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Accumulated Other Comprehensive Loss (Tables) | 6 Months Ended
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Jun. 30, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Summary 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 six months ended June 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) |
Other comprehensive income (loss) before reclassifications | — |  |  | — |  |  | (5) |  |  | (5) |
Amounts reclassified from accumulated other comprehensive loss | 38 |  |  | (9) |  |  | — |  |  | 29 |
Net current-period other comprehensive income (loss) | 38 |  |  | (9) |  |  | (5) |  |  | 24 |
Balance at June 30, 2024 | $ | (1,007) |  |  | 267 |  |  | (46) |  |  | (786) |
The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the six months ended June 30, 2023:
| Pension Plans |  | Post-Retirement Benefit Plans |  | Foreign Currency Translation Adjustment and Other |  | Total
| (Dollars in millions)
Balance at December 31, 2022 | $ | (985) |  |  | 308 |  |  | (422) |  |  | (1,099) |
Other comprehensive income before reclassifications | — |  |  | — |  |  | 20 |  |  | 20 |
Amounts reclassified from accumulated other comprehensive loss | 36 |  |  | (10) |  |  | — |  |  | 26 |
Net current-period other comprehensive income (loss) | 36 |  |  | (10) |  |  | 20 |  |  | 46 |
Balance at June 30, 2023 | $ | (949) |  |  | 298 |  |  | (402) |  |  | (1,053) |
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 six months ended June 30, 2024:
Three Months Ended June 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 |  | $ | 21 |  |  | Other income (expense), net
Prior service credit |  | (3) |  |  | Other income (expense), net
Total before tax |  | 18 |  |  |
Income tax benefit |  | (4) |  |  | Income tax expense
Net of tax |  | $ | 14 |  |  |
Six Months Ended June 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 |  | $ | 45 |  |  | Other income (expense), net
Prior service credit |  | (7) |  |  | Other income (expense), net
Total before tax |  | 38 |  |  |
Income tax benefit |  | (9) |  |  | Income tax expense
Net of tax |  | $ | 29 |  |  |
________________________________________________________________________ (1)See Note 7—Employee Benefits for additional information on our net periodic benefit expense (income) 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 six months ended June 30, 2023:
Three Months Ended June 30, 2023 |  | 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 |  | $ | 21 |  |  | Other income (expense), net
Prior service credit |  | (3) |  |  | Other income (expense), net
Total before tax |  | 18 |  |  |
Income tax benefit |  | (4) |  |  | Income tax expense
Net of tax |  | $ | 14 |  |  |
Six Months Ended June 30, 2023 |  | 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 |  | $ | 41 |  |  | Other income (expense), net
Prior service credit |  | (7) |  |  | Other income (expense), net
Total before tax |  | 34 |  |  |
Income tax benefit |  | (8) |  |  | Income tax expense
Net of tax |  | $ | 26 |  |  |
________________________________________________________________________ (1)See Note 7—Employee Benefits for additional information on our net periodic benefit income related to our pension and post-retirement plans.

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