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Accumulated Other Comprehensive Income (Loss), Net of Tax (Tables) | 3 Months Ended
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Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Changes in Accumulated Other Comprehensive Income by Component |
|  |  | Three Months Ended March 31, 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 |  | 20 |  |  | — |  |  | (12) |  |  | 8 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | (2) |  |  | 2 |  |  | 2 |  |  | 2 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | 18 |  |  | 2 |  |  | (10) |  |  | 10 |  |
| Balance as of March 31, 2024 |  | $ | 21 |  |  | $ | (100) |  |  | $ | (90) |  |  | $ | (169) |  |
|  |  | Three Months Ended March 31, 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 |  | (2) |  |  | — |  |  | 20 |  |  | 18 |  |
| Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) |  | 1 |  |  | 3 |  |  | 6 |  |  | 10 |  |
| Net Current Period Other Comprehensive Income (Loss) |  | (1) |  |  | 3 |  |  | 26 |  |  | 28 |  |
| Balance as of March 31, 2023 |  | $ | (4) |  |  | $ | (423) |  |  | $ | (95) |  |  | $ | (522) |  |
Reclassifications out of Accumulated Other Comprehensive Income |
|  |  |  |  |  |  |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Statement of Operations |
|  |  |  |  |  | Three Months Ended |
|  |  |  |  |  | March 31, 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 |
|  |  |  |  |  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Derivatives |  | Interest Expense |  |  |  |  |  |  | $ | 3 |  |  | $ | (1) |  |  | $ | 2 |  |
| Total Cash Flow Hedges |  |  |  |  |  |  | 3 |  |  | (1) |  |  | 2 |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Net Actuarial Loss |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | (3) |  |  | 1 |  |  | (2) |  |
| Total Pension and OPEB Plans |  |  |  |  |  |  | (3) |  |  | 1 |  |  | (2) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  |  |  |  |  | (4) |  |  | 2 |  |  | (2) |  |
| Total Available-for-Sale Debt Securities |  |  |  |  |  |  | (4) |  |  | 2 |  |  | (2) |  |
| Total |  |  |  |  |  |  |  |  | $ | (4) |  |  | $ | 2 |  |  | $ | (2) |  |
|  |  |  |  |  |  |  |  |  | Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) to Statement of Operations |
|  |  |  |  |  | Three Months Ended |
|  |  |  |  |  | March 31, 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 |
|  |  |  |  |  |  |  |  | Millions |
| Cash Flow Hedges |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Interest Rate Derivatives |  | Interest Expense |  |  |  |  |  |  | $ | (1) |  |  | $ | — |  |  | $ | (1) |  |
| Total Cash Flow Hedges |  |  |  |  |  |  | (1) |  |  | — |  |  | (1) |  |
| Pension and OPEB Plans |  |  |  |  |  |  |  |  |  |  |  |
| Amortization of Prior Service (Cost) Credit |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | 2 |  |  | — |  |  | 2 |  |
| Amortization of Net Actuarial Loss |  | Net Non-Operating Pension and OPEB Credits (Costs) |  |  |  |  |  |  | (7) |  |  | 2 |  |  | (5) |  |
| Total Pension and OPEB Plans |  |  |  |  |  |  | (5) |  |  | 2 |  |  | (3) |  |
| Available-for-Sale Debt Securities |  |  |  |  |  |  |  |  |  |  |  |
| Realized Gains (Losses) |  | Net Gains (Losses) on Trust Investments |  |  |  |  |  |  | (10) |  |  | 4 |  |  | (6) |  |
| Total Available-for-Sale Debt Securities |  |  |  |  |  |  | (10) |  |  | 4 |  |  | (6) |  |
| Total |  |  |  |  |  |  |  |  | $ | (16) |  |  | $ | 6 |  |  | $ | (10) |  |

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