Earnings Per Share (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Earnings Per Share [Abstract]
Net income (loss)	$ 1,215	$ 2,265	$ 3,189	$ 4,565
Weighted-average shares outstanding	421,624,660	445,094,678	423,703,328	447,802,079
Share-based compensation plans	3,793,686	2,857,242	3,982,116	2,900,440
Weighted-average shares outstanding and assumed conversions	425,418,346	447,951,920	427,685,444	450,702,519
Basic earnings (loss) per share (US$ per share)	$ 2.88	$ 5.09	$ 7.53	$ 10.20
Diluted earnings (loss) per share (US$ per share)	$ 2.86	$ 5.06	$ 7.46	$ 10.13
Potential anti-dilutive share conversions	1,690,893	1,777,555	1,196,180	1,879,882