Quarterly report pursuant to Section 13 or 15(d)

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

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SHAREOWNERS' EQUITY - Gains (Losses) Reclassified from AOCI (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other expenses $ (1,903) $ (1,909) $ (5,748) $ (5,531)
Investment income and other 124 333 424 981
Interest expense (199) (177) (578) (522)
Revenue 21,061 24,161 66,041 73,305
Income tax (expense) benefit (141) (685) (1,407) (2,263)
Net income 1,127 2,584 5,103 8,095
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net income 6 50 48 117
Foreign currency translation gain (loss) | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Other expenses     (3) 0
Income tax (expense) benefit     0 0
Net income     (3) 0
Unrealized gain (loss) on marketable securities | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Investment income and other 0 (1) (3) (1)
Income tax (expense) benefit 0 0 1 0
Net income 0 (1) (2) (1)
Unrealized gain (loss) on cash flow hedges | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense (6) (4) (9) (9)
Revenue 41 94 160 202
Income tax (expense) benefit (8) (21) (36) (46)
Net income 27 69 115 147
Unrecognized pension and postretirement benefit costs | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Income tax (expense) benefit 7 5 20 8
Net income (21) (18) (62) (29)
Prior service costs | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Investment income and other $ (28) $ (23) (82) (70)
Curtailment of benefit obligation | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Investment income and other     $ 0 $ 33