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Income Taxes - Additional Information (Detail) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 18, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Tax Contingency [Line Items] |  |  |  |  |
Effective income tax rate |  | (7.40%) | 33.80% | 19.00% | 34.90%
Federal statutory income tax rate |  |  |  | 21.00% | 21.00%
Discrete tax benefit related to statue of limitations expiration |  | $ (87) |  | $ 15 |
Reduction in valuation allowance |  | 53 |  |  |
Tax expense, additional interest from uncertain tax positions |  | $ 47 |  | 8 | $ 13
Tax benefit due to prior period adjustments |  |  |  | 8 |
Tax expense related to change in status of certain entities |  |  |  | 27 |
Excess tax expense, share-based payment arrangement |  |  |  | 8 | 15
Tax due to adoption of CARES Act |  |  |  | 5 |
Tax benefits for impairment of intangible assets |  |  | $ 246 |  |
Tax benefit for expirations of uncertain tax positions |  |  | 74 |  |
Federal return to provision adjustments |  |  | $ 32 |  |
Tax benefit for state and local income tax adjustments |  |  |  |  | 10
Change in foreign tax status adjustment |  |  |  | $ 23 | 14
Swiss Federal Tax Administration |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |
Withholding tax refund |  |  |  |  | $ 13
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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