PENSION AND OTHER POSTRETIREMENT BENEFITS - Balance Sheet Impact (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Change in plan assets:
Postretirement benefit obligations other than pensions	$ (146)	$ (208)
Pension ongoing income—non-service | U.S. Plans
Change in benefit obligation:
Benefit obligation at beginning of year	17,391	18,054
Service cost	86	105	$ 99
Interest cost	380	306	461
Plan amendments	0	0
Actuarial (gains) losses	(3,135)	141
Benefits paid	(1,421)	(1,221)
Settlements and curtailments	(13)	0
Foreign currency translation	0	0
Other	2	6
Benefit obligation at end of year	13,290	17,391	18,054
Change in plan assets:
Fair value of plan assets at beginning of year	20,560	20,396
Actual return on plan assets	(2,161)	1,344
Company contributions	37	35
Benefits paid	1,421	1,221
Settlements and curtailments	(13)	0
Foreign currency translation	0	0
Other	3	6
Fair value of plan assets at end of year	17,005	20,560	20,396
Funded status of plans	3,715	3,169
Prepaid pension benefit cost	3,970	3,528
Accrued pension liabilities - current	(28)	(33)
Accrued pension liabilities - noncurrent	(227)	(326)
Net amount recognized	3,715	3,169
Pension ongoing income—non-service | Non-U.S. Plans
Change in benefit obligation:
Benefit obligation at beginning of year	6,999	7,670
Service cost	19	26	23
Interest cost	103	77	106
Plan amendments	0	(3)
Actuarial (gains) losses	(1,929)	(403)
Benefits paid	(261)	(249)
Settlements and curtailments	0	0
Foreign currency translation	(533)	(121)
Other	2	2
Benefit obligation at end of year	4,400	6,999	7,670
Change in plan assets:
Fair value of plan assets at beginning of year	8,396	8,450
Actual return on plan assets	(2,187)	166
Company contributions	17	101
Benefits paid	261	249
Settlements and curtailments	0	0
Foreign currency translation	(664)	(74)
Other	3	2
Fair value of plan assets at end of year	5,304	8,396	8,450
Funded status of plans	904	1,397
Prepaid pension benefit cost	1,356	2,105
Accrued pension liabilities - current	(14)	(14)
Accrued pension liabilities - noncurrent	(438)	(694)
Net amount recognized	904	1,397
Other Postretirement Benefits
Change in benefit obligation:
Benefit obligation at beginning of year	196	229
Service cost	0	0	0
Interest cost	5	5	8
Plan amendments	0	0
Actuarial (gains) losses	(54)	(8)
Benefits paid	(14)	(30)
Benefit obligation at end of year	133	196	229
Change in plan assets:
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Company contributions	0	0
Benefits paid	0	0
Fair value of plan assets at end of year	0	0	$ 0
Funded status of plans	(133)	(196)
Accrued pension liabilities - current	(21)	(25)
Postretirement benefit obligations other than pensions	(112)	(171)
Net amount recognized	(133)	(196)
Foreign plans excluded from postretirement benefits other than pensions	$ 34	$ 37