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Income Taxes - Significant Components of Deferred Tax Assets and Liability (Detail) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Allowances and operating liabilities $ 293 $ 355
Net operating loss carryforwards 182 182
Postretirement benefits 30 31
Tax credit carryforwards 768 1,002
Other 95 78
Valuation allowance (955) (1,202)
Total deferred tax assets 413 446
Deferred tax liabilities:    
Tax over book depreciation 139 174
Intangible assets 688 716
Deferred income 70 111
Accrued tax on unremitted earnings 17 17
Other 52 92
Total deferred tax liabilities 966 1,110
Net deferred tax liability $ 553 $ 664