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Other Comprehensive Income (Loss) (Tables) | 6 Months Ended
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Jun. 30, 2023
Equity [Abstract] |
Schedule of Changes in AOCI balance by Component |
| Pension and Other Post-Employment Benefits | Interest Rate Derivatives | Other | Accumulated Other Comprehensive Income (Loss)
(Dollars in millions) |  |  |  |
Balance December 31, 2022, Net of Tax | $ | (497) |  | $ | 150 |  | $ | (41) |  | $ | (388) |
Other Comprehensive Income (Loss) |  |  |  |
Income Before Reclassifications | — |  | 3 |  | — |  | 3 |
Amounts Reclassified to Net Earnings | 10 |  | — |  | — |  | 10 |
Tax Expense | (2) |  | (13) |  | — |  | (15) |
Total Other Comprehensive Income | 8 |  | (10) |  | — |  | (2) |
Balance June 30, 2023, Net of Tax | $ | (489) |  | $ | 140 |  | $ | (41) |  | $ | (390) |

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