Loss Per Share - Computation of Basic And Diluted Loss Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic and diluted:
Net loss attributable to common shareholders	$ (385)	$ (545)	$ (500)
Denominator:
Basic: Weighted average number of shares outstanding (in millions) (in shares)	111,880	111,560	101,620
Diluted: Weighted-average number of shares outstanding, assuming dilution (in millions) (in shares)	111,880	111,560	101,620
Basic loss per share (in dollars per share)	$ (3.44)	$ (4.89)	$ (4.92)
Diluted loss per share (in dollars per share)	$ (3.44)	$ (4.89)	$ (4.92)