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Other Comprehensive Loss - Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity [Abstract] |  |  |
Unrealized gains (losses) on available-for-sale securities, tax benefit |  |  | $ 2
Unrealized gains (losses) on available-for-sale securities, tax expense | $ 3 | $ 4 |
Foreign currency translation adjustments, income tax benefit |  |  | 8
Foreign currency translation adjustments, income tax expense | 6 | 5 |
Defined benefit plans, income tax benefit | 16 | 14 |
Defined benefit plans, income tax expense |  |  | 10
Change in fair value of derivative instruments, income tax benefit | 15 | 13 |
Change in fair value of derivative instruments, income tax expense |  |  | 5
Defined benefit plans, benefit reclassified into operations from other comprehensive income | 6 | 3 | 5
Interest expense on derivative instruments, benefit reclassified into operations from other comprehensive income | $ 5 |  |
Interest benefit on derivative instruments, expense reclassified into operations from other comprehensive income |  | $ 3 | $ 2

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