Note 16 - Shareholders' Equity - Changes in Capital Stock (Details) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022		Dec. 31, 2021		Dec. 31, 2020
Balance (in shares)	1,800
Balance	$ 907
Balance (in shares)	(970)
Balance	$ (20,263)
Shares issued to benefit plans and for option exercises	210		$ 277		$ 323
Shares purchased for treasury	(221)		(274)		(105)
Other, net (1)	$ (62)		$ (66)	[1]	$ (45)
Balance (in shares)	1,800		1,800
Balance	$ 910		$ 907
Balance (in shares)	(977)		(970)
Balance	$ (20,532)		$ (20,263)
Common Stock [Member]
Balance (in shares)	1,815		1,726		1,718
Balance	$ 907		$ 863		$ 859
Shares issued to benefit plans and for option exercises (in shares)	5		9		8
Shares issued to benefit plans and for option exercises	$ 3		$ 4		$ 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)	1,820		1,815		1,726
Balance	$ 910		$ 907		$ 863
Treasury Stock [Member]
Balance (in shares)	(970)		(961)		(956)
Balance	$ (20,263)		$ (19,928)		$ (19,812)
Shares purchased for treasury (in shares)	(6)		(7)		(4)
Shares purchased for treasury	$ (221)		$ (274)		$ (105)
Other, net (1) (in shares)	(1)	[2]	(2)		(1)
Other, net (1)	$ (48)		$ (61)	[1]	$ (11)
Shares purchased for treasury (in shares)	(6)		(7)		(4)
Balance (in shares)	(977)		(970)		(961)
Balance	$ (20,532)		$ (20,263)		$ (19,928)

[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