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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income by Component |
|  |  | Three Months Ended September 30, 2025 |  |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  |  | Pension and OPEB Plans |  |  | Available-for-Sale Securities |  |  | Total |  |
|  |  | Millions |  |
| Balance as of June 30, 2025 |  | $ | 23 |  |  | $ | (73 | ) |  | $ | (73 | ) |  | $ | (123 | ) |
| Other Comprehensive Income (Loss) before Reclassifications |  |  | — |  |  |  | — |  |  |  | 11 |  |  |  | 11 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | — |  |
| Net Current Period Other Comprehensive Income (Loss) |  |  | (1 | ) |  |  | 1 |  |  |  | 11 |  |  |  | 11 |  |
| Balance as of September 30, 2025 |  | $ | 22 |  |  | $ | (72 | ) |  | $ | (62 | ) |  | $ | (112 | ) |
|  |  | Three Months Ended September 30, 2024 |  |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  |  | Pension and OPEB Plans |  |  | Available-for-Sale Securities |  |  | Total |  |
|  |  | Millions |  |
| Balance as of June 30, 2024 |  | $ | 20 |  |  | $ | (98 | ) |  | $ | (95 | ) |  | $ | (173 | ) |
| Other Comprehensive Income (Loss) before Reclassifications |  |  | (5 | ) |  |  | — |  |  |  | 37 |  |  |  | 32 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (3 | ) |  |  | 2 |  |  |  | — |  |  |  | (1 | ) |
| Net Current Period Other Comprehensive Income (Loss) |  |  | (8 | ) |  |  | 2 |  |  |  | 37 |  |  |  | 31 |  |
| Balance as of September 30, 2024 |  | $ | 12 |  |  | $ | (96 | ) |  | $ | (58 | ) |  | $ | (142 | ) |
|  |  | Nine Months Ended September 30, 2025 |  |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  |  | Pension and OPEB Plans |  |  | Available-for-Sale Securities |  |  | Total |  |
|  |  | Millions |  |
| Balance as of December 31, 2024 |  | $ | 36 |  |  | $ | (76 | ) |  | $ | (93 | ) |  | $ | (133 | ) |
| Other Comprehensive Income (Loss) before Reclassifications |  |  | (12 | ) |  |  | — |  |  |  | 28 |  |  |  | 16 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (2 | ) |  |  | 4 |  |  |  | 3 |  |  |  | 5 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | $ | (14 | ) |  | $ | 4 |  |  | $ | 31 |  |  | $ | 21 |  |
| Balance as of September 30, 2025 |  | $ | 22 |  |  | $ | (72 | ) |  | $ | (62 | ) |  | $ | (112 | ) |
|  |  | Nine Months Ended September 30, 2024 |  |
| Accumulated Other Comprehensive Income (Loss) |  | Cash Flow Hedges |  |  | Pension and OPEB Plans |  |  | Available-for-Sale Securities |  |  | Total |  |
|  |  | Millions |  |
| Balance as of December 31, 2023 |  | $ | 3 |  |  | $ | (102 | ) |  | $ | (80 | ) |  | $ | (179 | ) |
| Other Comprehensive Income (Loss) before Reclassifications |  |  | 17 |  |  |  | — |  |  |  | 18 |  |  |  | 35 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  |  | (8 | ) |  |  | 6 |  |  |  | 4 |  |  |  | 2 |  |
| Net Current Period Other Comprehensive Income (Loss) |  |  | 9 |  |  |  | 6 |  |  |  | 22 |  |  |  | 37 |  |
| Balance as of September 30, 2024 |  | $ | 12 |  |  | $ | (96 | ) |  | $ | (58 | ) |  | $ | (142 | ) |
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income |
|  |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Statement of Operations |  |
|  |  |  |  | Three Months Ended |  |  | Nine Months Ended |  |
|  |  |  |  | September 30, 2025 |  |  | September 30, 2025 |  |
| 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 Derivatives |  | Interest Expense |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | 3 |  |  | $ | (1 | ) |  | $ | 2 |  |
| Total Cash Flow Hedges |  |  | 1 |  |  |  | — |  |  |  | 1 |  |  |  | 3 |  |  |  | (1 | ) |  |  | 2 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Net Actuarial Loss |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | (2 | ) |  |  | 1 |  |  |  | (1 | ) |  |  | (6 | ) |  |  | 2 |  |  |  | (4 | ) |
| Total Pension and OPEB Plans |  |  | (2 | ) |  |  | 1 |  |  |  | (1 | ) |  |  | (6 | ) |  |  | 2 |  |  |  | (4 | ) |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | (5 | ) |  |  | 2 |  |  |  | (3 | ) |
| Total Available-for-Sale Debt Securities |  |  | (1 | ) |  |  | 1 |  |  |  | — |  |  |  | (5 | ) |  |  | 2 |  |  |  | (3 | ) |
| Total |  | $ | (2 | ) |  | $ | 2 |  |  | $ | — |  |  | $ | (8 | ) |  | $ | 3 |  |  | $ | (5 | ) |
|  |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Statement of Operations |  |
|  |  |  |  | Three Months Ended |  |  | Nine Months Ended |  |
|  |  |  |  | September 30, 2024 |  |  | September 30, 2024 |  |
| 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 Derivatives |  | Interest Expense |  | $ | 4 |  |  | $ | (1 | ) |  | $ | 3 |  |  | $ | 11 |  |  | $ | (3 | ) |  | $ | 8 |  |
| Total Cash Flow Hedges |  |  | 4 |  |  |  | (1 | ) |  |  | 3 |  |  |  | 11 |  |  |  | (3 | ) |  |  | 8 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |  |  | (1 | ) |  |  | — |  |  |  | (1 | ) |
| Amortization of Net Actuarial Loss |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  | (2 | ) |  |  | 1 |  |  |  | (1 | ) |  |  | (7 | ) |  |  | 2 |  |  |  | (5 | ) |
| Total Pension and OPEB Plans |  |  | (3 | ) |  |  | 1 |  |  |  | (2 | ) |  |  | (8 | ) |  |  | 2 |  |  |  | (6 | ) |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (6 | ) |  |  | 2 |  |  |  | (4 | ) |
| Total Available-for-Sale Debt Securities |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (6 | ) |  |  | 2 |  |  |  | (4 | ) |
| Total |  | $ | 1 |  |  | $ | — |  |  | $ | 1 |  |  | $ | (3 | ) |  | $ | 1 |  |  | $ | (2 | ) |

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