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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, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax | $ (28) | $ 108 | $ 23
Amount Reclassified from Accumulated Other Comprehensive Income, Tax | 10 | (55) | (17)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (18) | 53 | 6
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 | 8 | 135 | 75
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (6) | (66) | (39)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | (2) | (69) | (36)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 2 | 69 | 36
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from AOCI for Pension and OPEB Plans, Pre-Tax | (56) | (18) | (64)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax | 24 | 7 | 27
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax | (32) | (11) | (37)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (32) | (11) | (37)
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 | (9) | 12
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | (8) | 4 | (5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | 12 | (5) | 7
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 12 | (5) | 7
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 | (9) | 13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | (8) | 4 | (5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | 12 | (5) | 8
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 | 12 | 10 | 11
Amortization of Prior Service (Cost) Credit, Tax | (3) | (4) | (4)
Amortization of Prior Service (Cost) Credit, After-Tax | 9 | 6 | 7
Amortization of Actuarial Loss, Pre-Tax | (68) | (28) | (75)
Amortization of Actuarial Loss, Tax | (27) | (11) | (31)
Amortization of Actuarial Loss, After-Tax | (41) | (17) | (44)
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 | 100 | 181 | 116
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (52) | (89) | (59)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 48 | 92 | 57
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 |  |  | (1)
Amount Reclassified from AOCI for Cash Flow Hedges, Tax |  |  | 0
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax |  |  | (1)
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 | (39) | (26) | (29)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | 20 | 13 | 14
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | (19) | (13) | (15)
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 | (53) | (20) | (12)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | 26 | 10 | 6
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 27 | 10 | 6
Power [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Amount Reclassified from Accumulated Other Comprehensive Income, Pre-Tax | (22) | 109 | 32
Amount Reclassified from Accumulated Other Comprehensive Income, Tax | 7 | (54) | (21)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (15) | 55 | 11
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 | 7 | 134 | 74
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (6) | (65) | (38)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | (1) | (69) | (36)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 1 | 69 | 36
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 | (49) | (16) | (55)
Amount Reclassified from AOCI for Pension and OPEB Plans, Tax | 21 | 7 | 22
Amount Reclassified from AOCI for Pension and OPEB Plans, After-Tax | (28) | (9) | (33)
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | (28) | (9) | (33)
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 | (9) | 13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | (8) | 4 | (5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | 12 | (5) | 8
Amount Reclassified from Accumulated Other Comprehensive Income, After-Tax | 12 | (5) | 8
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 | (9) | 13
Amount Reclassified from AOCI for Cash Flow Hedges, Tax | (8) | 4 | (5)
Amount Reclassified from AOCI for Cash Flow Hedges, After-Tax | 12 | (5) | 8
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 | 11 | 9 | 9
Amortization of Prior Service (Cost) Credit, Tax | (3) | (4) | (4)
Amortization of Prior Service (Cost) Credit, After-Tax | 8 | 5 | 5
Amortization of Actuarial Loss, Pre-Tax | (60) | (25) | (64)
Amortization of Actuarial Loss, Tax | (24) | (11) | (26)
Amortization of Actuarial Loss, After-Tax | (36) | (14) | (38)
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 | 98 | 178 | 112
Amount Reclassified from AOCI for Available for Sale Securities, Tax | (51) | (87) | (57)
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | 47 | 91 | 55
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 | (38) | (24) | (26)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | 19 | 12 | 13
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | (19) | (12) | (13)
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 | (53) | (20) | (12)
Amount Reclassified from AOCI for Available for Sale Securities, Tax | 26 | 10 | 6
Amount Reclassified from AOCI for Available for Sale Securities, After-Tax | $ 27 | $ 10 | $ 6

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