Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ (15)	$ 18
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	5	(9)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(10)	9
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0	$ 2
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	(11)	(10)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	3	4
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(8)	(6)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(8)	(6)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(4)	28
Reclassification for Available for Sale Securities, Tax	2	(13)
Reclassification for Available for Sale Securities, After-Tax	(2)	15
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2)	15
Power [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(13)	10
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	5	(6)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(8)	4
Power [Member] \| Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0
Power [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	(9)	(9)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	3	4
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(6)	(5)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(6)	(5)
Power [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(4)	19
Reclassification for Available for Sale Securities, Tax	2	(10)
Reclassification for Available for Sale Securities, After-Tax	(2)	9
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2)	9
Non-Operating Pension and OPEB Credits (Costs) [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	1	2
Amortization of Prior Service (Cost) Credit, Tax	0	(1)
Amortization of Prior Service (Cost) Credit, After-Tax	1	1
Amortization of Actuarial Loss, Pre-Tax	(12)	(12)
Amortization of Actuarial Loss, Tax	3	5
Amortization of Actuarial Loss, After-Tax	(9)	(7)
Non-Operating Pension and OPEB Credits (Costs) [Member] \| Power [Member] \| Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	1	2
Amortization of Prior Service (Cost) Credit, Tax	0	(1)
Amortization of Prior Service (Cost) Credit, After-Tax	1	1
Amortization of Actuarial Loss, Pre-Tax	(10)	(11)
Amortization of Actuarial Loss, Tax	3	5
Amortization of Actuarial Loss, After-Tax	(7)	(6)
Net Gains (Losses) on Trust Investments [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(4)	28
Reclassification for Available for Sale Securities, Tax	2	(13)
Reclassification for Available for Sale Securities, After-Tax	(2)	15
Net Gains (Losses) on Trust Investments [Member] \| Power [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(4)	19
Reclassification for Available for Sale Securities, Tax	2	(10)
Reclassification for Available for Sale Securities, After-Tax	$ (2)	$ 9

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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan.

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Amount before tax of reclassification adjustment from accumulated other comprehensive income for unrealized gain (loss) realized upon the sale of available-for-sale securities.

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