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Income Tax - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
Tax loss carryforwards and investment credits | $ 702 | $ 612
Less unrecognized tax benefit | (19) | (21)
Tax loss carryforwards net of unrecognized tax benefit | 683 | 591
Inventory valuation | 34 | 28
Impairment and restructuring charges | 3 | 6
Fixed asset depreciation in arrears | 82 | 39
Increased depreciation incentives | 182 | 213
Capitalized development costs | 107 | 118
Receivables for government funding | 40 | 14
Tax credits granted on past capital investments | 215 | 1,151
Pension service costs | 104 | 81
Stock awards | 11 | 6
Operating lease liabilities | 36 | 40
Commercial accruals | 13 | 15
Other temporary differences | 26 | 22
Total deferred tax assets | 1,536 | 2,324
Valuation allowances | (638) | (1,534)
Deferred tax assets, net | 898 | 790
Accelerated fixed asset depreciation | (21) | (20)
Acquired intangible assets | (40) | (16)
Advances of government funding | (94) | (31)
Operating lease right-of-use assets | (36) | (40)
Other temporary differences | (43) | (7)
Deferred tax liabilities | (234) | (114)
Net deferred income tax asset | $ 664 | $ 676

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