XML 85 R80.htm IDEA: XBRL DOCUMENT v2.4.1.9
Accumulated Other Comprehensive Income (Loss), Net of Tax (Changes of AOCI) (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning Balance $ (283)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (95)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax $ (95)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
Other Comprehensive Income before Reclassifications 17us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax 6us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax  
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (4)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax 2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax  
Other Comprehensive Income (Loss), net of tax 13us-gaap_OtherComprehensiveIncomeLossNetOfTax 8us-gaap_OtherComprehensiveIncomeLossNetOfTax  
Accumulated Other Comprehensive Income (Loss), Ending Balance (270)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax (87)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax  
Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
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(2)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income before Reclassifications 1us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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(5)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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7us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Other Comprehensive Income (Loss), net of tax (9)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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2us-gaap_OtherComprehensiveIncomeLossNetOfTax
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0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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10us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Pension and OPEB Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning Balance (411)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(238)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(238)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income before Reclassifications 0us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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0us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 8us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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4us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other Comprehensive Income (Loss), net of tax 8us-gaap_OtherComprehensiveIncomeLossNetOfTax
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4us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Accumulated Other Comprehensive Income (Loss), Ending Balance (403)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(234)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Available-for-Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning Balance 118us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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145us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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145us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income before Reclassifications 16us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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11us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (2)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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(9)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other Comprehensive Income (Loss), net of tax 14us-gaap_OtherComprehensiveIncomeLossNetOfTax
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2us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Accumulated Other Comprehensive Income (Loss), Ending Balance 132us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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147us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Power [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning Balance (228)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(63)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(63)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income before Reclassifications 17us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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4us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (5)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
/ dei_LegalEntityAxis
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2us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other Comprehensive Income (Loss), net of tax 12us-gaap_OtherComprehensiveIncomeLossNetOfTax
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6us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Accumulated Other Comprehensive Income (Loss), Ending Balance (216)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(57)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Power [Member] | Cash Flow Hedges [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning Balance 11us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(1)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income before Reclassifications 1us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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(6)us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (10)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other Comprehensive Income (Loss), net of tax (9)us-gaap_OtherComprehensiveIncomeLossNetOfTax
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1us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Accumulated Other Comprehensive Income (Loss), Ending Balance 2us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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0us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Power [Member] | Pension and OPEB Plans [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning Balance (351)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(204)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(204)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income before Reclassifications 0us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) 7us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other Comprehensive Income (Loss), net of tax 7us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Accumulated Other Comprehensive Income (Loss), Ending Balance (344)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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(201)us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Power [Member] | Available-for-Sale Securities [Member]      
Accumulated Other Comprehensive Income (Loss) [Roll Forward]      
Accumulated Other Comprehensive Income (Loss), Beginning Balance 112us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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Other Comprehensive Income before Reclassifications 16us-gaap_OtherComprehensiveIncomeLossBeforeReclassificationsNetOfTax
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Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) (2)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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(8)us-gaap_ReclassificationFromAccumulatedOtherComprehensiveIncomeCurrentPeriodNetOfTax
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Other Comprehensive Income (Loss), net of tax 14us-gaap_OtherComprehensiveIncomeLossNetOfTax
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Accumulated Other Comprehensive Income (Loss), Ending Balance $ 126us-gaap_AccumulatedOtherComprehensiveIncomeLossNetOfTax
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