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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Deferred revenues $ 39 $ 46
U.S. federal net operating loss 2 5
Foreign net operating loss 37 92
State net operating loss 1 2
Compensation and benefits 99 86
Foreign currency translation 528 458
Tax credits 7 7
Other 34 32
Gross deferred tax assets 747 728
Amortization of software development costs and depreciation (63) (56)
Amortization of acquired intangible assets (596) (522)
Investments (37) (35)
Other (24) (13)
Gross deferred tax liabilities (720) (626)
Net deferred tax assets before valuation allowance 27 102
Less: valuation allowance (30) (85)
Net deferred tax assets (liabilities)   $ 17
Net deferred tax assets (liabilities) $ (3)