Income Taxes - Unrecognized Tax Benefis (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits, Beginning Balance	$ 133	$ 127
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions	3	4
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions	(16)	(1)
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions	8	18
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities	(14)	(13)
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations	(10)	(2)
Unrecognized Tax Benefits, Ending Balance	$ 104	$ 133