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Accumulated Other Comprehensive Loss (Tables) | 3 Months Ended
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Mar. 31, 2021
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Summary of the Entity's Accumulated Other Comprehensive Income (Loss) by Component | 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, 2021:
| Pension Plans |  | Post-Retirement Benefit Plans |  | Foreign Currency Translation Adjustment and Other |  | Interest Rate Swap |  | Total
| (Dollars in millions)
Balance at December 31, 2020 | $ | (2,197) |  |  | (272) |  |  | (265) |  |  | (79) |  |  | (2,813) |
Other comprehensive loss before reclassifications | — |  |  | — |  |  | (86) |  |  | — |  |  | (86) |
Amounts reclassified from accumulated other comprehensive loss | 35 |  |  | 4 |  |  | — |  |  | 15 |  |  | 54 |
Net current-period other comprehensive income (loss) | 35 |  |  | 4 |  |  | (86) |  |  | 15 |  |  | (32) |
Balance at March 31, 2021 | $ | (2,162) |  |  | (268) |  |  | (351) |  |  | (64) |  |  | (2,845) |
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, 2020:
| Pension Plans |  | Post-Retirement Benefit Plans |  | Foreign Currency Translation Adjustment and Other |  | Interest Rate Swap |  | Total
| (Dollars in millions)
Balance at December 31, 2019 | $ | (2,229) |  |  | (184) |  |  | (228) |  |  | (39) |  |  | (2,680) |
Other comprehensive loss before reclassifications | — |  |  | — |  |  | (239) |  |  | (80) |  |  | (319) |
Amounts reclassified from accumulated other comprehensive loss | 36 |  |  | 3 |  |  | — |  |  | 5 |  |  | 44 |
Net current-period other comprehensive income (loss) | 36 |  |  | 3 |  |  | (239) |  |  | (75) |  |  | (275) |
Balance at March 31, 2020 | $ | (2,193) |  |  | (181) |  |  | (467) |  |  | (114) |  |  | (2,955) |
Schedule of Reclassifications Out of Accumulated Other Comprehensive Income (Loss) by Component | The amount of realized losses reclassified from AOCI to the statement of operations consists of the following (in millions):
Derivatives designated as hedging instruments |  | 2021 |  | 2020
Cash flow hedging contracts |  |  |  |
Three Months Ended March 31, |  | $ | 20 |  |  | 5 |
The tables below present further information about our reclassifications out of accumulated other comprehensive loss by component for the three months ended March 31, 2021:
Three Months Ended March 31, 2021 |  | Decrease (Increase) in Net Income |  | Affected Line Item in Consolidated Statement of Operations
|  | (Dollars in millions) |  |
Interest rate swaps |  | $ | 20 |  |  | Interest expense
Income tax benefit |  | (5) |  |  | Income tax expense
Net of tax |  | $ | 15 |  |  |
Amortization of pension & post-retirement plans(1) |  |  |  |
Net actuarial loss |  | $ | 50 |  |  | Other income (expense), net
Prior service cost |  | 2 |  |  | Other income (expense), net
Total before tax |  | 52 |  |  |
Income tax benefit |  | (13) |  |  | Income tax expense
Net of tax |  | $ | 39 |  |  |
(1)See Note 7—Employee Benefits for additional information on our net periodic benefit (income) 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 months ended March 31, 2020:
Three Months Ended March 31, 2020 |  | Decrease (Increase) in Net Income |  | Affected Line Item in Consolidated Statement of Operations
|  | (Dollars in millions) |  |
Interest rate swaps |  | $ | 5 |  |  | Interest expense
Income tax expense |  | — |  |  | Income tax expense
Net of tax |  | $ | 5 |  |  |
Amortization of pension & post-retirement plans(1) |  |  |  |
Net actuarial loss |  | $ | 50 |  |  | Other income (expense), net
Prior service cost |  | 1 |  |  | Other income (expense), net
Total before tax |  | 51 |  |  |
Income tax benefit |  | (12) |  |  | Income tax expense
Net of tax |  | $ | 39 |  |  |
(1)See Note 7—Employee Benefits for additional information on our net periodic benefit (expense) income related to our pension and post-retirement plans.

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