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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period |  |  |  | $ 13,239 |
Other Comprehensive Income (Loss), Tax |  | $ 0 | $ (3) | (3) | $ (8)
Interest Rate Derivatives, Tax |  | 43 | 72 | 24 | 121
Accumulated other comprehensive income (loss) at end of period |  | 13,777 |  | 13,777 |
Gains and Losses on Cash Flow Hedges |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period |  | (87) | (75) | (80) | (60)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | (9) | (10) | (25)
Losses reclassified from net accumulated other comprehensive loss | [1] | 0 | 0 | 0 | 0
Net current period other comprehensive income (loss) |  | 1 | (8) | (6) | (23)
Accumulated other comprehensive income (loss) at end of period |  | (86) | (83) | (86) | (83)
Gains and Losses on Cash Flow Hedges | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  | 0 | (3) | (3) | (9)
Interest Rate Derivatives, Tax |  | 0 | 0 | 1 | 1
Amortization of Net Actuarial Loss, Tax |  | 0 | 0 | 0 | 0
Gains and Losses on Cash Flow Hedges | Interest Rate Swap |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Losses reclassified from net accumulated other comprehensive loss | [2] | 1 | 1 | 4 | 2
Defined Benefit Pension and Postretirement Items |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period |  | (58) | (60) | (61) | (64)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | 0 | 0 | 2
Losses reclassified from net accumulated other comprehensive loss | [1] | 1 | 1 | 4 | 3
Net current period other comprehensive income (loss) |  | 1 | 1 | 4 | 5
Accumulated other comprehensive income (loss) at end of period |  | (57) | (59) | (57) | (59)
Defined Benefit Pension and Postretirement Items | Reclassification out of Accumulated Other Comprehensive Income |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Other Comprehensive Income (Loss), Tax |  | 0 | 0 | 0 | 1
Interest Rate Derivatives, Tax |  | 0 | 0 | 0 | 0
Amortization of Net Actuarial Loss, Tax |  | 0 | 0 | (1) | (1)
Defined Benefit Pension and Postretirement Items | Interest Rate Swap |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Losses reclassified from net accumulated other comprehensive loss | [2] | 0 | 0 | 0 | 0
Total |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Accumulated other comprehensive income (loss) at beginning of period |  | (145) | (135) | (141) | (124)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  | 0 | (9) | (10) | (23)
Losses reclassified from net accumulated other comprehensive loss | [1] | 1 | 1 | 4 | 3
Net current period other comprehensive income (loss) |  | 2 | (7) | (2) | (18)
Accumulated other comprehensive income (loss) at end of period |  | (143) | (142) | (143) | (142)
Total | Interest Rate Swap |  |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |  |
Losses reclassified from net accumulated other comprehensive loss | [2] | $ 1 | $ 1 | $ 4 | $ 2
[1] | Included in the computation of net periodic pension and postretirement benefit costs.
[2] | Included in interest charges.

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