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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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