Financial Instruments - Derivative Instruments Measured at Fair Value (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	$ 10	$ 29
Foreign currency contracts
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	2	1
Total Fair Value, Derivative Liabilities	1	6
Currency Swap
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	9	23
Fair Value of Derivatives Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	9	29
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Foreign currency contracts
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	0	0
Total Fair Value, Derivative Liabilities	0	6
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Currency Swap
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	9	23
Fair Value of Derivatives Designated as Hedging Instruments [Member] | Interest rate swaps
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	9
Fair Value of Derivatives Not Designated as Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	1	0
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Foreign currency contracts
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Assets	2	1
Total Fair Value, Derivative Liabilities	1	0
Fair Value of Derivatives Not Designated as Hedging Instruments [Member] | Currency Swap
Derivatives, Fair Value [Line Items]
Total Fair Value, Derivative Liabilities	$ 0	$ 0