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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Dec. 31, 2022 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2019 | Sep. 30, 2022 | Sep. 30, 2021
Income Tax Examination [Line Items] |  |  |  |  |  |
Income tax expense (benefit) rate |  | 31.00% | 18.70% |  | 52.60% | (25.30%)
IRS |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Possible increase in U.S. taxable income |  |  |  | $ 696 |  |
Possible additional federal tax expense |  |  |  | $ 244 |  |
IRS | Subsequent Event |  |  |  |  |  |
Income Tax Examination [Line Items] |  |  |  |  |  |
Possible increase in U.S. taxable income | $ 1,413 |  |  |  |  |
Possible additional federal tax expense | $ 494 |  |  |  |  |

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