Acquisitions/Divestitures (Divestitures) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended			0 Months Ended	12 Months Ended	6 Months Ended	0 Months Ended		3 Months Ended		0 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013	Dec. 31, 2013	Jan. 23, 2014 x86 Server Portfolio	Dec. 31, 2013 x86 Server Portfolio	Jun. 30, 2014 x86 Server Portfolio Estimated	Jan. 23, 2014 x86 Server Portfolio Maximum	Sep. 10, 2013 Customer Care Business Process Outsourcing Services	Jun. 30, 2014 Customer Care Business Process Outsourcing Services	Mar. 31, 2014 Customer Care Business Process Outsourcing Services	Sep. 10, 2013 Customer Care Business Process Outsourcing Services Maximum	Jun. 30, 2014 Retail Stores Solutions business	Jun. 30, 2014 Retail Stores Solutions business	Jun. 30, 2014 Retail Stores Solutions business Estimated
Divestitures
Transaction price for sale of business						$ 2,300				$ 501
Approximate amount of transaction price received in cash						2,000				430
Noncash consideration received on sale of business										71
Equity Ownership percent acquired									5.00%				5.00%
Pre-tax gain on sale of business								1,000			121	98		2	36	508
Revenues	24,364	24,924	46,848	48,332			4,600
Services	14,128	14,312	28,110	28,586
Pre-tax income	5,171	4,144	8,151	7,750
Tangible assets	$ 13,748		$ 13,748		$ 13,821		$ 100