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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.