Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Earnings Per Share [Abstract]
Net income (loss)	$ 812	$ 1,833	$ 4,001	$ 6,398
Weighted-average shares outstanding	416,542,101	435,318,088	421,290,032	443,595,026
Share-based compensation plans	3,076,855	3,123,550	3,733,449	3,032,989
Weighted-average shares outstanding and assumed conversions	419,618,956	438,441,638	425,023,481	446,628,015
Basic earnings (loss) per share (US$ per share)	$ 1.95	$ 4.21	$ 9.50	$ 14.42
Diluted earnings (loss) per share (US$ per share)	$ 1.94	$ 4.18	$ 9.41	$ 14.33
Potential anti-dilutive share conversions	1,693,502	1,758,853	1,377,784	1,439,882