Restructuring and Asset Impairment Charges (Details) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Restructuring and Asset Impairment Charge [Abstract]
Asset impairments	$ 2	$ 0	$ 3	$ 0
Total restructuring and asset impairment costs	2	6	16	42
Cost of revenue [Member]
Restructuring and Asset Impairment Charge [Abstract]
Restructuring costs	0	3	6	12
Operating Expenses [Member]
Restructuring and Asset Impairment Charge [Abstract]
Restructuring costs	$ 0	$ 3	$ 7	$ 30