Unrealized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2021	Jan. 01, 2020	Jan. 01, 2019
Income Tax [Line Items]
Unrecognized tax benefit — Permanent tax positions	$ 4	$ 3
Unrecognized tax benefit — Temporary tax positions	4	4
Balance at Dec. 31	8	7	$ 5	$ 7	$ 5	$ 5
Additions based on tax positions related to the current year	1	1	0
Additions for tax positions of prior years	0	5	0
Reductions for tax positions of prior years	0	4	0
NOL and tax credit carryforwards	(7)	(6)
Decrease in Unrecognized Tax Benefits is Reasonably Possible	5
(Payable) receivable for interest related to unrecognized tax benefits at Jan. 1	(1)	(1)	1	$ (1)	$ 1	$ 1
Interest expense related to unrecognized tax benefits	0	(2)	0
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 0	$ 0	$ 0