Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 8,539	$ 3,533	$ 4,454
Weighted-average shares outstanding	439,968,422	451,602,820	455,910,463
Share-based compensation plans	3,228,856	1,838,692	3,004,200
Adjusted weighted-average shares outstanding and assumed conversions	443,197,278	453,441,512	458,914,663
Basic earnings per share	$ 19.41	$ 7.82	$ 9.77
Diluted earnings per share	$ 19.27	$ 7.79	$ 9.71
Potential anti-dilutive share conversions	1,532,066	6,811,966	2,410,337