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Accumulated Other Comprehensive Loss | 3 Months Ended
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Mar. 31, 2024
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Loss | Accumulated Other Comprehensive Loss Information Relating to 2024 The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheet by component for the three months ended March 31, 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 | — |  |  | — |  |  | (4) |  |  | (4) |
Amounts reclassified from accumulated other comprehensive loss | 20 |  |  | (5) |  |  | — |  |  | 15 |
Net current-period other comprehensive income (loss) | 20 |  |  | (5) |  |  | (4) |  |  | 11 |
Balance at March 31, 2024 | $ | (1,025) |  |  | 271 |  |  | (45) |  |  | (799) |
The table below presents further information about our reclassifications out of accumulated other comprehensive loss by component for the three months ended March 31, 2024:
Three Months Ended March 31, 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 (expense), net
Prior service credit |  | (4) |  |  | Other income (expense), net
Total before tax |  | 20 |  |  |
Income tax benefit |  | (5) |  |  | Income tax expense
Net of tax |  | $ | 15 |  |  |
________________________________________________________________________ (1)See Note 7—Employee Benefits for additional information on our net periodic benefit expense (income) related to our pension and post-retirement plans. Information Relating to 2023 The table below summarizes changes in accumulated other comprehensive loss recorded on our consolidated balance sheets by component for the three months ended March 31, 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 (loss) before reclassifications | — |  |  | — |  |  | 18 |  |  | 18 |
Amounts reclassified from accumulated other comprehensive loss | 17 |  |  | (5) |  |  | — |  |  | 12 |
Net current-period other comprehensive income (loss) | 17 |  |  | (5) |  |  | 18 |  |  | 30 |
Balance at March 31, 2023 | $ | (968) |  |  | 303 |  |  | (404) |  |  | (1,069) |
The table below presents further information about our reclassifications out of accumulated other comprehensive loss by component for the three months ended March 31, 2023:
Three Months Ended March 31, 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 |  | $ | 20 |  |  | Other income (expense), net
Prior service cost |  | (4) |  |  | Other income (expense), net
Total before tax |  | 16 |  |  |
Income tax benefit |  | (4) |  |  | Income tax expense
Net of tax |  | $ | 12 |  |  |
________________________________________________________________________ (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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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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