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, 2010	$ 23,172		$ 23,046	$ 45,418	$ 92,532	$ (96,161)	$ (18,743)	$ 126
Net income plus other comprehensive income/(loss)
Net income	6,526	[1]	6,526		6,526				6,526
Other comprehensive income/(loss)	1,634		1,634				1,634		1,634
Total comprehensive income/(loss)	8,160		8,160						8,160
Cash dividends declared - common stock	(1,700)		(1,700)		(1,700)
Common stock issued under employee plans (shares - 10,092,817 and 13,794,550 for the six months ended June 30, 2012 and 2011, respectively)	1,383		1,383	1,383
Purchases (shares - 1,905,803 and 1,416,882) and sales (shares - 2,034,612 and 3,461,423) of treasury stock under employee plans - net, for the six months ended June 30, 2012 and 2011, respectively)	105		105		(24)	129
Other treasury shares purchased, not retired (shares - 30,629,597 and 49,554,480 for the six months ended June 30, 2012 and 2011, respectively)	(8,041)		(8,041)			(8,041)
Changes in other equity	173		173	173
Changes in noncontrolling interests	(43)							(43)
Equity - at Jun. 30, 2011	23,210		23,127	46,975	97,334	(104,073)	(17,109)	84
Equity - at Dec. 31, 2011	20,236	[1]	20,138	48,129	104,857	(110,963)	(21,885)	97
Net income plus other comprehensive income/(loss)
Net income	6,948		6,948		6,948				6,948
Other comprehensive income/(loss)	387		387				387		387
Total comprehensive income/(loss)	7,335		7,335						7,335
Cash dividends declared - common stock	(1,848)		(1,848)		(1,848)
Common stock issued under employee plans (shares - 10,092,817 and 13,794,550 for the six months ended June 30, 2012 and 2011, respectively)	780		780	780
Purchases (shares - 1,905,803 and 1,416,882) and sales (shares - 2,034,612 and 3,461,423) of treasury stock under employee plans - net, for the six months ended June 30, 2012 and 2011, respectively)	(174)		(174)		(29)	(146)
Other treasury shares purchased, not retired (shares - 30,629,597 and 49,554,480 for the six months ended June 30, 2012 and 2011, respectively)	(6,007)		(6,007)			(6,007)
Changes in other equity	248		248	248
Changes in noncontrolling interests	(6)							(6)
Equity - at Jun. 30, 2012	$ 20,563	[1]	$ 20,472	$ 49,157	$ 109,928	$ (117,116)	$ (21,498)	$ 92

[1] Amounts may not add due to rounding.