Income Taxes - Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Summary of unrecognized income tax benefits
Unrecognized tax benefits balance at beginning of year	$ 35	$ 51	$ 48
Additions for tax positions of current year	5	8	7
Additions for tax positions of prior years	1	0	2
Reductions for tax positions of prior years	0	(3)	0
Reductions for settlements of tax positions	0	(2)	0
Reductions for lapses in statutes of limitations	(6)	(19)	(6)
Unrecognized tax benefits balance at end of year	$ 35	$ 35	$ 51