Software Development Costs and Intellectual Property Licenses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Software development and intellectual property licenses:
Internally developed software costs	$ 115	$ 142
Payments made to third-party software developers	84	60
Total software development costs	199	202
Intellectual property licenses	34	73
Amortization, write-offs and impairments:
Amortization of capitalized software development costs and intellectual property licenses	258	319	314
Write-offs and impairments	$ 60	$ 66	$ 21