Significant Components Of Deferred Tax Assets And Liabilities (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Schedule of Deferred Income Tax Assets and Liabilities [Line Items]
Accrued expenses	$ 27	$ 42
Interest rate hedge contracts	38	48
Share-based compensation	36	37
Net operating loss and credit carry-forwards	73	90
Other	29	19
Subtotal	203	236
Valuation allowance	(17)	(15)
Total deferred tax assets	186	221
Software development costs	(102)	(91)
Intangible assets	(609)	(630)
Property and equipment	(46)	(49)
Other	(25)	(24)
Total deferred tax liabilities	(782)	(794)
Total	$ (596)	$ (573)