Fair Value - Financial Instruments Carried at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Assets:
Derivatives	$ 66	$ 88
Mutual funds	60	60
Total	126	148
Liabilities:
Derivatives	112	186
Total	112	186
Level 1
Assets:
Derivatives	0	0
Mutual funds	60	60
Total	60	60
Liabilities:
Derivatives	0	0
Total	0	0
Level 2
Assets:
Derivatives	66	88
Mutual funds	0	0
Total	66	88
Liabilities:
Derivatives	112	186
Total	$ 112	$ 186