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Accumulated Other Comprehensive Income (Loss), Net of Tax | 3 Months Ended
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Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income (Loss), Net of Tax | Accumulated Other Comprehensive Income (Loss), Net of Tax
|  |  | 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) |  |
|  |  |  |  |  |  |  |  |  | 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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477250/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478524/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/220/tableOfContent + Details
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