Consolidated Statements of Shareholder's Equity (Unaudited) - USD ($) $ in Millions	Total	Common stock	Additional paid- in capital	Accumulated other comprehensive loss	Accumulated deficit
Balance at beginning of period at Dec. 31, 2020	$ 1,427	$ 1	$ 4,633	$ (70)	$ (3,137)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	28			(1)	29
Balance at end of period at Mar. 31, 2021	1,455	1	4,633	(71)	(3,108)
Balance at beginning of period at Dec. 31, 2021	1,593	1	4,633	(58)	(2,983)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)	42			6	36
Balance at end of period at Mar. 31, 2022	$ 1,635	$ 1	$ 4,633	$ (52)	$ (2,947)