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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Accumulated Other Comprehensive Loss | The changes in the cumulative balances of “Accumulated other comprehensive loss” reported in the Consolidated Balance Sheets consisted of the following:
| Balance at Beginning of Year |  | Net Income |  | Reclassification Adjustments |  | Balance at End of Period
| ($ in millions)
Nine months ended September 30, 2025 |  |  |  |  |  |  |
Pensions and other postretirement liabilities | $ | (240) |  |  | $ | — |  |  | $ | — |  |  | $ | (240) |
Other comprehensive loss of equity investees | (22) |  |  | — |  |  | — |  |  | (22) |
Accumulated other comprehensive loss | $ | (262) |  |  | $ | — |  |  | $ | — |  |  | $ | (262) |
Nine months ended September 30, 2024 |  |  |  |  |  |  |
Pensions and other postretirement liabilities | $ | (292) |  |  | $ | (7) |  |  | $ | (6) |  |  | $ | (305) |
Other comprehensive income (loss) of equity investees | (28) |  |  | 1 |  |  | — |  |  | (27) |
Accumulated other comprehensive loss | $ | (320) |  |  | $ | (6) |  |  | $ | (6) |  |  | $ | (332) |

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- Definition Tabular disclosure of the components of accumulated other comprehensive income (loss). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -Publisher FASB -URI https://asc.fasb.org/1943274/2147482790/220-10-45-14A Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-1 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 45 -Paragraph 20 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481694/830-30-45-20 + Details
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