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INCOME TAXES - Deferred Tax Liabilities and Assets (Detail) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Fixed assets and capitalized software | $ (3,288) | $ (4,782)
Other | (535) | (756)
Deferred tax liabilities | (3,823) | (5,538)
Pension and postretirement benefits | 1,877 | 4,236
Loss and credit carryforwards | 323 | 229
Insurance reserves | 449 | 733
Stock compensation | 182 | 297
Other | 626 | 681
Deferred tax assets | 3,457 | 6,176
Deferred tax assets valuation allowance | (126) | (159)
Deferred tax asset (net of valuation allowance) | 3,331 | 6,017
Net deferred tax asset (liability) | (492) | 479
Amounts recognized in the consolidated balance sheets: |  |
Deferred tax assets | 265 | 591
Deferred tax liabilities | (757) | (112)
Net deferred tax asset (liability) | $ (492) | $ 479

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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