Quarterly report [Sections 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, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Interest expense $ (291) $ (230) $ (751) $ (637)
Revenue 21,415 22,245 64,182 65,769
Income tax expense (296) (371) (1,011) (1,254)
Net Income 1,311 1,539 3,781 4,061
Investment income and other 94 155 251 410
Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Net Income (44) (7) (60) (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 (1) (1) (4) (4)
Revenue (17) 30 44 118
Income tax expense 5 (7) (9) (27)
Net Income (14) 22 30 87
Investment income and other     (1) 0
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 9 9 28 27
Net Income (30) (29) (90) (88)
Prior service costs | Reclassification out of Accumulated Other Comprehensive Income        
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Investment income and other $ (39) $ (38) $ (118) $ (115)