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INCOME TAXES - Deferred Tax Liabilities and Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]    
Fixed assets and capitalized software $ (4,782) $ (4,776)
Other (756) (699)
Deferred tax liabilities (5,538) (5,475)
Pension and postretirement benefits 4,236 3,915
Loss and credit carryforwards 229 261
Insurance reserves 733 730
Stock compensation 297 256
Other 681 650
Deferred tax assets 6,176 5,812
Deferred tax assets valuation allowance (159) (197)
Deferred tax asset (net of valuation allowance) 6,017 5,615
Net deferred tax asset 479 140
Amounts recognized in the consolidated balance sheets:    
Deferred tax assets 591 255
Deferred tax liabilities (112) (115)
Net deferred tax asset (liability) $ 479 $ 140