POSTRETIREMENT BENEFIT PLANS - Schedule of Pre-tax Cost of Postretirement Benefit Plans and Changes in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plans | Principal Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Cost of postretirement benefit plans	$ (290)
Changes in other comprehensive loss (income):
Transfers from GE at Spin-Off	(1,989)
Plan amendments	53
Net loss (gain) – current year	606
Reclassifications out of AOCI:
Curtailment / settlement gain (loss)	(47)
Amortization of net loss (gain)	125
Amortization of prior service credit	(4)
Total changes in other comprehensive loss (income)	(1,256)
Cost (income) of postretirement benefit plans and changes in other comprehensive loss (income)	(1,546)
Pension Plans | Other Pension Plans
Defined Benefit Plan Disclosure [Line Items]
Cost of postretirement benefit plans	44	$ 9	$ 25
Changes in other comprehensive loss (income):
Transfers from GE at Spin-Off	740	0	0
Plan amendments	0	0	0
Net loss (gain) – current year	287	(74)	(86)
Reclassifications out of AOCI:
Curtailment / settlement gain (loss)	(61)	0	0
Amortization of net loss (gain)	(10)	(5)	(16)
Amortization of prior service credit	3	5	4
Total changes in other comprehensive loss (income)	959	(74)	(98)
Cost (income) of postretirement benefit plans and changes in other comprehensive loss (income)	1,003	$ (65)	(75)
Pension Plans | Other Pension Plans | Previously reported
Defined Benefit Plan Disclosure [Line Items]
Cost of postretirement benefit plans			$ 23
OPEB Plans
Defined Benefit Plan Disclosure [Line Items]
Cost of postretirement benefit plans	(86)
Changes in other comprehensive loss (income):
Transfers from GE at Spin-Off	(1,216)
Plan amendments	0
Net loss (gain) – current year	50
Reclassifications out of AOCI:
Curtailment / settlement gain (loss)	0
Amortization of net loss (gain)	64
Amortization of prior service credit	87
Total changes in other comprehensive loss (income)	(1,015)
Cost (income) of postretirement benefit plans and changes in other comprehensive loss (income)	$ (1,101)