Software Development Costs and Intellectual Property Licenses (Details) (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013
Software development and intellectual property licenses:
Internally developed software costs	$ 186,000,000		$ 189,000,000
Payments made to third-party software developers	219,000,000		199,000,000
Total software development costs	405,000,000		388,000,000
Intellectual property licenses	12,000,000		11,000,000
Amortization, write-offs and impairments:
Amortization of capitalized software development costs and intellectual property licenses	58,000,000	62,000,000
Write-offs and impairments	$ 0	$ 26,000,000