RETIREMENT BENEFITS - Funded Status and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Change in projected benefit obligation
Actuarial loss	$ 1			$ 1	$ 2	$ 2
U.S. plans | Pension plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year			$ 9,640		9,640
Plans measured annually
Service cost	0			0	0	0
Interest cost on benefit obligation	119			124	355	374
Change in plan assets
Plan assets at fair value at beginning of year			10,210		10,210
Net amount recognized at period end
Benefit asset	1,126				1,126
Benefit liability	(502)				(502)
Net amount recognized on the balance sheet—Significant Plans	624				624
Amounts recognized in AOCI at period end(3)
Prior service (expense) benefit	0				0
Net actuarial (loss) gain	(6,287)				(6,287)
Net amount recognized in equity-pretax	(6,287)				(6,287)
Accumulated benefit obligation at period end—Significant Plans	9,423				9,423
U.S. plans | Pension plans | Other than Significant Plans Measured Annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year			18		18
Plans measured annually
Change in plan assets
Plan assets at fair value at beginning of year			0		0
U.S. plans | Pension plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	9,147		9,622		9,622
Plans measured annually	(9,446)	$ (9,147)			(9,446)
Service cost	0
Interest cost on benefit obligation	120
Actuarial loss	403
Benefits paid, net of participants’ contributions	(224)
Foreign exchange impact	0
Projected benefit obligation at period end—Significant Plans	9,446	9,147			9,446
Quarter activity		(231)	(244)
Change in plan assets
Plan assets at fair value at beginning of year	9,806		10,210		10,210
Actual return on plan assets	474
Company contributions, net of reimbursements	14
Benefits paid, net of participants’ contributions	(224)
Foreign exchange impact	0
Plan assets at fair value at period end—Significant Plans	10,070	9,806			10,070
Quarterly activity		(203)	(201)
Funded status of the Significant Plans	624				624
U.S. plans | Postretirement benefit plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year			343		343
Plans measured annually
Service cost	0			0	0	0
Interest cost on benefit obligation	4			4	12	13
Change in plan assets
Plan assets at fair value at beginning of year			231		231
Net amount recognized at period end
Benefit asset	0				0
Benefit liability	(110)				(110)
Net amount recognized on the balance sheet—Significant Plans	(110)				(110)
Amounts recognized in AOCI at period end(3)
Prior service (expense) benefit	66				66
Net actuarial (loss) gain	105				105
Net amount recognized in equity-pretax	171				171
Accumulated benefit obligation at period end—Significant Plans	325				325
U.S. plans | Postretirement benefit plans | Other than Significant Plans Measured Annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year			0		0
Plans measured annually
Change in plan assets
Plan assets at fair value at beginning of year			0		0
U.S. plans | Postretirement benefit plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	320		343		343
Plans measured annually	(325)	(320)			(325)
Service cost	0
Interest cost on benefit obligation	4
Actuarial loss	10
Benefits paid, net of participants’ contributions	(9)
Foreign exchange impact	0
Projected benefit obligation at period end—Significant Plans	325	320			325
Quarter activity		(11)	(12)
Change in plan assets
Plan assets at fair value at beginning of year	217		231		231
Actual return on plan assets	9
Company contributions, net of reimbursements	(2)
Benefits paid, net of participants’ contributions	(9)
Foreign exchange impact	0
Plan assets at fair value at period end—Significant Plans	215	217			215
Quarterly activity		(14)	0
Funded status of the Significant Plans	(110)				(110)
Non-U.S. plans | Pension plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year			7,030		7,030
Plans measured annually
Service cost	28			29	87	87
Interest cost on benefit obligation	105			105	323	305
Change in plan assets
Plan assets at fair value at beginning of year			6,426		6,426
Net amount recognized at period end
Benefit asset	797				797
Benefit liability	(762)				(762)
Net amount recognized on the balance sheet—Significant Plans	35				35
Amounts recognized in AOCI at period end(3)
Prior service (expense) benefit	(8)				(8)
Net actuarial (loss) gain	(1,366)				(1,366)
Net amount recognized in equity-pretax	(1,374)				(1,374)
Accumulated benefit obligation at period end—Significant Plans	4,662				4,662
Non-U.S. plans | Pension plans | Other than Significant Plans Measured Annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year			1,663		1,663
Plans measured annually
Change in plan assets
Plan assets at fair value at beginning of year			(1,198)		(1,198)
Non-U.S. plans | Pension plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	4,915		5,367		5,367
Plans measured annually	(4,871)	(4,915)			(4,871)
Service cost	11
Interest cost on benefit obligation	86
Actuarial loss	33
Benefits paid, net of participants’ contributions	(84)
Foreign exchange impact	(90)
Projected benefit obligation at period end—Significant Plans	4,871	4,915			4,871
Quarter activity		(376)	(76)
Change in plan assets
Plan assets at fair value at beginning of year	4,841		5,228		5,228
Actual return on plan assets	160
Company contributions, net of reimbursements	5
Benefits paid, net of participants’ contributions	(84)
Foreign exchange impact	(16)
Plan assets at fair value at period end—Significant Plans	4,906	4,841			4,906
Quarterly activity		(275)	(112)
Funded status of the Significant Plans	35				35
Non-U.S. plans | Postretirement benefit plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year			1,208		1,208
Plans measured annually
Service cost	0			0	1	1
Interest cost on benefit obligation	25			$ 27	82	$ 79
Change in plan assets
Plan assets at fair value at beginning of year			970		970
Net amount recognized at period end
Benefit asset	21				21
Benefit liability	0				0
Net amount recognized on the balance sheet—Significant Plans	21				21
Amounts recognized in AOCI at period end(3)
Prior service (expense) benefit	24				24
Net actuarial (loss) gain	(221)				(221)
Net amount recognized in equity-pretax	(197)				(197)
Accumulated benefit obligation at period end—Significant Plans	822				822
Non-U.S. plans | Postretirement benefit plans | Other than Significant Plans Measured Annually
Change in projected benefit obligation
Projected benefit obligation at beginning of year			219		219
Plans measured annually
Change in plan assets
Plan assets at fair value at beginning of year			(9)		(9)
Non-U.S. plans | Postretirement benefit plans | Significant Plans Measured Quarterly
Change in projected benefit obligation
Projected benefit obligation at beginning of year	870		989		989
Plans measured annually	(822)	(870)			(822)
Service cost	0
Interest cost on benefit obligation	22
Actuarial loss	14
Benefits paid, net of participants’ contributions	(22)
Foreign exchange impact	(62)
Projected benefit obligation at period end—Significant Plans	822	870			822
Quarter activity		(116)	(3)
Change in plan assets
Plan assets at fair value at beginning of year	865		961		961
Actual return on plan assets	63
Company contributions, net of reimbursements	0
Benefits paid, net of participants’ contributions	(22)
Foreign exchange impact	(63)
Plan assets at fair value at period end—Significant Plans	843	865			843
Quarterly activity		$ (88)	$ (8)
Funded status of the Significant Plans	21				21
Qualified plans | U.S. plans | Pension plans | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the Significant Plans	1,126				1,126
Qualified plans | U.S. plans | Postretirement benefit plans | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the Significant Plans	(110)				(110)
Qualified plans | Non-U.S. plans | Pension plans | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the Significant Plans	35				35
Qualified plans | Non-U.S. plans | Postretirement benefit plans | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the Significant Plans	21				21
Nonqualified plans | U.S. plans | Pension plans | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the Significant Plans	(502)				(502)
Nonqualified plans | U.S. plans | Postretirement benefit plans | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the Significant Plans	0				0
Nonqualified plans | Non-U.S. plans | Pension plans | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the Significant Plans	0				0
Nonqualified plans | Non-U.S. plans | Postretirement benefit plans | Significant Plans Measured Quarterly
Change in plan assets
Funded status of the Significant Plans	$ 0				$ 0