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Income Taxes - Significant Components of Deferred Tax Assets and Liability (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Allowances and operating liabilities $ 355 $ 534
Net operating loss carryforwards 182 153
Postretirement benefits 31 60
Tax credit carryforwards 1,002 405
Other 78 164
Valuation allowance (1,202) (544)
Total deferred tax assets 446 772
Deferred tax liabilities:    
Tax over book depreciation 174 267
Intangible assets 716 1,148
Deferred income 111 185
Accrued tax on unremitted earnings 17 53
Other 92 97
Total deferred tax liabilities 1,110 1,750
Net deferred tax liability $ 664 $ 978