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Income Taxes - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Mar. 31, 2021 | Oct. 31, 2020 | Jul. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |  |  |
Consolidated effective income tax rate (percent) |  |  |  |  | 29.00% | 102.00%
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  | $ 252 |  |
Proceeds from Income Tax Refunds | $ 23 | $ 24 | $ 221 |  |  |
accrued interest and penalties |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |
Unrecognized Tax Benefits, Decrease Resulting from Settlements with Taxing Authorities |  |  |  | $ 137 |  |

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