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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended | 22 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2016 | Jun. 30, 2016 | Dec. 31, 2012
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Undistributed earnings | $ 144 |  |  |  |  |
Income tax benefits primarily related to share-based compensation | 41 | $ 34 | $ 9 |  |  |
Unrecognized tax benefits that would impact effective tax rate | 40 | 33 |  |  |  |
Interest and penalties related to income tax | 8 | 7 |  |  |  |
Reserve for uncertainty of tax matters | 5 |  |  |  |  |
Previously unrecognized tax benefits recognized | 4 | 2 |  |  |  |
Federal Tax Authority |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Tax Benefit |  |  |  | $ 10 |  |
Foreign Tax Authority | SE |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Unrecognized tax benefits that would impact effective tax rate |  | 5 |  |  |  |
Additional tax assessment |  | 6 |  |  |  |
Decrease in operating expenses associated with receivable under tax sharing agreement |  | 6 |  |  |  |
Reversal of VAT refund receivables | $ 38 |  |  |  |  | $ 50
Tax expense (benefits), per diluted share (in dollars per share) | $ 0.22 |  |  |  |  |
Increase in tax expense related to receivable under tax sharing agreement |  | $ 12 |  |  |  |
Foreign Tax Authority | FI |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Reversal of VAT refund receivables |  |  |  | 30 | $ 28 |
Income taxes paid |  |  |  | 41 |  |
Interest and penalties paid |  |  |  | 11 |  |
Tax expense (benefits), per diluted share (in dollars per share) |  |  |  |  | $ 0.17 |
Tax benefits, and related interest and penalties |  |  |  | $ 38 |  |
Quarterly recurring tax benefits | $ 1 |  |  |  |  |
Foreign Tax Authority | Minimum | SE |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Quarterly recurring tax benefits | 1 |  |  |  |  |
Foreign Tax Authority | Maximum | SE |  |  |  |  |  |
Income Tax Disclosure [Line Items] |  |  |  |  |  |
Quarterly recurring tax benefits | $ 2 |  |  |  |  |

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