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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2025
Equity [Abstract] |
Schedule of Changes in AOCI balance by Component |
| Pension and Other Post-Employment Benefits | Interest Rate Derivatives | Other | Accumulated Other Comprehensive (Loss) Income
(Dollars in Millions) |  |  |  |
Balance December 31, 2024, Net of Tax | $ | (349) |  | $ | 153 |  | $ | (36) |  | $ | (232) |
Other Comprehensive Income (Loss) |  |  |  |
Amounts Reclassified to Net Earnings | 12 |  | — |  | 4 |  | 16 |
Tax Expense | (3) |  | — |  | (1) |  | (4) |
Total Other Comprehensive Income | 9 |  | — |  | 3 |  | 12 |
Balance September 30, 2025, Net of Tax | $ | (340) |  | $ | 153 |  | $ | (33) |  | $ | (220) |

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