Description of Business and Summary of Significant Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Capitalized Software Development Costs [Abstract]
Capitalized Software Development Costs For Software Sold To Customers	$ 14.00	$ 20.00
Capitalized Computer Software Amortization	10.00	8.00	10.00
Capitalized Computer Software Additions	5.00	6.00
Operating Leases Income Statement Lease Revenue[Abstract]
Deferred Costs, Leasing, Net, Noncurrent	31.00	37.00
Amortization of Deferred Leasing Fees	19.00	27.00	25.00
Deferred Marketing Costs
Deferred Advertising Costs	84.00	106.00
Other Deferred Cost Amortization Expense	$ 34.00	$ 39.00	$ 44.00