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SHAREOWNERS' EQUITY - Gains (Losses) Reclassified from AOCI (Detail) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, before Tax |  | $ 66 |  |  |
Net income |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
TotalOtherComprehensiveIncomeReclassification, Net of Tax | $ (15) |  | $ (15) | $ 2,452 | $ (2)
Interest rate contracts | Investment income and other |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 0 |  | 0 | 0 | 0
Interest rate contracts | Interest expense |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | (3) |  | (3) | (8) | (9)
Interest rate contracts | Revenue |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 0 |  | 0 | 0 | 0
Foreign currency exchange contracts | Investment income and other |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 0 |  | 0 | 0 | 0
Foreign currency exchange contracts | Interest expense |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 0 |  | 0 | 0 | 0
Foreign currency exchange contracts | Revenue |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 22 |  | 38 | 44 | 173
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Reclassification to earnings, tax effect | 0 |  | 0 | 0 | (1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 |  | 1 | 4 | 3
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Income tax expense |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Reclassification to earnings, tax effect | 0 |  | 0 | 0 | (1)
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Net income |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 0 |  | 1 | 4 | 3
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 |  | 1 | 4 | 4
Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Reclassification to earnings, tax effect | (5) |  | (8) | (9) | (39)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 14 |  | 27 | 27 | 125
Unrealized gain (loss) on cash flow hedges, net of tax: | Income tax expense |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Reclassification to earnings, tax effect | (5) |  | (8) | (9) | (39)
Unrealized gain (loss) on cash flow hedges, net of tax: | Net income |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 14 |  | 27 | 27 | 125
Unrealized gain (loss) on cash flow hedges, net of tax: | Interest rate contracts | Interest expense |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | (3) |  | (3) | (8) | (9)
Unrealized gain (loss) on cash flow hedges, net of tax: | Foreign currency exchange contracts | Revenue |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Amount of gain or (loss) reclassified from accumulated other comprehensive income | 22 |  | 38 | 44 | 173
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 | (29) |  | (43) | (2,421) | 130
Accumulated Defined Benefit Plans Adjustment [Member] | Income tax expense |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 9 |  | 13 | (763) | 40
Accumulated Defined Benefit Plans Adjustment [Member] | Net income |  |  |  |  |
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 | (29) |  | (43) | 2,421 | (130)
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 | (38) |  | (56) | (109) | (170)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax |  |  |  | 3,290 | 0
Accumulated Defined Benefit Plans Adjustment [Member] | Other expenses |  |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | 0 |  | 0 | 69 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, before Tax | $ 0 |  | $ 0 | $ (66) | $ 0

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