Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012 item	Sep. 30, 2011
Operating revenues by products and services
Other operating revenue	$ 4,571	$ 4,596	$ 13,793	$ 10,698
Surcharge amount on customers' bills			398	268
Number of groups of products and services			4
Strategic services
Operating revenues by products and services
Other operating revenue	2,101	1,960	6,237	4,229
Legacy services
Operating revenues by products and services
Other operating revenue	2,045	2,223	6,284	5,494
Data integration
Operating revenues by products and services
Other operating revenue	168	166	483	349
Other
Operating revenues by products and services
Other operating revenue	$ 257	$ 247	$ 789	$ 626