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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Income Tax Contingency [Line Items] |  |  |  |  |
Effective tax rate | 23.80% | 26.00% | 22.20% | 23.90% |
Provision for tax benefits related to settlement of employee awards |  |  | $ 59 | $ 56 |
Provision for income taxes | $ 209 | $ 215 | 665 | $ 765 |
Liability for unrecognized tax benefits | 523 |  | 523 |  | $ 550
Unrecognized tax benefits, accrued interest | 74 |  | 74 |  | 62
Unrecognized tax benefits that would impact effective tax rate | $ 167 |  | $ 167 |  | $ 160

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