Accumulated Other Comprehensive Income (Loss), Net of Tax Accumulated Other Comprehensive Income (Loss), Net of Tax (Reclassifications out of AOCI) (Details) - USD ($) $ in Millions	12 Months Ended
Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax	$ (54)	$ 96	$ (62)
Amount Reclassified from Accumulated Other Comprehensive Income, Tax	17	(53)	27
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(37)	43	(35)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	(13)	134	(6)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	5	(69)	4
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	8	(65)	2
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(8)	65	(2)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax	(41)	(41)	(56)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax	12	17	23
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax	(29)	(24)	(33)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(29)	(24)	(33)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax	0	3
Amount Reclassified from AOCI for Cash Flow Hedges, Tax		(1)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax		2
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	0	2	0
Net Gains (Losses) on Trust Investments [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	(13)	134	(6)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	5	(69)	(4)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(8)	65	(2)
Interest Expense [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Cash Flow Hedges, Pre-Tax		3
Amount Reclassified from AOCI for Cash Flow Hedges, Tax		1
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax		2
Non-Operating Pension and OPEB Credits (Costs) [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	6	10	(12)
Amortization of Prior Service (Cost) Credit, Tax	(2)	(4)	(5)
Amortization of Prior Service (Cost) Credit, After-Tax	4	6	7
Amortization of Actuarial Loss, Pre-Tax	(47)	(51)	68
Amortization of Actuarial Loss, Tax	(14)	(21)	(28)
Amortization of Actuarial Loss, After-Tax	(33)	(30)	(40)
Power [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax	(46)	90	(54)
Amount Reclassified from Accumulated Other Comprehensive Income, Tax	15	(51)	22
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(31)	39	(32)
Power [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	(11)	125	(6)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	5	(65)	3
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	6	(60)	3
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(6)	60	(3)
Power [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax	(35)	(35)	(48)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax	10	14	19
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax	(25)	(21)	(29)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	(25)	(21)	(29)
Power [Member] \| Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax	0	0	0
Power [Member] \| Net Gains (Losses) on Trust Investments [Member] \| Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amount Reclassified from AOCI for Available for Sale Securities, Pre-Tax	(11)	125	(6)
Amount Reclassified from AOCI for Available for Sale Securities, Tax	5	(65)	(3)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax	(6)	60	(3)
Power [Member] \| Non-Operating Pension and OPEB Credits (Costs) [Member] \| Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Amortization of Prior Service (Cost) Credit, Pre-Tax	5	9	(11)
Amortization of Prior Service (Cost) Credit, Tax	(1)	(4)	(5)
Amortization of Prior Service (Cost) Credit, After-Tax	4	5	6
Amortization of Actuarial Loss, Pre-Tax	(40)	(44)	59
Amortization of Actuarial Loss, Tax	(11)	(18)	(24)
Amortization of Actuarial Loss, After-Tax	$ (29)	$ (26)	$ (35)

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