Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net income (loss)	$ 1,974	$ 2,300
Weighted-average shares outstanding	425,805,105	450,539,568
Share-based compensation plans	3,985,729	2,795,971
Weighted-average shares outstanding and assumed conversions	429,790,834	453,335,539
Basic earnings (loss) per share (US$ per share)	$ 4.64	$ 5.10
Diluted earnings (loss) per share (US$ per share)	$ 4.59	$ 5.07
Potential anti-dilutive share conversions	681,032	1,952,612