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Other Comprehensive Loss (Tables) | 12 Months Ended
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Dec. 31, 2021
Equity [Abstract] |
Components of Accumulated Other Comprehensive Loss | The components of accumulated other comprehensive loss are as follows (dollars in millions):
|  | Unrealized Gains on Available- for-Sale Securities |  |  | Foreign Currency Translation Adjustments |  |  | Defined Benefit Plans |  |  | Change in Fair Value of Derivative Instruments |  |  | Total |
Balances at December 31, 2018 |  | $ | 3 |  |  | $ | (283 | ) |  | $ | (148 | ) |  | $ | 47 |  |  | $ | (381 | )
Unrealized gains on available-for-sale securities, net of $4 of income taxes |  |  | 11 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11 |
Foreign currency translation adjustments, net of $5 of income taxes |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Defined benefit plans, net of $14 income tax benefit |  |  | — |  |  |  | — |  |  |  | (49 | ) |  |  | — |  |  |  | (49 | )
Change in fair value of derivative instruments, net of $13 income tax benefit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (37 | ) |  |  | (37 | )
Expense (income) reclassified into operations from other comprehensive income, net of $3 income tax benefit and $3 of income taxes, respectively |  |  | — |  |  |  | — |  |  |  | 10 |  |  |  | (14 | ) |  |  | (4 | )
Balances at December 31, 2019 |  |  | 14 |  |  |  | (283 | ) |  |  | (187 | ) |  |  | (4 | ) |  |  | (460 | )
Unrealized gains on available-for-sale securities, net of $3 of income taxes |  |  | 11 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 11 |
Foreign currency translation adjustments, net of $6 of income taxes |  |  | — |  |  |  | 12 |  |  |  | — |  |  |  | — |  |  |  | 12 |
Defined benefit plans, net of $16 income tax benefit |  |  | — |  |  |  | — |  |  |  | (55 | ) |  |  | — |  |  |  | (55 | )
Change in fair value of derivative instruments, net of $15 income tax benefit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (51 | ) |  |  | (51 | )
Expense reclassified into operations from other comprehensive income, net of $6 and $5 of income tax benefits, respectively |  |  | — |  |  |  | — |  |  |  | 22 |  |  |  | 19 |  |  |  | 41 |
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 | )

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