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Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2024
Comprehensive Income [Abstract] |
Accumulated Other Comprehensive Income, Net Of Tax |
| ($ in millions) |  | OPEB Costs
| Balance at December 31, 2021 (1) |  | $ | 60
| Other comprehensive income |  |  |
| before reclassifications |  |  | 30
| Amounts reclassified from accumulated other |  |  |
| comprehensive income to net income |  |  | (11)
| Net current-period other comprehensive |  |  |
| income |  |  | 19
| Balance at December 31, 2022 (1) |  | $ | 79
| Other comprehensive income |  |  |
| before reclassifications |  |  | 34
| Amounts reclassified from accumulated other |  |  |
| comprehensive income to net income |  |  | (17)
| Net current-period other comprehensive |  |  |
| income |  |  | 17
| Balance at December 31, 2023 (1) |  | $ | 96
| Other comprehensive income |  |  |
| before reclassifications |  |  | -
| Amounts reclassified from accumulated other |  |  |
| comprehensive income to net income |  |  | (19)
| Net current-period other comprehensive |  |  |
| income |  |  | (19)
| Balance at December 31, 2024 (1) |  | $ | 77
(1)OPEB amounts are net of deferred tax balances of $23 million, $29 million, $23 million, and $15 million, as of December 31, 2024, 2023, 2022, and 2021, respectively.
Reclassification Out Of AOCI |
|  |  | Amount Reclassified from Accumulated Other Comprehensive Loss (1) |  |  |
| Details about Accumulated Other |  | For the year ended |  | For the year ended |  | For the year ended |  | Affected line item in the |
| Comprehensive Loss Components |  | December 31, |  | December 31, |  | December 31, |  | statement where net |
| ($ in millions) |  | 2024 |  | 2023 |  | 2022 |  | income (loss) is presented |
| Amortization of OPEB Cost Items(2) |  |  |  |  |  |  |  |  |  |  |  |
| Prior-service credits (costs) |  | $ | 25 |  | $ | 22 |  | $ | 13 |  |  |
| Actuarial gains (losses) |  |  | - |  |  | - |  |  | - |  |  |
| Reclassifications, pretax |  |  | 25 |  |  | 22 |  |  | 13 |  | Income before income taxes |
| Tax impact |  |  | (6) |  |  | (5) |  |  | (2) |  | Income tax expense |
| Reclassifications, net of tax |  | $ | 19 |  | $ | 17 |  | $ | 11 |  | Net gain |
(1)Amounts in parentheses indicate losses. (2)These accumulated other comprehensive loss components are included in the computation of net periodic pension and OPEB costs (see Note 18 - Retirement Plans for additional details).

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