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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |
Income tax expense | $ (79) | $ (77) |
Effective income tax rate reconciliation, percent | 27.60% | 36.30% |
UNITED STATES |  |  |
Income Tax Contingency [Line Items] |  |  |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent | 21.00% | 35.00% |
Liberty | Tax Agreement |  |  |
Income Tax Contingency [Line Items] |  |  |
Current tax payments due to related parties | $ 109 |  | $ 60

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