Income Taxes - Summary of Tax Provisions (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Income Tax Disclosure [Abstract]
Pre-tax income (loss) at estimated annual effective income tax rate before discrete items	$ 32	$ (31)	$ 65	$ 40
Impact of change in estimated annual effective tax rate on previous quarter’s pre-tax income	(1)	18	0	0
Interim period treatment of operational losses in foreign jurisdictions for which no tax benefit is recognized	1	1	1	1
Other discrete items	4	10	3	2
Provision (benefit) for income taxes	$ 36	$ (2)	$ 69	$ 43