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)