Income Taxes - Narrative (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]
Effective income tax rate reconciliation (percent)	29.10%	36.10%	29.10%	36.10%
Effective income tax rate reconciliation, including discrete items (percent)	32.70%	2.30%	30.90%	38.40%
Discrete income tax charge (benefit)	$ 4	$ (10)	$ 3	$ 2
Charge from tax rate change	2		2
Income tax charge related to remeasurement as a result of the Separation Transaction		6		6
Other items charge (benefit)	$ 2		$ 1	(2)
Income tax charge (benefit) related to prior year items		$ 4		3
Tax charge (benefit) for stock compensation				$ (5)