Shareholders' Equity - Changes in Capital Stock (Details) - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share Repurchase Program [Roll Forward]
Balance (in shares)		1,800
Balance		$ 916
Balance (in shares)		(980)
Balance		$ (20,637)
Shares issued to benefit plans and for option exercises		340	$ 253	$ 210
Shares purchased for treasury		(163)		(221)
Other, net	[1]	$ (100)	$ (121)	$ (62)
Balance (in shares)		1,800	1,800
Balance		$ 921	$ 916
Balance (in shares)		(987)	(980)
Balance		$ (20,882)	$ (20,637)
Common stock
Share Repurchase Program [Roll Forward]
Balance (in shares)		1,831	1,820	1,815
Balance		$ 916	$ 910	$ 907
Shares issued to benefit plans and for option exercises (in shares)		10	11	5
Shares issued to benefit plans and for option exercises		$ 5	$ 6	$ 3
Balance (in shares)		1,841	1,831	1,820
Balance		$ 921	$ 916	$ 910
Treasury stock
Share Repurchase Program [Roll Forward]
Balance (in shares)		(980)	(977)	(970)
Balance		$ (20,637)	$ (20,532)	$ (20,263)
Shares purchased for treasury (in shares)		(4)		(6)
Shares purchased for treasury		$ (163)		$ (221)
Other, net (in shares)		(3)	(3)	(1)
Other, net	[1]	$ (82)	$ (105)	$ (48)
Balance (in shares)		(987)	(980)	(977)
Balance		$ (20,882)	$ (20,637)	$ (20,532)

[1] Treasury stock includes the deemed surrender to the Company of common stock to satisfy employee tax withholding obligations.