Segment Reporting (Details) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Segment Reporting Information [Line Items]
Segment Revenue	$ 5,614	$ 5,508	$ 11,079	$ 10,229
Segment Profit (Loss)	549	499	1,015	831
Segment Reporting Information Technology [Member]
Segment Reporting Information [Line Items]
Segment Revenue	2,552	2,555	5,047	5,038
Segment Profit (Loss)	300	273	566	506
Segment Reporting Information Services [Member]
Segment Reporting Information [Line Items]
Segment Revenue	2,672	2,529	5,256	4,372
Segment Profit (Loss)	322	319	588	522
Segment Reporting Information Other [Member]
Segment Reporting Information [Line Items]
Segment Revenue	390	424	776	819
Segment Profit (Loss)	$ (73)	$ (93)	$ (139)	$ (197)