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Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax

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

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Amount of tax (expense) benefit 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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Amount after 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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Amount of tax expense (benefit) 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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Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net period benefit cost (credit) of defined benefit plan.

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

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Amount of tax expense (benefit) of reclassification adjustment from accumulated other comprehensive income (loss) for gain (loss) of defined benefit plan.

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Amount, after tax, of reclassification adjustment from accumulated other comprehensive (income) loss for net periodic benefit cost (credit) of defined benefit plan.

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Amount of tax (expense) benefit for reclassification adjustment from accumulated other comprehensive (income) loss of defined benefit plan.

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount after tax of reclassification adjustments of other comprehensive income (loss).

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Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications of AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	$ (12)	$ 15	$ (27)	$ 33
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	4	(8)	9	(17)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(8)	7	(18)	16
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	0	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	(10)	(10)	(21)	(20)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	3	4	6	8
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(7)	(6)	(15)	(12)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(7)	(6)	(15)	(12)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(2)	25	(6)	53
Reclassification for Available for Sale Securities, Tax	1	(12)	3	(25)
Reclassification for Available for Sale Securities, After-Tax	(1)	13	(3)	28
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	13	(3)	28
Power [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(10)	16	(23)	26
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	3	(9)	8	(15)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(7)	7	(15)	11
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	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	(8)	(8)	(17)	(17)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	2	3	5	7
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(6)	(5)	(12)	(10)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(6)	(5)	(12)	(10)
Power [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(2)	24	(6)	43
Reclassification for Available for Sale Securities, Tax	1	(12)	3	(22)
Reclassification for Available for Sale Securities, After-Tax	(1)	12	(3)	21
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	12	(3)	21
Operation and Maintenance Expense [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	(11)	(12)
Amortization of Actuarial Loss, Tax	3	5
Amortization of Actuarial Loss, After-Tax	(8)	(7)
Operation and Maintenance Expense [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	(9)	(10)
Amortization of Actuarial Loss, Tax	2	4
Amortization of Actuarial Loss, After-Tax	(7)	(6)
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			2	4
Amortization of Prior Service (Cost) Credit, Tax			0	(2)
Amortization of Prior Service (Cost) Credit, After-Tax			2	2
Amortization of Actuarial Loss, Pre-Tax			(23)	(24)
Amortization of Actuarial Loss, Tax			6	10
Amortization of Actuarial Loss, After-Tax			(17)	(14)
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			2	4
Amortization of Prior Service (Cost) Credit, Tax			0	(2)
Amortization of Prior Service (Cost) Credit, After-Tax			2	2
Amortization of Actuarial Loss, Pre-Tax			(19)	(21)
Amortization of Actuarial Loss, Tax			5	9
Amortization of Actuarial Loss, After-Tax			(14)	(12)
Other Income [Member] \| Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(2)	25
Reclassification for Available for Sale Securities, Tax	1	(12)
Reclassification for Available for Sale Securities, After-Tax	(1)	13
Other Income [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	(2)	24
Reclassification for Available for Sale Securities, Tax	1	(12)
Reclassification for Available for Sale Securities, After-Tax	$ (1)	$ 12
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			(6)	53
Reclassification for Available for Sale Securities, Tax			3	(25)
Reclassification for Available for Sale Securities, After-Tax			(3)	28
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			(6)	43
Reclassification for Available for Sale Securities, Tax			3	(22)
Reclassification for Available for Sale Securities, After-Tax			$ (3)	$ 21