Acquisitions/Divestitures (Divestitures) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended		0 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012 Customer Care Business Process Outsourcing Services	Dec. 31, 2012 Customer Care Business Process Outsourcing Services Sales	Sep. 10, 2013 Customer Care Business Process Outsourcing Services Estimated	Sep. 30, 2013 Customer Care Business Process Outsourcing Services Minimum Estimated	Sep. 30, 2013 Customer Care Business Process Outsourcing Services Maximum Estimated
Business Acquisition [Line Items]
Transaction price for sale of business							$ 505
Amount of transaction price received in cash, net of balance sheet adjustments							430
Amount of transaction price received in stock							75
Equity Ownership percent acquired							5.00%
Pre-tax gain on sale of business								125	175
Services revenue	14,225	14,626	42,811	44,279	1,300
Percent of the consolidated revenue						1.00%
Pre-tax income	$ 4,812	$ 5,074	$ 12,562	$ 14,071	$ 100