Earnings Per Share of Common Stock - Computation (Details) - USD ($) $ / shares in Units, $ in Millions		3 Months Ended		9 Months Ended
		Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Number of shares on which basic earnings per share is calculated:
Weighted-average shares outstanding during period (in shares)		923,577,526	912,790,387	920,347,948	910,057,739
Add - Incremental shares under stock-based compensation plans (in shares)		0	8,531,982	12,829,572	8,241,752
Add - Incremental shares associated with contingently issuable shares (in shares)		0	2,350,932	2,247,712	2,024,201
Number of shares on which diluted earnings per share is calculated (in shares)		923,577,526	923,673,300	935,425,233	920,323,692
Net income on which basic earnings per share is calculated
Income/(loss) from continuing operations		$ (317)	$ 1,714	$ 3,088	$ 4,229
Income/(loss) from discontinued operations, net of tax		(13)	(10)	21	(15)
Net income/(loss)	[1]	(330)	1,704	3,109	4,214
Net income/(loss) on which diluted earnings per share is calculated
Income/(loss) from continuing operations		(317)	1,714	3,088	4,229
Net income applicable to contingently issuable shares		0	0	0	0
Income/(loss) from continuing operations on which diluted earnings per share is calculated		(317)	1,714	3,088	4,229
Income/(loss) from discontinued operations, net of tax, on which diluted earnings per share is calculated		(13)	(10)	21	(15)
Net income/(loss) on which diluted earnings per share is calculated		$ (330)	$ 1,704	$ 3,109	$ 4,214
Assuming dilution:
Continuing operations (in dollars per share)	[1]	$ (0.34)	$ 1.86	$ 3.30	$ 4.59
Discontinued operations (in dollars per share)	[1]	(0.01)	(0.01)	0.02	(0.02)
Total (in dollars per share)	[1]	(0.36)	1.84	3.32	4.58
Basic:
Continuing operations (in dollars per share)	[1]	(0.34)	1.88	3.36	4.65
Discontinued operations (in dollars per share)	[1]	(0.01)	(0.01)	0.02	(0.02)
Total (in dollars per share)	[1]	$ (0.36)	$ 1.87	$ 3.38	$ 4.63

[1] 2024 includes the impact of a one-time, non-cash pension settlement charge. Refer to note 18, "Retirement-Related Benefits," for additional information.