Income Taxes - Schedule of Income Taxes (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Tax Disclosure [Abstract]
Income (loss) before income taxes	$ 22	$ (52)	$ 136	$ (137)
Estimated annualized effective tax rate			136.40%	(686.20%)
Income tax expense			$ 185	$ 942
Favorable tax impact related to losses in jurisdictions with no tax benefit			(17)	(590)
Discrete tax (benefit) expense			(1)	9
Provision for income taxes	$ 42	$ 95	$ 167	$ 361