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Income Taxes - Schedule of Defered Income Taxes (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred Tax Assets Liabilities Net [Line Items] |  |  |
Inventory related |  | $ 212 | $ 144
Sales reserves and allowances |  | 173 | 198
Provision for legal settlements |  | 235 | 260
Intangible assets | [1] | (1,064) | (1,733)
Carryforward losses and deductions and credits | [2] | 2,176 | 1,689
Property, plant and equipment |  | (142) | (170)
Deferred interest |  | 527 | 648
Provisions for employee related obligations |  | 107 | 106
Other |  | 54 | 122
Long-term deferred tax assets (liabilities)-gross |  | 2,278 | 1,264
Valuation allowance—in respect of carryforward losses and deductions that may not be utilized |  | (2,547) | (1,974)
Deferred tax assets liabilities net |  | $ (269) | $ (710)
[1] | The decrease in deferred tax liability is mainly due to impairment and amortization.
[2] | The amounts are shown after reduction for unrecognized tax benefits of $ 63 million and $115 million as of December 31, 2020 and 2019, respectively. This amount represents the tax effect of gross carryforward losses and deductions with the following expirations: 2021-2022—$79 million; 2023-2029—$663 million; 2030 and thereafter—$171 million. The remaining balance—$1,327 million—can be utilized with no expiration date.

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