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Income Taxes - Additional Information (Detail) - 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] |  |  |  |  |
Effective tax rate | 23.20% | 23.80% | 22.90% | 22.20% |
Provision for tax benefits related to settlement of employee awards |  |  | $ 96 | $ 59 |
Provision for income taxes | $ 685 | $ 209 | 1,531 | $ 665 |
Liability for unrecognized tax benefits | 626 |  | 626 |  | $ 508
Unrecognized tax benefits, accrued interest | 95 |  | 95 |  | 73
Unrecognized tax benefits that would impact effective tax rate | $ 192 |  | $ 192 |  | $ 157

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