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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Income tax expense | $ (85) | $ (80) | $ (266) | $ (232) |
Effective Income Tax Rate Reconciliation, Percent | 34.70% | 28.20% | 28.90% | 28.90% |
UNITED STATES |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate reconciliation, at federal statutory income tax rate, percent |  |  | 21.00% |  |
Liberty | Tax Agreement |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Due from Affiliates | $ (9) |  | $ (9) |  |
Current tax payments due to related parties |  |  |  |  | $ 47

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