Income Taxes (Schedule Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Deferred revenues	$ 30	$ 28
U.S. federal net operating loss	15	20
Foreign net operating loss	99	104
State net operating loss	4	1
Compensation and benefits	88	77
Foreign currency translation	194	155
Lease reserves	19	8
Tax credits	19	5
Excess capital loss		64
Other	15	15
Gross deferred tax assets	483	477
Amortization of software development costs and depreciation	(40)	(25)
Amortization of acquired intangible assets	(629)	(653)
Accretion of debt discount	(4)	(19)
Other	(24)	(27)
Gross deferred tax liabilities	(697)	(724)
Net deferred tax liabilities before valuation allowance	(214)	(247)
Less: valuation allowance	(75)	(31)
Net deferred tax liabilities	$ (289)	$ (278)