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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 9 Months Ended
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Sep. 30, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income by Component |
|  |  | Three Months Ended September 30, 2023 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of June 30, 2023 |  | $ | 7 |  |  | $ | (419) |  |  | $ | (103) |  |  | $ | (515) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | 13 |  |  | 82 |  |  | (36) |  |  | 59 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (2) |  |  | 240 |  |  | 5 |  |  | 243 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 11 |  |  | 322 |  |  | (31) |  |  | 302 |  |
| Balance as of September 30, 2023 |  | $ | 18 |  |  | $ | (97) |  |  | $ | (134) |  |  | $ | (213) |  |
|  |  | Three Months Ended September 30, 2022 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of June 30, 2022 |  | $ | (5) |  |  | $ | (354) |  |  | $ | (96) |  |  | $ | (455) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | (48) |  |  | (48) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 1 |  |  | — |  |  | 9 |  |  | 10 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 1 |  |  | — |  |  | (39) |  |  | (38) |  |
| Balance as of September 30, 2022 |  | $ | (4) |  |  | $ | (354) |  |  | $ | (135) |  |  | $ | (493) |  |
|  |  | Nine Months Ended September 30, 2023 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2022 |  | $ | (3) |  |  | $ | (426) |  |  | $ | (121) |  |  | $ | (550) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | 23 |  |  | 82 |  |  | (28) |  |  | 77 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (2) |  |  | 247 |  |  | 15 |  |  | 260 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 21 |  |  | 329 |  |  | (13) |  |  | 337 |  |
| Balance as of September 30, 2023 |  | $ | 18 |  |  | $ | (97) |  |  | $ | (134) |  |  | $ | (213) |  |
|  |  | Nine Months Ended September 30, 2022 |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  | Pension and OPEB Plans |  | Available-for-Sale Securities |  | Total |
|  |  | Millions |
| Balance as of December 31, 2021 |  | $ | (6) |  |  | $ | (355) |  |  | $ | 11 |  |  | $ | (350) |  |
| Other Comprehensive Income (Loss) before Reclassifications |  | — |  |  | — |  |  | (166) |  |  | (166) |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 2 |  |  | 1 |  |  | 20 |  |  | 23 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 2 |  |  | 1 |  |  | (146) |  |  | (143) |  |
| Balance as of September 30, 2022 |  | $ | (4) |  |  | $ | (354) |  |  | $ | (135) |  |  | $ | (493) |  |
Reclassifications out of Accumulated Other Comprehensive Income |
|  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  | Three Months Ended |  | Nine Months Ended |
|  |  |  | September 30, 2023 |  | September 30, 2023 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense | $ | 3 |  |  | $ | (1) |  |  | $ | 2 |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | 2 |  |
| Total Cash Flow Hedges | 3 |  |  | (1) |  |  | 2 |  |  | 3 |  |  | (1) |  |  | 2 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) | 2 |  |  | (1) |  |  | 1 |  |  | 6 |  |  | (2) |  |  | 4 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (3) |  |  | 1 |  |  | (2) |  |  | (17) |  |  | 5 |  |  | (12) |  |
| Pension Settlement Charge |  | Non-Operating Pension and OPEB Credits (Costs) | (332) |  |  | 93 |  |  | (239) |  |  | (332) |  |  | 93 |  |  | (239) |  |
| Total Pension and OPEB Plans | (333) |  |  | 93 |  |  | (240) |  |  | (343) |  |  | 96 |  |  | (247) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments | (8) |  |  | 3 |  |  | (5) |  |  | (25) |  |  | 10 |  |  | (15) |  |
| Total Available-for-Sale Debt Securities | (8) |  |  | 3 |  |  | (5) |  |  | (25) |  |  | 10 |  |  | (15) |  |
| Total |  |  | $ | (338) |  |  | $ | 95 |  |  | $ | (243) |  |  | $ | (365) |  |  | $ | 105 |  |  | $ | (260) |  |
|  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Income Statement |
|  |  |  | Three Months Ended |  | Nine Months Ended |
|  |  |  | September 30, 2022 |  | September 30, 2022 |
| Description of Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | Location of Pre-Tax Amount In Statement of Operations | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |  | Pre-Tax Amount |  | Tax (Expense) Benefit |  | After-Tax Amount |
|  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Swaps |  | Interest Expense | $ | (1) |  |  | $ | — |  |  | $ | (1) |  |  | $ | (3) |  |  | $ | 1 |  |  | $ | (2) |  |
| Total Cash Flow Hedges | (1) |  |  | — |  |  | (1) |  |  | (3) |  |  | 1 |  |  | (2) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Non-Operating Pension and OPEB Credits (Costs) | 5 |  |  | (1) |  |  | 4 |  |  | 15 |  |  | (4) |  |  | 11 |  |
| Amortization of Actuarial Loss |  | Non-Operating Pension and OPEB Credits (Costs) | (5) |  |  | 1 |  |  | (4) |  |  | (16) |  |  | 4 |  |  | (12) |  |
| Total Pension and OPEB Plans | — |  |  | — |  |  | — |  |  | (1) |  |  | — |  |  | (1) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments | (14) |  |  | 5 |  |  | (9) |  |  | (32) |  |  | 12 |  |  | (20) |  |
| Total Available-for-Sale Debt Securities | (14) |  |  | 5 |  |  | (9) |  |  | (32) |  |  | 12 |  |  | (20) |  |
| Total |  |  | $ | (15) |  |  | $ | 5 |  |  | $ | (10) |  |  | $ | (36) |  |  | $ | 13 |  |  | $ | (23) |  |

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