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	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 - 7,367,440 and 10,092,817 for the six months ended June 30, 2013 and 2012, respectively)	780	780	780
Purchases (shares - 1,399,751 and 1,905,803) and sales (shares - 1,480,251 and 2,034,612) of treasury stock under employee plans - net, for the six months ended June 30, 2013 and 2012, respectively	(174)	(174)		(29)	(146)
Other treasury shares purchased, not retired (shares - 29,389,794 and 30,629,597 for the six months ended June 30, 2013 and 2012, 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	20,472	49,157	109,928	(117,116)	(21,498)	92
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	6,258	6,258		6,258				6,258
Other comprehensive income/(loss)	(16)	(16)				(16)		(16)
Total comprehensive income/(loss)	6,242	6,242						6,242
Cash dividends declared - common stock	(1,996)	(1,996)		(1,996)
Common stock issued under employee plans (shares - 7,367,440 and 10,092,817 for the six months ended June 30, 2013 and 2012, respectively)	668	668	668
Purchases (shares - 1,399,751 and 1,905,803) and sales (shares - 1,480,251 and 2,034,612) of treasury stock under employee plans - net, for the six months ended June 30, 2013 and 2012, respectively	(132)	(132)		(19)	(113)
Other treasury shares purchased, not retired (shares - 29,389,794 and 30,629,597 for the six months ended June 30, 2013 and 2012, respectively)	(5,994)	(5,994)			(5,994)
Changes in other equity	108	108	108
Changes in noncontrolling interests	4						4
Equity - at Jun. 30, 2013	$ 17,883	$ 17,756	$ 50,886	$ 121,883	$ (129,239)	$ (25,774)	$ 127