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SHAREOWNERS' EQUITY - Gains (Losses) Reclassified from AOCI (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 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 | (21) | $ 10 | $ 2,467 | $ 13
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | 0 | (1) | 0 | (1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 1 | 2 | 4 | 2
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Income tax expense |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | 0 | (1) | 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 | 1 | 2 | 4 | 2
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 | 3 | 4 | 3
Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | (1) | (16) | (4) | (31)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | 3 | 52 | 13 | 98
Unrealized gain (loss) on cash flow hedges, net of tax: | Income tax expense |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | (1) | (16) | (4) | (31)
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 | 3 | 52 | 13 | 98
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) | (5) | (6)
Unrealized gain (loss) on cash flow hedges, net of tax: | Foreign currency exchange contracts | Revenue |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 7 | 71 | 22 | 135
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 | (25) | (44) |  |
Accumulated Defined Benefit Plans Adjustment [Member] | Income tax expense |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 8 | 13 | (772) | 27
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 | (25) | (44) | 2,450 | (87)
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 | (36) | (57) | (71) | (114)
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 | 69 | 0 | 69 | 0
Other Comprehensive Income (Loss), Defined Benefit Plan, Plan Amendments, Reclassification Adjustment from AOCI, before Tax | $ (66) | $ 0 | $ (66) | $ 0

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