Income Taxes -Reconciliation of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Beginning balance	$ 153	$ 145
Additions based on tax positions related to the current year	24	19
Additions for tax positions of prior years	13	6
Reductions based on tax positions related to the current year	(19)	(14)
Reductions for tax positions of prior years	(83)	(1)
Statute of limitations	0	(4)
Settlements	(1)
Settlements		1
Interest and penalties	10	1
Ending balance	$ 97	$ 153