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Income Tax - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Tax loss carryforwards and investment credits | $ 612 | $ 603
Less unrecognized tax benefit | (21) | (20)
Tax loss carryforwards net of unrecognized tax benefit | 591 | 583
Inventory valuation | 28 | 28
Impairment and restructuring charges | 6 | 14
Fixed asset depreciation in arrears | 39 | 35
Increased depreciation incentives | 213 | 211
Capitalized development costs | 118 | 108
Receivables for government funding | 14 | 11
Tax credits granted on past capital investments | 1,151 | 1,155
Pension service costs | 81 | 65
Stock awards | 6 | 7
Operating lease liabilities | 40 |
Commercial accruals | 15 | 12
Other temporary differences | 22 | 26
Total deferred tax assets | 2,324 | 2,255
Valuation allowances | (1,534) | (1,548)
Deferred tax assets, net | 790 | 707
Accelerated fixed asset depreciation | (20) | (16)
Acquired intangible assets | (16) | (13)
Advances of government funding | (31) | (12)
Operating lease right-of-use assets | (40) |
Other temporary differences | (7) | (7)
Deferred tax liabilities | (114) | (48)
Net deferred income tax asset | $ 676 | $ 659

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