$NI
NISOURCE INC. Stock $ni

$ni Overview Financials Valuation SEC Filings Company Website

2013 Q3 Form 10-K Financial Statement

#000111171114000016 Filed on February 18, 2014

Income Statement

Concept	2013 Q3	2013 Q2	2013 Q1
Revenue	$1.077B	$1.202B	$1.782B
YoY Change	12.61%	15.66%	8.02%
Cost Of Revenue	$243.0M	$349.3M	$676.0M
YoY Change	6.95%	46.27%	7.75%
Gross Profit	$833.8M	$852.2M	$1.106B
YoY Change	14.38%	6.53%	8.29%
Gross Profit Margin	77.43%	70.93%	62.07%
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization	$144.5M	$143.3M	$143.6M
YoY Change	15.32%	-2.72%	-1.24%
% of Gross Profit	17.33%	16.82%	12.98%
Operating Expenses	$667.9M	$666.2M	$684.4M
YoY Change	10.31%	10.39%	8.38%
Operating Profit	$176.4M	$194.0M	$428.9M
YoY Change	34.14%	-4.15%	7.33%
Interest Expense	$103.7M	$102.0M	$98.60M
YoY Change	-3.89%	-1.16%	-4.55%
% of Operating Profit	58.79%	52.58%	22.99%
Other Income/Expense, Net	-$99.00M	-$88.70M	-$94.50M
YoY Change	-6.34%	-11.65%	-8.25%
Pretax Income	$77.40M	$105.3M	$334.4M
YoY Change	200.0%	0.67%	13.47%
Income Tax	$27.90M	$32.90M	$118.4M
% Of Pretax Income	36.05%	31.24%	35.41%
Net Earnings	$48.10M	$71.70M	$260.5M
YoY Change	149.22%	3.31%	34.69%
Net Earnings / Revenue	4.47%	5.97%	14.62%
Basic Earnings Per Share	$0.16	$0.23	$0.83
Diluted Earnings Per Share	$0.16	$0.23	$0.83
COMMON SHARES
Basic Shares Outstanding	312.8M shares	312.2M shares	311.1M shares
Diluted Shares Outstanding	313.8M shares	313.2M shares	312.1M shares

Balance Sheet

Concept	2013 Q3	2013 Q2	2013 Q1
SHORT-TERM ASSETS
Cash & Short-Term Investments	$15.00M	$45.00M	$101.0M
YoY Change	25.0%	-15.09%	158.97%
Cash & Equivalents	$36.30M	$44.50M	$101.4M
Short-Term Investments
Other Short-Term Assets	$246.1M	$224.4M	$228.1M
YoY Change	-12.36%	-18.16%	-70.38%
Inventory	$595.0M	$420.0M	$241.0M
Prepaid Expenses
Receivables	$591.0M	$716.5M	$1.070B
Other Receivables	$91.00M	$87.00M	$152.0M
Total Short-Term Assets	$1.746B	$1.708B	$2.032B
YoY Change	-5.07%	-2.51%	3.14%
LONG-TERM ASSETS
Property, Plant & Equipment	$13.91B	$13.47B	$13.12B
YoY Change	10.91%	10.91%	10.23%
Goodwill	$3.666B	$3.666B	$3.666B
YoY Change	-0.3%	-0.3%
Intangibles
YoY Change
Long-Term Investments	$529.0M	$469.0M	$451.0M
YoY Change	28.4%	27.45%	24.93%
Other Assets	$5.897B	$5.972B	$6.035B
YoY Change	-2.46%	-2.75%	169.4%
Total Long-Term Assets	$20.34B	$19.91B	$19.60B
YoY Change	7.05%	6.73%	6.11%
TOTAL ASSETS
Total Short-Term Assets	$1.746B	$1.708B	$2.032B
Total Long-Term Assets	$20.34B	$19.91B	$19.60B
Total Assets	$22.08B	$21.62B	$21.64B
YoY Change	5.98%	5.94%	5.82%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable	$369.6M	$393.0M	$527.4M
YoY Change	23.16%	34.54%	38.43%
Accrued Expenses	$386.0M	$415.0M	$344.0M
YoY Change	12.87%	14.33%	2.08%
Deferred Revenue
YoY Change
Short-Term Debt	$820.8M	$377.7M	$1.131B
YoY Change	264.31%	15.29%	-10.52%
Long-Term Debt Due	$541.0M	$71.00M	$89.00M
YoY Change	-34.26%	-90.74%	-88.15%
Total Short-Term Liabilities	$3.006B	$2.068B	$2.974B
YoY Change	10.21%	-22.32%	-20.0%
LONG-TERM LIABILITIES
Long-Term Debt	$7.089B	$7.617B	$6.804B
YoY Change	3.94%	11.9%	16.63%
Other Long-Term Liabilities	$219.1M	$216.4M	$225.0M
YoY Change	-11.01%	-10.62%	-92.63%
Total Long-Term Liabilities	$6.289B	$6.234B	$6.167B
YoY Change	6.93%	6.84%	-30.6%
TOTAL LIABILITIES
Total Short-Term Liabilities	$3.006B	$2.068B	$2.974B
Total Long-Term Liabilities	$6.289B	$6.234B	$6.167B
Total Liabilities	$9.294B	$8.302B	$9.142B
YoY Change	7.97%	-2.29%	-40.5%
SHAREHOLDERS EQUITY
Retained Earnings	$1.134B	$1.164B	$1.171B
YoY Change	22.48%	18.68%
Common Stock	$4.676B	$4.649B	$4.631B
YoY Change	2.04%	10.07%
Preferred Stock
YoY Change
Treasury Stock (at cost)	$48.60M	$48.50M	$48.10M
YoY Change	20.0%	19.75%
Treasury Stock Shares
Shareholders Equity	$5.701B	$5.703B	$5.691B
YoY Change
Total Liabilities & Shareholders Equity	$22.08B	$21.62B	$21.64B
YoY Change	5.98%	5.94%	5.82%

Cashflow Statement

Concept	2013 Q3	2013 Q2	2013 Q1
OPERATING ACTIVITIES
Net Income	$48.10M	$71.70M	$260.5M
YoY Change	149.22%	3.31%	34.69%
Depreciation, Depletion And Amortization	$144.5M	$143.3M	$143.6M
YoY Change	15.32%	-2.72%	-1.24%
Cash From Operating Activities	$184.1M	$445.4M	$449.1M
YoY Change	8.29%	52.64%	-6.44%
INVESTING ACTIVITIES
Capital Expenditures	-$495.6M	-$432.4M	$369.3M
YoY Change	23.07%	32.27%	26.56%
Acquisitions
YoY Change
Other Investing Activities	-$37.60M	-$39.60M	$5.300M
YoY Change	-285.22%	-175.14%	-49.04%
Cash From Investing Activities	-$533.2M	-$472.0M	-$246.1M
YoY Change	39.44%	72.14%	-16.49%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net			-$9.600M
YoY Change			28.0%
Debt Paid & Issued, Net			$427.1M
YoY Change			7138.98%
Cash From Financing Activities	319.5M	-30.30M	-$137.9M
YoY Change	85.86%	818.18%	-12.89%
NET CHANGE
Cash From Operating Activities	184.1M	445.4M	$449.1M
Cash From Investing Activities	-533.2M	-472.0M	-$246.1M
Cash From Financing Activities	319.5M	-30.30M	-$137.9M
Net Change In Cash	-29.60M	-56.90M	$65.10M
YoY Change	-26.91%	-497.9%	141.11%
FREE CASH FLOW
Cash From Operating Activities	$184.1M	$445.4M	$449.1M
Capital Expenditures	-$495.6M	-$432.4M	$369.3M
Free Cash Flow	$679.7M	$877.8M	$79.80M
YoY Change	18.68%	41.88%	-57.6%

Facts In Submission

Frame	Concept Type	Concept / XBRL Key	Value	Unit
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CY2013Q4	us-gaap	Accrual For Environmental Loss Contingencies AccrualForEnvironmentalLossContingencies	143900000	USD
CY2013Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	20900000	USD
CY2012Q4	us-gaap	Accumulated Deferred Investment Tax Credit AccumulatedDeferredInvestmentTaxCredit	24800000	USD
CY2012Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	9025000000	USD
CY2013Q4	us-gaap	Accumulated Depreciation Depletion And Amortization Property Plant And Equipment AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment	9299100000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Cumulative Changes In Net Gain Loss From Cash Flow Hedges Effect Net Of Tax AccumulatedOtherComprehensiveIncomeLossCumulativeChangesInNetGainLossFromCashFlowHedgesEffectNetOfTax	8200000	USD
CY2012Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-65500000	USD
CY2012Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	538900000	USD
CY2013Q4	us-gaap	Accounts Payable Current AccountsPayableCurrent	619000000	USD
CY2013Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	1005800000	USD
CY2012Q4	us-gaap	Accounts Receivable Net Current AccountsReceivableNetCurrent	907300000	USD
CY2013Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-43600000	USD
CY2011Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-59700000	USD
CY2010Q4	us-gaap	Accumulated Other Comprehensive Income Loss Net Of Tax AccumulatedOtherComprehensiveIncomeLossNetOfTax	-57900000	USD
CY2013Q4	us-gaap	Additional Collateral Aggregate Fair Value AdditionalCollateralAggregateFairValue	900000	USD
CY2012Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4597600000	USD
CY2013Q4	us-gaap	Additional Paid In Capital Common Stock AdditionalPaidInCapitalCommonStock	4690100000	USD
CY2013	us-gaap	Adjustment For Amortization AdjustmentForAmortization	166500000	USD
CY2012	us-gaap	Adjustment For Amortization AdjustmentForAmortization	155500000	USD
CY2012	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	17800000	USD
CY2013	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	20700000	USD
CY2011	us-gaap	Allocated Share Based Compensation Expense AllocatedShareBasedCompensationExpense	13400000	USD
CY2013Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	23500000	USD
CY2012Q4	us-gaap	Allowance For Doubtful Accounts Receivable Current AllowanceForDoubtfulAccountsReceivableCurrent	24000000	USD
CY2012	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	9700000	USD
CY2011	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	8900000	USD
CY2013	us-gaap	Amortization Of Debt Discount Premium AmortizationOfDebtDiscountPremium	9400000	USD
CY2013	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11000000	USD
CY2012	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11000000	USD
CY2011	us-gaap	Amortization Of Intangible Assets AmortizationOfIntangibleAssets	11000000	USD
CY2012	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2011	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	2800000	shares
CY2013	us-gaap	Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount	0	shares
CY2012	us-gaap	Asset Impairment Charges AssetImpairmentCharges	300000	USD
CY2013	us-gaap	Asset Impairment Charges AssetImpairmentCharges	100000	USD
CY2011	us-gaap	Asset Impairment Charges AssetImpairmentCharges	16700000	USD
CY2012	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1100000	USD
CY2013	us-gaap	Asset Retirement Obligation Accretion Expense AssetRetirementObligationAccretionExpense	1200000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	10100000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Incurred AssetRetirementObligationLiabilitiesIncurred	1600000	USD
CY2013	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	6000000	USD
CY2012	us-gaap	Asset Retirement Obligation Liabilities Settled AssetRetirementObligationLiabilitiesSettled	1400000	USD
CY2013	us-gaap	Asset Retirement Obligation Revision Of Estimate AssetRetirementObligationRevisionOfEstimate	500000	USD
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CY2012Q4	us-gaap	Assets Current AssetsCurrent	2367700000	USD
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CY2013Q4	us-gaap	Assets Of Disposal Group Including Discontinued Operation Current AssetsOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
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CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due In Five Years CapitalLeasesFutureMinimumPaymentsDueInFiveYears	16800000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due In Four Years CapitalLeasesFutureMinimumPaymentsDueInFourYears	16700000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due In Three Years CapitalLeasesFutureMinimumPaymentsDueInThreeYears	17100000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due In Two Years CapitalLeasesFutureMinimumPaymentsDueInTwoYears	46700000	USD
CY2013Q4	us-gaap	Capital Leases Future Minimum Payments Due Thereafter CapitalLeasesFutureMinimumPaymentsDueThereafter	155900000	USD
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CY2012	us-gaap	Capitalized Computer Software Amortization CapitalizedComputerSoftwareAmortization	30600000	USD
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CY2013Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	149100000	USD
CY2012Q4	us-gaap	Capitalized Computer Software Gross CapitalizedComputerSoftwareGross	142600000	USD
CY2013Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	26800000	USD
CY2012Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	36300000	USD
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CY2011Q4	us-gaap	Cash And Cash Equivalents At Carrying Value CashAndCashEquivalentsAtCarryingValue	11500000	USD
CY2013	us-gaap	Cash Flow Hedge Gain Loss To Be Reclassified Within Twelve Months CashFlowHedgeGainLossToBeReclassifiedWithinTwelveMonths	100000	USD
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CY2013	us-gaap	Cash Provided By Used In Operating Activities Discontinued Operations CashProvidedByUsedInOperatingActivitiesDiscontinuedOperations	10000000	USD
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CY2013Q4	us-gaap	Commercial Paper CommercialPaper	433600000	USD
CY2012Q4	us-gaap	Commercial Paper CommercialPaper	499600000	USD
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CY2012Q4	us-gaap	Commitments And Contingencies CommitmentsAndContingencies	0	USD
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CY2013Q4	us-gaap	Common Stock Shares Authorized CommonStockSharesAuthorized	400000000	shares
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CY2012Q4	us-gaap	Common Stock Value CommonStockValue	3100000	USD
CY2013Q4	us-gaap	Common Stock Value CommonStockValue	3200000	USD
CY2012	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	410300000	USD
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CY2013	us-gaap	Comprehensive Income Net Of Tax ComprehensiveIncomeNetOfTax	554000000	USD
CY2013	us-gaap	Cost Of Revenue CostOfRevenue	1815500000	USD
CY2011	us-gaap	Cost Of Revenue CostOfRevenue	2303500000	USD
CY2012	us-gaap	Cost Of Revenue CostOfRevenue	1516900000	USD
CY2013	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-15900000	USD
CY2011	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-24700000	USD
CY2012	us-gaap	Current Federal Tax Expense Benefit CurrentFederalTaxExpenseBenefit	-85800000	USD
CY2011	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-28200000	USD
CY2012	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-78000000	USD
CY2013	us-gaap	Current Income Tax Expense Benefit CurrentIncomeTaxExpenseBenefit	-25500000	USD
CY2013	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	-9600000	USD
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CY2012	us-gaap	Current State And Local Tax Expense Benefit CurrentStateAndLocalTaxExpenseBenefit	7800000	USD
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CY2013Q4	us-gaap	Deferred Gas Cost DeferredGasCost	46400000	USD
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CY2012	us-gaap	Deferred Other Tax Expense Benefit DeferredOtherTaxExpenseBenefit	-4100000	USD
CY2012Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	42800000	USD
CY2013Q4	us-gaap	Deferred Revenue Current DeferredRevenueCurrent	18500000	USD
CY2012Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	0	USD
CY2013Q4	us-gaap	Deferred Revenue Noncurrent DeferredRevenueNoncurrent	17100000	USD
CY2012	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	16900000	USD
CY2011	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	34400000	USD
CY2013	us-gaap	Deferred State And Local Income Tax Expense Benefit DeferredStateAndLocalIncomeTaxExpenseBenefit	25500000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	-1447700000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Gross DeferredTaxAssetsGross	-1389000000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Operating Loss Carryforwards DeferredTaxAssetsOperatingLossCarryforwards	-343400000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-60400000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Other DeferredTaxAssetsOther	-55900000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Credit Carryforwards Alternative Minimum Tax DeferredTaxAssetsTaxCreditCarryforwardsAlternativeMinimumTax	4700000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	-167800000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Postretirement Benefits DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsPostretirementBenefits	-353600000	USD
CY2012Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	-55400000	USD
CY2013Q4	us-gaap	Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Accrued Liabilities DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities	-29100000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	4181900000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities DeferredTaxLiabilities	4491500000	USD
CY2013Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	3277800000	USD
CY2012Q4	us-gaap	Deferred Tax Liabilities Noncurrent DeferredTaxLiabilitiesNoncurrent	2953300000	USD
CY2013	us-gaap	Defined Benefit Plan Assumptions Used Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets DefinedBenefitPlanAssumptionsUsedCalculatingNetPeriodicBenefitCostExpectedLongTermReturnOnAssets	0.0830
CY2013	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1	-44800000	USD
CY2013	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1 DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1	-3300000	USD
CY2013	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation	53100000	USD
CY2013	us-gaap	Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents	4100000	USD
CY2013Q4	us-gaap	Defined Benefit Plan Fair Value Of Plan Assets DefinedBenefitPlanFairValueOfPlanAssets	2721500000	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
CY2011	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	25900000	USD
CY2013	us-gaap	Defined Contribution Plan Cost Recognized DefinedContributionPlanCostRecognized	30000000	USD
CY2011	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	535700000	USD
CY2012	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	561900000	USD
CY2013	us-gaap	Depreciation Depletion And Amortization DepreciationDepletionAndAmortization	577300000	USD
CY2003Q3	us-gaap	Derivative Average Basis Spread On Variable Rate DerivativeAverageBasisSpreadOnVariableRate	0.0078
CY2013Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	23200000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Asset DerivativeFairValueOfDerivativeAsset	148200000	USD
CY2013Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	1700000	USD
CY2012Q4	us-gaap	Derivative Fair Value Of Derivative Liability DerivativeFairValueOfDerivativeLiability	115500000	USD
CY2003Q3	us-gaap	Derivative Fixed Interest Rate DerivativeFixedInterestRate	0.0540
CY2012Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	500000	USD
CY2013Q4	us-gaap	Derivative Instruments And Hedges DerivativeInstrumentsAndHedges	22700000	USD
CY2013Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	1400000	USD
CY2012Q4	us-gaap	Derivative Instruments And Hedges Liabilities DerivativeInstrumentsAndHedgesLiabilities	8200000	USD
CY2012Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	40700000	USD
CY2013Q4	us-gaap	Derivative Instruments And Hedges Noncurrent DerivativeInstrumentsAndHedgesNoncurrent	500000	USD
CY2012Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	2600000	USD
CY2013Q4	us-gaap	Derivative Liabilities Noncurrent DerivativeLiabilitiesNoncurrent	300000	USD
CY2012	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2013	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	34900000	USD
CY2011	us-gaap	Discontinued Operation Gain Loss On Disposal Of Discontinued Operation Net Of Tax DiscontinuedOperationGainLossOnDisposalOfDiscontinuedOperationNetOfTax	0	USD
CY2013	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	11600000	USD
CY2012	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	11300000	USD
CY2011	us-gaap	Discontinued Operation Income Loss From Discontinued Operation Before Income Tax DiscontinuedOperationIncomeLossFromDiscontinuedOperationBeforeIncomeTax	-16800000	USD
CY2012	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	4000000	USD
CY2011	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	-6300000	USD
CY2013	us-gaap	Discontinued Operation Tax Effect Of Discontinued Operation DiscontinuedOperationTaxEffectOfDiscontinuedOperation	5300000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Other Assets DisposalGroupIncludingDiscontinuedOperationOtherAssets	5400000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Other Liabilities DisposalGroupIncludingDiscontinuedOperationOtherLiabilities	3900000	USD
CY2013Q4	us-gaap	Disposal Group Including Discontinued Operation Property Plant And Equipment Net DisposalGroupIncludingDiscontinuedOperationPropertyPlantAndEquipmentNet	21500000	USD
CY2013	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	2500000	USD
CY2012	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	37100000	USD
CY2011	us-gaap	Disposal Group Including Discontinued Operation Revenue DisposalGroupIncludingDiscontinuedOperationRevenue	15300000	USD
CY2013	us-gaap	Dividend Payable Date To Be Paid Day Month And Year DividendPayableDateToBePaidDayMonthAndYear	2014-02-20
CY2011	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-258200000	USD
CY2012	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-273500000	USD
CY2013	us-gaap	Dividends Common Stock Cash DividendsCommonStockCash	-306200000	USD
CY2013	us-gaap	Dividends Common Stock Stock DividendsCommonStockStock	0.25	USD
CY2013	us-gaap	Dividends Payable Date Of Record Day Month And Year DividendsPayableDateOfRecordDayMonthAndYear	2014-02-10
CY2012Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	785400000	USD
CY2013Q4	us-gaap	Due From Related Parties Current DueFromRelatedPartiesCurrent	462100000	USD
CY2013Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	1031100000	USD
CY2012Q4	us-gaap	Due To Related Parties Current DueToRelatedPartiesCurrent	833100000	USD
CY2013Q4	us-gaap	Due To Related Parties Noncurrent DueToRelatedPartiesNoncurrent	3687800000	USD
CY2012Q4	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
CY2013	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	1.70
CY2012Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.06
CY2013Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.83
CY2012Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.24
CY2012Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.43
CY2012Q1	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.68
CY2013Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.48
CY2012Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.66
CY2013Q3	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.16
CY2013Q2	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.23
CY2013Q4	us-gaap	Earnings Per Share Basic EarningsPerShareBasic	0.48
CY2013	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.70
CY2012	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.39
CY2011	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	1.03
CY2012Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.22
CY2013Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.16
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	-0.009
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	0.000
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
CY2013Q2	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.23
CY2013Q1	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.83
CY2012Q3	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.06
CY2012Q4	us-gaap	Earnings Per Share Diluted EarningsPerShareDiluted	0.43
CY2013	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.348
CY2011	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.350
CY2012	us-gaap	Effective Income Tax Rate Continuing Operations EffectiveIncomeTaxRateContinuingOperations	0.344
CY2013	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
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 Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.005
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.005
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends EffectiveIncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	0.007
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense EffectiveIncomeTaxRateReconciliationNondeductibleExpense	0.006
CY2013	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
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Amortization EffectiveIncomeTaxRateReconciliationNondeductibleExpenseAmortization	-0.005
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Nondeductible Expense Depreciation EffectiveIncomeTaxRateReconciliationNondeductibleExpenseDepreciation	-0.018
CY2013	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.002
CY2012	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.008
CY2011	us-gaap	Effective Income Tax Rate Reconciliation Other Adjustments EffectiveIncomeTaxRateReconciliationOtherAdjustments	-0.012
CY2012	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.025
CY2013	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.014
CY2011	us-gaap	Effective Income Tax Rate Reconciliation State And Local Income Taxes EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes	0.043
CY2011	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	1427700000	USD
CY2012	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	1507700000	USD
CY2013	us-gaap	Electric Domestic Regulated Revenue ElectricDomesticRegulatedRevenue	1563400000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	8800000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	25400000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions	27500000	USD
CY2013Q4	us-gaap	Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized	18100000	USD
CY2012	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	6100000	USD
CY2013	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	7200000	USD
CY2011	us-gaap	Employee Service Share Based Compensation Tax Benefit From Compensation Expense EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense	4700000	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
CY2013Q4	us-gaap	Energy Related Inventory Coal EnergyRelatedInventoryCoal	44600000	USD
CY2013Q4	us-gaap	Energy Related Inventory Natural Gas In Storage EnergyRelatedInventoryNaturalGasInStorage	354600000	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
CY2011	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	18800000	USD
CY2013	us-gaap	Equity Method Investment Dividends Or Distributions EquityMethodInvestmentDividendsOrDistributions	32100000	USD
CY2012Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	-13200000	USD
CY2013Q4	us-gaap	Excess Of Replacement Or Current Costs Over Stated Lifo Value ExcessOfReplacementOrCurrentCostsOverStatedLIFOValue	600000	USD
CY2012	us-gaap	Fair Value Inputs Discount Rate FairValueInputsDiscountRate	0.0560
CY2013	us-gaap	Finite Lived Intangible Asset Useful Life FiniteLivedIntangibleAssetUsefulLife	P40Y
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Next Twelve Months FiniteLivedIntangibleAssetsAmortizationExpenseNextTwelveMonths	11000000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Five FiniteLivedIntangibleAssetsAmortizationExpenseYearFive	11000000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Four FiniteLivedIntangibleAssetsAmortizationExpenseYearFour	11000000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Three FiniteLivedIntangibleAssetsAmortizationExpenseYearThree	11000000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Amortization Expense Year Two FiniteLivedIntangibleAssetsAmortizationExpenseYearTwo	11000000	USD
CY2013Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	275700000	USD
CY2012Q4	us-gaap	Finite Lived Intangible Assets Net FiniteLivedIntangibleAssetsNet	286600000	USD
CY2012	us-gaap	Forward Contract Indexed To Issuers Equity Shares ForwardContractIndexedToIssuersEquityShares	24265000	shares
CY2013	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	0	USD
CY2011	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	0	USD
CY2012	us-gaap	Gain Loss On Cash Flow Hedge Ineffectiveness Net GainLossOnCashFlowHedgeIneffectivenessNet	0	USD
CY2012	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	4100000	USD
CY2013	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	17600000	USD
CY2011	us-gaap	Gain Loss On Sale Of Property Plant Equipment GainLossOnSaleOfPropertyPlantEquipment	-100000	USD
CY2013	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2011	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	-53900000	USD
CY2012	us-gaap	Gains Losses On Extinguishment Of Debt GainsLossesOnExtinguishmentOfDebt	0	USD
CY2013	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	2226300000	USD
CY2012	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	1959800000	USD
CY2011	us-gaap	Gas Domestic Regulated Revenue GasDomesticRegulatedRevenue	2917900000	USD
CY2013Q4	us-gaap	Goodwill Goodwill	3666200000	USD
CY2012Q4	us-gaap	Goodwill Goodwill	3677300000	USD
CY2013	us-gaap	Gross Profit GrossProfit	3841800000	USD
CY2011	us-gaap	Gross Profit GrossProfit	3447500000	USD
CY2012	us-gaap	Gross Profit GrossProfit	3514000000	USD
CY2013Q4	us-gaap	Guarantee Obligations Maximum Exposure GuaranteeObligationsMaximumExposure	8589800000	USD
CY2013	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2012	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2011	us-gaap	Impairment Of Investments ImpairmentOfInvestments	0	USD
CY2011	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	309600000	USD
CY2012	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	408800000	USD
CY2013	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	490900000	USD
CY2013Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	153000000	USD
CY2012Q4	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	132100000	USD
CY2013Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	49500000	USD
CY2013Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	216000000	USD
CY2013Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	72400000	USD
CY2012Q1	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	193600000	USD
CY2012Q2	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	66500000	USD
CY2012Q3	us-gaap	Income Loss From Continuing Operations IncomeLossFromContinuingOperations	16600000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	476300000	USD
CY2012	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	623500000	USD
CY2013	us-gaap	Income Loss From Continuing Operations Before Income Taxes Domestic IncomeLossFromContinuingOperationsBeforeIncomeTaxesDomestic	752800000	USD
CY2011	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.10
CY2013	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.57
CY2012	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	1.40
CY2012Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.42
CY2012Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.68
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.69
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.24
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.23
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.05
CY2013Q3	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.16
CY2013Q4	us-gaap	Income Loss From Continuing Operations Per Basic Share IncomeLossFromContinuingOperationsPerBasicShare	0.49
CY2013	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.57
CY2011	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.07
CY2013Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.16
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.03
CY2012	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	1.36
CY2013Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.23
CY2013Q4	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.49
CY2013Q1	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.69
CY2012Q2	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.22
CY2012Q3	us-gaap	Income Loss From Continuing Operations Per Diluted Share IncomeLossFromContinuingOperationsPerDilutedShare	0.05
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
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	6300000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-10500000	USD
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	7300000	USD
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2900000	USD
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	2700000	USD
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-200000	USD
CY2013Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-1200000	USD
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	44500000	USD
CY2013Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-1400000	USD
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	-700000	USD
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Attributable To Reporting Entity IncomeLossFromDiscontinuedOperationsNetOfTaxAttributableToReportingEntity	1900000	USD
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.04
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.13
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2013Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	-0.01
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2012Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2013Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.00
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.14
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Basic Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerBasicShare	0.01
CY2013	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.13
CY2011	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.04
CY2012	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.03
CY2013Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.14
CY2013Q3	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
CY2013Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	-0.01
CY2012Q3	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2013Q2	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2012Q1	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.00
CY2012Q4	us-gaap	Income Loss From Discontinued Operations Net Of Tax Per Diluted Share IncomeLossFromDiscontinuedOperationsNetOfTaxPerDilutedShare	0.01
CY2012	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	32200000	USD
CY2011	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	14600000	USD
CY2013	us-gaap	Income Loss From Equity Method Investments IncomeLossFromEquityMethodInvestments	35900000	USD
CY2012	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	214700000	USD
CY2013	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	261900000	USD
CY2011	us-gaap	Income Tax Expense Benefit IncomeTaxExpenseBenefit	166700000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	3200000	USD
CY2012	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	3400000	USD
CY2013	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	3600000	USD
CY2011	us-gaap	Income Tax Rate Reconciliation Deductions Employee Stock Ownership Plan Dividends IncomeTaxRateReconciliationDeductionsEmployeeStockOwnershipPlanDividends	3100000	USD
CY2013Q1	us-gaap	Income Tax Receivable IncomeTaxReceivable	15900000	USD
CY2011	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	166700000	USD
CY2012	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	218300000	USD
CY2013	us-gaap	Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate	263500000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	2500000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense IncomeTaxReconciliationNondeductibleExpense	1900000	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
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense Amortization IncomeTaxReconciliationNondeductibleExpenseAmortization	-3900000	USD
CY2012	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-6100000	USD
CY2013	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	300000	USD
CY2011	us-gaap	Income Tax Reconciliation Nondeductible Expense Depreciation IncomeTaxReconciliationNondeductibleExpenseDepreciation	-8200000	USD
CY2011	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-6100000	USD
CY2013	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-1600000	USD
CY2012	us-gaap	Income Tax Reconciliation Other Adjustments IncomeTaxReconciliationOtherAdjustments	-4700000	USD
CY2012	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	15900000	USD
CY2011	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	20300000	USD
CY2013	us-gaap	Income Tax Reconciliation State And Local Income Taxes IncomeTaxReconciliationStateAndLocalIncomeTaxes	10500000	USD
CY2011	us-gaap	Income Taxes Paid IncomeTaxesPaid	9300000	USD
CY2013	us-gaap	Income Taxes Paid IncomeTaxesPaid	10400000	USD
CY2012	us-gaap	Income Taxes Paid IncomeTaxesPaid	8200000	USD
CY2012Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	130900000	USD
CY2013Q4	us-gaap	Income Taxes Receivable IncomeTaxesReceivable	5100000	USD
CY2013	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	67800000	USD
CY2012	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	57300000	USD
CY2011	us-gaap	Increase Decrease In Accounts Payable IncreaseDecreaseInAccountsPayable	-154800000	USD
CY2012	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	51400000	USD
CY2011	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	-219500000	USD
CY2013	us-gaap	Increase Decrease In Accounts Receivable IncreaseDecreaseInAccountsReceivable	94800000	USD
CY2012	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	-43900000	USD
CY2011	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	-2300000	USD
CY2012	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	4900000	USD
CY2012	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	130000000	USD
CY2013	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	3800000	USD
CY2012	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	21800000	USD
CY2011	us-gaap	Increase Decrease In Interest Payable Net IncreaseDecreaseInInterestPayableNet	-2500000	USD
CY2012	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	-62400000	USD
CY2011	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	141700000	USD
CY2013	us-gaap	Increase Decrease In Inventories IncreaseDecreaseInInventories	9200000	USD
CY2011Q1	us-gaap	Increase Decrease In Long Term Receivables Current IncreaseDecreaseInLongTermReceivablesCurrent	3300000	USD
CY2011	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	-3400000	USD
CY2013	us-gaap	Increase Decrease In Customer Deposits IncreaseDecreaseInCustomerDeposits	-6900000	USD
CY2013	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-8600000	USD
CY2012	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	51100000	USD
CY2011	us-gaap	Increase Decrease In Deferred Gas Cost IncreaseDecreaseInDeferredGasCost	-127500000	USD
CY2013	us-gaap	Increase Decrease In Deferred Liabilities IncreaseDecreaseInDeferredLiabilities	10500000	USD
CY2013	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-549100000	USD
CY2012	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	123000000	USD
CY2011	us-gaap	Increase Decrease In Employee Related Liabilities IncreaseDecreaseInEmployeeRelatedLiabilities	-92700000	USD
CY2011Q2	us-gaap	Increase Decrease In Income Taxes IncreaseDecreaseInIncomeTaxes	6800000	USD
CY2011	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-98100000	USD
CY2013	us-gaap	Increase Decrease In Income Taxes Receivable IncreaseDecreaseInIncomeTaxesReceivable	-125900000	USD
CY2013	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-9500000	USD
CY2011	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	82000000	USD
CY2012	us-gaap	Increase Decrease In Other Operating Liabilities IncreaseDecreaseInOtherOperatingLiabilities	-14100000	USD
CY2013	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	2600000	USD
CY2012	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	21900000	USD
CY2011	us-gaap	Increase Decrease In Property And Other Taxes Payable IncreaseDecreaseInPropertyAndOtherTaxesPayable	-15800000	USD
CY2011	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	322900000	USD
CY2012	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	51700000	USD
CY2013	us-gaap	Increase Decrease In Regulatory Assets And Liabilities IncreaseDecreaseInRegulatoryAssetsAndLiabilities	-479100000	USD
CY2011	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-42300000	USD
CY2013	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-38700000	USD
CY2012	us-gaap	Increase Decrease In Restricted Cash IncreaseDecreaseInRestrictedCash	-114200000	USD
CY2011	us-gaap	Increase Decrease In Risk Management Assets And Liabilities IncreaseDecreaseInRiskManagementAssetsAndLiabilities	-2600000	USD
CY2013	us-gaap	Increase Decrease In Risk Management Assets And Liabilities IncreaseDecreaseInRiskManagementAssetsAndLiabilities	-2600000	USD
CY2012	us-gaap	Increase Decrease In Risk Management Assets And Liabilities IncreaseDecreaseInRiskManagementAssetsAndLiabilities	-2500000	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
CY2013	us-gaap	Incremental Common Shares Attributable To Contingently Issuable Shares IncrementalCommonSharesAttributableToContingentlyIssuableShares	708000	shares
CY2013	us-gaap	Incremental Common Shares Attributable To Equity Forward Agreements IncrementalCommonSharesAttributableToEquityForwardAgreements	0	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
CY2013	us-gaap	Incremental Common Shares Attributable To Share Based Payment Arrangements IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	456000	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
CY2013Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	577700000	USD
CY2012Q4	us-gaap	Investments And Other Noncurrent Assets InvestmentsAndOtherNoncurrentAssets	437700000	USD
CY2012Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	286600000	USD
CY2013Q4	us-gaap	Intangible Assets Net Excluding Goodwill IntangibleAssetsNetExcludingGoodwill	275700000	USD
CY2011	us-gaap	Interest Expense InterestExpense	376800000	USD
CY2012	us-gaap	Interest Expense InterestExpense	418300000	USD
CY2013	us-gaap	Interest Expense InterestExpense	414800000	USD
CY2012	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	398200000	USD
CY2011	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	362900000	USD
CY2013	us-gaap	Interest Expense Long Term Debt InterestExpenseLongTermDebt	408500000	USD
CY2012	us-gaap	Interest Expense Other InterestExpenseOther	9500000	USD
CY2011	us-gaap	Interest Expense Other InterestExpenseOther	-7400000	USD
CY2013	us-gaap	Interest Expense Other InterestExpenseOther	6200000	USD
CY2013	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	2700000	USD
CY2012	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	6700000	USD
CY2011	us-gaap	Interest Expense Short Term Borrowings InterestExpenseShortTermBorrowings	13500000	USD
CY2012	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	5200000	USD
CY2013	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	3600000	USD
CY2011	us-gaap	Interest Income Expense Nonoperating Net InterestIncomeExpenseNonoperatingNet	4400000	USD
CY2013Q4	us-gaap	Interest Payable Current InterestPayableCurrent	136400000	USD
CY2012Q4	us-gaap	Interest Payable Current InterestPayableCurrent	133700000	USD
CY2012Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	97400000	USD
CY2013Q4	us-gaap	Inventory Raw Materials And Supplies InventoryRawMaterialsAndSupplies	101200000	USD
CY2012Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	48400000	USD
CY2013Q4	us-gaap	Lifo Inventory Amount LIFOInventoryAmount	45500000	USD
CY2012Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	21844700000	USD
CY2012Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	243300000	USD
CY2013Q4	us-gaap	Investments In Affiliates Subsidiaries Associates And Joint Ventures InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures	373700000	USD
CY2013Q4	us-gaap	Liabilities And Stockholders Equity LiabilitiesAndStockholdersEquity	22653900000	USD
CY2012Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3319300000	USD
CY2013Q4	us-gaap	Liabilities Current LiabilitiesCurrent	3178400000	USD
CY2012Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	6152000000	USD
CY2013Q4	us-gaap	Liabilities Noncurrent LiabilitiesNoncurrent	5995700000	USD
CY2013Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation LiabilitiesOfDisposalGroupIncludingDiscontinuedOperation	108600000	USD
CY2012Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	108600000	USD
CY2013Q4	us-gaap	Liabilities Of Disposal Group Including Discontinued Operation Current LiabilitiesOfDisposalGroupIncludingDiscontinuedOperationCurrent	0	USD
CY2012Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	44000000	USD
CY2013Q4	us-gaap	Line Of Credit Facility Amount Outstanding LineOfCreditFacilityAmountOutstanding	0	USD
	us-gaap	Line Of Credit Facility Expiration Date1 LineOfCreditFacilityExpirationDate1	2018-09-28
CY2013Q4	us-gaap	Long Term Debt LongTermDebt	8189000000	USD
CY2013Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	7593200000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations LongTermDebtAndCapitalLeaseObligations	6819100000	USD
CY2012Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	507200000	USD
CY2013Q4	us-gaap	Long Term Debt And Capital Lease Obligations Current LongTermDebtAndCapitalLeaseObligationsCurrent	542100000	USD
CY2013Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	8697300000	USD
CY2012Q4	us-gaap	Long Term Debt Fair Value LongTermDebtFairValue	8389000000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal After Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive	5219900000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Next Twelve Months LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths	542100000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Five LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive	808700000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Four LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour	597800000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Three LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree	755000000	USD
CY2013Q4	us-gaap	Long Term Debt Maturities Repayments Of Principal In Year Two LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo	265500000	USD
CY2013Q4	us-gaap	Longterm Debt Percentage Bearing Fixed Interest Amount LongtermDebtPercentageBearingFixedInterestAmount	7700000000	USD
CY2013Q4	us-gaap	Longterm Debt Percentage Bearing Variable Interest Amount LongtermDebtPercentageBearingVariableInterestAmount	500000000	USD
CY2012Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	45700000	USD
CY2013Q4	us-gaap	Margin Deposit Assets MarginDepositAssets	5900000	USD
CY2013Q4	us-gaap	Minority Interest Ownership Percentage By Parent MinorityInterestOwnershipPercentageByParent	0.475
CY2011	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	1354600000	USD
CY2013	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	1643200000	USD
CY2012	us-gaap	Natural Gas Midstream Revenue NaturalGasMidstreamRevenue	1462400000	USD
CY2012	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	35500000	USD
CY2011	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	16000000	USD
CY2013	us-gaap	Net Cash Provided By Used In Continuing Operations NetCashProvidedByUsedInContinuingOperations	-138200000	USD
CY2013	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	128700000	USD
CY2012	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-10700000	USD
CY2011	us-gaap	Net Cash Provided By Used In Discontinued Operations NetCashProvidedByUsedInDiscontinuedOperations	-13700000	USD
CY2011	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	281400000	USD
CY2013	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	445100000	USD
CY2012	us-gaap	Net Cash Provided By Used In Financing Activities NetCashProvidedByUsedInFinancingActivities	174500000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1891400000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1149300000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities NetCashProvidedByUsedInInvestingActivities	-1425200000	USD
CY2013	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-2010100000	USD
CY2011	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1146800000	USD
CY2012	us-gaap	Net Cash Provided By Used In Investing Activities Continuing Operations NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	-1421900000	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
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities NetCashProvidedByUsedInOperatingActivities	1436800000	USD
CY2011	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	881400000	USD
CY2013	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1426800000	USD
CY2012	us-gaap	Net Cash Provided By Used In Operating Activities Continuing Operations NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	1282900000	USD
CY2013	us-gaap	Net Income Loss NetIncomeLoss	532100000	USD
CY2011	us-gaap	Net Income Loss NetIncomeLoss	299100000	USD
CY2012	us-gaap	Net Income Loss NetIncomeLoss	416100000	USD
CY2013Q3	us-gaap	Net Income Loss NetIncomeLoss	48100000	USD
CY2012Q2	us-gaap	Net Income Loss NetIncomeLoss	69400000	USD
CY2013Q1	us-gaap	Net Income Loss NetIncomeLoss	260500000	USD
CY2012Q3	us-gaap	Net Income Loss NetIncomeLoss	19300000	USD
CY2012Q1	us-gaap	Net Income Loss NetIncomeLoss	193400000	USD
CY2013Q4	us-gaap	Net Income Loss NetIncomeLoss	151800000	USD
CY2012Q4	us-gaap	Net Income Loss NetIncomeLoss	134000000	USD
CY2013Q2	us-gaap	Net Income Loss NetIncomeLoss	71700000	USD
CY2012	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-416600000	USD
CY2011	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-438100000	USD
CY2013	us-gaap	Nonoperating Income Expense NonoperatingIncomeExpense	-390600000	USD
CY2011	us-gaap	Operating Expenses OperatingExpenses	2547700000	USD
CY2012	us-gaap	Operating Expenses OperatingExpenses	2506100000	USD
CY2013	us-gaap	Operating Expenses OperatingExpenses	2734300000	USD
CY2012	us-gaap	Operating Income Loss OperatingIncomeLoss	1040100000	USD
CY2011	us-gaap	Operating Income Loss OperatingIncomeLoss	914400000	USD
CY2013	us-gaap	Operating Income Loss OperatingIncomeLoss	1143400000	USD
CY2013Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	344100000	USD
CY2012Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	202400000	USD
CY2013Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	428900000	USD
CY2013Q2	us-gaap	Operating Income Loss OperatingIncomeLoss	194000000	USD
CY2012Q1	us-gaap	Operating Income Loss OperatingIncomeLoss	399600000	USD
CY2013Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	176400000	USD
CY2012Q3	us-gaap	Operating Income Loss OperatingIncomeLoss	131500000	USD
CY2012Q4	us-gaap	Operating Income Loss OperatingIncomeLoss	306600000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due OperatingLeasesFutureMinimumPaymentsDue	75400000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Current OperatingLeasesFutureMinimumPaymentsDueCurrent	21400000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Five Years OperatingLeasesFutureMinimumPaymentsDueInFiveYears	6600000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Four Years OperatingLeasesFutureMinimumPaymentsDueInFourYears	8300000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Three Years OperatingLeasesFutureMinimumPaymentsDueInThreeYears	10800000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due In Two Years OperatingLeasesFutureMinimumPaymentsDueInTwoYears	14200000	USD
CY2013Q4	us-gaap	Operating Leases Future Minimum Payments Due Thereafter OperatingLeasesFutureMinimumPaymentsDueThereafter	14100000	USD
CY2012	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	50900000	USD
CY2011	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	52900000	USD
CY2013	us-gaap	Operating Leases Rent Expense Net OperatingLeasesRentExpenseNet	56300000	USD
CY2013Q1	us-gaap	Operating Loss Carryforwards OperatingLossCarryforwards	600000	USD
CY2013Q4	us-gaap	Other Assets Current OtherAssetsCurrent	330600000	USD
CY2012Q4	us-gaap	Other Assets Current OtherAssetsCurrent	357200000	USD
CY2013Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	5551900000	USD
CY2012Q4	us-gaap	Other Assets Noncurrent OtherAssetsNoncurrent	6123400000	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
CY2013	us-gaap	Other Comprehensive Income Loss Available For Sale Securities Adjustment Net Of Tax OtherComprehensiveIncomeLossAvailableForSaleSecuritiesAdjustmentNetOfTax	-2900000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	15500000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-4500000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Before Reclassifications Net Of Tax OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax	-11300000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	3000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	2800000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Derivatives Qualifying As Hedges Net Of Tax OtherComprehensiveIncomeLossDerivativesQualifyingAsHedgesNetOfTax	3200000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-1800000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	21900000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax OtherComprehensiveIncomeLossNetOfTax	-5800000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-5800000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	-1800000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent	21900000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	6700000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	-22000000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax	6000000	USD
CY2013	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	14300000	USD
CY2012	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	-4200000	USD
CY2011	us-gaap	Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax	3700000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	-1100000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	1800000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Gain Loss On Derivatives Arising During Period Tax OtherComprehensiveIncomeUnrealizedGainLossOnDerivativesArisingDuringPeriodTax	2100000	USD
CY2011	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	700000	USD
CY2013	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1500000	USD
CY2012	us-gaap	Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Tax OtherComprehensiveIncomeUnrealizedHoldingGainLossOnSecuritiesArisingDuringPeriodTax	-1700000	USD
CY2012Q4	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	84100000	USD
CY2013Q4	us-gaap	Other Deferred Credits Noncurrent OtherDeferredCreditsNoncurrent	91900000	USD
CY2013Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	327600000	USD
CY2012Q4	us-gaap	Other Liabilities Current OtherLiabilitiesCurrent	309700000	USD
CY2012Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	226200000	USD
CY2013Q4	us-gaap	Other Liabilities Noncurrent OtherLiabilitiesNoncurrent	216000000	USD
CY2012Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	194400000	USD
CY2013Q4	us-gaap	Other Long Term Investments OtherLongTermInvestments	204000000	USD
CY2013	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	2100000	USD
CY2012	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-14100000	USD
CY2011	us-gaap	Other Nonoperating Income OtherNonoperatingIncome	-14200000	USD
CY2013	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	24200000	USD
CY2011	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	-7400000	USD
CY2012	us-gaap	Other Nonoperating Income Expense OtherNonoperatingIncomeExpense	1700000	USD
CY2012	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	101000000	USD
CY2011	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	50800000	USD
CY2013	us-gaap	Other Sales Revenue Net OtherSalesRevenueNet	224400000	USD
CY2011	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	69400000	USD
CY2013	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	67900000	USD
CY2012	us-gaap	Payments For Proceeds From Other Investing Activities PaymentsForProceedsFromOtherInvestingActivities	49000000	USD
CY2012	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	10000000	USD
CY2011	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	3100000	USD
CY2013	us-gaap	Payments For Repurchase Of Common Stock PaymentsForRepurchaseOfCommonStock	8100000	USD
CY2013	us-gaap	Payments Of Dividends Common Stock PaymentsOfDividendsCommonStock	305900000	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
CY2013	us-gaap	Payments To Acquire Property Plant And Equipment PaymentsToAcquirePropertyPlantAndEquipment	1879900000	USD
CY2013Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	527500000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement And Postemployment Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementAndPostemploymentBenefitPlansLiabilitiesNoncurrent	1107300000	USD
CY2013Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	-259300000	USD
CY2012Q4	us-gaap	Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent	-461800000	USD
CY2013Q4	us-gaap	Preferred Stock Par Or Stated Value Per Share PreferredStockParOrStatedValuePerShare	0.01
CY2013Q4	us-gaap	Preferred Stock Shares Authorized PreferredStockSharesAuthorized	20000000	shares
CY2013Q4	us-gaap	Preferred Stock Shares Outstanding PreferredStockSharesOutstanding	0	shares
CY2013	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	6400000	USD
CY2012	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	6500000	USD
CY2011	us-gaap	Proceeds From Insurance Settlement Investing Activities ProceedsFromInsuranceSettlementInvestingActivities	0	USD
CY2013	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	43700000	USD
CY2011	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	24400000	USD
CY2012	us-gaap	Proceeds From Issuance Of Common Stock ProceedsFromIssuanceOfCommonStock	383500000	USD
CY2011	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	890000000	USD
CY2013	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	1307600000	USD
CY2012	us-gaap	Proceeds From Issuance Of Long Term Debt ProceedsFromIssuanceOfLongTermDebt	991400000	USD
CY2012	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3400000	USD
CY2013	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-3200000	USD
CY2011	us-gaap	Proceeds From Payments For Other Financing Activities ProceedsFromPaymentsForOtherFinancingActivities	-62100000	USD
CY2011	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-23100000	USD
CY2013	us-gaap	Proceeds From Repayments Of Short Term Debt ProceedsFromRepaymentsOfShortTermDebt	-78100000	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
CY2013	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	18000000	USD
CY2011	us-gaap	Proceeds From Sale Of Productive Assets ProceedsFromSaleOfProductiveAssets	9400000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	23664200000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Gross PropertyPlantAndEquipmentGross	21940900000	USD
CY2013Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	14365100000	USD
CY2012Q4	us-gaap	Property Plant And Equipment Net PropertyPlantAndEquipmentNet	12915900000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	2400000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	18500000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Additions PublicUtilitiesAllowanceForFundsUsedDuringConstructionAdditions	10600000	USD
CY2012	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-10600000	USD
CY2011	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-2400000	USD
CY2013	us-gaap	Public Utilities Allowance For Funds Used During Construction Capitalized Interest PublicUtilitiesAllowanceForFundsUsedDuringConstructionCapitalizedInterest	-18500000	USD
CY2013Q4	us-gaap	Public Utilities Property Plant And Equipment Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentAccumulatedDepreciation	9256500000	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
CY2013Q4	us-gaap	Public Utilities Property Plant And Equipment Net PublicUtilitiesPropertyPlantAndEquipmentNet	14365100000	USD
CY2012Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	21642300000	USD
CY2013Q4	us-gaap	Public Utilities Property Plant And Equipment Plant In Service PublicUtilitiesPropertyPlantAndEquipmentPlantInService	23303700000	USD
CY2012Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	162800000	USD
CY2012	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	5500000	USD
CY2011	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	2700000	USD
CY2013	us-gaap	Reclassification From Accumulated Other Comprehensive Income Current Period Net Of Tax ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax	6400000	USD
CY2011	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	-2200000	USD
CY2012	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	8300000	USD
CY2013	us-gaap	Recognition Of Deferred Revenue RecognitionOfDeferredRevenue	7200000	USD
CY2012Q4	us-gaap	Regulatory Assets RegulatoryAssets	2232200000	USD
CY2013Q4	us-gaap	Regulatory Assets RegulatoryAssets	1711400000	USD
CY2013Q4	us-gaap	Regulatory Assets Current RegulatoryAssetsCurrent	142800000	USD
CY2012Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	2024400000	USD
CY2013Q4	us-gaap	Regulatory Assets Noncurrent RegulatoryAssetsNoncurrent	1522200000	USD
CY2012Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1787000000	USD
CY2013Q4	us-gaap	Regulatory Liabilities RegulatoryLiabilities	1762200000	USD
CY2013Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	60200000	USD
CY2012Q4	us-gaap	Regulatory Liability Current RegulatoryLiabilityCurrent	171600000	USD
CY2013Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1669800000	USD
CY2012Q4	us-gaap	Regulatory Liability Noncurrent RegulatoryLiabilityNoncurrent	1593300000	USD
CY2013	us-gaap	Remaining Recovery Period Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided1 RemainingRecoveryPeriodOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided1	P41Y
CY2013	us-gaap	Repayments Of Accounts Receivable Securitization RepaymentsOfAccountsReceivableSecuritization	-2700000	USD
CY2012	us-gaap	Repayments Of Accounts Receivable Securitization RepaymentsOfAccountsReceivableSecuritization	-3200000	USD
CY2011	us-gaap	Repayments Of Accounts Receivable Securitization RepaymentsOfAccountsReceivableSecuritization	-3800000	USD
CY2011	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	286900000	USD
CY2013	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	510900000	USD
CY2012	us-gaap	Repayments Of Long Term Debt And Capital Securities RepaymentsOfLongTermDebtAndCapitalSecurities	331600000	USD
CY2013Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	8000000	USD
CY2012Q4	us-gaap	Restricted Cash And Cash Equivalents RestrictedCashAndCashEquivalents	46800000	USD
CY2013Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1285500000	USD
CY2012Q4	us-gaap	Retained Earnings Accumulated Deficit RetainedEarningsAccumulatedDeficit	1059600000	USD
CY2013	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;">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 conveyances related to pooling of assets (production rights) in a joint undertaking intended to find, develop, or produce oil or gas from a particular property or group of properties. NiSource has a working and an overriding royalty interest in the assets. The gain was initially deferred as NiSource has a substantial obligation for future performance. NiSource recognizes the gain on conveyances into earnings as the obligation is satisfied ($7.3 million in 2013). As of December 31, 2013, remaining gains of approximately $30.0 million were deferred pending performance of future obligations.</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	Revenues Revenues	5751000000	USD
CY2013	us-gaap	Revenues Revenues	5657300000	USD
CY2012	us-gaap	Revenues Revenues	5030900000	USD
CY2011	us-gaap	Sales Revenue Net SalesRevenueNet	5751000000	USD
CY2012	us-gaap	Sales Revenue Net SalesRevenueNet	5030900000	USD
CY2013	us-gaap	Sales Revenue Net SalesRevenueNet	5657300000	USD
CY2012Q3	us-gaap	Sales Revenue Net SalesRevenueNet	956200000	USD
CY2012Q2	us-gaap	Sales Revenue Net SalesRevenueNet	1031200000	USD
CY2013Q2	us-gaap	Sales Revenue Net SalesRevenueNet	1201500000	USD
CY2012Q4	us-gaap	Sales Revenue Net SalesRevenueNet	1393600000	USD
CY2013Q3	us-gaap	Sales Revenue Net SalesRevenueNet	1076800000	USD
CY2013Q4	us-gaap	Sales Revenue Net SalesRevenueNet	1596800000	USD
CY2013Q1	us-gaap	Sales Revenue Net SalesRevenueNet	1782200000	USD
CY2012Q1	us-gaap	Sales Revenue Net SalesRevenueNet	1649900000	USD
CY2012	us-gaap	Share Based Compensation ShareBasedCompensation	45000000	USD
CY2013	us-gaap	Share Based Compensation ShareBasedCompensation	50700000	USD
CY2011	us-gaap	Share Based Compensation ShareBasedCompensation	39200000	USD
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized	6733397	shares
CY2010Q2	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Available For Grant ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant	8000000	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber	409218	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Exercisable Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice	22.53
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod	-1000	shares
CY2013	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Grants In Period ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod	0	shares
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	1558436	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Number ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber	409218	shares
CY2013Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.53
CY2012Q4	us-gaap	Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Weighted Average Exercise Price ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice	22.21
CY2013	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Exercises In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice	22.10
CY2013	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Forfeitures In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice	19.75
CY2013	us-gaap	Share Based Compensation Arrangements By Share Based Payment Award Options Grants In Period Weighted Average Exercise Price ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsGrantsInPeriodWeightedAverageExercisePrice	0.00
CY2013Q4	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Exercisable Intrinsic Value1 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1	4200000	USD
CY2013	us-gaap	Sharebased Compensation Arrangement By Sharebased Payment Award Options Outstanding Weighted Average Remaining Contractual Term2 SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsOutstandingWeightedAverageRemainingContractualTerm2	P1Y2M
CY2011Q4	us-gaap	Shares Issued SharesIssued	281854000000	shares
CY2013Q4	us-gaap	Shares Issued SharesIssued	313676000000	shares
CY2010Q4	us-gaap	Shares Issued SharesIssued	278855000000	shares
CY2012Q4	us-gaap	Shares Issued SharesIssued	310281000000	shares
CY2013Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	698700000	USD
CY2012Q4	us-gaap	Short Term Borrowings ShortTermBorrowings	776900000	USD
CY2013Q1	us-gaap	Short Term Borrowings ShortTermBorrowings	1131200000	USD
CY2013Q2	us-gaap	Short Term Borrowings ShortTermBorrowings	377700000	USD
CY2013Q3	us-gaap	Short Term Borrowings ShortTermBorrowings	820800000	USD
CY2010Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	107400000	USD
CY2011Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	80900000	USD
CY2012Q4	us-gaap	Significant Change In Unrecognized Tax Benefits Is Reasonably Possible Amount Of Unrecorded Benefit SignificantChangeInUnrecognizedTaxBenefitsIsReasonablyPossibleAmountOfUnrecordedBenefit	20500000	USD
CY2012	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	340000000	shares
CY2013	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	272000000	shares
CY2011	us-gaap	Stock Issued During Period Shares Dividend Reinvestment Plan StockIssuedDuringPeriodSharesDividendReinvestmentPlan	439000000	shares
CY2011	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	67000000	shares
CY2013	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	102000000	shares
CY2012	us-gaap	Stock Issued During Period Shares Employee Stock Purchase Plans StockIssuedDuringPeriodSharesEmployeeStockPurchasePlans	73000000	shares
CY2011	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	1064000000	shares
CY2013	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	2037000000	shares
CY2012	us-gaap	Stock Issued During Period Shares Share Based Compensation StockIssuedDuringPeriodSharesShareBasedCompensation	2692000000	shares
CY2013	us-gaap	Stock Issued During Period Shares Stock Options Exercised StockIssuedDuringPeriodSharesStockOptionsExercised	-1148218	shares
CY2012	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	8300000	USD
CY2011	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	8900000	USD
CY2013	us-gaap	Stock Issued During Period Value Dividend Reinvestment Plan StockIssuedDuringPeriodValueDividendReinvestmentPlan	8000000	USD
CY2011	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1300000	USD
CY2012	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	1800000	USD
CY2013	us-gaap	Stock Issued During Period Value Employee Stock Purchase Plan StockIssuedDuringPeriodValueEmployeeStockPurchasePlan	2900000	USD
CY2012	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	300000	USD
CY2013	us-gaap	Stock Issued During Period Value New Issues StockIssuedDuringPeriodValueNewIssues	100000	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
CY2013	us-gaap	Stock Issued During Period Value Share Based Compensation StockIssuedDuringPeriodValueShareBasedCompensation	43800000	USD
CY2012Q4	us-gaap	Stockholders Equity StockholdersEquity	5554300000	USD
CY2013Q4	us-gaap	Stockholders Equity StockholdersEquity	5886600000	USD
CY2011Q4	us-gaap	Stockholders Equity StockholdersEquity	4997300000	USD
CY2010Q4	us-gaap	Stockholders Equity StockholdersEquity	4897500000	USD
CY2013	us-gaap	Tax Credit Carryforward Expiration Date TaxCreditCarryforwardExpirationDate	2033-12-31
CY2013	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	300600000	USD
CY2011	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	293100000	USD
CY2012	us-gaap	Taxes Excluding Income And Excise Taxes TaxesExcludingIncomeAndExciseTaxes	287700000	USD
CY2012Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	235500000	USD
CY2013Q4	us-gaap	Taxes Payable Current TaxesPayableCurrent	254800000	USD
CY2013Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	265100000	USD
CY2012Q4	us-gaap	Transfers Accounted For As Secured Borrowings Associated Liabilities Carrying Amount TransfersAccountedForAsSecuredBorrowingsAssociatedLiabilitiesCarryingAmount	233300000	USD
CY2013	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	-297000000	shares
CY2011	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	-165000000	shares
CY2012	us-gaap	Treasury Stock Shares Acquired TreasuryStockSharesAcquired	-439000000	shares
CY2012Q4	us-gaap	Treasury Stock Value TreasuryStockValue	40500000	USD
CY2013Q4	us-gaap	Treasury Stock Value TreasuryStockValue	48600000	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
CY2013	us-gaap	Treasury Stock Value Acquired Cost Method TreasuryStockValueAcquiredCostMethod	-8100000	USD
CY2012Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	285700000	USD
CY2013Q4	us-gaap	Unbilled Receivables Current UnbilledReceivablesCurrent	321500000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	23800000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	28500000	USD
CY2010Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	129200000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits UnrecognizedTaxBenefits	105300000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-85400000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-21400000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions	-29600000	USD
CY2013Q4	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
CY2013	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	800000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Income Tax Penalties And Interest Expense UnrecognizedTaxBenefitsIncomeTaxPenaltiesAndInterestExpense	100000	USD
CY2011	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	0	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions	15100000	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 Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	5700000	USD
CY2012	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	200000	USD
CY2013	us-gaap	Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions	1600000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	700000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	100000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Interest On Income Taxes Accrued UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued	900000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits Resulting In Net Operating Loss Carryforward UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward	23000000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits Resulting In Net Operating Loss Carryforward UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward	10200000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits Resulting In Net Operating Loss Carryforward UnrecognizedTaxBenefitsResultingInNetOperatingLossCarryforward	13300000	USD
CY2013Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	4000000	USD
CY2011Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2400000	USD
CY2012Q4	us-gaap	Unrecognized Tax Benefits That Would Impact Effective Tax Rate UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate	2200000	USD
CY2013	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;">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>
CY2012	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1660300000	USD
CY2011	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1702100000	USD
CY2013	us-gaap	Utilities Operating Expense Maintenance And Operations UtilitiesOperatingExpenseMaintenanceAndOperations	1873900000	USD
CY2013Q3	us-gaap	Valuation Allowance Deferred Tax Asset Change In Amount ValuationAllowanceDeferredTaxAssetChangeInAmount	1200000	USD
CY2013Q4	us-gaap	Weighted Average Cost Inventory Amount WeightedAverageCostInventoryAmount	309100000	USD
CY2012Q4	us-gaap	Weighted Average Cost Inventory Amount WeightedAverageCostInventoryAmount	278200000	USD
CY2013	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	313646000	shares
CY2012	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	300401000	shares
CY2011	us-gaap	Weighted Average Number Of Diluted Shares Outstanding WeightedAverageNumberOfDilutedSharesOutstanding	288491000	shares
CY2013	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	312402000	shares
CY2012	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	291927000	shares
CY2011	us-gaap	Weighted Average Number Of Shares Outstanding Basic WeightedAverageNumberOfSharesOutstandingBasic	280442000	shares
CY2013Q4	ni	Accelerated Depreciation And Other Property Differences AcceleratedDepreciationAndOtherPropertyDifferences	3811500000	USD
CY2012Q4	ni	Accelerated Depreciation And Other Property Differences AcceleratedDepreciationAndOtherPropertyDifferences	3306600000	USD
CY2013	ni	Accretion Recorded As Regulatory Asset Or Liability AccretionRecordedAsRegulatoryAssetOrLiability	8200000	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
CY2013Q4	ni	Accrued Liability For Postretirement And Postemployment Benefits Current AccruedLiabilityForPostretirementAndPostemploymentBenefitsCurrent	6200000	USD
CY2013	ni	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	-12800000	USD
CY2011	ni	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	-3100000	USD
CY2012	ni	Allowance For Borrowed Funds Used And Interest Capitalized During Construction AllowanceForBorrowedFundsUsedAndInterestCapitalizedDuringConstruction	-7100000	USD
CY2013	ni	Annual Capital Lease Payments Number Of Years AnnualCapitalLeasePaymentsNumberOfYears	P10Y
CY2013	ni	Asset Sale Covenant Percentage Of Consolidated Total Assets AssetSaleCovenantPercentageOfConsolidatedTotalAssets	0.10
CY2013	ni	Cash From Financing Activities Related To Change In Short Term Borrowings Due To Securitization Transactions CashFromFinancingActivitiesRelatedToChangeInShortTermBorrowingsDueToSecuritizationTransactions	31800000	USD
CY2012	ni	Cash From Financing Activities Related To Change In Short Term Borrowings Due To Securitization Transactions CashFromFinancingActivitiesRelatedToChangeInShortTermBorrowingsDueToSecuritizationTransactions	1600000	USD
CY2012	ni	Cash Received Through Forward Contract CashReceivedThroughForwardContract	339100000	USD
CY2012	ni	Change In Income Loss From Discontinued Operations ChangeInIncomeLossFromDiscontinuedOperations	17800000	USD
CY2013	ni	Columbia Transmission Customer Settlement Depreciation Impact ColumbiaTransmissionCustomerSettlementDepreciationImpact	33400000	USD
CY2013	ni	Columbia Transmission Customer Settlement Gross Revenue Impact ColumbiaTransmissionCustomerSettlementGrossRevenueImpact	81700000	USD
CY2012Q4	ni	Expected Benefits To Be Realized ExpectedBenefitsToBeRealized	39400000	USD
CY2012	ni	Contributions To Equity Investees ContributionsToEquityInvestees	20400000	USD
CY2013	ni	Contributions To Equity Investees ContributionsToEquityInvestees	125400000	USD
CY2011	ni	Contributions To Equity Investees ContributionsToEquityInvestees	6400000	USD
CY2012Q4	ni	Cost Of Removal CostOfRemoval	-523400000	USD
CY2013Q4	ni	Cost Of Removal CostOfRemoval	-531600000	USD
CY2013Q4	ni	Cross Default Provision On Default Relating To Any Indebtedness CrossDefaultProvisionOnDefaultRelatingToAnyIndebtedness	50000000	USD
CY2003Q3	ni	Date Of Right To Cancel Swaps DateOfRightToCancelSwaps	2014-07-15
CY2012Q4	ni	Deferred Charges And Other DeferredChargesAndOther	94400000	USD
CY2013Q4	ni	Deferred Charges And Other DeferredChargesAndOther	87300000	USD
CY2013Q4	ni	Deferred Gas Cost Regulatory Asset Not Earning Return On Investment DeferredGasCostRegulatoryAssetNotEarningReturnOnInvestment	985900000	USD
CY2012Q4	ni	Deferred Gas Revenue DeferredGasRevenue	22100000	USD
CY2013Q4	ni	Deferred Gas Revenue DeferredGasRevenue	32200000	USD
CY2012Q4	ni	Deferred Investment Tax Credits And Other Regulatory Liabilities DeferredInvestmentTaxCreditsAndOtherRegulatoryLiabilities	-191500000	USD
CY2013Q4	ni	Deferred Investment Tax Credits And Other Regulatory Liabilities DeferredInvestmentTaxCreditsAndOtherRegulatoryLiabilities	-205400000	USD
CY2012	ni	Defined Benefit Plan Periodic Benefit Cost Capitalized DefinedBenefitPlanPeriodicBenefitCostCapitalized	25100000	USD
CY2013	ni	Defined Benefit Plan Periodic Benefit Cost Capitalized DefinedBenefitPlanPeriodicBenefitCostCapitalized	17000000	USD
CY2003Q3	ni	Derivative Number Of Counterparties In Swap Agreement DerivativeNumberOfCounterpartiesInSwapAgreement	4
CY2005Q3	ni	Derivative Number Of Counterparties In Swap Agreement Settled DerivativeNumberOfCounterpartiesInSwapAgreementSettled	6
CY2012	ni	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	7800000	USD
CY2013	ni	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	7500000	USD
CY2011	ni	Discount On Prepayment Transaction DiscountOnPrepaymentTransaction	7100000	USD
CY2013Q4	ni	Disposal Group Including Discontinued Operation Price Risk Management Assets DisposalGroupIncludingDiscontinuedOperationPriceRiskManagementAssets	107000000	USD
CY2013Q4	ni	Disposal Group Including Discontinued Operation Price Risk Management Liabilities DisposalGroupIncludingDiscontinuedOperationPriceRiskManagementLiabilities	104700000	USD
CY2008Q3	ni	Each Wind Power Purchase Agreement Capacity EachWindPowerPurchaseAgreementCapacity	50	MW
CY2013	ni	Employee Service Share Based Compensation Nonvested Awards Weighted Average Remaining Requisite Service Period EmployeeServiceShareBasedCompensationNonvestedAwardsWeightedAverageRemainingRequisiteServicePeriod	P2Y
CY2012Q4	ni	Environmental Liabilities EnvironmentalLiabilities	-49000000	USD
CY2013Q4	ni	Environmental Liabilities EnvironmentalLiabilities	-51300000	USD
CY2013Q4	ni	Expected Benefits To Be Realized ExpectedBenefitsToBeRealized	39800000	USD
CY2013Q4	ni	Expenses Recovered As Components Of Cost Of Service And Regulatory Orders ExpensesRecoveredAsComponentsOfCostOfServiceAndRegulatoryOrders	1560700000	USD
CY2012Q4	ni	Fair Value Assets Measured On Recurring Basis FairValueAssetsMeasuredOnRecurringBasis	260000000	USD
CY2012Q4	ni	Exchange Gas Payable ExchangeGasPayable	146200000	USD
CY2013Q4	ni	Exchange Gas Payable ExchangeGasPayable	186400000	USD
CY2012Q4	ni	Exchange Gas Receivable ExchangeGasReceivable	51300000	USD
CY2013Q4	ni	Exchange Gas Receivable ExchangeGasReceivable	70600000	USD
CY2013Q4	ni	Fair Value Assets Measured On Recurring Basis FairValueAssetsMeasuredOnRecurringBasis	144600000	USD
CY2012Q4	ni	Fair Value Liabilities Measured On Recurring Basis FairValueLiabilitiesMeasuredOnRecurringBasis	115500000	USD
CY2013Q4	ni	Fair Value Liabilities Measured On Recurring Basis FairValueLiabilitiesMeasuredOnRecurringBasis	1700000	USD
CY2010Q1	ni	Federal And State Income Tax Receivables FederalAndStateIncomeTaxReceivables	25300000	USD
CY2009Q4	ni	Federal And State Income Tax Receivables FederalAndStateIncomeTaxReceivables	295700000	USD
CY2009Q4	ni	Federal And State Income Tax Receivables FederalAndStateIncomeTaxReceivables	263500000	USD
CY2013Q1	ni	Five Year Period Modernization Investment FiveYearPeriodModernizationInvestment	1500000000	USD
CY2013Q4	ni	Gross Amounts Not Offset In Statement Of Financial Position GrossAmountsNotOffsetInStatementOfFinancialPosition	-1700000	USD
CY2012Q4	ni	Gross Amounts Not Offset In Statement Of Financial Position GrossAmountsNotOffsetInStatementOfFinancialPosition	-72700000	USD
CY2013Q4	ni	Gross Amounts Not Offset In Statement Of Financial Position Liabilities GrossAmountsNotOffsetInStatementOfFinancialPositionLiabilities	1700000	USD
CY2012Q4	ni	Gross Amounts Not Offset In Statement Of Financial Position Liabilities GrossAmountsNotOffsetInStatementOfFinancialPositionLiabilities	72700000	USD
CY2013Q4	ni	Gross Amounts Of Recognized Assets GrossAmountsOfRecognizedAssets	23200000	USD
CY2012Q4	ni	Gross Amounts Of Recognized Assets GrossAmountsOfRecognizedAssets	148200000	USD
CY2013Q4	ni	Gross Amounts Of Recognized Liabilities GrossAmountsOfRecognizedLiabilities	-1700000	USD
CY2012Q4	ni	Gross Amounts Of Recognized Liabilities GrossAmountsOfRecognizedLiabilities	-115500000	USD
CY2013Q4	ni	Gross Amounts Offset In Statement Of Financial Position Assets GrossAmountsOffsetInStatementOfFinancialPositionAssets	0	USD
CY2012Q4	ni	Gross Amounts Offset In Statement Of Financial Position Assets GrossAmountsOffsetInStatementOfFinancialPositionAssets	0	USD
CY2013Q4	ni	Gross Amounts Offset In Statement Of Financial Position Liabilities GrossAmountsOffsetInStatementOfFinancialPositionLiabilities	0	USD
CY2012Q4	ni	Gross Amounts Offset In Statement Of Financial Position Liabilities GrossAmountsOffsetInStatementOfFinancialPositionLiabilities	0	USD
CY2013Q4	ni	Guarantee Obligations Maximum Exposure Thereafter GuaranteeObligationsMaximumExposureThereafter	5120000000	USD
CY2013Q4	ni	Guarantee Obligations Maximum Exposure Year Five GuaranteeObligationsMaximumExposureYearFive	800000000	USD
CY2013Q4	ni	Guarantee Obligations Maximum Exposure Year Four GuaranteeObligationsMaximumExposureYearFour	507000000	USD
CY2013Q4	ni	Guarantee Obligations Maximum Exposure Year One GuaranteeObligationsMaximumExposureYearOne	1265500000	USD
CY2013Q4	ni	Guarantee Obligations Maximum Exposure Year Three GuaranteeObligationsMaximumExposureYearThree	616500000	USD
CY2013Q4	ni	Guarantee Obligations Maximum Exposure Year Two GuaranteeObligationsMaximumExposureYearTwo	280800000	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
CY2013	ni	Impairment And Gain Loss On Sale Of Assets Net ImpairmentAndGainLossOnSaleOfAssetsNet	-17500000	USD
CY2013	ni	Income From Unconsolidated Affiliates IncomeFromUnconsolidatedAffiliates	35700000	USD
CY2012	ni	Income From Unconsolidated Affiliates IncomeFromUnconsolidatedAffiliates	30900000	USD
CY2011	ni	Income From Unconsolidated Affiliates IncomeFromUnconsolidatedAffiliates	13700000	USD
CY2012	ni	Income Tax Rate Change Period IncomeTaxRateChangePeriod	P4Y
CY2013Q4	ni	Income Tax Receivable Recognized From Remeasurement IncomeTaxReceivableRecognizedFromRemeasurement	85700000	USD
CY2013Q2	ni	Income Tax Refunds IncomeTaxRefunds	70600000	USD
CY2013Q1	ni	Income Tax Refunds IncomeTaxRefunds	75100000	USD
CY2013	ni	Increase Decrease In Deferred Charges And Other Non Current Assets IncreaseDecreaseInDeferredChargesAndOtherNonCurrentAssets	20300000	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	107600000	USD
CY2012	ni	Increase Decrease In Exchange Gas Receivable Payable IncreaseDecreaseInExchangeGasReceivablePayable	9200000	USD
CY2013	ni	Increase Decrease In Exchange Gas Receivable Payable IncreaseDecreaseInExchangeGasReceivablePayable	-21000000	USD
CY2013Q4	ni	Net Amounts Of Assets Presented In Statement Of Financial Position NetAmountsOfAssetsPresentedInStatementOfFinancialPosition	23200000	USD
CY2012Q4	ni	Net Amounts Of Assets Presented In Statement Of Financial Position NetAmountsOfAssetsPresentedInStatementOfFinancialPosition	148200000	USD
CY2013Q4	ni	Net Amounts Of Liabilities Presented In Statement Of Financial Position NetAmountsOfLiabilitiesPresentedInStatementOfFinancialPosition	-1700000	USD
CY2012Q4	ni	Net Amounts Of Liabilities Presented In Statement Of Financial Position NetAmountsOfLiabilitiesPresentedInStatementOfFinancialPosition	-115500000	USD
CY2013Q4	ni	Net Derivative Position Assets NetDerivativePositionAssets	21500000	USD
CY2012Q4	ni	Net Derivative Position Assets NetDerivativePositionAssets	75500000	USD
CY2013Q4	ni	Net Derivative Position Liabilities NetDerivativePositionLiabilities	0	USD
CY2012Q4	ni	Net Derivative Position Liabilities NetDerivativePositionLiabilities	-42800000	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
CY2013Q4	ni	Increase In Net Periodic Benefit Cost IncreaseInNetPeriodicBenefitCost	9500000	USD
CY2012Q4	ni	Increase In Net Periodic Benefit Cost IncreaseInNetPeriodicBenefitCost	32900000	USD
CY2013	ni	Incremental Common Shares Attributable To Nonqualified Stock Options IncrementalCommonSharesAttributableToNonqualifiedStockOptions	80000	shares
CY2011	ni	Incremental Common Shares Attributable To Nonqualified Stock Options IncrementalCommonSharesAttributableToNonqualifiedStockOptions	9000	shares
CY2013Q4	ni	Nol Carryforwards Recognized From Remeasurement NolCarryforwardsRecognizedFromRemeasurement	6800000	USD
CY2013	ni	Number Of Customers NumberOfCustomers	3800000
CY2013	ni	Number Of Direct Subsidiaries NumberOfDirectSubsidiaries	13
CY2013	ni	Number Of Notes Tranches Through Private Placement Issuance NumberOfNotesTranchesThroughPrivatePlacementIssuance	2
CY2013	ni	Number Of Reporting Units For Goodwill NumberOfReportingUnitsForGoodwill	3
CY2013	ni	Increase Decrease In Other Accruals IncreaseDecreaseInOtherAccruals	-2200000	USD
CY2012	ni	Increase Decrease In Other Accruals IncreaseDecreaseInOtherAccruals	26200000	USD
CY2011	ni	Increase Decrease In Other Accruals IncreaseDecreaseInOtherAccruals	-33200000	USD
CY2013	ni	Increase Decrease In Prepayments And Other Current Assets IncreaseDecreaseInPrepaymentsAndOtherCurrentAssets	-17000000	USD
CY2012	ni	Incremental Common Shares Attributable To Nonqualified Stock Options IncrementalCommonSharesAttributableToNonqualifiedStockOptions	144000	shares
CY2012Q4	ni	Interest On Affiliated Notes Payable InterestOnAffiliatedNotesPayable	793000000	USD
CY2013Q4	ni	Interest On Affiliated Notes Payable InterestOnAffiliatedNotesPayable	1002400000	USD
CY2012	ni	Interest Paid Net Capitalized Interest InterestPaidNetCapitalizedInterest	386800000	USD
CY2011	ni	Interest Paid Net Capitalized Interest InterestPaidNetCapitalizedInterest	369200000	USD
CY2013	ni	Interest Paid Net Capitalized Interest InterestPaidNetCapitalizedInterest	402700000	USD
CY2003Q3	ni	Interest Rate Swap Agreements Term InterestRateSwapAgreementsTerm	P11Y
CY2013Q4	ni	Legal And Environmental Reserves LegalAndEnvironmentalReserves	32300000	USD
CY2012Q4	ni	Legal And Environmental Reserves LegalAndEnvironmentalReserves	42200000	USD
CY2010Q4	ni	Long Term Receivable LongTermReceivable	31500000	USD
CY2013Q4	ni	Offset For Outstanding Irs Refunds OffsetForOutstandingIrsRefunds	0	USD
CY2012Q4	ni	Offset For Outstanding Irs Refunds OffsetForOutstandingIrsRefunds	16000000	USD
CY2011Q4	ni	Offset For Outstanding Irs Refunds OffsetForOutstandingIrsRefunds	87900000	USD
CY2012Q4	ni	Other Regulatory Assets OtherRegulatoryAssets	840000000	USD
CY2013Q4	ni	Other Regulatory Assets OtherRegulatoryAssets	659200000	USD
CY2005Q3	ni	Payment For Settlement Of Interest Rate Swap PaymentForSettlementOfInterestRateSwap	35500000	USD
CY2012	ni	Payments Pure Air PaymentsPureAir	21600000	USD
CY2013	ni	Payments Pure Air PaymentsPureAir	23600000	USD
CY2011	ni	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	1125200000	USD
CY2013	ni	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	2046000000	USD
CY2012	ni	Payments To Acquire Property Plant And Equipment Including Captial Expenditures From Current Liabilities And Equity Method Investments PaymentsToAcquirePropertyPlantAndEquipmentIncludingCaptialExpendituresFromCurrentLiabilitiesAndEquityMethodInvestments	1585100000	USD
CY2013	ni	Percentage Of Additional Subset Of Assets Capped PercentageOfAdditionalSubsetOfAssetsCapped	0.10
CY2012	ni	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.033
CY2013	ni	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.024
CY2011	ni	Pre Tax Rate For Allowance For Funds Used During Construction PreTaxRateForAllowanceForFundsUsedDuringConstruction	0.036
CY2012Q4	ni	Premiums And Discounts Associated With Long Term Debt PremiumsAndDiscountsAssociatedWithLongTermDebt	12100000	USD
CY2013Q4	ni	Premiums And Discounts Associated With Long Term Debt PremiumsAndDiscountsAssociatedWithLongTermDebt	11400000	USD
CY2013	ni	Primary Business Segments PrimaryBusinessSegments	3
CY2012Q4	ni	Public Utilities Property Plant And Equipment Other Property At Cost Less Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyAtCostLessAccumulatedDepreciation	260000000	USD
CY2013Q4	ni	Public Utilities Property Plant And Equipment Other Property At Cost Less Accumulated Depreciation PublicUtilitiesPropertyPlantAndEquipmentOtherPropertyAtCostLessAccumulatedDepreciation	317900000	USD
CY2013Q4	ni	Public Utilities Property Plant And Equipment Plant In Service Net PublicUtilitiesPropertyPlantAndEquipmentPlantInServiceNet	14047200000	USD
CY2012Q4	ni	Public Utilities Property Plant And Equipment Plant In Service Net PublicUtilitiesPropertyPlantAndEquipmentPlantInServiceNet	12655900000	USD
CY2013Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due PurchaseAndServiceObligationsMinimumFixedPaymentsDue	3015300000	USD
CY2013Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due Current PurchaseAndServiceObligationsMinimumFixedPaymentsDueCurrent	627800000	USD
CY2013Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due In Five Years PurchaseAndServiceObligationsMinimumFixedPaymentsDueInFiveYears	285300000	USD
CY2013Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due In Four Years PurchaseAndServiceObligationsMinimumFixedPaymentsDueInFourYears	385200000	USD
CY2013Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due In Three Years PurchaseAndServiceObligationsMinimumFixedPaymentsDueInThreeYears	420400000	USD
CY2013Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due In Two Years PurchaseAndServiceObligationsMinimumFixedPaymentsDueInTwoYears	505400000	USD
CY2013Q4	ni	Purchase And Service Obligations Minimum Fixed Payments Due Thereafter PurchaseAndServiceObligationsMinimumFixedPaymentsDueThereafter	791200000	USD
CY2013Q4	ni	Purchase Sale Agreements Additional Guarantee Obligations PurchaseSaleAgreementsAdditionalGuaranteeObligations	73500000	USD
CY2011Q2	ni	Real Estate Sales Period RealEstateSalesPeriod	P10Y
CY2013Q4	ni	Regulatory Assets Current And Noncurrent RegulatoryAssetsCurrentAndNoncurrent	1665000000	USD
CY2012Q4	ni	Regulatory Assets Current And Noncurrent RegulatoryAssetsCurrentAndNoncurrent	2187200000	USD
CY2013Q4	ni	Regulatory Assets Requiring Specific Rate Action RegulatoryAssetsRequiringSpecificRateAction	150700000	USD
CY2012Q4	ni	Regulatory Liabilities Current Noncurrent RegulatoryLiabilitiesCurrentNoncurrent	1764900000	USD
CY2013Q4	ni	Regulatory Liabilities Current Noncurrent RegulatoryLiabilitiesCurrentNoncurrent	1730000000	USD
CY2011	ni	Regulatory Treatment Of Afduc Equity RegulatoryTreatmentOfAfducEquity	0.001
CY2012	ni	Regulatory Treatment Of Afduc Equity RegulatoryTreatmentOfAfducEquity	0.005
CY2013	ni	Regulatory Treatment Of Afduc Equity RegulatoryTreatmentOfAfducEquity	0.008
CY2012	ni	Regulatory Treatment Of Afudc Equity RegulatoryTreatmentOfAfudcEquity	3100000	USD
CY2011	ni	Regulatory Treatment Of Afudc Equity RegulatoryTreatmentOfAfudcEquity	600000	USD
CY2013	ni	Regulatory Treatment Of Afudc Equity RegulatoryTreatmentOfAfudcEquity	6500000	USD
CY2013Q4	ni	Remaining Unrecognized Tax Benefits Resulting In Net Operating Loss Carry Forward RemainingUnrecognizedTaxBenefitsResultingInNetOperatingLossCarryForward	298900000	USD
CY2013	dei	Entity Filer Category EntityFilerCategory	Large Accelerated Filer
CY2013Q2	dei	Entity Public Float EntityPublicFloat	8906811019	USD
CY2013	dei	Entity Registrant Name EntityRegistrantName	NISOURCE INC/DE
CY2012	ni	Stock Issued During Period Value Defined Contribution And Profit Sharing Plan StockIssuedDuringPeriodValueDefinedContributionAndProfitSharingPlan	36300000	USD
CY2013	ni	Stock Issued During Period Value Defined Contribution And Profit Sharing Plan StockIssuedDuringPeriodValueDefinedContributionAndProfitSharingPlan	37800000	USD
CY2012	ni	Stock Issued To Employee Savings Plans StockIssuedToEmployeeSavingsPlans	27300000	USD
CY2011	ni	Stock Issued To Employee Savings Plans StockIssuedToEmployeeSavingsPlans	25800000	USD
CY2013	ni	Stock Issued To Employee Savings Plans StockIssuedToEmployeeSavingsPlans	30000000	USD
CY2012Q4	ni	Trade Receivables Available For Transfer TradeReceivablesAvailableForTransfer	525300000	USD
CY2012	ni	Securitization Transaction Fees SecuritizationTransactionFees	3500000	USD
CY2013	ni	Securitization Transaction Fees SecuritizationTransactionFees	2700000	USD
CY2013Q4	ni	Security Interest And Other Subset Of Asset SecurityInterestAndOtherSubsetOfAsset	150000000	USD
CY2013	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
CY2013	ni	Stock Issued During Period Shares Retirement Savings Plan StockIssuedDuringPeriodSharesRetirementSavingsPlan	1281000000	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
CY2011	ni	Stock Issued During Period Value Defined Contribution And Profit Sharing Plan StockIssuedDuringPeriodValueDefinedContributionAndProfitSharingPlan	32000000	USD
CY2013Q4	ni	Trade Receivables Available For Transfer TradeReceivablesAvailableForTransfer	610900000	USD
CY2012Q4	ni	Trade Receivables Not Transferred TradeReceivablesNotTransferred	292000000	USD
CY2013Q4	ni	Trade Receivables Not Transferred TradeReceivablesNotTransferred	345800000	USD
CY2012Q4	ni	Trade Receivables Transferred Net TradeReceivablesTransferredNet	233300000	USD
CY2013Q4	ni	Trade Receivables Transferred Net TradeReceivablesTransferredNet	265100000	USD
CY2013Q4	ni	Transfer Of Capital From One Subsidiary To Other Subsidiary TransferOfCapitalFromOneSubsidiaryToOtherSubsidiary	29000000	USD
CY2012Q4	ni	Transfer Of Capital From One Subsidiary To Other Subsidiary TransferOfCapitalFromOneSubsidiaryToOtherSubsidiary	31400000	USD
CY2013Q4	ni	Unamortized Discount And Premium UnamortizedDiscountAndPremium	53700000	USD
CY2011Q4	ni	Unrecognized Tax Benefit Related To Uncertain Tax Position UnrecognizedTaxBenefitRelatedToUncertainTaxPosition	19900000	USD
CY2012Q4	ni	Unrecognized Tax Benefit Related To Uncertain Tax Position UnrecognizedTaxBenefitRelatedToUncertainTaxPosition	21100000	USD
CY2010Q4	ni	Unrecognized Tax Benefit Related To Uncertain Tax Position UnrecognizedTaxBenefitRelatedToUncertainTaxPosition	17600000	USD
CY2013Q4	ni	Unrecognized Tax Benefit Related To Uncertain Tax Position Net UnrecognizedTaxBenefitRelatedToUncertainTaxPositionNet	700000	USD
CY2013Q4	ni	Unrecognized Tax Benefits Net Of Refunds And Net Operating Loss Carryforwards UnrecognizedTaxBenefitsNetOfRefundsAndNetOperatingLossCarryforwards	800000	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
CY2013Q4	ni	Unrecovered Gas And Fuel Costs UnrecoveredGasAndFuelCosts	9400000	USD
CY2012Q4	ni	Unrecovered Gas And Fuel Costs UnrecoveredGasAndFuelCosts	23200000	USD
CY2011Q4	ni	Valuation Reserve ValuationReserve	22600000	USD
CY2013	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
CY2013	dei	Amendment Flag AmendmentFlag	false
CY2013	dei	Current Fiscal Year End Date CurrentFiscalYearEndDate	--12-31
CY2013	dei	Document Fiscal Period Focus DocumentFiscalPeriodFocus	FY
CY2013	dei	Document Fiscal Year Focus DocumentFiscalYearFocus	2013
CY2013	dei	Document Period End Date DocumentPeriodEndDate	2013-12-31
CY2013	dei	Document Type DocumentType	10-K
CY2013	dei	Entity Central Index Key EntityCentralIndexKey	0001111711
CY2014Q1	dei	Entity Common Stock Shares Outstanding EntityCommonStockSharesOutstanding	313991406	shares
CY2013	dei	Entity Current Reporting Status EntityCurrentReportingStatus	Yes
CY2013	dei	Entity Voluntary Filers EntityVoluntaryFilers	No
CY2013	dei	Entity Well Known Seasoned Issuer EntityWellKnownSeasonedIssuer	Yes
CY2003Q3	invest	Derivative Notional Amount DerivativeNotionalAmount	500000000	USD
CY2005Q3	invest	Derivative Notional Amount DerivativeNotionalAmount	900000000	USD

Files In Submission

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$NI
NISOURCE INC. Stock $ni

2013 Q3 Form 10-K Financial Statement

#000111171114000016 Filed on February 18, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NI NISOURCE INC. Stock $ni

2013 Q3 Form 10-K Financial Statement

#000111171114000016 Filed on February 18, 2014

Income Statement

Balance Sheet

Cashflow Statement

Facts In Submission

Files In Submission

$NI
NISOURCE INC. Stock $ni