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SHAREOWNERS' EQUITY Amounts Reclassified from AOCI (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Net Income [Member] [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
TotalOtherComprehensiveIncomeReclassification, Net of Tax | $ (58) | $ (31) | $ (134) | $ (52)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax |  |  | 1 | 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax |  |  | (1) | 0
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 | 0
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) | 0
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) | 0
Unrealized gain (loss) on cash flow hedges, net of tax: |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect |  |  | 18 | (7)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax |  |  | (56) | 11
Unrealized gain (loss) on cash flow hedges, net of tax: | Income Tax Expense Benefit [Member] |  |  |  |
AmountsReclassifiedFromAOCI [Line Items] |  |  |  |
Reclassification to earnings, tax effect | 6 | 0 | 18 | (7)
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 | (20) | 0 | (56) | 11
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) | (7) | (12) | (14)
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 | (20) | 7 | (62) | 32
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 |  |  | 77 | 63
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 | (50) | (50) | (101) | (100)
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 | 12 | 19 | 24 | 37
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 | $ (38) | $ (31) | $ (77) | $ (63)

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- Definition Amount, before tax, of reclassification adjustment from accumulated other comprehensive (income) loss for prior service cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e689-108580 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=84228862&loc=d3e637-108580 + Details
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