Earnings/(Loss) Per Share of Common Stock - Computation (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022		Sep. 30, 2023	Sep. 30, 2022
Number of shares on which basic earnings per share is calculated:
Weighted-average shares outstanding during period (in shares)	912,790,387	904,076,831		910,057,739	901,621,217
Add - Incremental shares under stock-based compensation plans (in shares)	8,531,982	0		8,241,752	0
Add - Incremental shares associated with contingently issuable shares (in shares)	2,350,932	0		2,024,201	0
Number of shares on which diluted earnings per share is calculated (in shares)	923,673,300	904,076,831		920,323,692	901,621,217
Net income on which basic earnings per share is calculated
Income/(loss) from continuing operations	$ 1,714	$ (3,214)		$ 4,229	$ (1,087)
Income/(loss) from discontinued operations, net of tax	(10)	18		(15)	16
Net income/(loss)	1,704	(3,196)	[1]	4,214	(1,071)	[1],[2]
Net income/(loss) on which diluted earnings per share is calculated
Income/(loss) from continuing operations	1,714	(3,214)		4,229	(1,087)
Net income applicable to contingently issuable shares	0	0		0	0
Income/(loss) from continuing operations on which diluted earnings per share is calculated	1,714	(3,214)		4,229	(1,087)
Income/(loss) from discontinued operations, net of tax, on which diluted earnings per share is calculated	(10)	18		(15)	16
Net income/(loss) on which diluted earnings per share is calculated	$ 1,704	$ (3,196)		$ 4,214	$ (1,071)
Assuming dilution:
Continuing operations (in dollars per share)	$ 1.86	$ (3.55)		$ 4.59	$ (1.21)
Discontinued operations (in dollars per share)	(0.01)	0.02		(0.02)	0.02
Total (in dollars per share)	1.84	(3.54)		4.58	(1.19)
Basic:
Continuing operations (in dollars per share)	1.88	(3.55)		4.65	(1.21)
Discontinued operations (in dollars per share)	(0.01)	0.02		(0.02)	0.02
Total (in dollars per share)	$ 1.87	$ (3.54)		$ 4.63	$ (1.19)

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

[2] ncludes immaterial cash flows from discontinued operations.