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Accumulated Other Comprehensive Income (Loss), Net of Tax - Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Dec. 31, 2024
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ (4) | $ 0 | $ (6) | $ (4) |
Reclassification from Accumulated Other Comprehensive Income, Current Period, Tax | 1 | (1) | 1 | 1 |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (3) | (1) | (5) | (3) |
Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cash Flow Hedge, Pre-tax | 1 | 4 | 2 | 7 |
Cash Flow Hedge, Tax | 0 | (1) | (1) | (2) |
Cash Flow Hedge, After Tax | 1 | 3 | 1 | 5 |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax |  |  | 2 |  | $ 13
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | 1 | 3 | 1 | 5 | $ 9
Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification Adjustment from AOCI, Pension and OPEB, Pre-Tax | (2) | (2) | (4) | (5) |
Reclassification Adjustment from AOCI, Pension and OPEB, Tax | 0 | 0 | 1 | 1 |
Reclassification Adjustment from AOCI, Pension and OPEB, After-Tax | (2) | (2) | (3) | (4) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | (2) | (3) | (4) |
Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (3) | (2) | (4) | (6) |
Reclassification for Available for Sale Securities, Tax | 1 | 0 | 1 | 2 |
Reclassification for Available for Sale Securities, After-Tax | (2) | (2) | (3) | (4) |
Amounts Reclassified from Accumulated Other Comprehensive Income (Loss) | (2) | (2) | (3) | (4) |
Interest Expense [Member] | Cash Flow Hedges [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Cash Flow Hedge, Pre-tax | 1 | 4 | 2 | 7 |
Cash Flow Hedge, Tax | 0 | (1) | (1) | (2) |
Cash Flow Hedge, After Tax | 1 | 3 | 1 | 5 |
Non-Operating Pension and OPEB Credits (Costs) [Member] | Pension and OPEB Plans [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Amortization of Net Actuarial Loss, Pre-Tax | (2) | (2) | (4) | (5) |
Amortization of Net Actuarial Loss, Tax | 0 | 0 | 1 | 1 |
Amortization of Net Actuarial Loss, After-Tax | (2) | (2) | (3) | (4) |
Net Gains (Losses) on Trust Investments [Member] | Available-for-Sale Securities [Member] |  |  |  |  |
Reclassification out of Accumulated Other Comprehensive Income [Line Items] |  |  |  |  |
Reclassification for Available for Sale Securities, Pre-Tax | (3) | (2) | (4) | (6) |
Reclassification for Available for Sale Securities, Tax | 1 | 0 | 1 | 2 |
Reclassification for Available for Sale Securities, After-Tax | $ (2) | $ (2) | $ (3) | $ (4) |

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- Definition Amount, after tax, of reclassification of gain (loss) from accumulated other comprehensive income (AOCI) for derivative instrument designated and qualifying as cash flow hedge included in assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 11 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-11 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 15 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-15 + Details
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