Net Income (Loss) Per Common Share - Calculations for Basic and Diluted Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Numerator:
Net income (loss)—basic and diluted	$ (99)	$ (416)	$ 660	$ (1,500)
Denominator:
Basic weighted-average common shares outstanding (in shares)	156.9	158.0	157.0	159.3
Diluted weighted-average shares	156.9	158.0	158.2	159.3
Earnings (loss) per share:
Basic (in USD per share)	$ (0.63)	$ (2.63)	$ 4.20	$ (9.42)
Diluted (in USD per share)	$ (0.63)	$ (2.63)	$ 4.17	$ (9.42)
Number of anti-dilutive stock-based awards (in shares)	2.4	2.3	1.3	1.9
Stock Options
Denominator:
Effect of stock-based awards (in shares)	0.0	0.0	0.7	0.0
Nonvested shares
Denominator:
Effect of stock-based awards (in shares)	0.0	0.0	0.5	0.0