000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	12915900000	USD
CY2012Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1787000000	USD
CY2011Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	112000000	USD
CY2012Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	171600000	USD
CY2011Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1663900000	USD
CY2012Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1593300000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	11779200000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	21642300000	USD
CY2011Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	20299700000	USD
CY2010	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	20400000	USD
CY2011	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	-2200000	USD
CY2012	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	8300000	USD
CY2012Q4	us-gaap	Regulatory Assets RegulatoryAssets	2232200000	USD
CY2011Q4	us-gaap	Regulatory Assets RegulatoryAssets	2168600000	USD
CY2011Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	169700000	USD
CY2012Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	162800000	USD
CY2011Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1978200000	USD
CY2012Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2024400000	USD
CY2011Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1824800000	USD
CY2012	us-gaap	Remaining Recovery Period Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided1 RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1	P43Y
CY2010	us-gaap	Repayments Of Accounts Receivable Securitization RepaymentsOfAccountsReceivableSecuritization	-6300000	USD
CY2012	us-gaap	Repayments Of Accounts Receivable Securitization RepaymentsOfAccountsReceivableSecuritization	-3200000	USD
CY2011	us-gaap	Repayments Of Accounts Receivable Securitization RepaymentsOfAccountsReceivableSecuritization	-3800000	USD
CY2010	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	977700000	USD
CY2012	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	331600000	USD
CY2011	us-gaap	Repayments Of Long Term Debt RepaymentsOfLongTermDebt	286900000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	46800000	USD
CY2011Q4	us-gaap	Restricted Cash And Cash Equivalents At Carrying Value RestrictedCashAndCashEquivalentsAtCarryingValue	160600000	USD
CY2011Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	917000000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1059600000	USD
CY2012	us-gaap	Revenue Recognition Accounting Policy Gross And Net Revenue Disclosure RevenueRecognitionAccountingPolicyGrossAndNetRevenueDisclosure	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:12px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">L.        Revenue Recognition.</font><font style="font-family:inherit;font-size:10pt;">    Revenue is recorded as products and services are delivered. Utility revenues are billed to customers monthly on a cycle basis. Revenues are recorded on the accrual basis and include estimates for electricity and gas delivered but not billed. Cash received in advance from sales of commodities to be delivered in the future is recorded as deferred revenue and recognized as income upon delivery of the commodities. For shorter term transportation and storage service revenues, cash is received at inception of the service period resulting in the recording of deferred revenues that are recognized in revenues over the period the services are provided.</font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">Deferred revenue also includes a gain on conveyance related to a pooling of assets (production rights) in a joint undertaking of NEVCO intended to find, develop, or produce oil or gas from a particular property or group of properties. NiSource has a working interest in the joint venture. The gain was deferred as NiSource has a substantial obligation for future performance. NiSource will proportionately recognize the gain on conveyance into earnings as the obligation is satisfied. </font></div><div style="line-height:120%;font-size:8pt;"><font style="font-family:inherit;font-size:8pt;"><br clear="none"/></font></div></div>
CY2011	us-gaap	Sales Revenue Net SalesRevenueNet	5974700000	USD
CY2012	us-gaap	Sales Revenue Net SalesRevenueNet	5061200000	USD
CY2010	us-gaap	Sales Revenue Net SalesRevenueNet	6371200000	USD
CY2011Q1	us-gaap	Sales Revenue Net SalesRevenueNet	2220800000	USD
CY2012Q1	us-gaap	Sales Revenue Net SalesRevenueNet	1648900000	USD
CY2011Q4	us-gaap	Sales Revenue Net SalesRevenueNet	1479100000	USD
CY2011Q2	us-gaap	Sales Revenue Net SalesRevenueNet	1217500000	USD
CY2012Q4	us-gaap	Sales Revenue Net SalesRevenueNet	1410300000	USD
CY2012Q3	us-gaap	Sales Revenue Net SalesRevenueNet	962900000	USD
CY2012Q2	us-gaap	Sales Revenue Net SalesRevenueNet	1039100000	USD
CY2011Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1057300000	USD
CY2011Q4	us-gaap	Shares Issued SharesIssued	281854000000	shares
CY2010Q4	us-gaap	Shares Issued SharesIssued	278855000000	shares
CY2012Q4	us-gaap	Shares Issued SharesIssued	310281000000	shares
CY2009Q4	us-gaap	Shares Issued SharesIssued	276638000000	shares
CY2011Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	1359400000	USD
CY2012Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	776900000	USD
CY2012Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	1264200000	USD
CY2012Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	225300000	USD
CY2012Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	327600000	USD
CY2012	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	5061200000	USD
CY2010	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	6371200000	USD
CY2011	us-gaap	Segment Reporting Information Revenue SegmentReportingInformationRevenue	5974700000	USD
CY2010	us-gaap	Share Based Compensation ShareBasedCompensation	30900000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	45000000	USD
CY2010Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	107400000	USD
CY2012Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	20500000	USD
CY2011Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	80900000	USD
CY2011	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	439000000	shares
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	39200000	USD
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	7359009	shares
CY2010Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	8000000	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	1558436	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	22.21
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	-6750	shares
CY2012	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	2818715	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1558436	shares
CY2011Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.09
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.21
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	21.93
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	23.73
CY2012	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2012Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	4200000	USD
CY2012	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y6M
CY2010	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	563000000	shares
CY2012	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	340000000	shares
CY2011	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	67000000	shares
CY2012	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	73000000	shares
CY2010	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	62000000	shares
CY2012	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	2692000000	shares
CY2010	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	191000000	shares
CY2011	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	1064000000	shares
CY2012	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	-1253529	shares
CY2010	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	0	shares
CY2012	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	8300000	USD
CY2010	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	8900000	USD
CY2011	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	8900000	USD
CY2012	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1800000	USD
CY2010	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1100000	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1300000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	300000	USD
CY2012	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	44600000	USD
CY2011	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	21400000	USD
CY2010	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	12100000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	4997300000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	5554300000	USD
CY2009Q4	us-gaap	Stockholders Equity StockholdersEquity	4837800000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	4897500000	USD
CY2012	us-gaap	Tax Credit Carryforward Expiration Date TaxCreditCarryforwardExpirationDate	2032-12-31
CY2012	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	288300000	USD
CY2011	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	294500000	USD
CY2010	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	287200000	USD
CY2011Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	220900000	USD
CY2012Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	235500000	USD
CY2012Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	233300000	USD
CY2011Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	231700000	USD
CY2010	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	-97000000	shares
CY2011	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	-165000000	shares
CY2012	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	-439000000	shares
CY2011Q4	us-gaap	Treasury Stock Value TreasuryStockValue	30500000	USD
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	40500000	USD
CY2012	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	-10000000	USD
CY2011	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	-3100000	USD
CY2010	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	-1500000	USD
CY2011Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	281500000	USD
CY2012Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	285700000	USD
CY2011	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	1400000	USD
CY2012	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	1000000	USD
CY2010	us-gaap	Unrealized Gain Loss On Derivatives UnrealizedGainLossOnDerivatives	15400000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	105300000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	129200000	USD
CY2009Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	117700000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28500000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-8200000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-29600000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-85400000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Income Tax Penalties Accrued UnrecognizedTaxBenefitsIncomeTaxPenaltiesAccrued	0	USD
CY2012	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	200000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	100000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	-100000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	8400000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	18500000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5700000	USD
CY2010	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1200000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	200000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	700000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	900000	USD
CY2009	us-gaap	Unrecognized Tax Benefits Period Increase Decrease UnrecognizedTaxBenefitsPeriodIncreaseDecrease	114400000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Resulting In Net Operating Loss Carryforward UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward	-13300000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits Resulting In Net Operating Loss Carryforward UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward	-17200000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Resulting In Net Operating Loss Carryforward UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward	-10200000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2400000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	3900000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2200000	USD
CY2012	us-gaap	Use Of Estimates UseOfEstimates	<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;padding-top:10px;text-align:justify;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-weight:bold;">B.       Use of Estimates.</font><font style="font-family:inherit;font-size:10pt;">    The preparation of financial statements in conformity with GAAP in the United States requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.</font></div></div>
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1706400000	USD
CY2012	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1662800000	USD
CY2010	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1646600000	USD
CY2011Q4	us-gaap	Weighted Average Cost Inventory Amount WeightedAverageCostInventoryAmount	277600000	USD
CY2012Q4	us-gaap	Weighted Average Cost Inventory Amount WeightedAverageCostInventoryAmount	278200000	USD
CY2011Q4	ni	Accelerated Depreciation And Other Property Differences AcceleratedDepreciationAndOtherPropertyDifferences	2943000000	USD
CY2012Q4	ni	Accelerated Depreciation And Other Property Differences AcceleratedDepreciationAndOtherPropertyDifferences	3306600000	USD
CY2011	ni	Accretion Recorded As Regulatory Asset Or Liability AccretionRecordedAsRegulatoryAssetOrLiability	8100000	USD
CY2012	ni	Accretion Recorded As Regulatory Asset Or Liability AccretionRecordedAsRegulatoryAssetOrLiability	8900000	USD
CY2012Q4	ni	Accrued Liability For Postretirement And Postemployment Benefits Current AccruedLiabilityForPostretirementAndPostemploymentBenefitsCurrent	6100000	USD
CY2011Q4	ni	Accrued Liability For Postretirement And Postemployment Benefits Current AccruedLiabilityForPostretirementAndPostemploymentBenefitsCurrent	26600000	USD
CY2011	ni	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	-3100000	USD
CY2010	ni	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	-2700000	USD
CY2012	ni	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	-7100000	USD
CY2012	ni	Annual Capital Lease Payments Number Of Years AnnualCapitalLeasePaymentsNumberOfYears	P10Y
CY2012	ni	Asset Sale Covenant Percentage Of Consolidated Total Assets AssetSaleCovenantPercentageOfConsolidatedTotalAssets	0.10
CY2012	ni	Cash From Financing Activities Related To Change In Short Term Borrowings Due To Securitization Transactions CashFromFinancingActivitiesRelatedToChangeInShortTermBorrowingsDueToSecuritizationTransactions	1600000	USD
CY2011	ni	Cash From Financing Activities Related To Change In Short Term Borrowings Due To Securitization Transactions CashFromFinancingActivitiesRelatedToChangeInShortTermBorrowingsDueToSecuritizationTransactions	43300000	USD
CY2012Q3	ni	Cash Received Through Forward Contract CashReceivedThroughForwardContract	339100000	USD
CY2011	ni	Change In Equity Investments Related To Unrealized Losses Gains ChangeInEquityInvestmentsRelatedToUnrealizedLossesGains	0	USD
CY2012	ni	Change In Equity Investments Related To Unrealized Losses Gains ChangeInEquityInvestmentsRelatedToUnrealizedLossesGains	0	USD
CY2010	ni	Change In Equity Investments Related To Unrealized Losses Gains ChangeInEquityInvestmentsRelatedToUnrealizedLossesGains	-24100000	USD
CY2012Q4	ni	Change In Tax Effects Of Income Tax Related Regulatory Assets And Liabilities ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities	23500000	USD
CY2011Q4	ni	Change In Tax Effects Of Income Tax Related Regulatory Assets And Liabilities ChangeInTaxEffectsOfIncomeTaxRelatedRegulatoryAssetsAndLiabilities	3200000	USD
CY2010	ni	Change In Unrecognized Pension Benefit And Opeb Costs Tax ChangeInUnrecognizedPensionBenefitAndOpebCostsTax	400000	USD
CY2012	ni	Change In Unrecognized Pension Benefit And Opeb Costs Tax ChangeInUnrecognizedPensionBenefitAndOpebCostsTax	4200000	USD
CY2011	ni	Change In Unrecognized Pension Benefit And Opeb Costs Tax ChangeInUnrecognizedPensionBenefitAndOpebCostsTax	3700000	USD
CY2012	ni	Columbia Transmission Customer Settlement Depreciation Impact ColumbiaTransmissionCustomerSettlementDepreciationImpact	33400000	USD
CY2012	ni	Columbia Transmission Customer Settlement Gross Revenue Impact ColumbiaTransmissionCustomerSettlementGrossRevenueImpact	81700000	USD
CY2010	ni	Contributions To Equity Investees ContributionsToEquityInvestees	87900000	USD
CY2011	ni	Contributions To Equity Investees ContributionsToEquityInvestees	6400000	USD
CY2012	ni	Contributions To Equity Investees ContributionsToEquityInvestees	20400000	USD
CY2012Q4	ni	Cost Of Removal CostOfRemoval	-523400000	USD
CY2011Q4	ni	Cost Of Removal CostOfRemoval	-557900000	USD
CY2012Q4	ni	Cross Default Provision On Default Relating To Any Indebtedness CrossDefaultProvisionOnDefaultRelatingToAnyIndebtedness	50000000	USD
CY2012Q4	ni	Current Deferred Taxes Related To Federal Net Operating Loss CurrentDeferredTaxesRelatedToFederalNetOperatingLoss	162800000	USD
CY2003Q3	ni	Date Of Right To Cancel Swaps DateOfRightToCancelSwaps	2013-07-15
CY2010Q4	ni	Debt Instrument Tendered DebtInstrumentTendered	273100000	USD
CY2010Q4	ni	Debt Instrument Tendered DebtInstrumentTendered	272900000	USD
CY2012Q4	ni	Deferred Charges And Other DeferredChargesAndOther	94400000	USD
CY2011Q4	ni	Deferred Charges And Other DeferredChargesAndOther	130900000	USD
CY2012Q4	ni	Deferred Gas Cost Regulatory Asset Not Earning Return On Investment DeferredGasCostRegulatoryAssetNotEarningReturnOnInvestment	1240100000	USD
CY2011Q4	ni	Deferred Gas Revenue DeferredGasRevenue	48900000	USD
CY2012Q4	ni	Deferred Gas Revenue DeferredGasRevenue	22100000	USD
CY2011Q4	ni	Deferred Investment Tax Credits And Other Regulatory Liabilities DeferredInvestmentTaxCreditsAndOtherRegulatoryLiabilities	-73900000	USD
CY2012Q4	ni	Deferred Investment Tax Credits And Other Regulatory Liabilities DeferredInvestmentTaxCreditsAndOtherRegulatoryLiabilities	-191500000	USD
CY2011Q4	ni	Deferred Taxes Transferred To Taxes Accrued And Other Charges DeferredTaxesTransferredToTaxesAccruedAndOtherCharges	-6500000	USD
CY2012Q4	ni	Deferred Taxes Transferred To Taxes Accrued And Other Charges DeferredTaxesTransferredToTaxesAccruedAndOtherCharges	-5300000	USD
CY2011	ni	Defined Benefit Plan Periodic Benefit Cost Capitalized DefinedBenefitPlanPeriodicBenefitCostCapitalized	58300000	USD
CY2012	ni	Defined Benefit Plan Periodic Benefit Cost Capitalized DefinedBenefitPlanPeriodicBenefitCostCapitalized	25100000	USD
CY2003Q3	ni	Derivative Number Of Counterparties In Swap Agreement DerivativeNumberOfCounterpartiesInSwapAgreement	4
CY2005Q3	ni	Derivative Number Of Counterparties In Swap Agreement Settled DerivativeNumberOfCounterpartiesInSwapAgreementSettled	6
CY2011	ni	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	7100000	USD
CY2010	ni	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	8500000	USD
CY2012	ni	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	7800000	USD
CY2011	ni	Distribution Of Earnings Within Partners DistributionOfEarningsWithinPartners	4500000	USD
CY2012	ni	Distribution Of Earnings Within Partners DistributionOfEarningsWithinPartners	3500000	USD
CY2011	ni	Distributions From Equity Investees DistributionsFromEquityInvestees	0	USD
CY2010	ni	Distributions From Equity Investees DistributionsFromEquityInvestees	23800000	USD
CY2012	ni	Distributions From Equity Investees DistributionsFromEquityInvestees	0	USD
CY2008Q3	ni	Each Wind Power Purchase Agreement Capacity EachWindPowerPurchaseAgreementCapacity	50	MW
CY2012	ni	Employee Service Share Based Compensation Nonvested Awards Weighted Average Remaining Requisite Service Period EmployeeServiceShareBasedCompensationNonvestedAwardsWeightedAverageRemainingRequisiteServicePeriod	P1Y11M
CY2012Q4	ni	Environmental Liabilities EnvironmentalLiabilities	-49000000	USD
CY2011Q4	ni	Environmental Liabilities EnvironmentalLiabilities	-63600000	USD
CY2011Q4	ni	Exchange Gas Payable ExchangeGasPayable	168200000	USD
CY2012Q4	ni	Exchange Gas Payable ExchangeGasPayable	146200000	USD
CY2012Q4	ni	Exchange Gas Receivable ExchangeGasReceivable	51500000	USD
CY2011Q4	ni	Exchange Gas Receivable ExchangeGasReceivable	64900000	USD
CY2011Q4	ni	Expected Benefits To Be Realized ExpectedBenefitsToBeRealized	35800000	USD
CY2012Q4	ni	Expected Benefits To Be Realized ExpectedBenefitsToBeRealized	39400000	USD
CY2012Q4	ni	Expenses Recovered As Components Of Cost Of Service And Regulatory Orders ExpensesRecoveredAsComponentsOfCostOfServiceAndRegulatoryOrders	2086000000	USD
CY2012Q4	ni	Fair Value Assets Measured On Recurring Basis FairValueAssetsMeasuredOnRecurringBasis	260000000	USD
CY2011Q4	ni	Fair Value Assets Measured On Recurring Basis FairValueAssetsMeasuredOnRecurringBasis	444500000	USD
CY2012Q4	ni	Fair Value Liabilities Measured On Recurring Basis FairValueLiabilitiesMeasuredOnRecurringBasis	115500000	USD
CY2011Q4	ni	Fair Value Liabilities Measured On Recurring Basis FairValueLiabilitiesMeasuredOnRecurringBasis	306700000	USD
CY2009Q4	ni	Federal And State Income Tax Receivables FederalAndStateIncomeTaxReceivables	295700000	USD
	ni	Goodwill Discount Rate GoodwillDiscountRate	0.0560
CY2012	ni	Income From Unconsolidated Affiliates IncomeFromUnconsolidatedAffiliates	30900000	USD
CY2011	ni	Income From Unconsolidated Affiliates IncomeFromUnconsolidatedAffiliates	13700000	USD
CY2011	ni	Income Tax Rate Change Period IncomeTaxRateChangePeriod	P4Y
CY2012Q4	ni	Income Tax Receivable Recognized From Remeasurement IncomeTaxReceivableRecognizedFromRemeasurement	85700000	USD
CY2012Q4	ni	Guarantee Obligations Maximum Exposure Thereafter GuaranteeObligationsMaximumExposureThereafter	4632300000	USD
CY2012Q4	ni	Guarantee Obligations Maximum Exposure Year Five GuaranteeObligationsMaximumExposureYearFive	507000000	USD
CY2012Q4	ni	Guarantee Obligations Maximum Exposure Year Four GuaranteeObligationsMaximumExposureYearFour	291500000	USD
CY2012Q4	ni	Guarantee Obligations Maximum Exposure Year One GuaranteeObligationsMaximumExposureYearOne	1477700000	USD
CY2012Q4	ni	Guarantee Obligations Maximum Exposure Year Three GuaranteeObligationsMaximumExposureYearThree	524200000	USD
CY2012Q4	ni	Guarantee Obligations Maximum Exposure Year Two GuaranteeObligationsMaximumExposureYearTwo	533400000	USD
CY2010	ni	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	2000000	USD
CY2012	ni	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	-3800000	USD
CY2011	ni	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	16800000	USD
CY2010	ni	Income From Unconsolidated Affiliates IncomeFromUnconsolidatedAffiliates	14800000	USD
CY2009Q4	ni	Income Tax Refunds IncomeTaxRefunds	25300000	USD
CY2009Q4	ni	Income Tax Refunds IncomeTaxRefunds	263500000	USD
CY2010Q1	ni	Income Tax Refunds IncomeTaxRefunds	25300000	USD
CY2010Q1	ni	Income Tax Refunds IncomeTaxRefunds	25300000	USD
CY2010	ni	Increase Decrease In Deferred Charges And Other Non Current Assets IncreaseDecreaseInDeferredChargesAndOtherNonCurrentAssets	7900000	USD
CY2012	ni	Increase Decrease In Deferred Charges And Other Non Current Assets IncreaseDecreaseInDeferredChargesAndOtherNonCurrentAssets	71900000	USD
CY2011	ni	Increase Decrease In Deferred Charges And Other Non Current Assets IncreaseDecreaseInDeferredChargesAndOtherNonCurrentAssets	6900000	USD
CY2011	ni	Increase Decrease In Exchange Gas Receivable Payable IncreaseDecreaseInExchangeGasReceivablePayable	100100000	USD
CY2010	ni	Increase Decrease In Exchange Gas Receivable Payable IncreaseDecreaseInExchangeGasReceivablePayable	14200000	USD
CY2012	ni	Increase Decrease In Exchange Gas Receivable Payable IncreaseDecreaseInExchangeGasReceivablePayable	8600000	USD
CY2012	ni	Increase Decrease In Other Accruals IncreaseDecreaseInOtherAccruals	26200000	USD
CY2011	ni	Increase Decrease In Other Accruals IncreaseDecreaseInOtherAccruals	-33200000	USD
CY2010	ni	Increase Decrease In Other Accruals IncreaseDecreaseInOtherAccruals	-63400000	USD
CY2011	ni	Increase Decrease In Prepayments And Other Current Assets IncreaseDecreaseInPrepaymentsAndOtherCurrentAssets	-10200000	USD
CY2012	ni	Increase Decrease In Prepayments And Other Current Assets IncreaseDecreaseInPrepaymentsAndOtherCurrentAssets	-4500000	USD
CY2010	ni	Increase Decrease In Prepayments And Other Current Assets IncreaseDecreaseInPrepaymentsAndOtherCurrentAssets	-11500000	USD
CY2012	ni	Increase Decrease Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax IncreaseDecreaseOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1700000	USD
CY2011	ni	Increase Decrease Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax IncreaseDecreaseOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	700000	USD
CY2010	ni	Increase Decrease Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax IncreaseDecreaseOtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	800000	USD
CY2012	ni	Incremental Common Shares Attributable To Nonqualified Stock Options IncrementalCommonSharesAttributableToNonqualifiedStockOptions	144000	shares
CY2011	ni	Incremental Common Shares Attributable To Nonqualified Stock Options IncrementalCommonSharesAttributableToNonqualifiedStockOptions	9000	shares
CY2010	ni	Incremental Common Shares Attributable To Nonqualified Stock Options IncrementalCommonSharesAttributableToNonqualifiedStockOptions	0	shares
CY2011Q4	ni	Initial Margin On Deposit Transferred InitialMarginOnDepositTransferred	5700000	USD
CY2011Q4	ni	Initial Margin To Open Accounts For Mark To Market Losses InitialMarginToOpenAccountsForMarkToMarketLosses	6900000	USD
CY2012Q4	ni	Interest On Affiliated Notes Payable InterestOnAffiliatedNotesPayable	793000000	USD
CY2011Q4	ni	Interest On Affiliated Notes Payable InterestOnAffiliatedNotesPayable	573700000	USD
CY2010	ni	Interest Paid Net Capitalized Interest InterestPaidNetCapitalizedInterest	393000000	USD
CY2012	ni	Interest Paid Net Capitalized Interest InterestPaidNetCapitalizedInterest	386800000	USD
CY2011	ni	Interest Paid Net Capitalized Interest InterestPaidNetCapitalizedInterest	369200000	USD
CY2003Q3	ni	Interest Rate Swap Agreements Term InterestRateSwapAgreementsTerm	P11Y
CY2012Q4	ni	Legal And Environmental Reserves LegalAndEnvironmentalReserves	42200000	USD
CY2011Q4	ni	Legal And Environmental Reserves LegalAndEnvironmentalReserves	43900000	USD
CY2012	ni	Long Term Receivable LongTermReceivable	34400000	USD
CY2010Q4	ni	Long Term Receivable LongTermReceivable	31500000	USD
CY2011Q4	ni	Mark To Market Loss MarkToMarketLoss	46400000	USD
CY2012Q4	ni	Nol Carryforwards Recognized From Remeasurement NolCarryforwardsRecognizedFromRemeasurement	6800000	USD
CY2012	ni	Number Of Customers NumberOfCustomers	3800000
CY2012	ni	Number Of Direct Subsidiaries NumberOfDirectSubsidiaries	13
CY2012	ni	Number Of Notes Tranches Through Private Placement Issuance NumberOfNotesTranchesThroughPrivatePlacementIssuance	2
CY2012	ni	Number Of Reporting Units For Goodwill NumberOfReportingUnitsForGoodwill	3
CY2011Q4	ni	Offset For Outstanding Irs Refunds OffsetForOutstandingIrsRefunds	-87900000	USD
CY2010Q4	ni	Offset For Outstanding Irs Refunds OffsetForOutstandingIrsRefunds	-114200000	USD
CY2012Q4	ni	Offset For Outstanding Irs Refunds OffsetForOutstandingIrsRefunds	-16000000	USD
CY2011	ni	Other Comprehensive Income Increase Decrease In Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeIncreaseDecreaseInUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1100000	USD
CY2012	ni	Other Comprehensive Income Increase Decrease In Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeIncreaseDecreaseInUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	2100000	USD
CY2010	ni	Other Comprehensive Income Increase Decrease In Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeIncreaseDecreaseInUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	7600000	USD
CY2011Q4	ni	Other Regulatory Assets OtherRegulatoryAssets	858800000	USD
CY2012Q4	ni	Other Regulatory Assets OtherRegulatoryAssets	840000000	USD
CY2005Q3	ni	Payment For Settlement Of Interest Rate Swap PaymentForSettlementOfInterestRateSwap	35500000	USD
CY2011	ni	Payments Pure Air PaymentsPureAir	23200000	USD
CY2012	ni	Payments Pure Air PaymentsPureAir	21600000	USD
CY2012	ni	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	1585100000	USD
CY2010	ni	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	803800000	USD
CY2011	ni	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	1125200000	USD
CY2012	ni	Percentage Of Additional Subset Of Assets Capped PercentageOfAdditionalSubsetOfAssetsCapped	0.10
CY2011Q4	ni	Physical Sale Contract Derivatives Reserves PhysicalSaleContractDerivativesReserves	25600000	USD
CY2012Q4	ni	Physical Sale Contract Derivatives Reserves PhysicalSaleContractDerivativesReserves	700000	USD
CY2012	ni	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.033
CY2011	ni	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.036
CY2010	ni	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.049
CY2012Q4	ni	Premiums And Discounts Associated With Long Term Debt PremiumsAndDiscountsAssociatedWithLongTermDebt	12100000	USD
CY2011Q4	ni	Premiums And Discounts Associated With Long Term Debt PremiumsAndDiscountsAssociatedWithLongTermDebt	12800000	USD
CY2012	ni	Primary Business Segments PrimaryBusinessSegments	3
CY2011Q4	ni	Public Utilities Property Plant And Equipment Other Property At Cost Less Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyAtCostLessAccumulatedDepreciation	131400000	USD
CY2012Q4	ni	Public Utilities Property Plant And Equipment Other Property At Cost Less Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyAtCostLessAccumulatedDepreciation	260000000	USD
CY2011Q4	ni	Public Utilities Property Plant And Equipment Plant In Service Net PublicUtilitiesPropertyPlantAndEquipmentPlantInServiceNet	11647800000	USD
CY2012Q4	ni	Public Utilities Property Plant And Equipment Plant In Service Net PublicUtilitiesPropertyPlantAndEquipmentPlantInServiceNet	12655900000	USD
CY2012Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due PurchaseAndServiceObligationsMinimumFixedPaymentsDue	2388500000	USD
CY2012Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due Current PurchaseAndServiceObligationsMinimumFixedPaymentsDueCurrent	611200000	USD
CY2012Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due In Five Years PurchaseAndServiceObligationsMinimumFixedPaymentsDueInFiveYears	146300000	USD
CY2012Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due In Four Years PurchaseAndServiceObligationsMinimumFixedPaymentsDueInFourYears	169200000	USD
CY2012Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due In Three Years PurchaseAndServiceObligationsMinimumFixedPaymentsDueInThreeYears	401500000	USD
CY2012Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due In Two Years PurchaseAndServiceObligationsMinimumFixedPaymentsDueInTwoYears	501100000	USD
CY2012Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due Thereafter PurchaseAndServiceObligationsMinimumFixedPaymentsDueThereafter	559200000	USD
CY2012Q4	ni	Purchase Sale Agreements Additional Guarantee Obligations PurchaseSaleAgreementsAdditionalGuaranteeObligations	30000000	USD
CY2011Q2	ni	Real Estate Sales Period RealEstateSalesPeriod	P10Y
CY2012Q4	ni	Regulatory Assets Current And Noncurrent RegulatoryAssetsCurrentAndNoncurrent	2187200000	USD
CY2011Q4	ni	Regulatory Assets Current And Noncurrent RegulatoryAssetsCurrentAndNoncurrent	2147900000	USD
CY2012Q4	ni	Regulatory Assets Requiring Specific Rate Action RegulatoryAssetsRequiringSpecificRateAction	146200000	USD
CY2011Q4	ni	Regulatory Liabilities Current Noncurrent RegulatoryLiabilitiesCurrentNoncurrent	1775900000	USD
CY2012Q4	ni	Regulatory Liabilities Current Noncurrent RegulatoryLiabilitiesCurrentNoncurrent	1764900000	USD
CY2010	ni	Regulatory Treatment Of Afduc Equity RegulatoryTreatmentOfAfducEquity	0.005
CY2011	ni	Regulatory Treatment Of Afduc Equity RegulatoryTreatmentOfAfducEquity	0.001
CY2012	ni	Regulatory Treatment Of Afduc Equity RegulatoryTreatmentOfAfducEquity	0.005
CY2011	ni	Regulatory Treatment Of Afudc Equity RegulatoryTreatmentOfAfudcEquity	600000	USD
CY2010	ni	Regulatory Treatment Of Afudc Equity RegulatoryTreatmentOfAfudcEquity	1900000	USD
CY2012	ni	Regulatory Treatment Of Afudc Equity RegulatoryTreatmentOfAfudcEquity	3100000	USD
CY2012Q4	ni	Remaining Unrecognized Tax Benefits Resulting In Net Operating Loss Carry Forward RemainingUnrecognizedTaxBenefitsResultingInNetOperatingLossCarryForward	176500000	USD
CY2011Q4	ni	Reserve Of Assets Related To Wind Down Of Unregulated Gas Marketing Business ReserveOfAssetsRelatedToWindDownOfUnregulatedGasMarketingBusiness	22600000	USD
CY2012Q4	ni	Unamortized Discount And Premium UnamortizedDiscountAndPremium	41300000	USD
CY2012	ni	Securitization Transaction Fees SecuritizationTransactionFees	3500000	USD
CY2011	ni	Securitization Transaction Fees SecuritizationTransactionFees	3800000	USD
CY2012Q4	ni	Security Interest And Other Subset Of Asset SecurityInterestAndOtherSubsetOfAsset	150000000	USD
CY2012	ni	Service Area By County ServiceAreaByCounty	20
CY2012	ni	Stock Issued During Period Forward Equitysettlement StockIssuedDuringPeriodForwardEquitysettlement	338900000	USD
CY2012	ni	Stock Issued During Period Shares Forward Equity Settlement StockIssuedDuringPeriodSharesForwardEquitySettlement	24265000000	shares
CY2011	ni	Stock Issued During Period Shares Retirement Savings Plan StockIssuedDuringPeriodSharesRetirementSavingsPlan	1594000000	shares
CY2012	ni	Stock Issued During Period Shares Retirement Savings Plan StockIssuedDuringPeriodSharesRetirementSavingsPlan	1496000000	shares
CY2010	ni	Stock Issued During Period Shares Retirement Savings Plan StockIssuedDuringPeriodSharesRetirementSavingsPlan	1498000000	shares
CY2012	ni	Stock Issued During Period Value Defined Contribution And Profit Sharing Plan StockIssuedDuringPeriodValueDefinedContributionAndProfitSharingPlan	36300000	USD
CY2011	ni	Stock Issued During Period Value Defined Contribution And Profit Sharing Plan StockIssuedDuringPeriodValueDefinedContributionAndProfitSharingPlan	32000000	USD
CY2010	ni	Stock Issued During Period Value Defined Contribution And Profit Sharing Plan StockIssuedDuringPeriodValueDefinedContributionAndProfitSharingPlan	24200000	USD
CY2012	ni	Stock Issued To Employee Savings Plans StockIssuedToEmployeeSavingsPlans	27300000	USD
CY2010	ni	Stock Issued To Employee Savings Plans StockIssuedToEmployeeSavingsPlans	19700000	USD
CY2011	ni	Stock Issued To Employee Savings Plans StockIssuedToEmployeeSavingsPlans	25800000	USD
CY2011Q4	ni	Trade Receivables Available For Transfer TradeReceivablesAvailableForTransfer	510500000	USD
CY2012Q4	ni	Trade Receivables Available For Transfer TradeReceivablesAvailableForTransfer	525300000	USD
CY2011Q4	ni	Trade Receivables Not Transferred TradeReceivablesNotTransferred	278800000	USD
CY2012Q4	ni	Trade Receivables Not Transferred TradeReceivablesNotTransferred	292000000	USD
CY2011Q4	ni	Trade Receivables Transferred Net TradeReceivablesTransferredNet	231700000	USD
CY2012Q4	ni	Trade Receivables Transferred Net TradeReceivablesTransferredNet	233300000	USD
CY2011Q4	ni	Transfer Of Capital From One Subsidiary To Other Subsidiary TransferOfCapitalFromOneSubsidiaryToOtherSubsidiary	14300000	USD
CY2012Q4	ni	Transfer Of Capital From One Subsidiary To Other Subsidiary TransferOfCapitalFromOneSubsidiaryToOtherSubsidiary	31400000	USD
CY2012Q4	ni	Unrecognized Tax Benefit Related To Uncertain Tax Position UnrecognizedTaxBenefitRelatedToUncertainTaxPosition	21100000	USD
CY2011Q4	ni	Unrecognized Tax Benefit Related To Uncertain Tax Position UnrecognizedTaxBenefitRelatedToUncertainTaxPosition	19900000	USD
CY2010Q4	ni	Unrecognized Tax Benefit Related To Uncertain Tax Position UnrecognizedTaxBenefitRelatedToUncertainTaxPosition	17600000	USD
CY2012Q4	ni	Unrecognized Tax Benefit Related To Uncertain Tax Position Net UnrecognizedTaxBenefitRelatedToUncertainTaxPositionNet	3200000	USD
CY2010Q4	ni	Unrecognized Tax Benefits Net Of Refunds And Net Operating Loss Carryforwards UnrecognizedTaxBenefitsNetOfRefundsAndNetOperatingLossCarryforwards	-2200000	USD
CY2011Q4	ni	Unrecognized Tax Benefits Net Of Refunds And Net Operating Loss Carryforwards UnrecognizedTaxBenefitsNetOfRefundsAndNetOperatingLossCarryforwards	4100000	USD
CY2012Q4	ni	Unrecognized Tax Benefits Net Of Refunds And Net Operating Loss Carryforwards UnrecognizedTaxBenefitsNetOfRefundsAndNetOperatingLossCarryforwards	2300000	USD
CY2011Q3	ni	Unrecognized Tax Benefits That Would Not Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldNotImpactEffectiveTaxRate	12900000	USD
CY2012Q4	ni	Unrecovered Gas And Fuel Costs UnrecoveredGasAndFuelCosts	23200000	USD
CY2011Q4	ni	Unrecovered Gas And Fuel Costs UnrecoveredGasAndFuelCosts	14600000	USD
CY2011Q4	ni	Valuation Reserve ValuationReserve	22600000	USD
CY2012	ni	Variable Interest Contract Period VariableInterestContractPeriod	P10Y
CY2008Q3	ni	Wind Power Purchase Agreement Capacity WindPowerPurchaseAgreementCapacity	100	MW
CY2012	ni	Write Off Of Price Risk Asset Related With Wind Down Of Unregulated Natural Gas Business WriteOffOfPriceRiskAssetRelatedWithWindDownOfUnregulatedNaturalGasBusiness	43800000	USD
CY2012	dei	Amendment Flag AmendmentFlag	false
CY2012	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2012	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2012	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2012
CY2012	dei	Document Period End Date DocumentPeriodEndDate	2012-12-31
CY2012	dei	Document Type DocumentType	10-K
CY2012	dei	Entity Central Index Key EntityCentralIndexKey	0001111711
CY2013Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	311188068	shares
CY2012	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2012	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2012Q2	dei	Entity Public Float EntityPublicFloat	7017170104	USD
CY2012	dei	Entity Registrant Name EntityRegistrantName	NISOURCE INC/DE
CY2012	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2012	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes

Files In Submission

Name	View Source	Status
0001111711-13-000007-index-headers.html	Edgar Link	pending
0001111711-13-000007-index.html	Edgar Link	pending
0001111711-13-000007.txt	Edgar Link	pending
0001111711-13-000007-xbrl.zip	Edgar Link	pending
FilingSummary.xml	Edgar Link	unprocessable
Financial_Report.xls	Edgar Link	pending
ni-20121231.xml	Edgar Link	completed
ni-20121231.xsd	Edgar Link	pending
ni-20121231x10k.htm	Edgar Link	pending
ni-20121231xex1020.htm	Edgar Link	pending
ni-20121231xex1021.htm	Edgar Link	pending
ni-20121231xex1022.htm	Edgar Link	pending
ni-20121231xex106.htm	Edgar Link	pending
ni-20121231xex12.htm	Edgar Link	pending
ni-20121231xex21.htm	Edgar Link	pending
ni-20121231xex23.htm	Edgar Link	pending
ni-20121231xex311.htm	Edgar Link	pending
ni-20121231xex312.htm	Edgar Link	pending
ni-20121231xex321.htm	Edgar Link	pending
ni-20121231xex322.htm	Edgar Link	pending
ni-20121231_cal.xml	Edgar Link	unprocessable
ni-20121231_def.xml	Edgar Link	unprocessable
ni-20121231_lab.xml	Edgar Link	unprocessable
ni-20121231_pre.xml	Edgar Link	unprocessable
R1.htm	Edgar Link	pending
R10.htm	Edgar Link	pending
R100.htm	Edgar Link	pending
R101.htm	Edgar Link	pending
R102.htm	Edgar Link	pending
R103.htm	Edgar Link	pending
R104.htm	Edgar Link	pending
R105.htm	Edgar Link	pending
R106.htm	Edgar Link	pending
R107.htm	Edgar Link	pending
R108.htm	Edgar Link	pending
R109.htm	Edgar Link	pending
R11.htm	Edgar Link	pending
R110.htm	Edgar Link	pending
R111.htm	Edgar Link	pending
R112.htm	Edgar Link	pending
R113.htm	Edgar Link	pending
R114.htm	Edgar Link	pending
R115.htm	Edgar Link	pending
R116.htm	Edgar Link	pending
R117.htm	Edgar Link	pending
R118.htm	Edgar Link	pending
R119.htm	Edgar Link	pending
R12.htm	Edgar Link	pending
R120.htm	Edgar Link	pending
R121.htm	Edgar Link	pending
R122.htm	Edgar Link	pending
R123.htm	Edgar Link	pending
R124.htm	Edgar Link	pending
R125.htm	Edgar Link	pending
R126.htm	Edgar Link	pending
R127.htm	Edgar Link	pending
R128.htm	Edgar Link	pending
R129.htm	Edgar Link	pending
R13.htm	Edgar Link	pending
R130.htm	Edgar Link	pending
R131.htm	Edgar Link	pending
R132.htm	Edgar Link	pending
R133.htm	Edgar Link	pending
R134.htm	Edgar Link	pending
R135.htm	Edgar Link	pending
R136.htm	Edgar Link	pending
R137.htm	Edgar Link	pending
R138.htm	Edgar Link	pending
R139.htm	Edgar Link	pending
R14.htm	Edgar Link	pending
R140.htm	Edgar Link	pending
R15.htm	Edgar Link	pending
R16.htm	Edgar Link	pending
R17.htm	Edgar Link	pending
R18.htm	Edgar Link	pending
R19.htm	Edgar Link	pending
R2.htm	Edgar Link	pending
R20.htm	Edgar Link	pending
R21.htm	Edgar Link	pending
R22.htm	Edgar Link	pending
R23.htm	Edgar Link	pending
R24.htm	Edgar Link	pending
R25.htm	Edgar Link	pending
R26.htm	Edgar Link	pending
R27.htm	Edgar Link	pending
R28.htm	Edgar Link	pending
R29.htm	Edgar Link	pending
R3.htm	Edgar Link	pending
R30.htm	Edgar Link	pending
R31.htm	Edgar Link	pending
R32.htm	Edgar Link	pending
R33.htm	Edgar Link	pending
R34.htm	Edgar Link	pending
R35.htm	Edgar Link	pending
R36.htm	Edgar Link	pending
R37.htm	Edgar Link	pending
R38.htm	Edgar Link	pending
R39.htm	Edgar Link	pending
R4.htm	Edgar Link	pending
R40.htm	Edgar Link	pending
R41.htm	Edgar Link	pending
R42.htm	Edgar Link	pending
R43.htm	Edgar Link	pending
R44.htm	Edgar Link	pending
R45.htm	Edgar Link	pending
R46.htm	Edgar Link	pending
R47.htm	Edgar Link	pending
R48.htm	Edgar Link	pending
R49.htm	Edgar Link	pending
R5.htm	Edgar Link	pending
R50.htm	Edgar Link	pending
R51.htm	Edgar Link	pending
R52.htm	Edgar Link	pending
R53.htm	Edgar Link	pending
R54.htm	Edgar Link	pending
R55.htm	Edgar Link	pending
R56.htm	Edgar Link	pending
R57.htm	Edgar Link	pending
R58.htm	Edgar Link	pending
R59.htm	Edgar Link	pending
R6.htm	Edgar Link	pending
R60.htm	Edgar Link	pending
R61.htm	Edgar Link	pending
R62.htm	Edgar Link	pending
R63.htm	Edgar Link	pending
R64.htm	Edgar Link	pending
R65.htm	Edgar Link	pending
R66.htm	Edgar Link	pending
R67.htm	Edgar Link	pending
R68.htm	Edgar Link	pending
R69.htm	Edgar Link	pending
R7.htm	Edgar Link	pending
R70.htm	Edgar Link	pending
R71.htm	Edgar Link	pending
R72.htm	Edgar Link	pending
R73.htm	Edgar Link	pending
R74.htm	Edgar Link	pending
R75.htm	Edgar Link	pending
R76.htm	Edgar Link	pending
R77.htm	Edgar Link	pending
R78.htm	Edgar Link	pending
R79.htm	Edgar Link	pending
R8.htm	Edgar Link	pending
R80.htm	Edgar Link	pending
R81.htm	Edgar Link	pending
R82.htm	Edgar Link	pending
R83.htm	Edgar Link	pending
R84.htm	Edgar Link	pending
R85.htm	Edgar Link	pending
R86.htm	Edgar Link	pending
R87.htm	Edgar Link	pending
R88.htm	Edgar Link	pending
R89.htm	Edgar Link	pending
R9.htm	Edgar Link	pending
R90.htm	Edgar Link	pending
R91.htm	Edgar Link	pending
R92.htm	Edgar Link	pending
R93.htm	Edgar Link	pending
R94.htm	Edgar Link	pending
R95.htm	Edgar Link	pending
R96.htm	Edgar Link	pending
R97.htm	Edgar Link	pending
R98.htm	Edgar Link	pending
R99.htm	Edgar Link	pending
report.css	Edgar Link	pending
Show.js	Edgar Link	pending

Create your account

Find Stocks Worth Researching

Deeply Understand Businesses

Value Businesses Intelligently

$NI
NISOURCE INC. Stock $ni

2012 Q3 Form 10-K Financial Statement

#000111171113000007 Filed on February 19, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NI NISOURCE INC. Stock $ni

2012 Q3 Form 10-K Financial Statement

#000111171113000007 Filed on February 19, 2013

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NI
NISOURCE INC. Stock $ni