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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |  |
Income tax expense | $ 90 | $ 72 | $ 157 | $ 226 |  |
Effective income tax rate percent | 20.80% | 20.90% | 13.60% | 21.90% |  |
Audit settlement | $ 95 |  | $ 95 |  |  |
Valuation allowance | $ 76 |  | $ 76 |  |  | $ 54
Common Stock | Liberty Media |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Related party ownership percentage | 79.00% |  | 79.00% |  |  |
Forecast |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Effective income tax rate percent |  |  |  |  | 16.00% |
Forecast | Liberty Media | Common Stock |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Related party ownership percentage |  |  |  |  | 80.00% |

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