Income Taxes - Schedule of Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Income before income taxes	$ 497	$ 22	$ 1,270	$ 136
Estimated annualized effective tax rate			26.70%	136.40%
Income tax expense			$ 339	$ 185
Favorable tax impact related to losses in jurisdictions with no tax benefit			(7)	(17)
Discrete tax benefit			(1)	(1)
Provision for income taxes	$ 127	$ 42	$ 331	$ 167