Derivative Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - Not Designated as Hedging Instrument - Foreign Exchange Swaps - Fair Value, Measurements, Recurring - Less Than Six Months - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Derivative notional volume, amount after offsetting swaps	$ 1,300	$ 1,463
Other current assets
Derivatives, Fair Value [Line Items]
Derivative asset, amount after offsetting swaps	1	25
Other current liabilities
Derivatives, Fair Value [Line Items]
Derivative liability, amount after offsetting swaps	$ 16	$ 3