Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ (6)	$ (15)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	2	5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	(10)
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0	$ 0
Pension and OPEB Plans [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax	(5)	(11)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	2	3
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(3)	(8)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(3)	(8)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(1)	(4)
Reclassification for Available for Sale Securities, Tax	0	2
Reclassification for Available for Sale Securities, After-Tax	(1)	(2)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	(2)
Power [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(5)	(13)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	1	5
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(4)	(8)
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	(4)	(9)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	1	3
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(3)	(6)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(3)	(6)
Power [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(1)	(4)
Reclassification for Available for Sale Securities, Tax	0	2
Reclassification for Available for Sale Securities, After-Tax	(1)	(2)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	(2)
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	7	1
Amortization of Prior Service (Cost) Credit, Tax	(2)	0
Amortization of Prior Service (Cost) Credit, After-Tax	5	1
Amortization of Actuarial Loss, Pre-Tax	(12)	(12)
Amortization of Actuarial Loss, Tax	4	3
Amortization of Actuarial Loss, After-Tax	(8)	(9)
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	6	1
Amortization of Prior Service (Cost) Credit, Tax	(2)	0
Amortization of Prior Service (Cost) Credit, After-Tax	4	1
Amortization of Actuarial Loss, Pre-Tax	(10)	(10)
Amortization of Actuarial Loss, Tax	3	3
Amortization of Actuarial Loss, After-Tax	(7)	(7)
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	(1)	(4)
Reclassification for Available for Sale Securities, Tax	0	2
Reclassification for Available for Sale Securities, After-Tax	(1)	(2)
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	(1)	(4)
Reclassification for Available for Sale Securities, Tax	0	2
Reclassification for Available for Sale Securities, After-Tax	$ (1)	$ (2)

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