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SHAREOWNERS' EQUITY SHAREOWNERS' EQUITY - Reclassification from AOCI (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Accumulated Translation Adjustment [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | $ (149) | $ 86 | $ (119)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | (1) | (1) | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | 3 | 1 | 0
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (56) | 5 | 236
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | (18) | 3 | 142
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification to earnings (net of tax effect of $67, $1,876 and $378) | 1,389 | 731 | 1,783
Tax | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | 18 | (3) | (142)
Tax | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, Tax | 439 | 269 | 1,040
Net Income [Member] [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
TotalOtherComprehensiveIncomeReclassification, Net of Tax | (1,448) | (727) | (1,547)
Net Income [Member] [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax | (3) | (1) | 0
Net Income [Member] [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | (56) | 5 | 236
Net Income [Member] [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Reclassification to earnings (net of tax effect of $67, $1,876 and $378) | (1,389) | (731) | (1,783)
Labor and Related Expense [Member] | Accumulated Defined Benefit Plans Adjustment [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax | (201) | (200) | (172)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax | (1,627) | (800) | (2,651)
Investment Income [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, before Tax | (4) | (2) | 0
Interest Expense [Member] | Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax | 1 | 1 | 0
Interest rate contracts | Interest Expense [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax | (24) | (27) | (26)
Foreign exchange contracts | Revenue [Member] | Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member] |  |  |
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax | $ 50 | $ (35) | $ (404)

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