Earnings Per Share of Common Stock - Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Number of shares on which basic earnings per share is calculated:
Weighted-average shares outstanding during period (in shares)	899,316,026	893,630,916	[1]
Add - Incremental shares under stock-based compensation plans (in shares)	8,375,246	6,622,441
Add - Incremental shares associated with contingently issuable shares (in shares)	1,534,864	1,492,709
Number of shares on which diluted earnings per share is calculated (in shares)	909,226,136	901,746,065	[1]
Net income on which basic earnings per share is calculated
Income from continuing operations	$ 662	$ 403
Income from discontinued operations, net of tax	71	552
Net income on which basic earnings per share is calculated	733	955
Net income on which diluted earnings per share is calculated
Income from continuing operations	662	403
Income from continuing operations on which diluted earnings per share is calculated	662	403
Income from discontinued operations, net of tax, on which basic and diluted earnings per share is calculated	71	552
Net income on which diluted earnings per share is calculated	$ 733	$ 955
Assuming dilution
Continuing operations (in dollars per share)	$ 0.73	$ 0.45	[1]
Discontinued operations (in dollars per share)	0.08	0.61	[1]
Total (in dollars per share)	0.81	1.06	[1]
Basic
Continuing operations (in dollars per share)	0.74	0.45	[1]
Discontinued operations (in dollars per share)	0.08	0.62	[1]
Total (in dollars per share)	$ 0.82	$ 1.07	[1]

[1] Reclassified to reflect discontinued operations presentation.