Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019	Dec. 31, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Effective income tax rate reconciliation (percent)	36.10%	51.80%	36.10%	51.80%
Effective income tax rate reconciliation, including discrete items (percent)	(2.30%)	(49.30%)	2.30%	(49.30%)
Discrete income tax charge (benefit)	$ 10	$ (37)		$ (37)
Income tax charge related to remeasurement as a result of the Separation Transaction	6
Income tax charge for prior year items	4
Income tax benefit from deduction of prior year foreign taxes		(25)		25
Income tax benefit from remeasurement of certain deferred tax assets		$ 12		$ 12
Tax misstatement recorded to retained earnings	$ 223		$ 223		$ 129
Revision of Prior Period, Error Correction, Adjustment
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Tax misstatement recorded to retained earnings						$ 16