Goodwill, Capitalized Software and Other Intangible Assets 3 (Details) $ in Millions	3 Months Ended
	Jun. 30, 2015 USD ($)
Goodwill activity by segment
Balance at March 31, 2015	$ 5,806
Acquisitions	8
Foreign currency translation adjustment	3
Balance at June 30, 2015	5,817
Mainframe Solutions
Goodwill activity by segment
Balance at March 31, 2015	4,178
Acquisitions	0
Foreign currency translation adjustment	0
Balance at June 30, 2015	4,178
Enterprise Solutions
Goodwill activity by segment
Balance at March 31, 2015	1,547
Acquisitions	8
Foreign currency translation adjustment	3
Balance at June 30, 2015	1,558
Services
Goodwill activity by segment
Balance at March 31, 2015	81
Acquisitions	0
Foreign currency translation adjustment	0
Balance at June 30, 2015	$ 81