Income Taxes (Schedule Of Significant Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Accrued expenses	$ 42	$ 36
Interest rate hedge contracts	48	38
Share-based compensation	37	34
Net operating loss and credit carry-forwards	75	26
Other	19	19
Total deferred tax assets	221	153
Software development costs	(91)	(80)
Intangible assets	(630)	(608)
Property and equipment	(49)	(26)
Other	(24)	(29)
Total deferred tax liabilities	(794)	(743)
Total	$ (573)	$ (590)