Note 14 - Shareholders' Equity - Changes in Capital Stock (Details) - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022	Dec. 31, 2021
Balance (in shares)		1,800
Balance		$ 910
Balance (in shares)		(977)
Balance		$ (20,532)
Shares issued to benefit plans and for option exercises		253		$ 210	$ 277
Shares purchased for treasury				(221)	(274)
Other, net (1)	[1]	$ (121)		$ (62)	$ (66)
Balance (in shares)		1,800		1,800
Balance		$ 916		$ 910
Balance (in shares)		(980)		(977)
Balance		$ (20,637)		$ (20,532)
Common Stock [Member]
Balance (in shares)		1,820		1,815	1,726
Balance		$ 910		$ 907	$ 863
Shares issued to benefit plans and for option exercises (in shares)		11		5	9
Shares issued to benefit plans and for option exercises		$ 6		$ 3	$ 4
Conversion of preferred stock to common stock (in shares)					115
Conversion of preferred stock to common stock					$ 58
Repurchase of converted common stock (in shares)					(35)
Repurchase of converted common stock					$ (18)
Balance (in shares)		1,831		1,820	1,815
Balance		$ 916		$ 910	$ 907
Treasury Stock, Common [Member]
Balance (in shares)		(977)		(970)	(961)
Balance		$ (20,532)		$ (20,263)	$ (19,928)
Shares purchased for treasury (in shares)				(6)	(7)
Shares purchased for treasury				$ (221)	$ (274)
Other, net (1) (in shares)		(3)	[2]	(1)	(2)
Other, net (1)	[1]	$ (105)		$ (48)	$ (61)
Shares purchased for treasury (in shares)				(6)	(7)
Balance (in shares)		(980)		(977)	(970)
Balance		$ (20,637)		$ (20,532)	$ (20,263)

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

[2] Includes the deemed surrender to the Company of common stock to satisfy employee tax withholding obligations.