Income Taxes - Changes in Unrecognized Tax Benefit (Including Interest and Penalties) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning Balance	$ 16	$ 13	$ 13
Additions for tax positions for current year	21	5	4
Additions for tax positions for prior years	0	1	0
Reduction for tax positions for prior years	0	(1)	(1)
Lapse of the applicable statute of limitations	0	(1)	(2)
Reduction as a result of settlement	0	(1)	(1)
Ending Balance	37	16	13
Interest and Penalties
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning Balance	2	1	1
Additions for tax positions for current year	0	0	0
Additions for tax positions for prior years	1	1	1
Reduction for tax positions for prior years	0	0	0
Lapse of the applicable statute of limitations	0	0	(1)
Reduction as a result of settlement	0	0	0
Ending Balance	3	2	1
Total
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Beginning Balance	18	14	14
Additions for tax positions for current year	21	5	4
Additions for tax positions for prior years	1	2	1
Reduction for tax positions for prior years	0	(1)	(1)
Lapse of the applicable statute of limitations	0	(1)	(3)
Reduction as a result of settlement	0	(1)	(1)
Ending Balance	$ 40	$ 18	$ 14