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Equity and Comprehensive Income (Loss) (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Schedule of Components in Accumulated Other Comprehensive Income | The changes in the balances of Accumulated other comprehensive income (loss) by component are as follows:
(dollars in millions) | Foreign currency translation adjustments |  | Unrealized gain (loss) on cash flow hedges |  | Unrealized gain (loss) on fair value hedges |  | Unrealized gain (loss) on marketable securities |  | Defined benefit pension and postretirement plans |  | Total
Balance at January 1, 2021 | $ | (404) |  |  | $ | (1,387) |  |  | $ | — |  |  | $ | 25 |  |  | $ | 1,695 |  |  | $ | (71) |
Other comprehensive loss | (141) |  |  | (1,318) |  |  | — |  |  | (8) |  |  | — |  |  | (1,467) |
Amounts reclassified to net income | — |  |  | 1,233 |  |  | — |  |  | (1) |  |  | (621) |  |  | 611 |
Net other comprehensive income (loss) | (141) |  |  | (85) |  |  | — |  |  | (9) |  |  | (621) |  |  | (856) |
Balance at December 31, 2021 | (545) |  |  | (1,472) |  |  | — |  |  | 16 |  |  | 1,074 |  |  | (927) |
Excluded components recognized in other comprehensive income | — |  |  | — |  |  | (371) |  |  | — |  |  | — |  |  | (371) |
Other comprehensive loss | (153) |  |  | (174) |  |  | — |  |  | (25) |  |  | (317) |  |  | (669) |
Amounts reclassified to net income | — |  |  | 496 |  |  | (60) |  |  | — |  |  | (334) |  |  | 102 |
Net other comprehensive income (loss) | (153) |  |  | 322 |  |  | (431) |  |  | (25) |  |  | (651) |  |  | (938) |
Balance at December 31, 2022 | (698) |  |  | (1,150) |  |  | (431) |  |  | (9) |  |  | 423 |  |  | (1,865) |
Excluded components recognized in other comprehensive income | — |  |  | — |  |  | 617 |  |  | — |  |  | — |  |  | 617 |
Other comprehensive income | 62 |  |  | 3 |  |  | — |  |  | 5 |  |  | — |  |  | 70 |
Amounts reclassified to net income | — |  |  | 85 |  |  | (81) |  |  | 2 |  |  | (208) |  |  | (202) |
Net other comprehensive income (loss) | 62 |  |  | 88 |  |  | 536 |  |  | 7 |  |  | (208) |  |  | 485 |
Balance at December 31, 2023 | $ | (636) |  |  | $ | (1,062) |  |  | $ | 105 |  |  | $ | (2) |  |  | $ | 215 |  |  | $ | (1,380) |

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