$CNP
CENTERPOINT ENERGY INC

2012 Q4 Form 10-K Financial Statement

#000113031013000006 Filed on February 27, 2013

View on sec.gov

Income Statement

Concept 2012 Q4 2012 2011 Q4
Revenue $2.138B $7.452B $2.145B
YoY Change -0.33% -11.81% 2.24%
Cost Of Revenue
YoY Change
Gross Profit
YoY Change
Gross Profit Margin
Selling, General & Admin
YoY Change
% of Gross Profit
Research & Development
YoY Change
% of Gross Profit
Depreciation & Amortization $250.0M $1.050B $209.0M
YoY Change 19.62% 18.51% 2.45%
% of Gross Profit
Operating Expenses $1.828B $6.414B $1.871B
YoY Change -2.3% -10.32% 4.18%
Operating Profit $310.0M $1.038B $274.0M
YoY Change 13.14% -20.03% -9.27%
Interest Expense -$110.0M -$455.0M -$119.0M
YoY Change -7.56% -8.82% -16.78%
% of Operating Profit -35.48% -43.83% -43.43%
Other Income/Expense, Net $10.00M -$281.0M $4.000M
YoY Change 150.0% 126.61% -20.0%
Pretax Income $210.0M $757.0M $159.0M
YoY Change 32.08% -35.52% -3.05%
Income Tax $76.00M $340.0M $42.00M
% Of Pretax Income 36.19% 44.91% 26.42%
Net Earnings $134.0M $417.0M $117.0M
YoY Change 14.53% -69.27% -5.65%
Net Earnings / Revenue 6.27% 5.6% 5.45%
Basic Earnings Per Share $0.31 $0.98 $0.27
Diluted Earnings Per Share $0.31 $0.97 $0.27
COMMON SHARES
Basic Shares Outstanding 427.4M shares 427.2M shares 425.9B shares
Diluted Shares Outstanding 429.8M shares

Balance Sheet

Concept 2012 Q4 2012 2011 Q4
SHORT-TERM ASSETS
Cash & Short-Term Investments $1.186B $1.186B $606.0M
YoY Change 95.71% 95.71% 7.07%
Cash & Equivalents $646.0M $646.0M $220.0M
Short-Term Investments $540.0M $540.0M $386.0M
Other Short-Term Assets $216.0M $591.0M $192.0M
YoY Change 12.5% -2.31% -29.93%
Inventory $322.0M $322.0M $353.0M
Prepaid Expenses
Receivables $768.0M $768.0M $773.0M
Other Receivables $7.000M $7.000M $0.00
Total Short-Term Assets $2.874B $2.874B $2.337B
YoY Change 22.98% 22.98% -9.49%
LONG-TERM ASSETS
Property, Plant & Equipment $13.60B $13.60B $12.40B
YoY Change 9.64% 9.64% 5.71%
Goodwill $1.468B $1.696B
YoY Change -13.44% 0.0%
Intangibles
YoY Change
Long-Term Investments $405.0M $405.0M $472.0M
YoY Change -14.19% -14.19% 0.85%
Other Assets $197.0M $4.527B $157.0M
YoY Change 25.48% -5.61% -8.72%
Total Long-Term Assets $6.400B $20.00B $6.964B
YoY Change -8.1% 3.26% 20.13%
TOTAL ASSETS
Total Short-Term Assets $2.874B $2.874B $2.337B
Total Long-Term Assets $6.400B $20.00B $6.964B
Total Assets $22.87B $22.87B $21.70B
YoY Change 5.38% 5.38% 7.92%
SHORT-TERM LIABILITIES
YoY Change
Accounts Payable $561.0M $561.0M $560.0M
YoY Change 0.18% 0.18% -16.04%
Accrued Expenses $150.0M $150.0M $164.0M
YoY Change -8.54% -8.54% -4.09%
Deferred Revenue
YoY Change
Short-Term Debt $38.00M $38.00M $62.00M
YoY Change -38.71% -38.71% 16.98%
Long-Term Debt Due $1.400B $1.400B $484.0M
YoY Change 189.26% 189.26% 13.08%
Total Short-Term Liabilities $3.575B $3.575B $2.593B
YoY Change 37.87% 37.87% -1.03%
LONG-TERM LIABILITIES
Long-Term Debt $8.357B $8.357B $8.641B
YoY Change -3.29% -3.29% -4.0%
Other Long-Term Liabilities $247.0M $2.485B $305.0M
YoY Change -19.02% 2.9% -31.77%
Total Long-Term Liabilities $6.638B $10.84B $6.247B
YoY Change 6.26% -1.94% 18.05%
TOTAL LIABILITIES
Total Short-Term Liabilities $3.575B $3.575B $2.593B
Total Long-Term Liabilities $6.638B $10.84B $6.247B
Total Liabilities $10.21B $18.57B $8.840B
YoY Change 15.53% 6.23% 11.73%
SHAREHOLDERS EQUITY
Retained Earnings $302.0M $231.0M
YoY Change 30.74% -129.28%
Common Stock $4.000M $4.000M
YoY Change 0.0% 0.0%
Preferred Stock
YoY Change
Treasury Stock (at cost)
YoY Change
Treasury Stock Shares 166.0 shares 166.0 shares
Shareholders Equity $4.301B $4.301B $4.222B
YoY Change
Total Liabilities & Shareholders Equity $22.87B $22.87B $21.70B
YoY Change 5.38% 5.38% 7.92%

Cashflow Statement

Concept 2012 Q4 2012 2011 Q4
OPERATING ACTIVITIES
Net Income $134.0M $417.0M $117.0M
YoY Change 14.53% -69.27% -5.65%
Depreciation, Depletion And Amortization $250.0M $1.050B $209.0M
YoY Change 19.62% 18.51% 2.45%
Cash From Operating Activities $481.0M $1.860B $439.0M
YoY Change 9.57% -1.48% 8.93%
INVESTING ACTIVITIES
Capital Expenditures -$394.0M -$1.212B -$343.0M
YoY Change 14.87% -6.98% -24.78%
Acquisitions $360.0M
YoY Change
Other Investing Activities $0.00 $13.00M -$15.00M
YoY Change -100.0% -750.0% -130.0%
Cash From Investing Activities -$394.0M -$1.603B -$358.0M
YoY Change 10.06% 32.92% -11.82%
FINANCING ACTIVITIES
Cash Dividend Paid
YoY Change
Common Stock Issuance & Retirement, Net $4.000M
YoY Change -33.33%
Debt Paid & Issued, Net $1.590B
YoY Change 74.92%
Cash From Financing Activities -163.0M $169.0M 36.00M
YoY Change -552.78% -125.57% -65.05%
NET CHANGE
Cash From Operating Activities 481.0M $1.860B 439.0M
Cash From Investing Activities -394.0M -$1.603B -358.0M
Cash From Financing Activities -163.0M $169.0M 36.00M
Net Change In Cash -76.00M $426.0M 117.0M
YoY Change -164.96% 1928.57% 17.0%
FREE CASH FLOW
Cash From Operating Activities $481.0M $1.860B $439.0M
Capital Expenditures -$394.0M -$1.212B -$343.0M
Free Cash Flow $875.0M $3.072B $782.0M
YoY Change 11.89% -3.73% -8.96%

Facts In Submission

Frame Concept Type Concept / XBRL Key Value Unit
CY2012Q4 us-gaap Accounts Payable Current
AccountsPayableCurrent
561000000 USD
CY2011Q4 us-gaap Accounts Payable Current
AccountsPayableCurrent
560000000 USD
CY2011Q4 us-gaap Accounts Receivable Net Current
AccountsReceivableNetCurrent
773000000 USD
CY2012Q4 us-gaap Accounts Receivable Net Current
AccountsReceivableNetCurrent
768000000 USD
CY2012Q4 us-gaap Accrual For Environmental Loss Contingencies
AccrualForEnvironmentalLossContingencies
14000000 USD
CY2012Q4 us-gaap Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
4780000000 USD
CY2011Q4 us-gaap Accumulated Depreciation Depletion And Amortization Property Plant And Equipment
AccumulatedDepreciationDepletionAndAmortizationPropertyPlantAndEquipment
4466000000 USD
CY2012Q4 us-gaap Additional Collateral Aggregate Fair Value
AdditionalCollateralAggregateFairValue
5000000 USD
CY2011Q4 us-gaap Additional Collateral Aggregate Fair Value
AdditionalCollateralAggregateFairValue
38000000 USD
CY2010 us-gaap Additions To Noncurrent Assets
AdditionsToNoncurrentAssets
1462000000 USD
CY2012 us-gaap Additions To Noncurrent Assets
AdditionsToNoncurrentAssets
1188000000 USD
CY2011 us-gaap Additions To Noncurrent Assets
AdditionsToNoncurrentAssets
1191000000 USD
CY2011Q4 us-gaap Allowance For Doubtful Accounts Receivable
AllowanceForDoubtfulAccountsReceivable
25000000 USD
CY2012Q4 us-gaap Allowance For Doubtful Accounts Receivable
AllowanceForDoubtfulAccountsReceivable
25000000 USD
CY2012 us-gaap Amortization Of Financing Costs
AmortizationOfFinancingCosts
32000000 USD
CY2011 us-gaap Amortization Of Financing Costs
AmortizationOfFinancingCosts
30000000 USD
CY2010 us-gaap Amortization Of Financing Costs
AmortizationOfFinancingCosts
27000000 USD
CY2012 us-gaap Amortization Of Regulatory Asset
AmortizationOfRegulatoryAsset
488000000 USD
CY2011 us-gaap Amortization Of Regulatory Asset
AmortizationOfRegulatoryAsset
357000000 USD
CY2010 us-gaap Amortization Of Regulatory Asset
AmortizationOfRegulatoryAsset
333000000 USD
CY2010 us-gaap Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount
AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount
1458598 shares
CY2011Q4 us-gaap Asset Retirement Obligation
AssetRetirementObligation
156000000 USD
CY2012Q4 us-gaap Asset Retirement Obligation
AssetRetirementObligation
164000000 USD
CY2010Q4 us-gaap Asset Retirement Obligation
AssetRetirementObligation
84000000 USD
CY2012 us-gaap Asset Retirement Obligation Accretion Expense
AssetRetirementObligationAccretionExpense
7000000 USD
CY2011 us-gaap Asset Retirement Obligation Accretion Expense
AssetRetirementObligationAccretionExpense
5000000 USD
CY2011 us-gaap Asset Retirement Obligation Period Increase Decrease
AssetRetirementObligationPeriodIncreaseDecrease
67000000 USD
CY2012 us-gaap Asset Retirement Obligation Revision Of Estimate
AssetRetirementObligationRevisionOfEstimate
1000000 USD
CY2011 us-gaap Asset Retirement Obligation Revision Of Estimate
AssetRetirementObligationRevisionOfEstimate
67000000 USD
CY2011Q4 us-gaap Assets
Assets
21703000000 USD
CY2012Q4 us-gaap Assets
Assets
22871000000 USD
CY2010Q4 us-gaap Assets
Assets
20111000000 USD
CY2012Q4 us-gaap Assets Current
AssetsCurrent
2874000000 USD
CY2011Q4 us-gaap Assets Current
AssetsCurrent
2337000000 USD
CY2011Q4 us-gaap Assets Fair Value Disclosure Recurring
AssetsFairValueDisclosureRecurring
550000000 USD
CY2012Q4 us-gaap Assets Fair Value Disclosure Recurring
AssetsFairValueDisclosureRecurring
660000000 USD
CY2012Q4 us-gaap Assets Noncurrent
AssetsNoncurrent
6400000000 USD
CY2011Q4 us-gaap Assets Noncurrent
AssetsNoncurrent
6964000000 USD
CY2012Q3 us-gaap Business Acquisition Cost Of Acquired Entity Cash Paid
BusinessAcquisitionCostOfAcquiredEntityCashPaid
273000000 USD
CY2012Q3 us-gaap Business Acquisition Purchase Price Allocation Goodwill Amount
BusinessAcquisitionPurchasePriceAllocationGoodwillAmount
16000000 USD
CY2012Q3 us-gaap Business Acquisition Purchase Price Allocation Property Plant And Equipment
BusinessAcquisitionPurchasePriceAllocationPropertyPlantAndEquipment
253000000 USD
CY2010 us-gaap Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain
BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
0 USD
CY2011 us-gaap Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain
BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
0 USD
CY2012 us-gaap Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain
BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
136000000 USD
CY2012Q3 us-gaap Business Combination Step Acquisition Equity Interest In Acquiree Remeasurement Gain
BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain
136000000 USD
CY2011 us-gaap Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
110000000 USD
CY2010 us-gaap Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
137000000 USD
CY2012 us-gaap Capital Expenditures Incurred But Not Yet Paid
CapitalExpendituresIncurredButNotYetPaid
110000000 USD
CY2011Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
220000000 USD
CY2012Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
646000000 USD
CY2010Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
199000000 USD
CY2009Q4 us-gaap Cash And Cash Equivalents At Carrying Value
CashAndCashEquivalentsAtCarryingValue
740000000 USD
CY2010 us-gaap Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
-541000000 USD
CY2011 us-gaap Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
21000000 USD
CY2012 us-gaap Cash And Cash Equivalents Period Increase Decrease
CashAndCashEquivalentsPeriodIncreaseDecrease
426000000 USD
CY2011Q4 us-gaap Collateral Already Posted Aggregate Fair Value
CollateralAlreadyPostedAggregateFairValue
1000000 USD
CY2012Q4 us-gaap Collateral Already Posted Aggregate Fair Value
CollateralAlreadyPostedAggregateFairValue
1000000 USD
CY2012Q4 us-gaap Commitments And Contingencies
CommitmentsAndContingencies
USD
CY2011Q4 us-gaap Commitments And Contingencies
CommitmentsAndContingencies
USD
CY2012 us-gaap Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
0.81
CY2011 us-gaap Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
0.79
CY2010 us-gaap Common Stock Dividends Per Share Declared
CommonStockDividendsPerShareDeclared
0.78
CY2012Q4 us-gaap Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
0.01
CY2010Q4 us-gaap Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
0.01
CY2011Q4 us-gaap Common Stock Par Or Stated Value Per Share
CommonStockParOrStatedValuePerShare
0.01
CY2012Q4 us-gaap Common Stock Shares Authorized
CommonStockSharesAuthorized
1000000000 shares
CY2010Q4 us-gaap Common Stock Shares Authorized
CommonStockSharesAuthorized
1000000000 shares
CY2011Q4 us-gaap Common Stock Shares Authorized
CommonStockSharesAuthorized
1000000000 shares
CY2010 us-gaap Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
449000000 USD
CY2011 us-gaap Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
1341000000 USD
CY2012 us-gaap Comprehensive Income Net Of Tax
ComprehensiveIncomeNetOfTax
415000000 USD
CY2010 us-gaap Cost Of Purchased Oil And Gas
CostOfPurchasedOilAndGas
4574000000 USD
CY2012 us-gaap Cost Of Purchased Oil And Gas
CostOfPurchasedOilAndGas
2873000000 USD
CY2011 us-gaap Cost Of Purchased Oil And Gas
CostOfPurchasedOilAndGas
4055000000 USD
CY2011 us-gaap Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
-63000000 USD
CY2012 us-gaap Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
0 USD
CY2010 us-gaap Current Federal Tax Expense Benefit
CurrentFederalTaxExpenseBenefit
40000000 USD
CY2011 us-gaap Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
-39000000 USD
CY2010 us-gaap Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
64000000 USD
CY2012 us-gaap Current Income Tax Expense Benefit
CurrentIncomeTaxExpenseBenefit
12000000 USD
CY2011 us-gaap Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
24000000 USD
CY2012 us-gaap Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
12000000 USD
CY2010 us-gaap Current State And Local Tax Expense Benefit
CurrentStateAndLocalTaxExpenseBenefit
24000000 USD
CY2011 us-gaap Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
432000000 USD
CY2012 us-gaap Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
280000000 USD
CY2010 us-gaap Deferred Federal Income Tax Expense Benefit
DeferredFederalIncomeTaxExpenseBenefit
220000000 USD
CY2011 us-gaap Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
443000000 USD
CY2012 us-gaap Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
328000000 USD
CY2010 us-gaap Deferred Income Tax Expense Benefit
DeferredIncomeTaxExpenseBenefit
199000000 USD
CY2011 us-gaap Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
11000000 USD
CY2012 us-gaap Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
48000000 USD
CY2010 us-gaap Deferred State And Local Income Tax Expense Benefit
DeferredStateAndLocalIncomeTaxExpenseBenefit
-21000000 USD
CY2012Q4 us-gaap Deferred Tax Assets Gross Current
DeferredTaxAssetsGrossCurrent
11000000 USD
CY2011Q4 us-gaap Deferred Tax Assets Gross Current
DeferredTaxAssetsGrossCurrent
17000000 USD
CY2012Q4 us-gaap Deferred Tax Assets Gross Noncurrent
DeferredTaxAssetsGrossNoncurrent
537000000 USD
CY2011Q4 us-gaap Deferred Tax Assets Gross Noncurrent
DeferredTaxAssetsGrossNoncurrent
645000000 USD
CY2011Q4 us-gaap Deferred Tax Assets Liabilities Net
DeferredTaxAssetsLiabilitiesNet
-4339000000 USD
CY2012Q4 us-gaap Deferred Tax Assets Liabilities Net
DeferredTaxAssetsLiabilitiesNet
-4757000000 USD
CY2012Q4 us-gaap Deferred Tax Assets Net
DeferredTaxAssetsNet
546000000 USD
CY2011Q4 us-gaap Deferred Tax Assets Net
DeferredTaxAssetsNet
658000000 USD
CY2012Q4 us-gaap Deferred Tax Assets Net Noncurrent
DeferredTaxAssetsNetNoncurrent
535000000 USD
CY2011Q4 us-gaap Deferred Tax Assets Net Noncurrent
DeferredTaxAssetsNetNoncurrent
641000000 USD
CY2010Q4 us-gaap Deferred Tax Assets Regulatory Assets And Liabilities
DeferredTaxAssetsRegulatoryAssetsAndLiabilities
11000000 USD
CY2011Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits
DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
363000000 USD
CY2012Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Compensation And Benefits Employee Benefits
DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsEmployeeBenefits
383000000 USD
CY2012Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts
DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
10000000 USD
CY2011Q4 us-gaap Deferred Tax Assets Tax Deferred Expense Reserves And Accruals Allowance For Doubtful Accounts
DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAllowanceForDoubtfulAccounts
10000000 USD
CY2011Q4 us-gaap Deferred Tax Liabilities
DeferredTaxLiabilities
4997000000 USD
CY2012Q4 us-gaap Deferred Tax Liabilities
DeferredTaxLiabilities
5303000000 USD
CY2012Q4 us-gaap Deferred Tax Liabilities Current
DeferredTaxLiabilitiesCurrent
604000000 USD
CY2011Q4 us-gaap Deferred Tax Liabilities Current
DeferredTaxLiabilitiesCurrent
507000000 USD
CY2012Q4 us-gaap Deferred Tax Liabilities Gross Current
DeferredTaxLiabilitiesGrossCurrent
615000000 USD
CY2011Q4 us-gaap Deferred Tax Liabilities Gross Current
DeferredTaxLiabilitiesGrossCurrent
524000000 USD
CY2011Q4 us-gaap Deferred Tax Liabilities Gross Noncurrent
DeferredTaxLiabilitiesGrossNoncurrent
4473000000 USD
CY2012Q4 us-gaap Deferred Tax Liabilities Gross Noncurrent
DeferredTaxLiabilitiesGrossNoncurrent
4688000000 USD
CY2011Q4 us-gaap Deferred Tax Liabilities Noncurrent
DeferredTaxLiabilitiesNoncurrent
3832000000 USD
CY2012Q4 us-gaap Deferred Tax Liabilities Noncurrent
DeferredTaxLiabilitiesNoncurrent
4153000000 USD
CY2011Q4 us-gaap Deferred Tax Liabilities Regulatory Assets And Liabilities
DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
1499000000 USD
CY2012Q4 us-gaap Deferred Tax Liabilities Regulatory Assets And Liabilities
DeferredTaxLiabilitiesRegulatoryAssetsAndLiabilities
1278000000 USD
CY2011Q4 us-gaap Defined Benefit Plan Accumulated Benefit Obligation
DefinedBenefitPlanAccumulatedBenefitObligation
2064000000 USD
CY2012Q4 us-gaap Defined Benefit Plan Accumulated Benefit Obligation
DefinedBenefitPlanAccumulatedBenefitObligation
2283000000 USD
CY2012 us-gaap Defined Benefit Plan Effect Of One Percentage Point Decrease On Accumulated Postretirement Benefit Obligation1
DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnAccumulatedPostretirementBenefitObligation1
15000000 USD
CY2012 us-gaap Defined Benefit Plan Effect Of One Percentage Point Decrease On Service And Interest Cost Components1
DefinedBenefitPlanEffectOfOnePercentagePointDecreaseOnServiceAndInterestCostComponents1
1000000 USD
CY2012 us-gaap Defined Benefit Plan Effect Of One Percentage Point Increase On Accumulated Postretirement Benefit Obligation
DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnAccumulatedPostretirementBenefitObligation
17000000 USD
CY2012 us-gaap Defined Benefit Plan Effect Of One Percentage Point Increase On Service And Interest Cost Components
DefinedBenefitPlanEffectOfOnePercentagePointIncreaseOnServiceAndInterestCostComponents
1000000 USD
CY2012Q4 us-gaap Defined Benefit Plan Fair Value Of Plan Assets
DefinedBenefitPlanFairValueOfPlanAssets
1698000000 USD
CY2011Q4 us-gaap Defined Benefit Plan Fair Value Of Plan Assets
DefinedBenefitPlanFairValueOfPlanAssets
1506000000 USD
CY2012 us-gaap Depreciation
Depreciation
562000000 USD
CY2010 us-gaap Depreciation
Depreciation
531000000 USD
CY2011 us-gaap Depreciation
Depreciation
529000000 USD
CY2010 us-gaap Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
864000000 USD
CY2011 us-gaap Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
886000000 USD
CY2012 us-gaap Depreciation Depletion And Amortization
DepreciationDepletionAndAmortization
1050000000 USD
CY2011Q4 us-gaap Derivative Assets
DerivativeAssets
107000000 USD
CY2012Q4 us-gaap Derivative Assets
DerivativeAssets
42000000 USD
CY2011Q4 us-gaap Derivative Assets Current
DerivativeAssetsCurrent
87000000 USD
CY2012Q4 us-gaap Derivative Assets Current
DerivativeAssetsCurrent
36000000 USD
CY2011Q4 us-gaap Derivative Assets Noncurrent
DerivativeAssetsNoncurrent
20000000 USD
CY2012Q4 us-gaap Derivative Assets Noncurrent
DerivativeAssetsNoncurrent
6000000 USD
CY2011Q4 us-gaap Derivative Fair Value Amount Offset Against Collateral Net
DerivativeFairValueAmountOffsetAgainstCollateralNet
55000000 USD
CY2012Q4 us-gaap Derivative Fair Value Amount Offset Against Collateral Net
DerivativeFairValueAmountOffsetAgainstCollateralNet
26000000 USD
CY2011Q4 us-gaap Derivative Financial Instruments Liabilities Fair Value Disclosure
DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure
52000000 USD
CY2012Q4 us-gaap Derivative Financial Instruments Liabilities Fair Value Disclosure
DerivativeFinancialInstrumentsLiabilitiesFairValueDisclosure
16000000 USD
CY2012 us-gaap Derivative Instruments Gain Loss Recognized In Income Net
DerivativeInstrumentsGainLossRecognizedInIncomeNet
8000000 USD
CY2010 us-gaap Derivative Instruments Gain Loss Recognized In Income Net
DerivativeInstrumentsGainLossRecognizedInIncomeNet
-6000000 USD
CY2011 us-gaap Derivative Instruments Gain Loss Recognized In Income Net
DerivativeInstrumentsGainLossRecognizedInIncomeNet
-1000000 USD
CY2011 us-gaap Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net
DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
-7000000 USD
CY2012 us-gaap Derivative Instruments Not Designated As Hedging Instruments Gain Loss Net
DerivativeInstrumentsNotDesignatedAsHedgingInstrumentsGainLossNet
-91000000 USD
CY2012Q4 us-gaap Derivative Liabilities Current
DerivativeLiabilitiesCurrent
14000000 USD
CY2011Q4 us-gaap Derivative Liabilities Current
DerivativeLiabilitiesCurrent
46000000 USD
CY2012Q4 us-gaap Derivative Liabilities Noncurrent
DerivativeLiabilitiesNoncurrent
2000000 USD
CY2011Q4 us-gaap Derivative Liabilities Noncurrent
DerivativeLiabilitiesNoncurrent
6000000 USD
CY2012Q4 us-gaap Derivative Net Liability Position Aggregate Fair Value
DerivativeNetLiabilityPositionAggregateFairValue
5000000 USD
CY2011Q4 us-gaap Derivative Net Liability Position Aggregate Fair Value
DerivativeNetLiabilityPositionAggregateFairValue
39000000 USD
CY2012 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
0.98
CY2010 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
1.08
CY2011 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
3.19
CY2011Q2 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
0.28
CY2011Q3 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
2.28
CY2011Q4 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
0.27
CY2011Q1 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
0.35
CY2012Q3 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
0.02
CY2012Q2 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
0.29
CY2012Q4 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
0.31
CY2012Q1 us-gaap Earnings Per Share Basic
EarningsPerShareBasic
0.34
CY2010 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
1.07
CY2011 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
3.17
CY2012 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
0.97
CY2011Q4 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
0.27
CY2011Q2 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
0.28
CY2011Q1 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
0.35
CY2011Q3 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
2.27
CY2012Q2 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
0.29
CY2012Q1 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
0.34
CY2012Q4 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
0.31
CY2012Q3 us-gaap Earnings Per Share Diluted
EarningsPerShareDiluted
0.02
CY2012 us-gaap Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
0.449
CY2010 us-gaap Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
0.373
CY2011 us-gaap Effective Income Tax Rate Continuing Operations
EffectiveIncomeTaxRateContinuingOperations
0.344
CY2012 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.350
CY2010 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.350
CY2011 us-gaap Effective Income Tax Rate Reconciliation At Federal Statutory Income Tax Rate
EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
0.350
CY2010 us-gaap Electric Utility Revenue
ElectricUtilityRevenue
2205000000 USD
CY2012 us-gaap Electric Utility Revenue
ElectricUtilityRevenue
2540000000 USD
CY2011 us-gaap Electric Utility Revenue
ElectricUtilityRevenue
2337000000 USD
CY2012 us-gaap Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
3000000 USD
CY2010 us-gaap Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
9000000 USD
CY2011 us-gaap Employee Service Share Based Compensation Cash Received From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationCashReceivedFromExerciseOfStockOptions
5000000 USD
CY2012Q4 us-gaap Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized
EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized
19000000 USD
CY2012 us-gaap Employee Service Share Based Compensation Nonvested Awards Total Compensation Cost Not Yet Recognized Period For Recognition1
EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedPeriodForRecognition1
P1Y8M
CY2010 us-gaap Employee Service Share Based Compensation Tax Benefit From Compensation Expense
EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
6000000 USD
CY2011 us-gaap Employee Service Share Based Compensation Tax Benefit From Compensation Expense
EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
7000000 USD
CY2012 us-gaap Employee Service Share Based Compensation Tax Benefit From Compensation Expense
EmployeeServiceShareBasedCompensationTaxBenefitFromCompensationExpense
7000000 USD
CY2012 us-gaap Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
14000000 USD
CY2010 us-gaap Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
5000000 USD
CY2011 us-gaap Employee Service Share Based Compensation Tax Benefit Realized From Exercise Of Stock Options
EmployeeServiceShareBasedCompensationTaxBenefitRealizedFromExerciseOfStockOptions
8000000 USD
CY2012Q4 us-gaap Energy Related Inventory Gas Stored Underground
EnergyRelatedInventoryGasStoredUnderground
145000000 USD
CY2011Q4 us-gaap Energy Related Inventory Gas Stored Underground
EnergyRelatedInventoryGasStoredUnderground
187000000 USD
CY2012 us-gaap Environmental Costs Recognized Recovery Credited To Expense
EnvironmentalCostsRecognizedRecoveryCreditedToExpense
285000 USD
CY2012 us-gaap Extraordinary Item Gain Or Loss Net Of Tax Attributable To Reporting Entity
ExtraordinaryItemGainOrLossNetOfTaxAttributableToReportingEntity
0 USD
CY2011 us-gaap Extraordinary Item Gain Or Loss Net Of Tax Attributable To Reporting Entity
ExtraordinaryItemGainOrLossNetOfTaxAttributableToReportingEntity
587000000 USD
CY2010 us-gaap Extraordinary Item Gain Or Loss Net Of Tax Attributable To Reporting Entity
ExtraordinaryItemGainOrLossNetOfTaxAttributableToReportingEntity
0 USD
CY2011Q3 us-gaap Extraordinary Item Gain Or Loss Net Of Tax Attributable To Reporting Entity
ExtraordinaryItemGainOrLossNetOfTaxAttributableToReportingEntity
587000000 USD
CY2005Q4 us-gaap Extraordinary Item Gain Or Loss Net Of Tax Attributable To Reporting Entity
ExtraordinaryItemGainOrLossNetOfTaxAttributableToReportingEntity
-947000000 USD
CY2011Q4 us-gaap Extraordinary Item Gain Or Loss Net Of Tax Attributable To Reporting Entity
ExtraordinaryItemGainOrLossNetOfTaxAttributableToReportingEntity
0 USD
CY2011Q2 us-gaap Extraordinary Item Gain Or Loss Net Of Tax Attributable To Reporting Entity
ExtraordinaryItemGainOrLossNetOfTaxAttributableToReportingEntity
0 USD
CY2011Q1 us-gaap Extraordinary Item Gain Or Loss Net Of Tax Attributable To Reporting Entity
ExtraordinaryItemGainOrLossNetOfTaxAttributableToReportingEntity
0 USD
CY2011Q3 us-gaap Extraordinary Items Gross
ExtraordinaryItemsGross
921000000 USD
CY2011Q4 us-gaap Goodwill
Goodwill
1696000000 USD
CY2012Q4 us-gaap Goodwill
Goodwill
1468000000 USD
CY2012Q3 us-gaap Goodwill Acquired During Period
GoodwillAcquiredDuringPeriod
24000000 USD
CY2012 us-gaap Goodwill Acquired During Period
GoodwillAcquiredDuringPeriod
24000000 USD
CY2010 us-gaap Goodwill Impairment Loss
GoodwillImpairmentLoss
0 USD
CY2012 us-gaap Goodwill Impairment Loss
GoodwillImpairmentLoss
252000000 USD
CY2011 us-gaap Goodwill Impairment Loss
GoodwillImpairmentLoss
0 USD
CY2012Q3 us-gaap Goodwill Impairment Loss
GoodwillImpairmentLoss
252000000 USD
CY2012Q4 us-gaap Guarantee Obligations Maximum Exposure
GuaranteeObligationsMaximumExposure
73000000 USD
CY2010 us-gaap Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle
IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple
442000000 USD
CY2011 us-gaap Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle
IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple
770000000 USD
CY2012 us-gaap Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle
IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple
417000000 USD
CY2011Q3 us-gaap Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle
IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple
386000000 USD
CY2011Q4 us-gaap Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle
IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple
117000000 USD
CY2011Q1 us-gaap Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle
IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple
148000000 USD
CY2011Q2 us-gaap Income Loss Before Extraordinary Items And Cumulative Effect Of Change In Accounting Principle
IncomeLossBeforeExtraordinaryItemsAndCumulativeEffectOfChangeInAccountingPrinciple
119000000 USD
CY2011 us-gaap Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
1174000000 USD
CY2010 us-gaap Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
705000000 USD
CY2012 us-gaap Income Loss From Continuing Operations Before Income Taxes Extraordinary Items Noncontrolling Interest
IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
757000000 USD
CY2012 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
757000000 USD
CY2010 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
705000000 USD
CY2011 us-gaap Income Loss From Continuing Operations Before Income Taxes Minority Interest And Income Loss From Equity Method Investments
IncomeLossFromContinuingOperationsBeforeIncomeTaxesMinorityInterestAndIncomeLossFromEquityMethodInvestments
1174000000 USD
CY2010 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
1.08
CY2012 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
0.98
CY2011 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
1.81
CY2011Q4 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
0.27
CY2011Q1 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
0.35
CY2011Q3 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
0.90
CY2011Q2 us-gaap Income Loss From Continuing Operations Per Basic Share
IncomeLossFromContinuingOperationsPerBasicShare
0.28
CY2011 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
1.80
CY2012 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
0.97
CY2010 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
1.07
CY2011Q2 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
0.28
CY2011Q3 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
0.90
CY2011Q1 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
0.35
CY2011Q4 us-gaap Income Loss From Continuing Operations Per Diluted Share
IncomeLossFromContinuingOperationsPerDilutedShare
0.27
CY2010 us-gaap Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
29000000 USD
CY2011 us-gaap Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
30000000 USD
CY2012 us-gaap Income Loss From Equity Method Investments
IncomeLossFromEquityMethodInvestments
31000000 USD
CY2010 us-gaap Income Loss From Equity Method Investments Net Of Dividends Or Distributions
IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
-13000000 USD
CY2011 us-gaap Income Loss From Equity Method Investments Net Of Dividends Or Distributions
IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
-8000000 USD
CY2012 us-gaap Income Loss From Equity Method Investments Net Of Dividends Or Distributions
IncomeLossFromEquityMethodInvestmentsNetOfDividendsOrDistributions
-8000000 USD
CY2010 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Basic Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
0.00
CY2012 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Basic Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
0.00
CY2011 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Basic Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
1.38
CY2011Q2 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Basic Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
0.00
CY2011Q3 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Basic Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
1.38
CY2011Q4 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Basic Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
0.00
CY2011Q1 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Basic Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerBasicShare
0.00
CY2010 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Diluted Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare
0.00
CY2012 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Diluted Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare
0.00
CY2011 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Diluted Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare
1.37
CY2011Q2 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Diluted Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare
0.00
CY2011Q1 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Diluted Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare
0.00
CY2011Q4 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Diluted Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare
0.00
CY2011Q3 us-gaap Income Loss From Extraordinary Items Net Of Tax Per Diluted Share
IncomeLossFromExtraordinaryItemsNetOfTaxPerDilutedShare
1.37
CY2012Q4 us-gaap Income Tax Examination Increase Decrease In Liability From Prior Year
IncomeTaxExaminationIncreaseDecreaseInLiabilityFromPriorYear
32000000 USD
CY2010 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
263000000 USD
CY2011 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
404000000 USD
CY2012 us-gaap Income Tax Expense Benefit
IncomeTaxExpenseBenefit
340000000 USD
CY2012 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
265000000 USD
CY2011 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
411000000 USD
CY2010 us-gaap Income Tax Reconciliation Income Tax Expense Benefit At Federal Statutory Income Tax Rate
IncomeTaxReconciliationIncomeTaxExpenseBenefitAtFederalStatutoryIncomeTaxRate
247000000 USD
CY2010 us-gaap Income Tax Reconciliation Nondeductible Expense Impairment Losses
IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
0 USD
CY2011 us-gaap Income Tax Reconciliation Nondeductible Expense Impairment Losses
IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
0 USD
CY2012 us-gaap Income Tax Reconciliation Nondeductible Expense Impairment Losses
IncomeTaxReconciliationNondeductibleExpenseImpairmentLosses
88000000 USD
CY2010 us-gaap Income Tax Reconciliation Other Reconciling Items
IncomeTaxReconciliationOtherReconcilingItems
-13000000 USD
CY2011 us-gaap Income Tax Reconciliation Other Reconciling Items
IncomeTaxReconciliationOtherReconcilingItems
-18000000 USD
CY2012 us-gaap Income Tax Reconciliation Other Reconciling Items
IncomeTaxReconciliationOtherReconcilingItems
-17000000 USD
CY2012 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
39000000 USD
CY2010 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
2000000 USD
CY2011 us-gaap Income Tax Reconciliation State And Local Income Taxes
IncomeTaxReconciliationStateAndLocalIncomeTaxes
22000000 USD
CY2012 us-gaap Income Tax Reconciliation Tax Credits Investment
IncomeTaxReconciliationTaxCreditsInvestment
2000000 USD
CY2011 us-gaap Income Tax Reconciliation Tax Credits Investment
IncomeTaxReconciliationTaxCreditsInvestment
6000000 USD
CY2010 us-gaap Income Tax Reconciliation Tax Credits Investment
IncomeTaxReconciliationTaxCreditsInvestment
7000000 USD
CY2010 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
207000000 USD
CY2012 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
46000000 USD
CY2011 us-gaap Income Taxes Paid Net
IncomeTaxesPaidNet
-205000000 USD
CY2011Q4 us-gaap Income Taxes Receivable
IncomeTaxesReceivable
0 USD
CY2012Q4 us-gaap Income Taxes Receivable
IncomeTaxesReceivable
7000000 USD
CY2011 us-gaap Increase Decrease In Accounts And Other Receivables
IncreaseDecreaseInAccountsAndOtherReceivables
-40000000 USD
CY2010 us-gaap Increase Decrease In Accounts And Other Receivables
IncreaseDecreaseInAccountsAndOtherReceivables
-101000000 USD
CY2012 us-gaap Increase Decrease In Accounts And Other Receivables
IncreaseDecreaseInAccountsAndOtherReceivables
-10000000 USD
CY2012 us-gaap Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
-6000000 USD
CY2011 us-gaap Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
-81000000 USD
CY2010 us-gaap Increase Decrease In Accounts Payable
IncreaseDecreaseInAccountsPayable
-34000000 USD
CY2010 us-gaap Increase Decrease In Commodity Contract Assets And Liabilities
IncreaseDecreaseInCommodityContractAssetsAndLiabilities
5000000 USD
CY2012 us-gaap Increase Decrease In Commodity Contract Assets And Liabilities
IncreaseDecreaseInCommodityContractAssetsAndLiabilities
-20000000 USD
CY2011 us-gaap Increase Decrease In Commodity Contract Assets And Liabilities
IncreaseDecreaseInCommodityContractAssetsAndLiabilities
13000000 USD
CY2010 us-gaap Increase Decrease In Income Taxes Receivable
IncreaseDecreaseInIncomeTaxesReceivable
138000000 USD
CY2011 us-gaap Increase Decrease In Income Taxes Receivable
IncreaseDecreaseInIncomeTaxesReceivable
-138000000 USD
CY2012 us-gaap Increase Decrease In Income Taxes Receivable
IncreaseDecreaseInIncomeTaxesReceivable
7000000 USD
CY2010 us-gaap Increase Decrease In Inventories
IncreaseDecreaseInInventories
54000000 USD
CY2011 us-gaap Increase Decrease In Inventories
IncreaseDecreaseInInventories
-11000000 USD
CY2012 us-gaap Increase Decrease In Inventories
IncreaseDecreaseInInventories
-27000000 USD
CY2011 us-gaap Increase Decrease In Margin Deposits Outstanding
IncreaseDecreaseInMarginDepositsOutstanding
-34000000 USD
CY2012 us-gaap Increase Decrease In Margin Deposits Outstanding
IncreaseDecreaseInMarginDepositsOutstanding
-53000000 USD
CY2010 us-gaap Increase Decrease In Margin Deposits Outstanding
IncreaseDecreaseInMarginDepositsOutstanding
-7000000 USD
CY2012 us-gaap Increase Decrease In Other Current Assets
IncreaseDecreaseInOtherCurrentAssets
12000000 USD
CY2011 us-gaap Increase Decrease In Other Current Assets
IncreaseDecreaseInOtherCurrentAssets
-12000000 USD
CY2010 us-gaap Increase Decrease In Other Current Assets
IncreaseDecreaseInOtherCurrentAssets
2000000 USD
CY2010 us-gaap Increase Decrease In Other Current Liabilities
IncreaseDecreaseInOtherCurrentLiabilities
-1000000 USD
CY2011 us-gaap Increase Decrease In Other Current Liabilities
IncreaseDecreaseInOtherCurrentLiabilities
18000000 USD
CY2012 us-gaap Increase Decrease In Other Current Liabilities
IncreaseDecreaseInOtherCurrentLiabilities
18000000 USD
CY2012 us-gaap Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
18000000 USD
CY2011 us-gaap Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
9000000 USD
CY2010 us-gaap Increase Decrease In Other Operating Assets
IncreaseDecreaseInOtherOperatingAssets
8000000 USD
CY2012 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
-17000000 USD
CY2010 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
2000000 USD
CY2011 us-gaap Increase Decrease In Other Operating Capital Net
IncreaseDecreaseInOtherOperatingCapitalNet
-24000000 USD
CY2010 us-gaap Increase Decrease In Other Operating Liabilities
IncreaseDecreaseInOtherOperatingLiabilities
12000000 USD
CY2012 us-gaap Increase Decrease In Other Operating Liabilities
IncreaseDecreaseInOtherOperatingLiabilities
16000000 USD
CY2011 us-gaap Increase Decrease In Other Operating Liabilities
IncreaseDecreaseInOtherOperatingLiabilities
42000000 USD
CY2010 us-gaap Increase Decrease In Over Under Energy Recovery
IncreaseDecreaseInOverUnderEnergyRecovery
9000000 USD
CY2012 us-gaap Increase Decrease In Over Under Energy Recovery
IncreaseDecreaseInOverUnderEnergyRecovery
52000000 USD
CY2011 us-gaap Increase Decrease In Over Under Energy Recovery
IncreaseDecreaseInOverUnderEnergyRecovery
70000000 USD
CY2012 us-gaap Increase Decrease In Regulatory Assets And Liabilities
IncreaseDecreaseInRegulatoryAssetsAndLiabilities
-66000000 USD
CY2011 us-gaap Increase Decrease In Regulatory Assets And Liabilities
IncreaseDecreaseInRegulatoryAssetsAndLiabilities
-31000000 USD
CY2010 us-gaap Increase Decrease In Regulatory Assets And Liabilities
IncreaseDecreaseInRegulatoryAssetsAndLiabilities
-14000000 USD
CY2012 us-gaap Increase Decrease In Restricted Cash
IncreaseDecreaseInRestrictedCash
13000000 USD
CY2011 us-gaap Increase Decrease In Restricted Cash
IncreaseDecreaseInRestrictedCash
3000000 USD
CY2010 us-gaap Increase Decrease In Restricted Cash
IncreaseDecreaseInRestrictedCash
5000000 USD
CY2011 us-gaap Incremental Common Shares Attributable To Contingently Issuable Shares
IncrementalCommonSharesAttributableToContingentlyIssuableShares
2741000 shares
CY2012 us-gaap Incremental Common Shares Attributable To Contingently Issuable Shares
IncrementalCommonSharesAttributableToContingentlyIssuableShares
2453000 shares
CY2010 us-gaap Incremental Common Shares Attributable To Contingently Issuable Shares
IncrementalCommonSharesAttributableToContingentlyIssuableShares
2585000 shares
CY2010 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
470000 shares
CY2011 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
347000 shares
CY2012 us-gaap Incremental Common Shares Attributable To Share Based Payment Arrangements
IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
152000 shares
CY2010 us-gaap Interest And Debt Expense
InterestAndDebtExpense
481000000 USD
CY2012 us-gaap Interest And Debt Expense
InterestAndDebtExpense
422000000 USD
CY2011 us-gaap Interest And Debt Expense
InterestAndDebtExpense
456000000 USD
CY2011 us-gaap Interest Paid Net
InterestPaidNet
565000000 USD
CY2010 us-gaap Interest Paid Net
InterestPaidNet
609000000 USD
CY2012 us-gaap Interest Paid Net
InterestPaidNet
556000000 USD
CY2011Q4 us-gaap Interest Payable Current
InterestPayableCurrent
164000000 USD
CY2012Q4 us-gaap Interest Payable Current
InterestPayableCurrent
150000000 USD
CY2011Q4 us-gaap Inventory Adjustments
InventoryAdjustments
11000000 USD
CY2012Q4 us-gaap Inventory Adjustments
InventoryAdjustments
4000000 USD
CY2011Q4 us-gaap Inventory Net
InventoryNet
353000000 USD
CY2012Q4 us-gaap Inventory Net
InventoryNet
322000000 USD
CY2012Q4 us-gaap Inventory Raw Materials And Supplies Net Of Reserves
InventoryRawMaterialsAndSuppliesNetOfReserves
177000000 USD
CY2011Q4 us-gaap Inventory Raw Materials And Supplies Net Of Reserves
InventoryRawMaterialsAndSuppliesNetOfReserves
166000000 USD
CY2012 us-gaap Inventory Write Down
InventoryWriteDown
4000000 USD
CY2011 us-gaap Inventory Write Down
InventoryWriteDown
11000000 USD
CY2010 us-gaap Inventory Write Down
InventoryWriteDown
6000000 USD
CY2011Q4 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
56000000 USD
CY2012Q4 us-gaap Investments Fair Value Disclosure
InvestmentsFairValueDisclosure
76000000 USD
CY2012Q4 us-gaap Investments In Affiliates Subsidiaries Associates And Joint Ventures
InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
405000000 USD
CY2011Q4 us-gaap Investments In Affiliates Subsidiaries Associates And Joint Ventures
InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures
472000000 USD
CY2010 us-gaap Lease And Rental Expense
LeaseAndRentalExpense
77000000 USD
CY2012 us-gaap Lease And Rental Expense
LeaseAndRentalExpense
27000000 USD
CY2011 us-gaap Lease And Rental Expense
LeaseAndRentalExpense
43000000 USD
CY2012Q4 us-gaap Letters Of Credit Outstanding Amount
LettersOfCreditOutstandingAmount
11000000 USD
CY2011Q4 us-gaap Letters Of Credit Outstanding Amount
LettersOfCreditOutstandingAmount
20000000 USD
CY2012Q4 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
22871000000 USD
CY2011Q4 us-gaap Liabilities And Stockholders Equity
LiabilitiesAndStockholdersEquity
21703000000 USD
CY2011Q4 us-gaap Liabilities Current
LiabilitiesCurrent
2593000000 USD
CY2012Q4 us-gaap Liabilities Current
LiabilitiesCurrent
3575000000 USD
CY2011Q4 us-gaap Liabilities Fair Value Disclosure Recurring
LiabilitiesFairValueDisclosureRecurring
249000000 USD
CY2012Q4 us-gaap Liabilities Fair Value Disclosure Recurring
LiabilitiesFairValueDisclosureRecurring
284000000 USD
CY2012Q4 us-gaap Liabilities Noncurrent
LiabilitiesNoncurrent
6638000000 USD
CY2011Q4 us-gaap Liabilities Noncurrent
LiabilitiesNoncurrent
6247000000 USD
CY2012Q4 us-gaap Line Of Credit Facility Amount Outstanding
LineOfCreditFacilityAmountOutstanding
0 USD
CY2011Q4 us-gaap Line Of Credit Facility Amount Outstanding
LineOfCreditFacilityAmountOutstanding
0 USD
CY2011Q4 us-gaap Line Of Credit Facility Maximum Borrowing Capacity
LineOfCreditFacilityMaximumBorrowingCapacity
2450000000 USD
CY2012Q4 us-gaap Line Of Credit Facility Maximum Borrowing Capacity
LineOfCreditFacilityMaximumBorrowingCapacity
2450000000 USD
CY2011Q4 us-gaap Long Term Debt Current
LongTermDebtCurrent
484000000 USD
CY2012Q4 us-gaap Long Term Debt Current
LongTermDebtCurrent
1400000000 USD
CY2012Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Next Twelve Months
LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
1300000000 USD
CY2012Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Year Five
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive
1000000000 USD
CY2012Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Year Four
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour
716000000 USD
CY2012Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Year Three
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree
791000000 USD
CY2012Q4 us-gaap Long Term Debt Maturities Repayments Of Principal In Year Two
LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo
514000000 USD
CY2012Q4 us-gaap Long Term Debt Noncurrent
LongTermDebtNoncurrent
8357000000 USD
CY2011Q4 us-gaap Long Term Debt Noncurrent
LongTermDebtNoncurrent
8641000000 USD
CY2011Q4 us-gaap Longterm Commercial Paper Current And Noncurrent
LongtermCommercialPaperCurrentAndNoncurrent
285000000 USD
CY2012Q4 us-gaap Longterm Commercial Paper Current And Noncurrent
LongtermCommercialPaperCurrentAndNoncurrent
0 USD
CY2012 us-gaap Loss Contingency Damages Sought
LossContingencyDamagesSought
in excess of $1 billion
CY2011Q4 us-gaap Marketable Securities Current
MarketableSecuritiesCurrent
386000000 USD
CY2012Q4 us-gaap Marketable Securities Current
MarketableSecuritiesCurrent
540000000 USD
CY2010Q4 us-gaap Marketable Securities Current
MarketableSecuritiesCurrent
367000000 USD
CY2009Q4 us-gaap Marketable Securities Current
MarketableSecuritiesCurrent
300000000 USD
CY2012 us-gaap Marketable Securities Gain Loss
MarketableSecuritiesGainLoss
154000000 USD
CY2010 us-gaap Marketable Securities Gain Loss
MarketableSecuritiesGainLoss
67000000 USD
CY2011 us-gaap Marketable Securities Gain Loss
MarketableSecuritiesGainLoss
19000000 USD
CY2011 us-gaap Marketable Securities Unrealized Gain Loss
MarketableSecuritiesUnrealizedGainLoss
19000000 USD
CY2010 us-gaap Marketable Securities Unrealized Gain Loss
MarketableSecuritiesUnrealizedGainLoss
67000000 USD
CY2012 us-gaap Marketable Securities Unrealized Gain Loss
MarketableSecuritiesUnrealizedGainLoss
154000000 USD
CY2011 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
-661000000 USD
CY2010 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
-507000000 USD
CY2012 us-gaap Net Cash Provided By Used In Financing Activities
NetCashProvidedByUsedInFinancingActivities
169000000 USD
CY2010 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
-1420000000 USD
CY2011 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
-1206000000 USD
CY2012 us-gaap Net Cash Provided By Used In Investing Activities
NetCashProvidedByUsedInInvestingActivities
-1603000000 USD
CY2010 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
1386000000 USD
CY2011 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
1888000000 USD
CY2012 us-gaap Net Cash Provided By Used In Operating Activities
NetCashProvidedByUsedInOperatingActivities
1860000000 USD
CY2011 us-gaap Net Income Loss
NetIncomeLoss
1357000000 USD
CY2010 us-gaap Net Income Loss
NetIncomeLoss
442000000 USD
CY2012 us-gaap Net Income Loss
NetIncomeLoss
417000000 USD
CY2011Q1 us-gaap Net Income Loss
NetIncomeLoss
148000000 USD
CY2011Q2 us-gaap Net Income Loss
NetIncomeLoss
119000000 USD
CY2011Q4 us-gaap Net Income Loss
NetIncomeLoss
117000000 USD
CY2011Q3 us-gaap Net Income Loss
NetIncomeLoss
973000000 USD
CY2012Q4 us-gaap Net Income Loss
NetIncomeLoss
134000000 USD
CY2012Q1 us-gaap Net Income Loss
NetIncomeLoss
147000000 USD
CY2012Q3 us-gaap Net Income Loss
NetIncomeLoss
10000000 USD
CY2012Q2 us-gaap Net Income Loss
NetIncomeLoss
126000000 USD
CY2011Q4 us-gaap Net Regulatory Assets
NetRegulatoryAssets
3580000000 USD
CY2012Q4 us-gaap Net Regulatory Assets
NetRegulatoryAssets
3231000000 USD
CY2012 us-gaap Nonoperating Income Expense
NonoperatingIncomeExpense
-281000000 USD
CY2010 us-gaap Nonoperating Income Expense
NonoperatingIncomeExpense
-544000000 USD
CY2011 us-gaap Nonoperating Income Expense
NonoperatingIncomeExpense
-124000000 USD
CY2010 us-gaap Operating Expenses
OperatingExpenses
7536000000 USD
CY2012 us-gaap Operating Expenses
OperatingExpenses
6414000000 USD
CY2011 us-gaap Operating Expenses
OperatingExpenses
7152000000 USD
CY2011 us-gaap Operating Income Loss
OperatingIncomeLoss
1298000000 USD
CY2010 us-gaap Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax
1000000 USD
CY2011 us-gaap Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax
0 USD
CY2012 us-gaap Operating Income Loss
OperatingIncomeLoss
1038000000 USD
CY2010 us-gaap Operating Income Loss
OperatingIncomeLoss
1249000000 USD
CY2011Q3 us-gaap Operating Income Loss
OperatingIncomeLoss
357000000 USD
CY2011Q2 us-gaap Operating Income Loss
OperatingIncomeLoss
303000000 USD
CY2011Q4 us-gaap Operating Income Loss
OperatingIncomeLoss
274000000 USD
CY2011Q1 us-gaap Operating Income Loss
OperatingIncomeLoss
364000000 USD
CY2012Q1 us-gaap Operating Income Loss
OperatingIncomeLoss
338000000 USD
CY2012Q2 us-gaap Operating Income Loss
OperatingIncomeLoss
302000000 USD
CY2012Q3 us-gaap Operating Income Loss
OperatingIncomeLoss
88000000 USD
CY2012Q4 us-gaap Operating Income Loss
OperatingIncomeLoss
310000000 USD
CY2012Q4 us-gaap Operating Leases Future Minimum Payments Due
OperatingLeasesFutureMinimumPaymentsDue
48000000 USD
CY2012Q4 us-gaap Operating Leases Future Minimum Payments Due Current
OperatingLeasesFutureMinimumPaymentsDueCurrent
12000000 USD
CY2012Q4 us-gaap Operating Leases Future Minimum Payments Due In Five Years
OperatingLeasesFutureMinimumPaymentsDueInFiveYears
3000000 USD
CY2012Q4 us-gaap Operating Leases Future Minimum Payments Due In Four Years
OperatingLeasesFutureMinimumPaymentsDueInFourYears
5000000 USD
CY2012Q4 us-gaap Operating Leases Future Minimum Payments Due In Three Years
OperatingLeasesFutureMinimumPaymentsDueInThreeYears
6000000 USD
CY2012Q4 us-gaap Operating Leases Future Minimum Payments Due In Two Years
OperatingLeasesFutureMinimumPaymentsDueInTwoYears
9000000 USD
CY2012Q4 us-gaap Operating Leases Future Minimum Payments Due Thereafter
OperatingLeasesFutureMinimumPaymentsDueThereafter
13000000 USD
CY2011Q4 us-gaap Other Assets Current
OtherAssetsCurrent
192000000 USD
CY2012Q4 us-gaap Other Assets Current
OtherAssetsCurrent
216000000 USD
CY2011Q4 us-gaap Other Assets Noncurrent
OtherAssetsNoncurrent
157000000 USD
CY2012Q4 us-gaap Other Assets Noncurrent
OtherAssetsNoncurrent
197000000 USD
CY2012 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
-2000000 USD
CY2010 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
7000000 USD
CY2011 us-gaap Other Comprehensive Income Loss Net Of Tax Portion Attributable To Parent
OtherComprehensiveIncomeLossNetOfTaxPortionAttributableToParent
-16000000 USD
CY2012 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
2000000 USD
CY2010 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
-6000000 USD
CY2011 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Adjustment Net Of Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansAdjustmentNetOfTax
16000000 USD
CY2012 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
2000000 USD
CY2011 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
7000000 USD
CY2010 us-gaap Other Comprehensive Income Loss Pension And Other Postretirement Benefit Plans Tax
OtherComprehensiveIncomeLossPensionAndOtherPostretirementBenefitPlansTax
5000000 USD
CY2012 us-gaap Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Net Of Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeNetOfTax
0 USD
CY2012 us-gaap Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax
0 USD
CY2010 us-gaap Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax
0 USD
CY2011 us-gaap Other Comprehensive Income Loss Reclassification Adjustment On Derivatives Included In Net Income Tax
OtherComprehensiveIncomeLossReclassificationAdjustmentOnDerivativesIncludedInNetIncomeTax
0 USD
CY2012Q4 us-gaap Other Liabilities Current
OtherLiabilitiesCurrent
380000000 USD
CY2011Q4 us-gaap Other Liabilities Current
OtherLiabilitiesCurrent
366000000 USD
CY2011Q4 us-gaap Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
305000000 USD
CY2012Q4 us-gaap Other Liabilities Noncurrent
OtherLiabilitiesNoncurrent
247000000 USD
CY2011Q4 us-gaap Other Long Term Debt Current
OtherLongTermDebtCurrent
46000000 USD
CY2012Q4 us-gaap Other Long Term Debt Current
OtherLongTermDebtCurrent
815000000 USD
CY2012Q4 us-gaap Other Long Term Debt Noncurrent
OtherLongTermDebtNoncurrent
4957000000 USD
CY2011Q4 us-gaap Other Long Term Debt Noncurrent
OtherLongTermDebtNoncurrent
6426000000 USD
CY2011 us-gaap Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
23000000 USD
CY2010 us-gaap Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
12000000 USD
CY2012 us-gaap Other Nonoperating Income Expense
OtherNonoperatingIncomeExpense
38000000 USD
CY2010 us-gaap Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
-22000000 USD
CY2012 us-gaap Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
13000000 USD
CY2011 us-gaap Payments For Proceeds From Other Investing Activities
PaymentsForProceedsFromOtherInvestingActivities
-2000000 USD
CY2012 us-gaap Payments Of Debt Extinguishment Costs
PaymentsOfDebtExtinguishmentCosts
69000000 USD
CY2010 us-gaap Payments Of Debt Extinguishment Costs
PaymentsOfDebtExtinguishmentCosts
0 USD
CY2011 us-gaap Payments Of Debt Extinguishment Costs
PaymentsOfDebtExtinguishmentCosts
58000000 USD
CY2012 us-gaap Payments Of Debt Issuance Costs
PaymentsOfDebtIssuanceCosts
16000000 USD
CY2010 us-gaap Payments Of Debt Issuance Costs
PaymentsOfDebtIssuanceCosts
2000000 USD
CY2011 us-gaap Payments Of Debt Issuance Costs
PaymentsOfDebtIssuanceCosts
24000000 USD
CY2010 us-gaap Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
319000000 USD
CY2012 us-gaap Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
346000000 USD
CY2011 us-gaap Payments Of Dividends Common Stock
PaymentsOfDividendsCommonStock
337000000 USD
CY2011 us-gaap Payments To Acquire Assets Investing Activities
PaymentsToAcquireAssetsInvestingActivities
0 USD
CY2010 us-gaap Payments To Acquire Assets Investing Activities
PaymentsToAcquireAssetsInvestingActivities
0 USD
CY2012 us-gaap Payments To Acquire Assets Investing Activities
PaymentsToAcquireAssetsInvestingActivities
360000000 USD
CY2012 us-gaap Payments To Acquire Interest In Joint Venture
PaymentsToAcquireInterestInJointVenture
5000000 USD
CY2010 us-gaap Payments To Acquire Interest In Joint Venture
PaymentsToAcquireInterestInJointVenture
18000000 USD
CY2011 us-gaap Payments To Acquire Interest In Joint Venture
PaymentsToAcquireInterestInJointVenture
12000000 USD
CY2012 us-gaap Payments To Acquire Productive Assets
PaymentsToAcquireProductiveAssets
1212000000 USD
CY2011 us-gaap Payments To Acquire Productive Assets
PaymentsToAcquireProductiveAssets
1303000000 USD
CY2010 us-gaap Payments To Acquire Productive Assets
PaymentsToAcquireProductiveAssets
1509000000 USD
CY2011Q4 us-gaap Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent
PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
1065000000 USD
CY2012Q4 us-gaap Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent
PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrent
1143000000 USD
CY2011 us-gaap Pension Contributions
PensionContributions
75000000 USD
CY2012 us-gaap Pension Contributions
PensionContributions
82000000 USD
CY2010 us-gaap Pension Contributions
PensionContributions
8000000 USD
CY2012Q4 us-gaap Postemployment Benefits Liability Current And Noncurrent
PostemploymentBenefitsLiabilityCurrentAndNoncurrent
32000000 USD
CY2011Q4 us-gaap Postemployment Benefits Liability Current And Noncurrent
PostemploymentBenefitsLiabilityCurrentAndNoncurrent
30000000 USD
CY2012Q4 us-gaap Preferred Stock Par Or Stated Value Per Share
PreferredStockParOrStatedValuePerShare
0.01
CY2010Q4 us-gaap Preferred Stock Par Or Stated Value Per Share
PreferredStockParOrStatedValuePerShare
0.01
CY2011Q4 us-gaap Preferred Stock Par Or Stated Value Per Share
PreferredStockParOrStatedValuePerShare
0.01
CY2012Q4 us-gaap Preferred Stock Shares Authorized
PreferredStockSharesAuthorized
20000000 shares
CY2011Q4 us-gaap Preferred Stock Shares Authorized
PreferredStockSharesAuthorized
20000000 shares
CY2010Q4 us-gaap Preferred Stock Shares Authorized
PreferredStockSharesAuthorized
20000000 shares
CY2011Q4 us-gaap Preferred Stock Shares Outstanding
PreferredStockSharesOutstanding
0 shares
CY2012Q4 us-gaap Preferred Stock Shares Outstanding
PreferredStockSharesOutstanding
0 shares
CY2010Q4 us-gaap Preferred Stock Shares Outstanding
PreferredStockSharesOutstanding
0 shares
CY2011 us-gaap Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
6000000 USD
CY2012 us-gaap Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
4000000 USD
CY2010 us-gaap Proceeds From Issuance Of Common Stock
ProceedsFromIssuanceOfCommonStock
416000000 USD
CY2010 us-gaap Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
0 USD
CY2011 us-gaap Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
550000000 USD
CY2012 us-gaap Proceeds From Issuance Of Long Term Debt
ProceedsFromIssuanceOfLongTermDebt
2495000000 USD
CY2012 us-gaap Proceeds From Repayments Of Commercial Paper
ProceedsFromRepaymentsOfCommercialPaper
-285000000 USD
CY2011 us-gaap Proceeds From Repayments Of Commercial Paper
ProceedsFromRepaymentsOfCommercialPaper
102000000 USD
CY2010 us-gaap Proceeds From Repayments Of Commercial Paper
ProceedsFromRepaymentsOfCommercialPaper
183000000 USD
CY2010 us-gaap Proceeds From Repayments Of Short Term Debt
ProceedsFromRepaymentsOfShortTermDebt
-2000000 USD
CY2011 us-gaap Proceeds From Repayments Of Short Term Debt
ProceedsFromRepaymentsOfShortTermDebt
9000000 USD
CY2012 us-gaap Proceeds From Repayments Of Short Term Debt
ProceedsFromRepaymentsOfShortTermDebt
-24000000 USD
CY2012Q4 us-gaap Property Plant And Equipment Gross
PropertyPlantAndEquipmentGross
18377000000 USD
CY2011Q4 us-gaap Property Plant And Equipment Gross
PropertyPlantAndEquipmentGross
16868000000 USD
CY2012Q4 us-gaap Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
13597000000 USD
CY2011Q4 us-gaap Property Plant And Equipment Net
PropertyPlantAndEquipmentNet
12402000000 USD
CY2012 us-gaap Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
16000000 USD
CY2011 us-gaap Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
26000000 USD
CY2010 us-gaap Provision For Doubtful Accounts
ProvisionForDoubtfulAccounts
30000000 USD
CY2012Q4 us-gaap Recorded Third Party Environmental Recoveries Amount
RecordedThirdPartyEnvironmentalRecoveriesAmount
5800000 USD
CY2011Q4 us-gaap Regulatory Assets
RegulatoryAssets
4619000000 USD
CY2012Q4 us-gaap Regulatory Assets
RegulatoryAssets
4324000000 USD
CY2011Q4 us-gaap Regulatory Assets Noncurrent
RegulatoryAssetsNoncurrent
4619000000 USD
CY2012Q4 us-gaap Regulatory Assets Noncurrent
RegulatoryAssetsNoncurrent
4324000000 USD
CY2012Q4 us-gaap Regulatory Liabilities
RegulatoryLiabilities
1093000000 USD
CY2011Q4 us-gaap Regulatory Liabilities
RegulatoryLiabilities
1039000000 USD
CY2012Q4 us-gaap Regulatory Liability Noncurrent
RegulatoryLiabilityNoncurrent
1093000000 USD
CY2011Q4 us-gaap Regulatory Liability Noncurrent
RegulatoryLiabilityNoncurrent
1039000000 USD
CY2012Q4 us-gaap Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided
RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided
14000000 USD
CY2011Q4 us-gaap Remaining Amounts Of Regulatory Assets For Which No Return On Investment During Recovery Period Is Provided
RemainingAmountsOfRegulatoryAssetsForWhichNoReturnOnInvestmentDuringRecoveryPeriodIsProvided
16000000 USD
CY2011 us-gaap Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
909000000 USD
CY2010 us-gaap Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
783000000 USD
CY2012 us-gaap Repayments Of Long Term Debt
RepaymentsOfLongTermDebt
1590000000 USD
CY2012Q4 us-gaap Restricted Cash And Cash Equivalents
RestrictedCashAndCashEquivalents
54000000 USD
CY2011Q4 us-gaap Restricted Cash And Cash Equivalents
RestrictedCashAndCashEquivalents
42000000 USD
CY2010 us-gaap Revenues
Revenues
8785000000 USD
CY2012 us-gaap Revenues
Revenues
7452000000 USD
CY2011 us-gaap Revenues
Revenues
8450000000 USD
CY2011Q3 us-gaap Revenues
Revenues
1881000000 USD
CY2011Q1 us-gaap Revenues
Revenues
2587000000 USD
CY2011Q2 us-gaap Revenues
Revenues
1837000000 USD
CY2011Q4 us-gaap Revenues
Revenues
2145000000 USD
CY2012Q1 us-gaap Revenues
Revenues
2084000000 USD
CY2012Q2 us-gaap Revenues
Revenues
1525000000 USD
CY2012Q3 us-gaap Revenues
Revenues
1705000000 USD
CY2012Q4 us-gaap Revenues
Revenues
2138000000 USD
CY2012 us-gaap Revenues From Transactions With Other Operating Segments Of Same Entity
RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity
0 USD
CY2010 us-gaap Revenues From Transactions With Other Operating Segments Of Same Entity
RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity
0 USD
CY2011 us-gaap Revenues From Transactions With Other Operating Segments Of Same Entity
RevenuesFromTransactionsWithOtherOperatingSegmentsOfSameEntity
0 USD
CY2012 us-gaap Share Based Compensation Arrangement By Share Based Payment Award Award Vesting Period1
ShareBasedCompensationArrangementByShareBasedPaymentAwardAwardVestingPeriod1
P3Y
CY2012Q4 us-gaap Share Based Compensation Arrangement By Share Based Payment Award Number Of Shares Authorized
ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAuthorized
14000000 shares
CY2012Q4 us-gaap Short Term Borrowings
ShortTermBorrowings
38000000 USD
CY2011Q4 us-gaap Short Term Borrowings
ShortTermBorrowings
62000000 USD
CY2012Q4 us-gaap Stockholders Equity
StockholdersEquity
4301000000 USD
CY2011Q4 us-gaap Stockholders Equity
StockholdersEquity
4222000000 USD
CY2010Q4 us-gaap Stockholders Equity
StockholdersEquity
3198000000 USD
CY2012 us-gaap Tax Adjustments Settlements And Unusual Provisions
TaxAdjustmentsSettlementsAndUnusualProvisions
28000000 USD
CY2011Q3 us-gaap Tax Effect Of Extraordinary Item
TaxEffectOfExtraordinaryItem
334000000 USD
CY2011 us-gaap Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
376000000 USD
CY2012 us-gaap Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
365000000 USD
CY2010 us-gaap Taxes Excluding Income And Excise Taxes
TaxesExcludingIncomeAndExciseTaxes
379000000 USD
CY2011Q4 us-gaap Taxes Payable Current
TaxesPayableCurrent
207000000 USD
CY2012Q4 us-gaap Taxes Payable Current
TaxesPayableCurrent
160000000 USD
CY2011Q4 us-gaap Unbilled Receivables Current
UnbilledReceivablesCurrent
326000000 USD
CY2012Q4 us-gaap Unbilled Receivables Current
UnbilledReceivablesCurrent
339000000 USD
CY2010 us-gaap Unrealized Gain Loss On Commodity Contracts
UnrealizedGainLossOnCommodityContracts
4000000 USD
CY2011 us-gaap Unrealized Gain Loss On Commodity Contracts
UnrealizedGainLossOnCommodityContracts
8000000 USD
CY2012 us-gaap Unrealized Gain Loss On Commodity Contracts
UnrealizedGainLossOnCommodityContracts
-16000000 USD
CY2010Q4 us-gaap Unrecognized Tax Benefits
UnrecognizedTaxBenefits
252000000 USD
CY2012Q4 us-gaap Unrecognized Tax Benefits
UnrecognizedTaxBenefits
-23000000 USD
CY2011Q4 us-gaap Unrecognized Tax Benefits
UnrecognizedTaxBenefits
51000000 USD
CY2009Q4 us-gaap Unrecognized Tax Benefits
UnrecognizedTaxBenefits
187000000 USD
CY2010 us-gaap Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
4000000 USD
CY2012 us-gaap Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
75000000 USD
CY2011 us-gaap Unrecognized Tax Benefits Decreases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsDecreasesResultingFromPriorPeriodTaxPositions
203000000 USD
CY2011 us-gaap Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
5000000 USD
CY2012 us-gaap Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
0 USD
CY2010 us-gaap Unrecognized Tax Benefits Increases Resulting From Current Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromCurrentPeriodTaxPositions
60000000 USD
CY2012 us-gaap Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
0 USD
CY2011 us-gaap Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
-1000000 USD
CY2010 us-gaap Unrecognized Tax Benefits Increases Resulting From Prior Period Tax Positions
UnrecognizedTaxBenefitsIncreasesResultingFromPriorPeriodTaxPositions
9000000 USD
CY2012Q4 us-gaap Unrecognized Tax Benefits Interest On Income Taxes Accrued
UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
8000000 USD
CY2011Q4 us-gaap Unrecognized Tax Benefits Interest On Income Taxes Accrued
UnrecognizedTaxBenefitsInterestOnIncomeTaxesAccrued
1000000 USD
CY2010 us-gaap Unrecognized Tax Benefits Interest On Income Taxes Expense
UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
8000000 USD
CY2011 us-gaap Unrecognized Tax Benefits Interest On Income Taxes Expense
UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
-13000000 USD
CY2012 us-gaap Unrecognized Tax Benefits Interest On Income Taxes Expense
UnrecognizedTaxBenefitsInterestOnIncomeTaxesExpense
-7000000 USD
CY2011 us-gaap Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations
UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
1000000 USD
CY2012 us-gaap Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations
UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
0 USD
CY2010 us-gaap Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations
UnrecognizedTaxBenefitsReductionsResultingFromLapseOfApplicableStatuteOfLimitations
0 USD
CY2010Q4 us-gaap Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
17000000 USD
CY2011Q4 us-gaap Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
21000000 USD
CY2012Q4 us-gaap Unrecognized Tax Benefits That Would Impact Effective Tax Rate
UnrecognizedTaxBenefitsThatWouldImpactEffectiveTaxRate
-3000000 USD
CY2012 us-gaap Use Of Estimates
UseOfEstimates
<div style="font-family:Times New Roman;font-size:10pt;"><div style="line-height:120%;text-align:left;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;font-style:italic;font-weight:bold;">Use of Estimates</font></div><div style="line-height:120%;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;"><br clear="none"/></font></div><div style="line-height:120%;text-align:justify;text-indent:24px;font-size:10pt;"><font style="font-family:inherit;font-size:10pt;">The preparation of financial statements in conformity with generally accepted accounting principles requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, 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>
CY2012Q4 us-gaap Valuation Allowance Amount
ValuationAllowanceAmount
2000000 USD
CY2011Q4 us-gaap Valuation Allowance Amount
ValuationAllowanceAmount
4000000 USD
CY2011 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
428724000 shares
CY2010 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
412776000 shares
CY2012 us-gaap Weighted Average Number Of Diluted Shares Outstanding
WeightedAverageNumberOfDilutedSharesOutstanding
429794000 shares
CY2011 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
425636000 shares
CY2010 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
409721000 shares
CY2012 us-gaap Weighted Average Number Of Shares Outstanding Basic
WeightedAverageNumberOfSharesOutstandingBasic
427189000 shares
CY2010 cnp Accretion Of Debt Component Indexed Debt Securities
AccretionOfDebtComponentIndexedDebtSecurities
22000000 USD
CY2012 cnp Accretion Of Debt Component Indexed Debt Securities
AccretionOfDebtComponentIndexedDebtSecurities
24000000 USD
CY2004Q4 cnp Amount Awarded In Final True Up Order
AmountAwardedInFinalTrueUpOrder
2300000000 USD
CY2011 cnp Accretion Of Debt Component Indexed Debt Securities
AccretionOfDebtComponentIndexedDebtSecurities
22000000 USD
CY2011Q3 cnp Additional Amount Allowed By District Court On True Up Appeal
AdditionalAmountAllowedByDistrictCourtOnTrueUpAppeal
1695000000 USD
CY2010 cnp Amount Of Allowed Equity Return Recognized In Period
AmountOfAllowedEquityReturnRecognizedInPeriod
16000000 USD
CY2011 cnp Amount Of Allowed Equity Return Recognized In Period
AmountOfAllowedEquityReturnRecognizedInPeriod
21000000 USD
CY2012 cnp Amount Of Allowed Equity Return Recognized In Period
AmountOfAllowedEquityReturnRecognizedInPeriod
47000000 USD
CY2011 cnp Amount Of Decrease In Income Tax Expense Recorded Related To Effects Of Re Measuring Accumulated Deferred Income Taxes
AmountOfDecreaseInIncomeTaxExpenseRecordedRelatedToEffectsOfReMeasuringAccumulatedDeferredIncomeTaxes
17000000 USD
CY2010 cnp Amount Of Decrease In Income Tax Expense Recorded Related To Effects Of Re Measuring Accumulated Deferred Income Taxes
AmountOfDecreaseInIncomeTaxExpenseRecordedRelatedToEffectsOfReMeasuringAccumulatedDeferredIncomeTaxes
24000000 USD
CY2012Q4 cnp Amount Of Indemnification Receivable
AmountOfIndemnificationReceivable
26000000 USD
CY2010 cnp Amount Of Net Reduction To Income Tax Expense From State Income Tax Expense Net Of Federal Income Tax
AmountOfNetReductionToIncomeTaxExpenseFromStateIncomeTaxExpenseNetOfFederalIncomeTax
29000000 USD
CY2010 cnp Amount Of Non Cash Recorded To Income Tax Expense As Result Of Change In Tax Law
AmountOfNonCashRecordedToIncomeTaxExpenseAsResultOfChangeInTaxLaw
21000000 USD
CY2010Q4 cnp Amount Of Reduction To Deferred Tax Assets Due To Actuarially Determined Net Present Value Of Lost Future Health Care Deductions
AmountOfReductionToDeferredTaxAssetsDueToActuariallyDeterminedNetPresentValueOfLostFutureHealthCareDeductions
32000000 USD
CY2010 cnp Amount Of Reduction To Deferred Tax Assets Recorded To Income Tax Expense Due To Actuarially Determined Net Present Value Of Lost Future Health Care Deductions
AmountOfReductionToDeferredTaxAssetsRecordedToIncomeTaxExpenseDueToActuariallyDeterminedNetPresentValueOfLostFutureHealthCareDeductions
21000000 USD
CY2012 cnp Annualized Individual Discount Rates Based On Time Period Maximum
AnnualizedIndividualDiscountRatesBasedOnTimePeriodMaximum
P99Y
CY2012 cnp Annualized Individual Discount Rates Based On Time Period Minimum
AnnualizedIndividualDiscountRatesBasedOnTimePeriodMinimum
P6M
CY2012 cnp Bifurcated Debt Annual Accretion Rate
BifurcatedDebtAnnualAccretionRate
0.173
CY2012Q4 cnp Capital Stock Shares Authorized
CapitalStockSharesAuthorized
1020000000 shares
CY2010Q4 cnp Capitalized Interest And Allowance For Funds Used During Construction
CapitalizedInterestAndAllowanceForFundsUsedDuringConstruction
9000000 USD
CY2011Q4 cnp Capitalized Interest And Allowance For Funds Used During Construction
CapitalizedInterestAndAllowanceForFundsUsedDuringConstruction
4000000 USD
CY2012Q4 cnp Capitalized Interest And Allowance For Funds Used During Construction
CapitalizedInterestAndAllowanceForFundsUsedDuringConstruction
9000000 USD
CY2011Q4 cnp Cash And Cash Equivalents Held To Support Servicing Transition And System Restoration Bonds
CashAndCashEquivalentsHeldToSupportServicingTransitionAndSystemRestorationBonds
220000000 USD
CY2012Q4 cnp Cash And Cash Equivalents Held To Support Servicing Transition And System Restoration Bonds
CashAndCashEquivalentsHeldToSupportServicingTransitionAndSystemRestorationBonds
266000000 USD
CY2011Q4 cnp Cash Collateral Posted With Counterparties
CashCollateralPostedWithCounterparties
56000000 USD
CY2012Q4 cnp Cash Collateral Posted With Counterparties
CashCollateralPostedWithCounterparties
9000000 USD
CY2012 cnp Cash Equivalents Length Of Time To Maturity To Be Classified As Cash Equivalent
CashEquivalentsLengthOfTimeToMaturityToBeClassifiedAsCashEquivalent
P3M
CY2011 cnp Cash Received From Doe Grant
CashReceivedFromDoeGrant
110000000 USD
CY2012 cnp Cash Received From Doe Grant
CashReceivedFromDoeGrant
0 USD
CY2010 cnp Cash Received From Doe Grant
CashReceivedFromDoeGrant
90000000 USD
CY2012Q4 cnp Collateral Netting
CollateralNetting
9000000 USD
CY2011Q4 cnp Collateral Netting
CollateralNetting
56000000 USD
CY2011 cnp Decrease In Income Tax Expense For Release Of Accrued Interest Expense
DecreaseInIncomeTaxExpenseForReleaseOfAccruedInterestExpense
9000000 USD
CY2012Q4 cnp Deferred Tax Assets Current Other
DeferredTaxAssetsCurrentOther
1000000 USD
CY2011Q4 cnp Deferred Tax Assets Current Other
DeferredTaxAssetsCurrentOther
7000000 USD
CY2012Q4 cnp Deferred Tax Assets Loss And Credit Tax Carryforwards
DeferredTaxAssetsLossAndCreditTaxCarryforwards
90000000 USD
CY2011Q4 cnp Deferred Tax Assets Loss And Credit Tax Carryforwards
DeferredTaxAssetsLossAndCreditTaxCarryforwards
214000000 USD
CY2012Q4 cnp Deferred Tax Assets Noncurrent Other
DeferredTaxAssetsNoncurrentOther
64000000 USD
CY2011Q4 cnp Deferred Tax Assets Noncurrent Other
DeferredTaxAssetsNoncurrentOther
68000000 USD
CY2011Q4 cnp Deferred Tax Liabilities Deferred Gas Costs
DeferredTaxLiabilitiesDeferredGasCosts
0 USD
CY2012Q4 cnp Deferred Tax Liabilities Deferred Gas Costs
DeferredTaxLiabilitiesDeferredGasCosts
25000000 USD
CY2011Q4 cnp Deferred Tax Liabilities Depreciation
DeferredTaxLiabilitiesDepreciation
2849000000 USD
CY2012Q4 cnp Deferred Tax Liabilities Depreciation
DeferredTaxLiabilitiesDepreciation
3279000000 USD
CY2011Q4 cnp Deferred Tax Liabilities Noncurrent Other
DeferredTaxLiabilitiesNoncurrentOther
125000000 USD
CY2012Q4 cnp Deferred Tax Liabilities Noncurrent Other
DeferredTaxLiabilitiesNoncurrentOther
131000000 USD
CY2012Q4 cnp Deferred Tax Liabilities Unrealized Gains On Indexed Debt Securities
DeferredTaxLiabilitiesUnrealizedGainsOnIndexedDebtSecurities
439000000 USD
CY2011Q4 cnp Deferred Tax Liabilities Unrealized Gains On Indexed Debt Securities
DeferredTaxLiabilitiesUnrealizedGainsOnIndexedDebtSecurities
427000000 USD
CY2011Q4 cnp Deferred Tax Liabilities Unrealized Gains On Marketable Securities
DeferredTaxLiabilitiesUnrealizedGainsOnMarketableSecurities
97000000 USD
CY2012Q4 cnp Deferred Tax Liabilities Unrealized Gains On Marketable Securities
DeferredTaxLiabilitiesUnrealizedGainsOnMarketableSecurities
151000000 USD
CY2012 cnp Defined Benefit Pension Plan Vesting Period
DefinedBenefitPensionPlanVestingPeriod
three
CY2012Q4 cnp Defined Benefit Plan Common Collective Funds Percentage Of Emerging Market Equities
DefinedBenefitPlanCommonCollectiveFundsPercentageOfEmergingMarketEquities
0.05
CY2011Q4 cnp Defined Benefit Plan Common Collective Funds Percentage Of Fixed Income Securities
DefinedBenefitPlanCommonCollectiveFundsPercentageOfFixedIncomeSecurities
0.39
CY2012Q4 cnp Defined Benefit Plan Common Collective Funds Percentage Of Fixed Income Securities
DefinedBenefitPlanCommonCollectiveFundsPercentageOfFixedIncomeSecurities
0.42
CY2012Q4 cnp Defined Benefit Plan Common Collective Funds Percentage Of International Equities
DefinedBenefitPlanCommonCollectiveFundsPercentageOfInternationalEquities
0.26
CY2011Q4 cnp Defined Benefit Plan Common Collective Funds Percentage Of International Equities
DefinedBenefitPlanCommonCollectiveFundsPercentageOfInternationalEquities
0.31
CY2011Q4 cnp Defined Benefit Plan Common Collective Funds Percentage Of Us Equities
DefinedBenefitPlanCommonCollectiveFundsPercentageOfUsEquities
0.30
CY2012Q4 cnp Defined Benefit Plan Common Collective Funds Percentage Of Us Equities
DefinedBenefitPlanCommonCollectiveFundsPercentageOfUsEquities
0.27
CY2012Q4 cnp Defined Benefit Plan Mutual Funds Percentage Of Emerging Market Equities
DefinedBenefitPlanMutualFundsPercentageOfEmergingMarketEquities
0.33
CY2011Q4 cnp Defined Benefit Plan Mutual Funds Percentage Of Fixed Income Securities
DefinedBenefitPlanMutualFundsPercentageOfFixedIncomeSecurities
0.75
CY2012Q4 cnp Defined Benefit Plan Mutual Funds Percentage Of International Equities
DefinedBenefitPlanMutualFundsPercentageOfInternationalEquities
0.58
CY2012Q4 cnp Defined Benefit Plan Mutual Funds Percentage Of Us Equities
DefinedBenefitPlanMutualFundsPercentageOfUsEquities
0.09
CY2011Q4 cnp Defined Benefit Plan Mutual Funds Percentage Of Us Equities
DefinedBenefitPlanMutualFundsPercentageOfUsEquities
0.25
CY2012 cnp Defined Benefit Plan Percentage Vested
DefinedBenefitPlanPercentageVested
1.00
CY2012Q4 cnp Defined Benefit Plan Retirement Benefit Eligible Earnings Increased Percentage
DefinedBenefitPlanRetirementBenefitEligibleEarningsIncreasedPercentage
0.05
CY2012 cnp Defined Benefit Plan Transition Obligation Amortization Period
DefinedBenefitPlanTransitionObligationAmortizationPeriod
20 years
CY2011Q4 cnp Derivative Assets Investment Grade Non Trading
DerivativeAssetsInvestmentGradeNonTrading
1000000 USD
CY2012Q4 cnp Derivative Assets Investment Grade Non Trading
DerivativeAssetsInvestmentGradeNonTrading
1000000 USD
CY2012Q4 cnp Derivative Assets Non Trading
DerivativeAssetsNonTrading
42000000 USD
CY2011Q4 cnp Derivative Assets Non Trading
DerivativeAssetsNonTrading
107000000 USD
CY2012 cnp Derivative Gross Volume Basis Swaps Long Position
DerivativeGrossVolumeBasisSwapsLongPosition
73000 MMcf
CY2011 cnp Derivative Gross Volume Basis Swaps Long Position
DerivativeGrossVolumeBasisSwapsLongPosition
74000 MMcf
CY2011 cnp Derivative Gross Volume Long Position
DerivativeGrossVolumeLongPosition
84000 MMcf
CY2012 cnp Derivative Gross Volume Long Position
DerivativeGrossVolumeLongPosition
101000 MMcf
CY2011 cnp Derivative Gross Volume Segment Long Position
DerivativeGrossVolumeSegmentLongPosition
6000 MMcf
CY2012 cnp Derivative Gross Volumes On Natural Gas Contracts
DerivativeGrossVolumesOnNaturalGasContracts
489000 MMcf
CY2011 cnp Derivative Gross Volumes On Natural Gas Contracts
DerivativeGrossVolumesOnNaturalGasContracts
633000 MMcf
CY2012 cnp Description Of Company Match Under Savings Plan
DescriptionOfCompanyMatchUnderSavingsPlan
100% of the first 6% of each employee’s compensation contributed
CY2012Q4 cnp Dollar Face Amount Of Individual Note
DollarFaceAmountOfIndividualNote
1000 USD
CY2011Q4 cnp Equity Return Portion Of Recoverable True Up Balance After Tax
EquityReturnPortionOfRecoverableTrueUpBalanceAfterTax
258000000 USD
CY2011Q4 cnp Equity Return Portion Of Recoverable True Up Balance Pre Tax
EquityReturnPortionOfRecoverableTrueUpBalancePreTax
405000000 USD
CY2012Q4 cnp Fair Market Value Of Referenced Shares Attributable To Zero Premium Exchangeable Subordinated Notes
FairMarketValueOfReferencedSharesAttributableToZeroPremiumExchangeableSubordinatedNotes
540000000 USD
CY2011Q4 cnp Fair Value Assets Measured On Recurring Basis Corporate Equities
FairValueAssetsMeasuredOnRecurringBasisCorporateEquities
387000000 USD
CY2012Q4 cnp Fair Value Assets Measured On Recurring Basis Corporate Equities
FairValueAssetsMeasuredOnRecurringBasisCorporateEquities
542000000 USD
CY2012Q4 cnp Federal Benefit Deductibility Of Interest
FederalBenefitDeductibilityOfInterest
5000000 USD
CY2011 cnp Gain Loss On Indexed Debt Securities
GainLossOnIndexedDebtSecurities
35000000 USD
CY2010 cnp Gain Loss On Indexed Debt Securities
GainLossOnIndexedDebtSecurities
-31000000 USD
CY2012 cnp Gain Loss On Indexed Debt Securities
GainLossOnIndexedDebtSecurities
-71000000 USD
CY2011 cnp Gas Transportation Revenue
GasTransportationRevenue
824000000 USD
CY2012 cnp Gas Transportation Revenue
GasTransportationRevenue
847000000 USD
CY2010 cnp Gas Transportation Revenue
GasTransportationRevenue
785000000 USD
CY2012Q4 cnp Guarantee Obligations Collateral Returned
GuaranteeObligationsCollateralReturned
28000000 USD
CY2010 cnp Income Tax Reconciliation Change In Tax Expense
IncomeTaxReconciliationChangeInTaxExpense
16000000 USD
CY2012 cnp Income Tax Reconciliation Change In Tax Expense
IncomeTaxReconciliationChangeInTaxExpense
75000000 USD
CY2011 cnp Income Tax Reconciliation Change In Tax Expense
IncomeTaxReconciliationChangeInTaxExpense
-7000000 USD
CY2010 cnp Income Tax Reconciliation Tax Settlements And Uncertain Income Tax Positions
IncomeTaxReconciliationTaxSettlementsAndUncertainIncomeTaxPositions
14000000 USD
CY2011 cnp Income Tax Reconciliation Tax Settlements And Uncertain Income Tax Positions
IncomeTaxReconciliationTaxSettlementsAndUncertainIncomeTaxPositions
-5000000 USD
CY2012 cnp Income Tax Reconciliation Tax Settlements And Uncertain Income Tax Positions
IncomeTaxReconciliationTaxSettlementsAndUncertainIncomeTaxPositions
-33000000 USD
CY2010 cnp Increase Decrease Interest And Taxes Accrued
IncreaseDecreaseInterestAndTaxesAccrued
-2000000 USD
CY2012 cnp Increase Decrease Interest And Taxes Accrued
IncreaseDecreaseInterestAndTaxesAccrued
-62000000 USD
CY2011 cnp Increase Decrease Interest And Taxes Accrued
IncreaseDecreaseInterestAndTaxesAccrued
44000000 USD
CY2010 cnp Increase In Income Tax Expense Related To Uncertain Tax Positions
IncreaseInIncomeTaxExpenseRelatedToUncertainTaxPositions
5000000 USD
CY2010 cnp Increased Decreased Expense From Natural Gas Derivatives Unrealized Losses Gains
IncreasedDecreasedExpenseFromNaturalGasDerivativesUnrealizedLossesGains
14000000 USD
CY2012 cnp Increased Decreased Expense From Natural Gas Derivatives Unrealized Losses Gains
IncreasedDecreasedExpenseFromNaturalGasDerivativesUnrealizedLossesGains
-52000000 USD
CY2011 cnp Increased Decreased Expense From Natural Gas Derivatives Unrealized Losses Gains
IncreasedDecreasedExpenseFromNaturalGasDerivativesUnrealizedLossesGains
30000000 USD
CY2012 cnp Increased Decreased Sales Revenue From Natural Gas Derivatives Unrealized Gains Losses
IncreasedDecreasedSalesRevenueFromNaturalGasDerivativesUnrealizedGainsLosses
-68000000 USD
CY2010 cnp Increased Decreased Sales Revenue From Natural Gas Derivatives Unrealized Gains Losses
IncreasedDecreasedSalesRevenueFromNaturalGasDerivativesUnrealizedGainsLosses
18000000 USD
CY2011 cnp Increased Decreased Sales Revenue From Natural Gas Derivatives Unrealized Gains Losses
IncreasedDecreasedSalesRevenueFromNaturalGasDerivativesUnrealizedGainsLosses
38000000 USD
CY2011Q4 cnp Indexed Debt Current
IndexedDebtCurrent
131000000 USD
CY2012Q4 cnp Indexed Debt Current
IndexedDebtCurrent
138000000 USD
CY2010Q4 cnp Indexed Debt Current
IndexedDebtCurrent
126000000 USD
CY2009Q4 cnp Indexed Debt Current
IndexedDebtCurrent
121000000 USD
CY2012Q4 cnp Indexed Debt Securities Derivative
IndexedDebtSecuritiesDerivative
268000000 USD
CY2011Q4 cnp Indexed Debt Securities Derivative
IndexedDebtSecuritiesDerivative
197000000 USD
CY2009Q4 cnp Indexed Debt Securities Derivative
IndexedDebtSecuritiesDerivative
201000000 USD
CY2010Q4 cnp Indexed Debt Securities Derivative
IndexedDebtSecuritiesDerivative
232000000 USD
CY2004Q1 cnp Initial Amount Of True Up Application
InitialAmountOfTrueUpApplication
3700000000 USD
CY2011 cnp Interest On Transition And System Restoration Bonds
InterestOnTransitionAndSystemRestorationBonds
127000000 USD
CY2012 cnp Interest On Transition And System Restoration Bonds
InterestOnTransitionAndSystemRestorationBonds
147000000 USD
CY2010 cnp Interest On Transition And System Restoration Bonds
InterestOnTransitionAndSystemRestorationBonds
140000000 USD
CY2010 cnp Interest Paid Debt Component Indexed Debt Securities
InterestPaidDebtComponentIndexedDebtSecurities
17000000 USD
CY2011 cnp Interest Paid Debt Component Indexed Debt Securities
InterestPaidDebtComponentIndexedDebtSecurities
17000000 USD
CY2012 cnp Interest Paid Debt Component Indexed Debt Securities
InterestPaidDebtComponentIndexedDebtSecurities
17000000 USD
CY2012 cnp Length Of Agreements Including Severance Benefits
LengthOfAgreementsIncludingSeveranceBenefits
one-year
CY2012 cnp Length Of Interstate Natural Gas Pipeline Owned By Affiliate1
LengthOfInterstateNaturalGasPipelineOwnedByAffiliate1
274
CY2012Q4 cnp Loss Contingency Defendants Dismissed
LossContingencyDefendantsDismissed
2
CY2012Q4 cnp Loss Contingency Kansas Gas Measurement Lawsuit Defendants
LossContingencyKansasGasMeasurementLawsuitDefendants
245
CY2012Q4 cnp Loss Contingency Lawsuit Amendments
LossContingencyLawsuitAmendments
4
CY2012Q4 cnp Loss Contingency Pending Gas Market Manipulation Lawsuits Number
LossContingencyPendingGasMarketManipulationLawsuitsNumber
2
CY2012Q4 cnp Loss Contingency Pending Measurement Lawsuit
LossContingencyPendingMeasurementLawsuit
1
CY2012Q4 cnp Loss Contingency Pending Natural Gas Measurement Lawsuits Number
LossContingencyPendingNaturalGasMeasurementLawsuitsNumber
2
CY2012Q4 cnp Loss Contingency Term Of Allegations
LossContingencyTermOfAllegations
25 Years
CY2012Q4 cnp Loss Contingency Total Gas Market Manipulation Cases
LossContingencyTotalGasMarketManipulationCases
30
CY2012 cnp Maximum Number Of Times Annual Salary Included In Severance Benefits
MaximumNumberOfTimesAnnualSalaryIncludedInSeveranceBenefits
3
CY2012 cnp Maximum Ownership Interest Percentage For Investments Recorded Using Entity Method
MaximumOwnershipInterestPercentageForInvestmentsRecordedUsingEntityMethod
0.50
CY2012 cnp Maximum Percentage Of Employee Compensation Eligible For Contribution To Savings Plan
MaximumPercentageOfEmployeeCompensationEligibleForContributionToSavingsPlan
0.50
CY2012 cnp Minimum Ownership Interest Percentage For Investments Recorded Using Entity Method
MinimumOwnershipInterestPercentageForInvestmentsRecordedUsingEntityMethod
0.20
CY2011 cnp Minimum Total Common Stock Dividends Declared During Three Year Vesting Period
MinimumTotalCommonStockDividendsDeclaredDuringThreeYearVestingPeriod
2.37
CY2012 cnp Minimum Total Common Stock Dividends Declared During Three Year Vesting Period
MinimumTotalCommonStockDividendsDeclaredDuringThreeYearVestingPeriod
2.43
CY2010 cnp Minimum Total Common Stock Dividends Declared During Three Year Vesting Period
MinimumTotalCommonStockDividendsDeclaredDuringThreeYearVestingPeriod
2.34
CY2010 cnp Non Qualified Deferred Compensation Plan Benefit Expense
NonQualifiedDeferredCompensationPlanBenefitExpense
5000000 USD
CY2012 cnp Non Qualified Deferred Compensation Plan Benefit Expense
NonQualifiedDeferredCompensationPlanBenefitExpense
5000000 USD
CY2011 cnp Non Qualified Deferred Compensation Plan Benefit Expense
NonQualifiedDeferredCompensationPlanBenefitExpense
5000000 USD
CY2012Q4 cnp Number Of Consolidated Variable Interest Entities
NumberOfConsolidatedVariableInterestEntities
5
CY2012Q4 cnp Number Of Shares In Common Stock Held By Savings Plan
NumberOfSharesInCommonStockHeldBySavingsPlan
19494130 shares
CY2010 cnp Operation And Maintenance
OperationAndMaintenance
1719000000 USD
CY2011 cnp Operation And Maintenance
OperationAndMaintenance
1835000000 USD
CY2012 cnp Operation And Maintenance
OperationAndMaintenance
1874000000 USD
CY2011Q4 cnp Other Non Qualified Plans Benefit Obligations Deferred Compensation
OtherNonQualifiedPlansBenefitObligationsDeferredCompensation
76000000 USD
CY2012Q4 cnp Other Non Qualified Plans Benefit Obligations Deferred Compensation
OtherNonQualifiedPlansBenefitObligationsDeferredCompensation
71000000 USD
CY2011Q4 cnp Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent Split Dollar Life Insurance
PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrentSplitDollarLifeInsurance
25000000 USD
CY2012Q4 cnp Pension And Other Postretirement Defined Benefit Plans Liabilities Noncurrent Split Dollar Life Insurance
PensionAndOtherPostretirementDefinedBenefitPlansLiabilitiesNoncurrentSplitDollarLifeInsurance
29000000 USD
CY2012Q4 cnp Percentage Of Investment In Common Stocks
PercentageOfInvestmentInCommonStocks
0.22
CY2010 cnp Postemployment Benefits Income In Period
PostemploymentBenefitsIncomeInPeriod
1000000 USD
CY2011 cnp Postemployment Benefits Income In Period
PostemploymentBenefitsIncomeInPeriod
-7000000 USD
CY2012 cnp Postemployment Benefits Income In Period
PostemploymentBenefitsIncomeInPeriod
-8000000 USD
CY2011Q4 cnp Postretirement Plan Mutual Funds Percentage Of Fixed Income Securities
PostretirementPlanMutualFundsPercentageOfFixedIncomeSecurities
0.73
CY2012Q4 cnp Postretirement Plan Mutual Funds Percentage Of Fixed Income Securities
PostretirementPlanMutualFundsPercentageOfFixedIncomeSecurities
0.73
CY2012Q4 cnp Postretirement Plan Mutual Funds Percentage Of Us Equities
PostretirementPlanMutualFundsPercentageOfUsEquities
0.19
CY2011Q4 cnp Postretirement Plan Mutual Funds Percentage Of Us Equities
PostretirementPlanMutualFundsPercentageOfUsEquities
0.19
CY2011Q4 cnp Postretirement Plan Mutual Funds Percentage Of Us International Equities
PostretirementPlanMutualFundsPercentageOfUsInternationalEquities
0.08
CY2012Q4 cnp Postretirement Plan Mutual Funds Percentage Of Us International Equities
PostretirementPlanMutualFundsPercentageOfUsInternationalEquities
0.08
CY2012 cnp Site Contingency Estimated Time Frame To Resolve Contingency Low Estimate
SiteContingencyEstimatedTimeFrameToResolveContingencyLowEstimate
30 Years
CY2012Q4 cnp Removal Costs Recognized As Component Of Depreciation Expense
RemovalCostsRecognizedAsComponentOfDepreciationExpense
919000000 USD
CY2011Q4 cnp Removal Costs Recognized As Component Of Depreciation Expense
RemovalCostsRecognizedAsComponentOfDepreciationExpense
912000000 USD
CY2012Q4 cnp Replacement Fund Requirements
ReplacementFundRequirements
189000000 USD
CY2011 cnp Retail Gas Revenue
RetailGasRevenue
4019000000 USD
CY2012 cnp Retail Gas Revenue
RetailGasRevenue
3328000000 USD
CY2010 cnp Retail Gas Revenue
RetailGasRevenue
4412000000 USD
CY2010 cnp Return On True Up Balance
ReturnOnTrueUpBalance
0 USD
CY2012 cnp Return On True Up Balance
ReturnOnTrueUpBalance
0 USD
CY2011 cnp Return On True Up Balance
ReturnOnTrueUpBalance
352000000 USD
CY2011Q3 cnp Return On True Up Balance
ReturnOnTrueUpBalance
352000000 USD
CY2011Q3 cnp Return On True Up Balance After Tax
ReturnOnTrueUpBalanceAfterTax
224000000 USD
CY2012 cnp Sales Revenue Energy Products And Services
SalesRevenueEnergyProductsAndServices
124000000 USD
CY2011 cnp Sales Revenue Energy Products And Services
SalesRevenueEnergyProductsAndServices
121000000 USD
CY2010 cnp Sales Revenue Energy Products And Services
SalesRevenueEnergyProductsAndServices
133000000 USD
CY2012 cnp Savings Plan Benefit Expense
SavingsPlanBenefitExpense
36000000 USD
CY2011 cnp Savings Plan Benefit Expense
SavingsPlanBenefitExpense
35000000 USD
CY2010 cnp Savings Plan Benefit Expense
SavingsPlanBenefitExpense
34000000 USD
CY2011 cnp Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalGrantDateFairValue
12000000 USD
CY2012 cnp Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalGrantDateFairValue
19000000 USD
CY2010 cnp Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Vested In Period Total Grant Date Fair Value
ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodTotalGrantDateFairValue
10000000 USD
CY2011Q4 cnp Short Term Borrowings And Current Portion Long Term Debt
ShortTermBorrowingsAndCurrentPortionLongTermDebt
546000000 USD
CY2012Q4 cnp Short Term Borrowings And Current Portion Long Term Debt
ShortTermBorrowingsAndCurrentPortionLongTermDebt
1438000000 USD
CY2012Q4 cnp Sinking Fund Requirements
SinkingFundRequirements
3000000 USD
CY2012Q4 cnp Site Contingency Completed Remediation
SiteContingencyCompletedRemediation
2
CY2012 cnp Site Contingency Estimated Time Frame To Resolve Contingency High Estimate
SiteContingencyEstimatedTimeFrameToResolveContingencyHighEstimate
50 Years
CY2012 cnp Site Contingency Loss Exposure High Estimate
SiteContingencyLossExposureHighEstimate
41000000 USD
CY2012 cnp Site Contingency Loss Exposure Low Estimate
SiteContingencyLossExposureLowEstimate
6000000 USD
CY2012Q4 cnp Site Contingency Remaining Minnesota Sites
SiteContingencyRemainingMinnesotaSites
5
CY2012Q4 cnp Site Contingency Sites Without Liability
SiteContingencySitesWithoutLiability
2
CY2012Q4 cnp Special Purpose Subsidiaries
SpecialPurposeSubsidiaries
5
CY2012Q4 cnp Subordinated Note Cash Exchange Amount Per Each Original Note
SubordinatedNoteCashExchangeAmountPerEachOriginalNote
611 USD
CY2012 cnp Subordinated Note Cash Exchangeable Percentage Of Fair Value
SubordinatedNoteCashExchangeablePercentageOfFairValue
0.95
CY2012Q4 cnp Target Annual Yield On Referenced Shares Before Increase Or Decrease Of Principal Amount Of Subordinated Note
TargetAnnualYieldOnReferencedSharesBeforeIncreaseOrDecreaseOfPrincipalAmountOfSubordinatedNote
0.02309
CY2010 cnp Tax Law Change In Deductibility Of Retiree Health Care Costs
TaxLawChangeInDeductibilityOfRetireeHealthCareCosts
20000000 USD
CY2011 cnp Tax Law Change In Deductibility Of Retiree Health Care Costs
TaxLawChangeInDeductibilityOfRetireeHealthCareCosts
0 USD
CY2012 cnp Tax Law Change In Deductibility Of Retiree Health Care Costs
TaxLawChangeInDeductibilityOfRetireeHealthCareCosts
0 USD
CY2012Q4 cnp Transition And System Restoration Bond Maturities Repayments Of Principal In Next Twelve Months
TransitionAndSystemRestorationBondMaturitiesRepaymentsOfPrincipalInNextTwelveMonths
447000000 USD
CY2012Q4 cnp Transition And System Restoration Bond Maturities Repayments Of Principal In Year Five
TransitionAndSystemRestorationBondMaturitiesRepaymentsOfPrincipalInYearFive
411000000 USD
CY2012Q4 cnp Transition And System Restoration Bond Maturities Repayments Of Principal In Year Four
TransitionAndSystemRestorationBondMaturitiesRepaymentsOfPrincipalInYearFour
391000000 USD
CY2012Q4 cnp Transition And System Restoration Bond Maturities Repayments Of Principal In Year Three
TransitionAndSystemRestorationBondMaturitiesRepaymentsOfPrincipalInYearThree
372000000 USD
CY2012Q4 cnp Transition And System Restoration Bond Maturities Repayments Of Principal In Year Two
TransitionAndSystemRestorationBondMaturitiesRepaymentsOfPrincipalInYearTwo
354000000 USD
CY2011Q4 cnp Transition And System Restoration Bonds Long Term Debt Current
TransitionAndSystemRestorationBondsLongTermDebtCurrent
307000000 USD
CY2012Q4 cnp Transition And System Restoration Bonds Long Term Debt Current
TransitionAndSystemRestorationBondsLongTermDebtCurrent
447000000 USD
CY2012Q4 cnp Transition And System Restoration Bonds Long Term Debt Non Current
TransitionAndSystemRestorationBondsLongTermDebtNonCurrent
3400000000 USD
CY2011Q4 cnp Transition And System Restoration Bonds Long Term Debt Non Current
TransitionAndSystemRestorationBondsLongTermDebtNonCurrent
2215000000 USD
CY2011 cnp Unrealized Loss Gain On Indexed Debt Securities
UnrealizedLossGainOnIndexedDebtSecurities
35000000 USD
CY2012 cnp Unrealized Loss Gain On Indexed Debt Securities
UnrealizedLossGainOnIndexedDebtSecurities
-71000000 USD
CY2010 cnp Unrealized Loss Gain On Indexed Debt Securities
UnrealizedLossGainOnIndexedDebtSecurities
-31000000 USD
CY2012Q4 cnp Unrecognized Amount Of Allowed Equity Return
UnrecognizedAmountOfAllowedEquityReturn
553000000 USD
CY2010 cnp Unrecognized Tax Benefits Resulting From Settlements With Taxing Authorities
UnrecognizedTaxBenefitsResultingFromSettlementsWithTaxingAuthorities
0 USD
CY2011 cnp Unrecognized Tax Benefits Resulting From Settlements With Taxing Authorities
UnrecognizedTaxBenefitsResultingFromSettlementsWithTaxingAuthorities
1000000 USD
CY2012 cnp Unrecognized Tax Benefits Resulting From Settlements With Taxing Authorities
UnrecognizedTaxBenefitsResultingFromSettlementsWithTaxingAuthorities
-1000000 USD
CY2012 cnp Weather Hedge Maximum Payment Limit
WeatherHedgeMaximumPaymentLimit
11000000 USD
CY2012 cnp Weather Hedges Term
WeatherHedgesTerm
10 Years
CY2011 cnp Weather Hedges Term
WeatherHedgesTerm
10
CY2010 cnp Weather Hedges Term
WeatherHedgesTerm
10
CY2012 cnp Wholesale Gas Revenue
WholesaleGasRevenue
613000000 USD
CY2011 cnp Wholesale Gas Revenue
WholesaleGasRevenue
1149000000 USD
CY2010 cnp Wholesale Gas Revenue
WholesaleGasRevenue
1250000000 USD
CY2012Q4 cnp Zero Premium Exchangeable Subordinated Notes Contingent Principal Amount Outstanding
ZeroPremiumExchangeableSubordinatedNotesContingentPrincipalAmountOutstanding
784000000 USD
CY2012Q4 cnp Zero Premium Exchangeable Subordinated Notes Face Amount
ZeroPremiumExchangeableSubordinatedNotesFaceAmount
1000000000 USD
CY2012Q4 cnp Zero Premium Exchangeable Subordinated Notes Interest Rate Stated Percentage
ZeroPremiumExchangeableSubordinatedNotesInterestRateStatedPercentage
0.0200
CY2012 cnp Zero Premium Exchangeable Subordinated Notes Issuance Date
ZeroPremiumExchangeableSubordinatedNotesIssuanceDate
9/1/1999
CY2012 cnp Zero Premium Exchangeable Subordinated Notes Maturity Date
ZeroPremiumExchangeableSubordinatedNotesMaturityDate
2029
CY2012Q4 cnp Zero Premium Exchangeable Subordinated Notes Principal Outstanding
ZeroPremiumExchangeableSubordinatedNotesPrincipalOutstanding
840000000 USD
CY2012 dei Amendment Flag
AmendmentFlag
false
CY2012 dei Current Fiscal Year End Date
CurrentFiscalYearEndDate
--12-31
CY2012 dei Document Fiscal Period Focus
DocumentFiscalPeriodFocus
FY
CY2012 dei Document Fiscal Year Focus
DocumentFiscalYearFocus
2012
CY2012 dei Document Period End Date
DocumentPeriodEndDate
2012-12-31
CY2012 dei Document Type
DocumentType
10-K
CY2012 dei Entity Central Index Key
EntityCentralIndexKey
0001130310
CY2013Q1 dei Entity Common Stock Shares Outstanding
EntityCommonStockSharesOutstanding
427671739 shares
CY2012 dei Entity Current Reporting Status
EntityCurrentReportingStatus
Yes
CY2012 dei Entity Filer Category
EntityFilerCategory
Large Accelerated Filer
CY2012Q2 dei Entity Public Float
EntityPublicFloat
8760880387 USD
CY2012 dei Entity Registrant Name
EntityRegistrantName
CENTERPOINT ENERGY INC
CY2012 dei Entity Voluntary Filers
EntityVoluntaryFilers
No
CY2012 dei Entity Well Known Seasoned Issuer
EntityWellKnownSeasonedIssuer
Yes

Files In Submission

Name View Source Status
0001130310-13-000006-index-headers.html Edgar Link pending
0001130310-13-000006-index.html Edgar Link pending
0001130310-13-000006.txt Edgar Link pending
0001130310-13-000006-xbrl.zip Edgar Link pending
cnp-20121231.xml Edgar Link completed
cnp-20121231.xsd Edgar Link pending
cnp-20121231_cal.xml Edgar Link unprocessable
cnp-20121231_def.xml Edgar Link unprocessable
cnp-20121231_lab.xml Edgar Link unprocessable
cnp-20121231_pre.xml Edgar Link unprocessable
cnp_10kx12312012.htm Edgar Link pending
cnp_exhibit10iix12312012.htm Edgar Link pending
cnp_exhibit10mmx12312012.htm Edgar Link pending
cnp_exhibit10sx12312012.htm Edgar Link pending
cnp_exhibit12x12312012.htm Edgar Link pending
cnp_exhibit21x12312012.htm Edgar Link pending
cnp_exhibit23x12312012.htm Edgar Link pending
cnp_exhibit311x12312012.htm Edgar Link pending
cnp_exhibit312x12312012.htm Edgar Link pending
cnp_exhibit321x12312012.htm Edgar Link pending
cnp_exhibit322x12312012.htm Edgar Link pending
cnp_exhibit4e33x12312012.htm Edgar Link pending
cnp_exhibit4e34x12312012.htm Edgar Link pending
FilingSummary.xml Edgar Link unprocessable
Financial_Report.xls Edgar Link pending
R1.htm Edgar Link pending
R10.htm Edgar Link pending
R11.htm Edgar Link pending
R12.htm Edgar Link pending
R13.htm Edgar Link pending
R14.htm Edgar Link pending
R15.htm Edgar Link pending
R16.htm Edgar Link pending
R17.htm Edgar Link pending
R18.htm Edgar Link pending
R19.htm Edgar Link pending
R2.htm Edgar Link pending
R20.htm Edgar Link pending
R21.htm Edgar Link pending
R22.htm Edgar Link pending
R23.htm Edgar Link pending
R24.htm Edgar Link pending
R25.htm Edgar Link pending
R26.htm Edgar Link pending
R27.htm Edgar Link pending
R28.htm Edgar Link pending
R29.htm Edgar Link pending
R3.htm Edgar Link pending
R30.htm Edgar Link pending
R31.htm Edgar Link pending
R32.htm Edgar Link pending
R33.htm Edgar Link pending
R34.htm Edgar Link pending
R35.htm Edgar Link pending
R36.htm Edgar Link pending
R37.htm Edgar Link pending
R38.htm Edgar Link pending
R39.htm Edgar Link pending
R4.htm Edgar Link pending
R40.htm Edgar Link pending
R41.htm Edgar Link pending
R42.htm Edgar Link pending
R43.htm Edgar Link pending
R44.htm Edgar Link pending
R45.htm Edgar Link pending
R46.htm Edgar Link pending
R47.htm Edgar Link pending
R48.htm Edgar Link pending
R49.htm Edgar Link pending
R5.htm Edgar Link pending
R50.htm Edgar Link pending
R51.htm Edgar Link pending
R52.htm Edgar Link pending
R53.htm Edgar Link pending
R54.htm Edgar Link pending
R55.htm Edgar Link pending
R56.htm Edgar Link pending
R57.htm Edgar Link pending
R58.htm Edgar Link pending
R59.htm Edgar Link pending
R6.htm Edgar Link pending
R60.htm Edgar Link pending
R61.htm Edgar Link pending
R62.htm Edgar Link pending
R63.htm Edgar Link pending
R64.htm Edgar Link pending
R65.htm Edgar Link pending
R66.htm Edgar Link pending
R67.htm Edgar Link pending
R68.htm Edgar Link pending
R69.htm Edgar Link pending
R7.htm Edgar Link pending
R70.htm Edgar Link pending
R71.htm Edgar Link pending
R72.htm Edgar Link pending
R8.htm Edgar Link pending
R9.htm Edgar Link pending
report.css Edgar Link pending
Show.js Edgar Link pending