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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax | $ 96 | $ (62) | $ (28)
Amount Reclassified from Accumulated Other Comprehensive Income, Tax | (53) | 27 | 10
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 43 | (35) | (18)
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 | 134 | (6) | 8
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (69) | 4 | (6)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | (65) | 2 | (2)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 65 | (2) | 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) | (56) | (56)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax | 17 | 23 | 24
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax | (24) | (33) | (32)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (24) | (33) | (32)
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 | 0 | 20
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | (1) |  | (8)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | 2 |  | 12
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 2 | 0 | 12
Operating Revenues [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 |  |  | 20
Amount Reclassified from AOCI for Cash Flow Hedges, Tax |  |  | 8
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax |  |  | 12
Operation and Maintenance Expense [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 10 | 12 | (12)
Amortization of Prior Service (Cost) Credit, Tax | (4) | (5) | (3)
Amortization of Prior Service (Cost) Credit, After-Tax | 6 | 7 | 9
Amortization of Actuarial Loss, Pre-Tax | (51) | (68) | 68
Amortization of Actuarial Loss, Tax | (21) | (28) | (27)
Amortization of Actuarial Loss, After-Tax | (30) | (40) | (41)
Other Income [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 | 174 | 59 | 100
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (89) | (29) | 52
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 85 | 30 | 48
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 |  |
Other Deductions [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 | (28) | (37) | (39)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | 14 | 19 | (20)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | (14) | (18) | (19)
Other-Than-Temporary Impairments [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 | (12) | (28) | (53)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | 6 | 14 | (26)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 6 | 14 | 27
Power [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax | 90 | (54) | (22)
Amount Reclassified from Accumulated Other Comprehensive Income, Tax | (51) | 22 | 7
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 39 | (32) | (15)
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 | 125 | (6) | 7
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (65) | 3 | (6)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | (60) | 3 | (1)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 60 | (3) | 1
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) | (48) | (49)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax | 14 | 19 | 21
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax | (21) | (29) | (28)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (21) | (29) | (28)
Power [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 |  |  | 20
Amount Reclassified from AOCI for Cash Flow Hedges, Tax |  |  | (8)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax |  |  | 12
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 0 | 0 | 12
Power [Member] | Operating Revenues [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 |  |  | 20
Amount Reclassified from AOCI for Cash Flow Hedges, Tax |  |  | 8
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax |  |  | 12
Power [Member] | Operation and Maintenance Expense [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amortization of Prior Service (Cost) Credit, Pre-Tax | 9 | 11 | (11)
Amortization of Prior Service (Cost) Credit, Tax | (4) | (5) | (3)
Amortization of Prior Service (Cost) Credit, After-Tax | 5 | 6 | 8
Amortization of Actuarial Loss, Pre-Tax | (44) | (59) | 60
Amortization of Actuarial Loss, Tax | (18) | (24) | (24)
Amortization of Actuarial Loss, After-Tax | (26) | (35) | (36)
Power [Member] | Other Income [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 | 161 | 55 | 98
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (83) | (28) | 51
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 78 | 27 | 47
Power [Member] | Other Deductions [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 | (24) | (33) | (38)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | 12 | 17 | (19)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | (12) | (16) | (19)
Power [Member] | Other-Than-Temporary Impairments [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 | (12) | (28) | (53)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | 6 | 14 | (26)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | $ 6 | $ 14 | $ 27

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