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SHAREOWNERS' EQUITY - Gains (Losses) Reclassified from AOCI (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Net Income [Member] [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
TotalOtherComprehensiveIncomeReclassification, Net of Tax | $ (15) | $ 7 | $ (2) | $ (39)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | 0 | (1) | (1) | (1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 1 | 5 | 3 | 5
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Income Tax Expense Benefit [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | 0 | (1) | (1) | (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 | 1 | 5 | 3 | 5
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 | 1 | 6 | 4 | 6
Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | (8) | (14) | (39) | (27)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 27 | 45 | 125 | 85
Unrealized gain (loss) on cash flow hedges, net of tax: | Income Tax Expense Benefit [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | (8) | (14) | (39) | (27)
Unrealized gain (loss) on cash flow hedges, net of tax: | Net Income [Member] [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 27 | 45 | 125 | 85
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 | (3) | (3) | (9) | (12)
Unrealized gain (loss) on cash flow hedges, net of tax: | Foreign exchange contracts | Revenue |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 38 | 62 | 173 | 124
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 | 14 | 40 | 41
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) | (43) | (130) | (129)
Accumulated Defined Benefit Plans Adjustment [Member] | Investment Income and Other |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | $ (56) | $ (57) | $ (170) | $ (170)

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