Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 segment	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating revenues by products and services
Other operating revenues	$ 4,542	$ 4,515	$ 4,525	$ 4,513	$ 4,583	$ 4,571	$ 4,612	$ 4,610		$ 18,095	$ 18,376	$ 15,351
Surcharge amount on customers' bills										489	531	392
Number of operating segments (segments)									4
Strategic services
Operating revenues by products and services
Other operating revenues										8,822	8,427	6,313
Segment reclassification adjustment											104	51
Legacy services
Operating revenues by products and services
Other operating revenues										7,617	8,221	7,621
Segment reclassification adjustment										38
Data integration
Operating revenues by products and services
Other operating revenues										656	672	537
Other
Operating revenues by products and services
Other operating revenues										$ 1,000	$ 1,056	$ 880