Segment Information (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Operating revenues by products and services
Other operating revenue	$ 4,610	$ 1,696
Surcharge amount on customers' bills	135	30
Strategic services
Operating revenues by products and services
Other operating revenue	2,056	539
Legacy services
Operating revenues by products and services
Other operating revenue	2,143	995
Data integration
Operating revenues by products and services
Other operating revenue	145	31
Other
Operating revenues by products and services
Other operating revenue	$ 266	$ 131