Annual report pursuant to Section 13 and 15(d)

SHAREOWNERS' EQUITY SHAREOWNERS' EQUITY - Reclassification from AOCI (Details)

v3.20.4
SHAREOWNERS' EQUITY SHAREOWNERS' EQUITY - Reclassification from AOCI (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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 $ (1)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI for Sale of Securities, Net of Tax (4) (5) 3
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 (143) (123) 56
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, before Tax 45 39 (18)
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) (5,104) (1,988) (1,389)
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 (45) (39) 18
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 1,607 626 439
Net Income [Member] [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
TotalOtherComprehensiveIncomeReclassification, Net of Tax (4,957) (1,860) (1,448)
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 4 5 (3)
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 (143) (123) 56
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) (5,104) (1,988) (1,389)
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 5 6 (4)
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) 1
Investment income and other | 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 (227) (227) (201)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (6,484) (2,387) (1,627)
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 (8) (15) (24)
Foreign currency 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 $ 196 $ 177 $ (50)