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Income Tax - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
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Income Tax Disclosure [Abstract] |  |
Tax loss carryforwards and investment credits | $ 603 | $ 740
Less unrecognized tax benefit | (20) | (235)
Tax loss carryforwards net of unrecognized tax benefit | 583 | 505
Inventory valuation | 28 | 35
Impairment and restructuring charges | 14 | 16
Fixed asset depreciation in arrears | 35 | 32
Increased depreciation incentives | 211 | 118
Capitalized development costs | 108 | 101
Receivables for government funding | 11 | 6
Tax credits granted on past capital investments | 1,155 | 1,160
Pension service costs | 65 | 65
Stock awards | 7 | 5
Commercial accruals | 12 | 11
Other temporary differences | 26 | 99
Total deferred tax assets | 2,255 | 2,153
Valuation allowances | (1,548) | (1,502)
Deferred tax assets, net | 707 | 651
Accelerated fixed asset depreciation | (16) | (13)
Acquired intangible assets | (13) | (10)
Advances of government funding | (12) | (9)
Other temporary differences | (7) | (6)
Deferred tax liabilities | (48) | (38)
Net deferred income tax asset | $ 659 | $ 613

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