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
Mar. 31, 2018
Mar. 31, 2017
Net Income [Member] [Member]    
AmountsReclassifiedFromAOCI [Line Items]    
TotalOtherComprehensiveIncomeReclassification, Net of Tax $ (76) $ (21)
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
AmountsReclassifiedFromAOCI [Line Items]    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Tax 0 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 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 (2) 0
Unrealized gain (loss) on cash flow hedges, net of tax:    
AmountsReclassifiedFromAOCI [Line Items]    
Reclassification to earnings, tax effect 12 (7)
Other Comprehensive Income (Loss), Reclassification Adjustment on Derivatives Included in Net Income, Net of Tax (36) 11
Unrealized gain (loss) on cash flow hedges, net of tax: | Income Tax Expense Benefit [Member]    
AmountsReclassifiedFromAOCI [Line Items]    
Reclassification to earnings, tax effect 12 (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 (36) 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)
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 (42) 25
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 39 32
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 (51) (50)
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 18
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 $ (39) $ (32)