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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense | $ (69) | $ (58) | $ (224) | $ (225) |
Effective income tax rate reconciliation, percent | 28.50% | 25.90% | 26.70% | 33.20% |
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 | $ 7 |  | $ 7 |  | $ 60

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