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Income Tax - Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Tax loss carryforwards and investment credits | $ 740 | $ 804
Less unrecognized tax benefit | (235) | (195)
Tax loss carryforwards net of unrecognized tax benefit | 505 | 609
Inventory valuation | 35 | 29
Impairment and restructuring charges | 16 | 20
Fixed asset depreciation in arrears | 32 | 34
Increased depreciation incentives | 118 |
Capitalized development costs | 101 | 91
Receivables for government funding | 6 | 7
Tax credits granted on past capital investments | 1,160 | 1,165
Pension service costs | 65 | 68
Stock awards | 5 |
Commercial accruals | 11 | 19
Other temporary differences | 99 | 92
Total deferred tax assets | 2,153 | 2,134
Valuation allowances | (1,502) | (1,577)
Deferred tax assets, net | 651 | 557
Accelerated fixed asset depreciation | (13) | (10)
Acquired intangible assets | (10) | (8)
Advances of government funding | (9) | (16)
Other temporary differences | (6) |
Deferred tax liabilities | (38) | (34)
Net deferred income tax asset | $ 613 | $ 523

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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