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Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2023
Equity [Abstract] |
Components of Accumulated Other Comprehensive Loss | The components of accumulated other comprehensive loss are as follows (dollars in millions):
|  | Unrealized Gains (Losses) on Available- for-Sale Securities |  |  | Foreign Currency Translation Adjustments |  |  | Defined Benefit Plans |  |  | Change in Fair Value of Derivative Instruments |  |  | Total |
Balances at December 31, 2020 |  | $ | 25 |  |  | $ | (271 | ) |  | $ | (220 | ) |  | $ | (36 | ) |  | $ | (502 | )
Unrealized losses on available-for-sale securities, net of $3 income tax benefit |  |  | (13 | ) |  |  |  |  |  |  |  |  |  |  |  | (13 | )
Foreign currency translation adjustments, net of $2 income tax benefit |  |  |  |  |  | (7 | ) |  |  |  |  |  |  |  |  | (7 | )
Defined benefit plans, net of $20 of income taxes |  |  |  |  |  |  |  |  | 67 |  |  |  |  |  |  | 67 |
Change in fair value of derivative instruments |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  | 1 |
Expense reclassified into operations from other comprehensive income, net of $7 and $8 income tax benefits, respectively |  |  |  |  |  |  |  |  | 21 |  |  |  | 29 |  |  |  | 50 |
Balances at December 31, 2021 |  |  | 12 |  |  |  | (278 | ) |  |  | (132 | ) |  |  | (6 | ) |  |  | (404 | )
Unrealized losses on available-for-sale securities, net of $12 income tax benefit |  |  | (43 | ) |  |  |  |  |  |  |  |  |  |  |  | (43 | )
Foreign currency translation adjustments, net of $16 income tax benefit |  |  |  |  |  | (95 | ) |  |  |  |  |  |  |  |  | (95 | )
Defined benefit plans, net of $11 of income taxes |  |  |  |  |  |  |  |  | 38 |  |  |  |  |  |  | 38 |
Change in fair value of derivative instruments, net of $1 of income taxes |  |  |  |  |  |  |  |  |  |  |  | 5 |  |  |  | 5 |
Expense reclassified into operations from other comprehensive income, net of none, $2 and $1 income tax benefits, respectively |  |  | 1 |  |  |  |  |  |  | 7 |  |  |  | 1 |  |  |  | 9 |
Balances at December 31, 2022 |  |  | (30 | ) |  |  | (373 | ) |  |  | (87 | ) |  |  | — |  |  |  | (490 | )
Unrealized gains on available-for-sale securities, net of $2 of income taxes |  |  | 9 |  |  |  |  |  |  |  |  |  |  |  |  | 9 |
Foreign currency translation adjustments, net of $7 of income taxes |  |  |  |  |  | 34 |  |  |  |  |  |  |  |  |  | 34 |
Defined benefit plans, net of $6 of income taxes |  |  |  |  |  |  |  |  | 21 |  |  |  |  |  |  | 21 |
Expense (benefit) reclassified into operations from other comprehensive income, net of no ne of income taxes and $1 income tax benefit, respectively |  |  | (1 | ) |  |  |  |  |  | 2 |  |  |  |  |  |  | 1 |
Balances at December 31, 2023 |  | $ | (22 | ) |  | $ | (339 | ) |  | $ | (64 | ) |  | $ | — |  |  | $ | (425 | )

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