Acquisitions/Divestitures (Divestitures) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			0 Months Ended	12 Months Ended	3 Months Ended	0 Months Ended		3 Months Ended	12 Months Ended	3 Months Ended	0 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Jan. 23, 2014 x86 Server Portfolio	Dec. 31, 2013 x86 Server Portfolio	Mar. 31, 2014 x86 Server Portfolio Estimated	Jan. 23, 2014 x86 Server Portfolio Maximum	Sep. 10, 2013 Customer Care Business Process Outsourcing Services	Mar. 31, 2014 Customer Care Business Process Outsourcing Services	Dec. 31, 2013 Customer Care Business Process Outsourcing Services	Mar. 31, 2014 Customer Care Business Process Outsourcing Services Minimum Estimated	Sep. 10, 2013 Customer Care Business Process Outsourcing Services Maximum	Mar. 31, 2014 Customer Care Business Process Outsourcing Services Maximum Estimated	Mar. 31, 2014 Retail Stores Solutions business	Mar. 31, 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			98		200		225	34	508
Revenues	22,484	23,408			4,600					1,300
Services	13,982	14,274
Pre-tax income	2,980	3,606								100
Tangible assets	$ 13,683		$ 13,821		$ 100					$ 50