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SHAREOWNERS' EQUITY Amounts Reclassified from AOCI (Detail) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Net Income [Member] [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
TotalOtherComprehensiveIncomeReclassification, Net of Tax | $ (30) | $ (76)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 | 1
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 | (1)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Income Tax Expense Benefit [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 0 | 1
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Net Income [Member] [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 | (1)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Investment income and other |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | 0 | (2)
Unrealized gain (loss) on cash flow hedges, net of tax: |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Reclassification to earnings, tax effect | (13) | 36
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax | 13 | (36)
Unrealized gain (loss) on cash flow hedges, net of tax: | Income Tax Expense Benefit [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Reclassification to earnings, tax effect | (4) | 12
Unrealized gain (loss) on cash flow hedges, net of tax: | Net Income [Member] [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax | 13 | (36)
Unrealized gain (loss) on cash flow hedges, net of tax: | Interest rate contracts | Interest Expense |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | (6) | (6)
Unrealized gain (loss) on cash flow hedges, net of tax: | Foreign exchange contracts | Interest Expense |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 23 | (42)
Accumulated Defined Benefit Plans Adjustment [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | 0 | (609)
Accumulated Defined Benefit Plans Adjustment [Member] | Labor and Related Expense [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (56) | (51)
Accumulated Defined Benefit Plans Adjustment [Member] | Income Tax Expense Benefit [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 13 | 12
Accumulated Defined Benefit Plans Adjustment [Member] | Net Income [Member] [Member] |  |
AmountsReclassifiedFromAOCI [Line Items] |  |
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax | $ (43) | $ (39)

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