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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) |

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