RETIREMENT BENEFITS - Funded Status and Accumulated Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Amounts recognized in AOCI
Sum of all settlements to trigger settlement accounting (percentage)	10.00%
U.S.
Change in plan assets
Plan assets at fair value at beginning of year	$ 10,441
Plan assets at fair value at year end	9,849	$ 10,441
Amounts recognized in AOCI
Net amount recognized in AOCI	12	13
U.S. | Pension Plans
Change in projected benefit obligation
Benefit obligation at beginning of year	9,640	9,741
Service cost	0	0	$ 0
Interest cost on benefit obligation	466	505	442
Plan amendments	0	0
Actuarial loss (gain)	(262)	282
Benefits paid, net of participants’ contributions	(888)	(888)
Divestitures	0	0
Settlement	0	0
Curtailment	0	0
Foreign exchange impact and other	0	0
Benefit obligation at year end	8,956	9,640	9,741
Change in plan assets
Plan assets at fair value at beginning of year	10,210	10,145
Actual return on assets	266	895
Company contributions, net of reimbursements	59	58
Benefits paid, net of participants’ contributions	(888)	(888)
Divestitures	0	0
Settlement	0	0
Foreign exchange impact and other	0	0
Plan assets at fair value at year end	9,647	10,210	10,145
Funded status of the plans at year end	691	570
Net amount recognized at year end
Net amount recognized on the balance sheet	691	570
Amounts recognized in AOCI
Prior service (cost) benefit	(3)	(5)
Net actuarial (loss) gain	(6,215)	(6,320)
Net amount recognized in AOCI	(6,218)	(6,325)
Accumulated benefit obligation at period end	8,956	9,640
U.S. | Postretirement Benefit Plans
Change in projected benefit obligation
Benefit obligation at beginning of year	343	375
Service cost	0	0	0
Interest cost on benefit obligation	16	18	16
Plan amendments	0	0
Actuarial loss (gain)	(21)	(1)
Benefits paid, net of participants’ contributions	(46)	(49)
Divestitures	0	0
Settlement	0	0
Curtailment	0	0
Foreign exchange impact and other	0	0
Benefit obligation at year end	292	343	375
Change in plan assets
Plan assets at fair value at beginning of year	231	253
Actual return on assets	9	19
Company contributions, net of reimbursements	8	8
Benefits paid, net of participants’ contributions	(46)	(49)
Divestitures	0	0
Settlement	0	0
Foreign exchange impact and other	0	0
Plan assets at fair value at year end	202	231	253
Funded status of the plans at year end	(90)	(112)
Net amount recognized at year end
Net amount recognized on the balance sheet	(90)	(112)
Amounts recognized in AOCI
Prior service (cost) benefit	63	73
Net actuarial (loss) gain	125	114
Net amount recognized in AOCI	188	187
Accumulated benefit obligation at period end	292	343
Non-U.S.
Change in plan assets
Plan assets at fair value at beginning of year	7,396
Plan assets at fair value at year end	7,013	7,396
Non-U.S. | Pension Plans
Change in projected benefit obligation
Benefit obligation at beginning of year	7,030	6,375
Service cost	115	115	116
Interest cost on benefit obligation	421	409	329
Plan amendments	(1)	(2)
Actuarial loss (gain)	(335)	273
Benefits paid, net of participants’ contributions	(394)	(368)
Divestitures	(1)	(77)
Settlement	(47)	(104)
Curtailment	(4)	(33)
Foreign exchange impact and other	(732)	442
Benefit obligation at year end	6,052	7,030	6,375
Change in plan assets
Plan assets at fair value at beginning of year	6,426	6,086
Actual return on assets	131	352
Company contributions, net of reimbursements	763	118
Benefits paid, net of participants’ contributions	(394)	(368)
Divestitures	(1)	(19)
Settlement	(47)	(104)
Foreign exchange impact and other	(620)	361
Plan assets at fair value at year end	6,258	6,426	6,086
Funded status of the plans at year end	206	(604)
Net amount recognized at year end
Net amount recognized on the balance sheet	206	(604)
Amounts recognized in AOCI
Prior service (cost) benefit	(1)	5
Net actuarial (loss) gain	(1,513)	(1,990)
Net amount recognized in AOCI	(1,514)	(1,985)
Accumulated benefit obligation at period end	5,716	6,686
Non-U.S. | Postretirement Benefit Plans
Change in projected benefit obligation
Benefit obligation at beginning of year	1,208	1,013
Service cost	1	1	2
Interest cost on benefit obligation	107	106	90
Plan amendments	0	0
Actuarial loss (gain)	(1)	27
Benefits paid, net of participants’ contributions	(96)	(77)
Divestitures	0	0
Settlement	0	0
Curtailment	0	0
Foreign exchange impact and other	(205)	138
Benefit obligation at year end	1,014	1,208	1,013
Change in plan assets
Plan assets at fair value at beginning of year	970	855
Actual return on assets	50	56
Company contributions, net of reimbursements	9	9
Benefits paid, net of participants’ contributions	(96)	(77)
Divestitures	0	0
Settlement	0	0
Foreign exchange impact and other	(178)	127
Plan assets at fair value at year end	755	970	$ 855
Funded status of the plans at year end	(259)	(238)
Net amount recognized at year end
Net amount recognized on the balance sheet	(259)	(238)
Amounts recognized in AOCI
Prior service (cost) benefit	21	33
Net actuarial (loss) gain	(263)	(311)
Net amount recognized in AOCI	(242)	(278)
Accumulated benefit obligation at period end	1,014	1,208
Qualified | U.S. | Pension Plans
Change in plan assets
Funded status of the plans at year end	1,181	1,107
Net amount recognized at year end
Benefit asset	1,181	1,107
Benefit liability	0	0
Net amount recognized on the balance sheet	1,181	1,107
Qualified | U.S. | Postretirement Benefit Plans
Change in plan assets
Funded status of the plans at year end	(90)	(112)
Net amount recognized at year end
Benefit asset	0	0
Benefit liability	(90)	(112)
Net amount recognized on the balance sheet	(90)	(112)
Qualified | Non-U.S. | Pension Plans
Change in plan assets
Funded status of the plans at year end	206	(604)
Net amount recognized at year end
Benefit asset	895	832
Benefit liability	(689)	(1,436)
Net amount recognized on the balance sheet	206	(604)
Qualified | Non-U.S. | Postretirement Benefit Plans
Change in plan assets
Funded status of the plans at year end	(259)	(238)
Net amount recognized at year end
Benefit asset	0	0
Benefit liability	(259)	(238)
Net amount recognized on the balance sheet	(259)	(238)
Nonqualified | U.S. | Pension Plans
Change in plan assets
Funded status of the plans at year end	(490)	(537)
Net amount recognized at year end
Net amount recognized on the balance sheet	(490)	(537)
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