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Accumulated Other Comprehensive Loss (Tables) | 9 Months Ended
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Sep. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of the Entity's Accumulated Other Comprehensive Loss by Component | The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheet by component for the nine months ended September 30, 2025:
| Pension Plans |  | Post-Retirement Benefit Plans |  | Foreign Currency Translation Adjustment and Other |  | Total
| (Dollars in millions)
Balance at December 31, 2024 | $ | (1,003) |  |  | 320 |  |  | (40) |  |  | (723) |
Other comprehensive income (loss) before reclassifications | — |  |  | — |  |  | 14 |  |  | 14 |
Amounts reclassified from accumulated other comprehensive loss | 81 |  |  | (19) |  |  | — |  |  | 62 |
Net current-period other comprehensive income (loss) | 81 |  |  | (19) |  |  | 14 |  |  | 76 |
Balance at September 30, 2025 | $ | (922) |  |  | 301 |  |  | (26) |  |  | (647) |
The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the nine months ended September 30, 2024:
| Pension Plans |  | Post-Retirement Benefit Plans |  | Foreign Currency Translation Adjustment and Other |  | Total
| (Dollars in millions)
Balance at December 31, 2023 | $ | (1,045) |  |  | 276 |  |  | (41) |  |  | (810) |
Amounts reclassified from accumulated other comprehensive loss | 57 |  |  | (13) |  |  | — |  |  | 44 |
Net current-period other comprehensive income (loss) | 57 |  |  | (13) |  |  | — |  |  | 44 |
Balance at September 30, 2024 | $ | (988) |  |  | 263 |  |  | (41) |  |  | (766) |
Schedule of Reclassifications Out of Accumulated Other Comprehensive Loss by Component | The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and nine months ended September 30, 2025:
Three Months Ended September 30, 2025 |  | Decrease (Increase) in Net Income |  | Affected Line Item in Consolidated Statement of Operations
|  | (Dollars in millions) |  |
Amortization of pension & post-retirement plans(1) |  |  |  |
Net actuarial loss |  | $ | 30 |  |  | Other income, net
Prior service credit |  | (3) |  |  | Other income, net
Total before tax |  | 27 |  |  |
Income tax benefit |  | (6) |  |  | Income tax (benefit) expense
Net of tax |  | $ | 21 |  |  |
Nine Months Ended September 30, 2025 |  | Decrease (Increase) in Net Income |  | Affected Line Item in Consolidated Statement of Operations
|  | (Dollars in millions) |  |
Amortization of pension & post-retirement plans(1) |  |  |  |
Net actuarial loss |  | $ | 89 |  |  | Other income, net
Prior service credit |  | (7) |  |  | Other income, net
Total before tax |  | 82 |  |  |
Income tax benefit |  | (20) |  |  | Income tax (benefit) expense
Net of tax |  | $ | 62 |  |  |
________________________________________________________________________ (1)See Note 8—Employee Benefits for additional information on our net periodic benefit expense related to our pension and post-retirement plans. The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three and nine months ended September 30, 2024:
Three Months Ended September 30, 2024 |  | Decrease (Increase) in Net Income |  | Affected Line Item in Consolidated Statement of Operations
|  | (Dollars in millions) |  |
Amortization of pension & post-retirement plans(1) |  |  |  |
Net actuarial loss |  | $ | 24 |  |  | Other income, net
Prior service credit |  | (4) |  |  | Other income, net
Total before tax |  | 20 |  |  |
Income tax benefit |  | (5) |  |  | Income tax (benefit) expense
Net of tax |  | $ | 15 |  |  |
Nine Months Ended September 30, 2024 |  | Decrease (Increase) in Net Income |  | Affected Line Item in Consolidated Statement of Operations
|  | (Dollars in millions) |  |
Amortization of pension & post-retirement plans(1) |  |  |  |
Net actuarial loss |  | $ | 69 |  |  | Other income, net
Prior service credit |  | (11) |  |  | Other income, net
Total before tax |  | 58 |  |  |
Income tax benefit |  | (14) |  |  | Income tax (benefit) expense
Net of tax |  | $ | 44 |  |  |
________________________________________________________________________ (1)See Note 8—Employee Benefits for additional information on our net periodic benefit expense related to our pension and post-retirement plans.

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