Derivatives and Hedging - Summary of Realized and Unrealized Gains (Losses) Recognized in Consolidated Statements of Income on Derivative Instruments (Detail) - USD ($) $ in Millions |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2020 |
Dec. 31, 2019 |
Dec. 31, 2018 |
|
| Derivative Instruments Gain Loss [Line Items] | |||
| Total gain (loss) from derivative instruments | $ (46) | $ (51) | $ (70) |
| Forward Foreign Currency Exchange Contracts [Member] | General and Administration Expense [Member] | |||
| Derivative Instruments Gain Loss [Line Items] | |||
| Total gain (loss) from derivative instruments | 47 | 55 | (124) |
| Total Return Swaps [Member] | Nonoperating Income (Expense) [Member] | |||
| Derivative Instruments Gain Loss [Line Items] | |||
| Total gain (loss) from derivative instruments | $ (93) | $ (106) | $ 54 |