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Comprehensive Income | 12 Months Ended
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Dec. 31, 2024
Comprehensive Income [Abstract] |
Comprehensive Income | ‎ (16) Comprehensive Income: Comprehensive income consists of net income and other gains and losses affecting shareholders’ equity and pension/postretirement benefit (OPEB) liabilities that, under GAAP, are excluded from net income (loss). The components of accumulated other comprehensive income, net of tax, are as follows:
| ($ 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 $15 million, as of December 31, 2024, 2023, 2022, and 2021, respectively. The significant items reclassified from each component of accumulated other comprehensive loss are as follows:
|  |  | Amount Reclassified from Accumulated Other Comprehensive Loss (1) |  |  |
| Details about Accumulated Other |  | For the year ended |  | For the year ended |  | For the year ended |  | Affected line item in the |
| Comprehensive Loss Components |  | December 31, |  | December 31, |  | December 31, |  | statement where net |
| ($ 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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- 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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