POSTRETIREMENT BENEFIT PLANS - Plan Funded Status (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2023
Change in plan assets
Funded status – surplus (deficit)				$ (4,045)
Pension Plans
Change in plan assets
Funded status – surplus (deficit)				(2,835)
Pension Plans | Principal Pension Plans
Change in projected benefit obligations
Balance at January 1	$ 0
Transfers from GE at Spin-Off	17,997
Service cost	32
Interest cost	952
Participant contributions	4
Plan amendments	53
Actuarial loss (gain) – net	493
Benefits paid	(1,341)
Curtailments	(30)
Exchange rate adjustments	0
Balance at December 31	18,160	$ 0
Change in plan assets
Balance at January 1	0
Transfers from GE at Spin-Off	14,838
Actual gain (loss) on plan assets	1,057
Employer contributions	142
Participant contributions	4
Benefits paid	(1,341)
Acquisitions/Divestitures/Mergers	0
Exchange rate adjustments	0
Balance at December 31	14,700	0
Funded status – surplus (deficit)	(3,460)
Pension Plans | Other Pension Plans
Change in projected benefit obligations
Balance at January 1	640
Transfers from GE at Spin-Off	3,707
Service cost	23	19	$ 24
Interest cost	209	17	15
Participant contributions	1
Plan amendments	2
Actuarial loss (gain) – net	221
Benefits paid	(359)
Curtailments	0
Exchange rate adjustments	144
Balance at December 31	4,588	640
Change in plan assets
Balance at January 1	382
Transfers from GE at Spin-Off	4,046
Actual gain (loss) on plan assets	189
Employer contributions	84
Participant contributions	1
Benefits paid	(359)
Acquisitions/Divestitures/Mergers	1
Exchange rate adjustments	174
Balance at December 31	4,518	382
Funded status – surplus (deficit)	(70)
Pension Plans | Other Pension Plans, under $20 Million Threshold
Change in projected benefit obligations
Balance at January 1	703	940
Transfers from GE at Spin-Off		0
Service cost		19
Interest cost		17
Participant contributions		1
Plan amendments		0
Actuarial loss (gain) – net		(193)
Benefits paid		(38)
Curtailments		0
Exchange rate adjustments		(43)
Balance at December 31		703	940
Change in plan assets
Balance at January 1	425	553
Transfers from GE at Spin-Off		0
Actual gain (loss) on plan assets		(101)
Employer contributions		18
Participant contributions		1
Benefits paid		(38)
Acquisitions/Divestitures/Mergers		0
Exchange rate adjustments		(8)
Balance at December 31		425	$ 553
Funded status – surplus (deficit)		(278)
OPEB Plans
Change in projected benefit obligations
Balance at January 1	0
Transfers from GE at Spin-Off	1,149
Service cost	6
Interest cost	59
Participant contributions	18
Plan amendments	0
Actuarial loss (gain) – net	50
Benefits paid	(149)
Curtailments	0
Exchange rate adjustments	0
Balance at December 31	1,133	0
Change in plan assets
Balance at January 1	0
Transfers from GE at Spin-Off	0
Actual gain (loss) on plan assets	0
Employer contributions	131
Participant contributions	18
Benefits paid	(149)
Acquisitions/Divestitures/Mergers	0
Exchange rate adjustments	0
Balance at December 31	0	$ 0
Funded status – surplus (deficit)	$ (1,133)			$ (1,210)