Earnings Per Share of Common Stock - Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021		Jun. 30, 2022	Jun. 30, 2021
Number of shares on which basic earnings per share is calculated:
Weighted-average shares outstanding during period (in shares)	901,470,793	895,043,024	[1]	900,393,410	894,336,970	[1]
Add - Incremental shares under stock-based compensation plans (in shares)	7,518,749	7,431,661		7,946,998	7,027,051
Add - Incremental shares associated with contingently issuable shares (in shares)	1,760,192	1,758,754		1,647,528	1,625,732
Number of shares on which diluted earnings per share is calculated (in shares)	910,749,734	904,233,439	[1]	909,987,935	902,989,752	[1]
Net income on which basic earnings per share is calculated
Income from continuing operations	$ 1,465	$ 810		$ 2,127	$ 1,213
Income/(loss) from discontinued operations, net of tax	(73)	515		(2)	1,067
Net income on which basic earnings per share is calculated	1,392	1,325		2,125	2,280
Net income on which diluted earnings per share is calculated
Income from continuing operations	1,465	810		2,127	1,213
Income from continuing operations on which diluted earnings per share is calculated	1,465	810		2,127	1,213
Income/(loss) from discontinued operations, net of tax, on which diluted earnings per share is calculated	(73)	515		(2)	1,067
Net income on which diluted earnings per share is calculated	$ 1,392	$ 1,325		$ 2,125	$ 2,280
Assuming dilution
Continuing operations (in dollars per share)	$ 1.61	$ 0.90	[1]	$ 2.34	$ 1.34	[1]
Discontinued operations (in dollars per share)	(0.08)	0.57	[1]	0.00	1.18	[1]
Total (in dollars per share)	1.53	1.47	[1]	2.34	2.52	[1]
Basic
Continuing operations (in dollars per share)	1.62	0.91	[1]	2.36	1.36	[1]
Discontinued operations (in dollars per share)	(0.08)	0.57	[1]	0.00	1.19	[1]
Total (in dollars per share)	$ 1.54	$ 1.48	[1]	$ 2.36	$ 2.55	[1]

[1] Reclassified to reflect discontinued operations presentation.