Quarterly report pursuant to Section 13 or 15(d)

SHAREOWNERS' EQUITY Amounts Reclassified from AOCI (Detail)

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SHAREOWNERS' EQUITY Amounts Reclassified from AOCI (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Net Income [Member] [Member]        
AmountsReclassifiedFromAOCI [Line Items]        
TotalOtherComprehensiveIncomeReclassification, Net of Tax $ (44) $ (32) $ (178) $ (84)
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     (2) 1
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 (1)   (2) 1
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) 1
Unrealized gain (loss) on cash flow hedges, net of tax:        
AmountsReclassifiedFromAOCI [Line Items]        
Reclassification to earnings, tax effect     19 (6)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax     (61) 9
Unrealized gain (loss) on cash flow hedges, net of tax: | Income Tax Expense Benefit [Member]        
AmountsReclassifiedFromAOCI [Line Items]        
Reclassification to earnings, tax effect 1 1 19 (6)
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 (5) (2) (61) 9
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) (6) (18) (20)
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 0 3 (62) 35
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     115 94
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) (151) (150)
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 36 56
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) $ (115) $ (94)