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Income Tax - Deferred Tax Assets and Liabilities (Detail) (USD $)
In Millions, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Tax loss carryforwards and investment credits $ 820 $ 643
Inventory valuation 24 23
Impairment and restructuring charges 61 56
Fixed asset depreciation in arrears 75 56
Receivables for government funding 15 13
Tax credits granted on past capital investments 1,114 1,111
Pension service costs 97 71
Stock awards   7
Commercial accruals 10 13
Other temporary differences 98 131
Total deferred tax assets 2,314 2,124
Valuation allowances (1,634) (1,514)
Deferred tax assets, net 680 610
Accelerated fixed asset depreciation (64) (69)
Acquired intangible assets (30) (49)
Advances of government funding (26) (16)
Other temporary differences (34) (38)
Deferred tax liabilities (154) (172)
Net deferred income tax asset $ 526 $ 438