Income Taxes - Summary of Tax Provisions (Details) - 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]
Pre-tax income (loss) at estimated annual effective income tax rate before discrete items	$ 7	$ (4)	$ 73	$ 34
Impact of change in estimated annual effective tax rate on previous quarter’s pre-tax income	1	(2)	0	0
Interim period treatment of operational losses in foreign jurisdictions for which no tax benefit is recognized	0	(1)	1	0
Other discrete items	(12)	(41)	(9)	(39)
(Benefit) provision for income taxes	$ (4)	$ (48)	$ 65	$ (5)