RETIREMENT BENEFITS - Funded Status and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
U.S.
Change in plan assets
Plan assets at fair value at beginning of year	$ 13,296
Plan assets at fair value at year end	10,398	$ 13,296
Amounts recognized in AOCI
Net amount recognized in equity (pretax)	16	15
U.S. | Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	12,766	13,815
Service cost	0	0	$ 0
Interest cost on benefit obligation	442	351	378
Plan amendments	0	0
Actuarial (gain)	(2,522)	(447)
Benefits paid, net of participants’ contributions	(945)	(953)
Divestitures	0	0
Settlement	0	0
Curtailment	0	0
Foreign exchange impact and other	0	0
Projected benefit obligation at period end	9,741	12,766	13,815
Change in plan assets
Plan assets at fair value at beginning of year	12,977	13,309
Actual return on assets	(1,942)	565
Company contributions, net of reimbursements	55	56
Benefits paid, net of participants’ contributions	(945)	(953)
Divestitures	0	0
Settlement	0	0
Foreign exchange impact and other	0	0
Plan assets at fair value at year end	10,145	12,977	13,309
Funded status of the plans at year end	404	211
Net amount recognized at year end
Net amount recognized on the balance sheet	404	211
Amounts recognized in AOCI
Net transition obligation	0	0
Prior service (cost) benefit	(6)	(8)
Net actuarial (loss) gain	(6,445)	(6,575)
Net amount recognized in equity (pretax)	(6,451)	(6,583)
Accumulated benefit obligation at period end	9,740	12,765
U.S. | Postretirement Benefit Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	501	559
Service cost	0	0	0
Interest cost on benefit obligation	16	13	17
Plan amendments	0	0
Actuarial (gain)	(95)	(28)
Benefits paid, net of participants’ contributions	(47)	(43)
Divestitures	0	0
Settlement	0	0
Curtailment	0	0
Foreign exchange impact and other	0	0
Projected benefit obligation at period end	375	501	559
Change in plan assets
Plan assets at fair value at beginning of year	319	331
Actual return on assets	(33)	9
Company contributions, net of reimbursements	14	22
Benefits paid, net of participants’ contributions	(47)	(43)
Divestitures	0	0
Settlement	0	0
Foreign exchange impact and other	0	0
Plan assets at fair value at year end	253	319	331
Funded status of the plans at year end	(122)	(182)
Net amount recognized at year end
Net amount recognized on the balance sheet	(122)	(182)
Amounts recognized in AOCI
Net transition obligation	0	0
Prior service (cost) benefit	82	92
Net actuarial (loss) gain	120	77
Net amount recognized in equity (pretax)	202	169
Accumulated benefit obligation at period end	375	501
Non-U.S.
Change in plan assets
Plan assets at fair value at beginning of year	8,657
Plan assets at fair value at year end	6,941	8,657
Non-U.S. | Pension Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	8,001	8,629
Service cost	116	149	147
Interest cost on benefit obligation	329	268	246
Plan amendments	0	6
Actuarial (gain)	(1,168)	(344)
Benefits paid, net of participants’ contributions	(397)	(345)
Divestitures	(22)	0
Settlement	(364)	(124)
Curtailment	(35)	(30)
Foreign exchange impact and other	(85)	(208)
Projected benefit obligation at period end	6,375	8,001	8,629
Change in plan assets
Plan assets at fair value at beginning of year	7,614	7,831
Actual return on assets	(1,212)	217
Company contributions, net of reimbursements	495	155
Benefits paid, net of participants’ contributions	(397)	(345)
Divestitures	(11)	0
Settlement	(364)	(124)
Foreign exchange impact and other	(39)	(120)
Plan assets at fair value at year end	6,086	7,614	7,831
Funded status of the plans at year end	(289)	(387)
Net amount recognized at year end
Net amount recognized on the balance sheet	(289)	(387)
Amounts recognized in AOCI
Net transition obligation	0	0
Prior service (cost) benefit	7	5
Net actuarial (loss) gain	(1,671)	(1,400)
Net amount recognized in equity (pretax)	(1,664)	(1,395)
Accumulated benefit obligation at period end	6,051	7,559
Non-U.S. | Postretirement Benefit Plans
Change in projected benefit obligation
Projected benefit obligation at beginning of year	1,169	1,390
Service cost	2	6	7
Interest cost on benefit obligation	90	96	93
Plan amendments	0	0
Actuarial (gain)	(100)	(110)
Benefits paid, net of participants’ contributions	(72)	(78)
Divestitures	0	0
Settlement	0	0
Curtailment	0	0
Foreign exchange impact and other	(76)	(135)
Projected benefit obligation at period end	1,013	1,169	1,390
Change in plan assets
Plan assets at fair value at beginning of year	1,043	1,146
Actual return on assets	(75)	97
Company contributions, net of reimbursements	9	8
Benefits paid, net of participants’ contributions	(72)	(78)
Divestitures	0	0
Settlement	0	0
Foreign exchange impact and other	(50)	(130)
Plan assets at fair value at year end	855	1,043	$ 1,146
Funded status of the plans at year end	(158)	(126)
Net amount recognized at year end
Net amount recognized on the balance sheet	(158)	(126)
Amounts recognized in AOCI
Net transition obligation	0	0
Prior service (cost) benefit	36	47
Net actuarial (loss) gain	(206)	(182)
Net amount recognized in equity (pretax)	(170)	(135)
Accumulated benefit obligation at period end	1,013	1,169
Qualified | U.S. | Pension Plans
Change in plan assets
Funded status of the plans at year end	949	894
Net amount recognized at year end
Benefit asset	949	894
Benefit liability	0	0
Net amount recognized on the balance sheet	949	894
Qualified | U.S. | Postretirement Benefit Plans
Change in plan assets
Funded status of the plans at year end	(122)	(182)
Net amount recognized at year end
Benefit asset	0	0
Benefit liability	(122)	(182)
Net amount recognized on the balance sheet	(122)	(182)
Qualified | Non-U.S. | Pension Plans
Change in plan assets
Funded status of the plans at year end	(289)	(387)
Net amount recognized at year end
Benefit asset	799	963
Benefit liability	(1,088)	(1,350)
Net amount recognized on the balance sheet	(289)	(387)
Qualified | Non-U.S. | Postretirement Benefit Plans
Change in plan assets
Funded status of the plans at year end	(158)	(126)
Net amount recognized at year end
Benefit asset	28	165
Benefit liability	(186)	(291)
Net amount recognized on the balance sheet	(158)	(126)
Nonqualified | U.S. | Pension Plans
Change in plan assets
Funded status of the plans at year end	(545)	(683)
Net amount recognized at year end
Net amount recognized on the balance sheet	(545)	(683)
Nonqualified | U.S. | Postretirement Benefit Plans
Change in plan assets
Funded status of the plans at year end	0	0
Net amount recognized at year end
Net amount recognized on the balance sheet	0	0
Nonqualified | Non-U.S. | Pension Plans
Change in plan assets
Funded status of the plans at year end	0	0
Net amount recognized at year end
Net amount recognized on the balance sheet	0	0
Nonqualified | Non-U.S. | Postretirement Benefit Plans
Change in plan assets
Funded status of the plans at year end	0	0
Net amount recognized at year end
Net amount recognized on the balance sheet	$ 0	$ 0