Net Income (Loss) Per Common Share - Calculations for Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net income (loss)—basic and diluted	$ (418)	$ 153	$ (1,499)	$ 1,476
Denominator:
Basic weighted-average common shares outstanding (in shares)	158.0	161.1	159.3	161.1
Diluted weighted-average shares	158.0	162.9	159.3	162.8
Earnings (loss) per share:
Basic (in USD per share)	$ (2.64)	$ 0.95	$ (9.41)	$ 9.16
Diluted (in USD per share)	$ (2.64)	$ 0.94	$ (9.41)	$ 9.07
Number of anti-dilutive stock-based awards (in shares)	2.3	0.4	1.9	0.9
Stock Options
Denominator:
Effect of stock-based awards (in shares)	0.0	1.2	0.0	1.1
Nonvested shares
Denominator:
Effect of stock-based awards (in shares)	0.0	0.6	0.0	0.6