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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		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 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)	$ 10	$ (39)	$ 43
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	3	(7)	12	(24)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(9)	3	(27)	19
Cash Flow Hedges [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	0	1	0	1	$ 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)	(31)	(30)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	3	4	9	12
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(7)	(6)	(22)	(18)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(7)	(6)	(22)	(18)
Available-for-Sale Securities [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification for Available for Sale Securities, Pre-Tax	(2)	18	(8)	71
Reclassification for Available for Sale Securities, Tax	0	(10)	3	(35)
Reclassification for Available for Sale Securities, After-Tax	(2)	8	(5)	36
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(2)	8	(5)	36
Power [Member]
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(11)	10	(34)	36
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax	3	(6)	11	(21)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(8)	4	(23)	15
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	(10)	(9)	(27)	(26)
Reclassification Adjustment from AOCI, Pension and OPEB, Tax	3	4	8	11
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax	(7)	(5)	(19)	(15)
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(7)	(5)	(19)	(15)
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)	19	(7)	62
Reclassification for Available for Sale Securities, Tax	0	(10)	3	(32)
Reclassification for Available for Sale Securities, After-Tax	(1)	9	(4)	30
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss)	(1)	9	(4)	30
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	3
Amortization of Prior Service (Cost) Credit, Tax	0	(1)
Amortization of Prior Service (Cost) Credit, After-Tax	1	2
Amortization of Actuarial Loss, Pre-Tax	(11)	(13)
Amortization of Actuarial Loss, Tax	3	5
Amortization of Actuarial Loss, After-Tax	(8)	(8)
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	(11)	(11)
Amortization of Actuarial Loss, Tax	3	5
Amortization of Actuarial Loss, After-Tax	(8)	(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			3	7
Amortization of Prior Service (Cost) Credit, Tax			0	(3)
Amortization of Prior Service (Cost) Credit, After-Tax			3	4
Amortization of Actuarial Loss, Pre-Tax			(34)	(37)
Amortization of Actuarial Loss, Tax			9	15
Amortization of Actuarial Loss, After-Tax			(25)	(22)
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			3	6
Amortization of Prior Service (Cost) Credit, Tax			0	(3)
Amortization of Prior Service (Cost) Credit, After-Tax			3	3
Amortization of Actuarial Loss, Pre-Tax			(30)	(32)
Amortization of Actuarial Loss, Tax			8	14
Amortization of Actuarial Loss, After-Tax			(22)	(18)
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)	18
Reclassification for Available for Sale Securities, Tax	0	(10)
Reclassification for Available for Sale Securities, After-Tax	(2)	8
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	(1)	19
Reclassification for Available for Sale Securities, Tax	0	(10)
Reclassification for Available for Sale Securities, After-Tax	$ (1)	$ 9
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			(8)	71
Reclassification for Available for Sale Securities, Tax			3	(35)
Reclassification for Available for Sale Securities, After-Tax			(5)	36
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			(7)	62
Reclassification for Available for Sale Securities, Tax			3	(32)
Reclassification for Available for Sale Securities, After-Tax			$ (4)	$ 30