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 Examination [Line Items]
Unrecognized tax benefit — Permanent tax positions	$ 2	$ 1
Unrecognized tax benefit — Temporary tax positions	1	1
Total unrecognized tax benefit	3	2	$ 3	$ 2	$ 3	$ 3
Additions for tax positions of prior years	1	1	0
Reductions for tax positions of prior years	0	(2)	0
NOL and tax credit carryforwards	(2)	(2)
Decrease in Unrecognized Tax Benefits is Reasonably Possible	1
Unrecognized Tax Benefits, Income Tax Penalties Expense	$ 0	$ 0	$ 0