Software Development Costs and Intellectual Property Licenses (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Software development and intellectual property licenses:
Internally developed software costs	$ 189	$ 159
Payments made to third-party software developers	199	134
Total software development costs	388	293
Intellectual property licenses	11	41
Amortization, write-offs and impairments:
Amortization of capitalized software development costs and intellectual property licenses	195	205	258
Write-offs and impairments	$ 29	$ 12	$ 60