Fair Value - Financial Instruments Carried at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Assets:
Derivatives	$ 59	$ 88
Mutual funds	58	60
Total	117	148
Liabilities:
Derivatives	63	186
Total	63	186
Level 1
Assets:
Derivatives	0	0
Mutual funds	58	60
Total	58	60
Liabilities:
Derivatives	0	0
Total	0	0
Level 2
Assets:
Derivatives	59	88
Mutual funds	0	0
Total	59	88
Liabilities:
Derivatives	63	186
Total	$ 63	$ 186