Earnings Per Share - Reconciliation of the Earnings (Losses) and Number of Shares Used in Calculations of Basic and Diluted Earnings Per Share (Detail) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended				6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2022	Jun. 30, 2021
Computation of Basic Earnings Per Share
Net income	$ 678	$ 377	$ 422	$ (11)	$ 1,055	$ 411
Shares for basic earnings per share (in shares)	328.2		327.1		328.3	326.9
Basic (in USD per share)	$ 2.06		$ 1.29		$ 3.21	$ 1.26
Computation of Diluted Earnings Per Share
Net income	$ 678	$ 377	$ 422	$ (11)	$ 1,055	$ 411
Shares for basic earnings per share (in shares)	328.2		327.1		328.3	326.9
Effect of dilutive securities
Stock-based compensation (in shares)	1.3		2.0		1.5	2.1
Shares for diluted earnings per share (in shares)	329.5		329.1		329.8	329.0
Diluted (in USD per share)	$ 2.06		$ 1.28		$ 3.20	$ 1.25