Segment Reporting, Segment Revenue and Segment Profit (Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 primaryreportablesegment offerings	Jun. 30, 2011
Segment Reporting Information [Line Items]
Primary Reportable Segments, Number			2
Outsourcing Service Offerings			3
Segment Revenue	$ 5,541	$ 5,614	$ 11,044	$ 11,079
Segment Profit (Loss)	498	549	954	1,015
Services Segment [Member]
Segment Reporting Information [Line Items]
Segment Revenue	2,806	2,672	5,627	5,256
Segment Profit (Loss)	298	322	561	588
Technology Segment [Member]
Segment Reporting Information [Line Items]
Segment Revenue	2,370	2,552	4,708	5,047
Segment Profit (Loss)	268	300	513	566
All Other Segments [Member]
Segment Reporting Information [Line Items]
Segment Revenue	365	390	709	776
Segment Profit (Loss)	$ (68)	$ (73)	$ (120)	$ (139)