CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (USD $) In Millions, unless otherwise specified		Total		Total IBM Stockholders' Equity		Common Stock and Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Income/(Loss)	Non-Controlling Interests	Comprehensive Income/(Loss)
Equity - at Dec. 31, 2011		$ 20,236		$ 20,138		$ 48,129	$ 104,857	$ (110,963)	$ (21,885)	$ 97
Net income plus other comprehensive income/(loss)
Net income		3,066	[1]	3,066			3,066				3,066
Other comprehensive income/(loss)		770	[1]	770					770		770
Total comprehensive income/(loss)	[1]	3,837		3,837							3,837
Cash dividends declared - common stock		(870)		(870)			(870)
Common stock issued under employee plans (shares - 3,726,163 and 5,688,794 for the three months ended March 31, 2013 and 2012, respectively)		495		495		495
Purchases (shares - 629,550 and 864,073) and sales (shares - 648,990 and 1,021,123) of treasury stock under employee plans - net, for the three months ended March 31, 2013 and 2012, respectively		(72)		(72)			(18)	(54)
Other treasury shares purchased, not retired (shares - 12,318,883 and 15,544,014 for the three months ended March 31, 2013 and 2012, respectively)		(3,003)		(3,003)				(3,003)
Changes in other equity		176		176		176
Changes in noncontrolling interests		(15)								(15)
Equity - at Mar. 31, 2012		20,783		20,701		48,800	107,036	(114,020)	(21,115)	82
Equity - at Dec. 31, 2012		18,984		18,860		50,110	117,641	(123,131)	(25,759)	124
Net income plus other comprehensive income/(loss)
Net income		3,032		3,032			3,032				3,032
Other comprehensive income/(loss)		293		293					293		293
Total comprehensive income/(loss)		3,325		3,325	[1]						3,325	[1]
Cash dividends declared - common stock		(948)		(948)			(948)
Common stock issued under employee plans (shares - 3,726,163 and 5,688,794 for the three months ended March 31, 2013 and 2012, respectively)		361		361		361
Purchases (shares - 629,550 and 864,073) and sales (shares - 648,990 and 1,021,123) of treasury stock under employee plans - net, for the three months ended March 31, 2013 and 2012, respectively		(65)		(65)			(12)	(53)
Other treasury shares purchased, not retired (shares - 12,318,883 and 15,544,014 for the three months ended March 31, 2013 and 2012, respectively)		(2,493)		(2,493)				(2,493)
Changes in other equity		52		52		52
Changes in noncontrolling interests		(1)								(1)
Equity - at Mar. 31, 2013		$ 19,214		$ 19,092		$ 50,522	$ 119,713	$ (125,677)	$ (25,466)	$ 122

[1] Amounts may not add due to rounding.