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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 18, 2019 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate |  | 11.60% | 7.40% | 18.50% | 19.00%
Federal statutory income tax rate |  |  |  | 21.00% | 21.00%
Reduction in valuation allowance |  | $ 37 | $ (53) | $ 13 |
Discrete tax benefit related to the statute of limitations |  |  | 87 | $ 9 | $ 15
Additional interest related to uncertain tax positions |  |  | $ 47 |  | 8
Tax benefit due to prior period adjustments |  |  |  |  | (8)
Change in foreign tax status adjustment |  |  |  |  | 23
Federal return to provision adjustments |  |  |  |  | 27
Excess tax expense, share-based payment arrangement |  |  |  |  | 8
Tax due to adoption of CARES Act |  |  |  |  | $ 5
Minimum | Internal Revenue Service | 2018 Tax Year |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax expense due to change in tax regulations | $ 180 |  |  |  |
Maximum | Internal Revenue Service | 2018 Tax Year |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Unrecognized income tax expense due to change in tax regulations | $ 220 |  |  |  |

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