Quarterly report pursuant to Section 13 or 15(d)

SHAREOWNERS' EQUITY - Gains (Losses) Reclassified from AOCI (Detail)

v3.21.1
SHAREOWNERS' EQUITY - Gains (Losses) Reclassified from AOCI (Detail) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Net Income [Member] [Member]    
AmountsReclassifiedFromAOCI [Line Items]    
TotalOtherComprehensiveIncomeReclassification, Net of Tax $ 2,488 $ 3
Accumulated Net Unrealized Investment Gain (Loss) [Member]    
AmountsReclassifiedFromAOCI [Line Items]    
Reclassification to earnings, tax effect 0 0
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax 3 0
Accumulated Net Unrealized Investment Gain (Loss) [Member] | Income Tax Expense Benefit [Member]    
AmountsReclassifiedFromAOCI [Line Items]    
Reclassification to earnings, tax effect 0 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 3 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 3 0
Unrealized gain (loss) on cash flow hedges, net of tax:    
AmountsReclassifiedFromAOCI [Line Items]    
Reclassification to earnings, tax effect (3) (15)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 10 46
Unrealized gain (loss) on cash flow hedges, net of tax: | Income Tax Expense Benefit [Member]    
AmountsReclassifiedFromAOCI [Line Items]    
Reclassification to earnings, tax effect (3) (15)
Unrealized gain (loss) on cash flow hedges, net of tax: | Net Income [Member] [Member]    
AmountsReclassifiedFromAOCI [Line Items]    
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax 10 46
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 (2) (3)
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 15 64
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 2,475 (43)
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 (780) 14
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 2,475 (43)
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 (35) (57)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax $ 3,290 $ 0