CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Millions	Total IBM Stockholders' Equity	Common Stock and Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)	Non-Controlling Interests	Total
Balance at the Beginning of the Period at Dec. 31, 2020	$ 20,597	$ 56,556	$ 162,717	$ (169,339)	$ (29,337)	$ 129	$ 20,727
Net income/(loss) plus other comprehensive income/(loss):
Net income/(loss)	3,410		3,410				3,410
Other comprehensive income/(loss)	2,035				2,035		2,035
Total comprehensive income/(loss)	5,446						5,446
Cash dividends paid - common stock	(4,395)		(4,395)				(4,395)
Common stock issued under employee plans	632	632					632
Purchases and sales of treasury stock under employee plans - net	(52)		15	(66)			(52)
Changes in noncontrolling interests						(1)	(1)
Balance at the End of the Period at Sep. 30, 2021	22,228	57,189	161,747	(169,406)	(27,302)	129	22,357
Balance at the Beginning of the Period at Jun. 30, 2021	21,942	56,912	162,086	(169,404)	(27,652)	125	22,067
Net income/(loss) plus other comprehensive income/(loss):
Net income/(loss)	1,130		1,130				1,130
Other comprehensive income/(loss)	350				350		350
Total comprehensive income/(loss)	1,480						1,480
Cash dividends paid - common stock	(1,471)		(1,471)				(1,471)
Common stock issued under employee plans	277	277					277
Purchases and sales of treasury stock under employee plans - net	0		1	(2)			0
Changes in noncontrolling interests						4	4
Balance at the End of the Period at Sep. 30, 2021	22,228	57,189	161,747	(169,406)	(27,302)	129	22,357
Balance at the Beginning of the Period at Dec. 31, 2021	18,901	57,319	154,209	(169,392)	(23,234)	95	18,996
Net income/(loss) plus other comprehensive income/(loss):
Net income/(loss)	(1,071)		(1,071)				(1,071)
Other comprehensive income/(loss)	6,096				6,096		6,096
Total comprehensive income/(loss)	5,025						5,025
Cash dividends paid - common stock	(4,454)		(4,454)				(4,454)
Common stock issued under employee plans	736	736					736
Purchases and sales of treasury stock under employee plans - net	(133)		(10)	(122)			(133)
Other equity	0	63	(63)				0
Changes in noncontrolling interests						(23)	(23)
Balance at the End of the Period at Sep. 30, 2022	20,076	58,117	148,611	(169,514)	(17,138)	71	20,147
Balance at the Beginning of the Period at Jun. 30, 2022	19,409	57,802	153,298	(169,522)	(22,169)	67	19,476
Net income/(loss) plus other comprehensive income/(loss):
Net income/(loss)	(3,196)		(3,196)				(3,196)
Other comprehensive income/(loss)	5,030				5,030		5,030
Total comprehensive income/(loss)	1,834						1,834
Cash dividends paid - common stock	(1,491)		(1,491)				(1,491)
Common stock issued under employee plans	315	315					315
Purchases and sales of treasury stock under employee plans - net	8		0	8			8
Changes in noncontrolling interests						4	4
Balance at the End of the Period at Sep. 30, 2022	$ 20,076	$ 58,117	$ 148,611	$ (169,514)	$ (17,138)	$ 71	$ 20,147