Income Taxes - Summary of Tax Provisions (Details) - 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]
Pre-tax income (loss) at estimated annual effective income tax rate before discrete items	$ (4)	$ 124	$ 34	$ 9
Impact of change in estimated annual effective tax rate on previous quarter’s pre-tax income	(2)	(37)	0	0
Interim period treatment of operational losses in foreign jurisdictions for which no tax benefit is recognized	(1)	4	0	18
Other discrete items	(41)	14	(39)	(23)
Provision (benefit) for income taxes	$ (48)	$ 105	$ (5)	$ 4