POSTRETIREMENT BENEFIT PLANS - Plan Funded Status and Amounts Recorded in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Change in benefit obligations
Balance at January 1	$ 70,811
Balance at December 31	48,649	$ 70,811
Change in plan assets
Balance at January 1	59,666
Balance at December 31	40,516	59,666
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total	(8,133)	(11,145)
Amounts recorded in Statement of Financial Position
Non-current assets - other	1,468	1,793
Continuing operations
Change in benefit obligations
Balance at January 1	47,298
Balance at December 31	48,649	47,298
Change in plan assets
Balance at January 1	40,375
Balance at December 31	40,516	40,375
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total	(8,133)	(6,923)
Continuing operations | Held for sale, not discontinued operation | Steam business
Amounts recorded in Statement of Financial Position
Non-current liabilities - compensation and benefits	(37)	(35)
Discontinued operations
Change in benefit obligations
Balance at January 1	23,513
Balance at December 31	0	23,513
Change in plan assets
Balance at January 1	19,291
Balance at December 31	0	19,291
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total	0	(4,222)
Principal pension
Change in benefit obligations
Balance at January 1	53,591	72,299
Service cost for benefits earned	94	221	$ 237
Interest cost on benefit obligations	1,892	2,069	1,951
Participant contributions	10	14
Plan amendments	49	0
Actuarial loss (gain) - net	1,081	(17,281)
Benefits paid	(2,503)	(3,731)
Dispositions/acquisitions/other - net	(17,997)	0
Exchange rate adjustments	0	0
Balance at December 31	36,217	53,591	72,299
Change in plan assets
Balance at January 1	44,993	60,990
Actual gain (loss) on plan assets	1,869	(12,605)
Employer contributions	212	325
Participant contributions	10	14
Benefits paid	(2,503)	(3,731)
Dispositions/acquisitions/other - net	(14,837)	0
Exchange rate adjustments	0	0
Balance at December 31	29,744	44,993	60,990
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total	(6,473)	(8,598)
Amounts recorded in Statement of Financial Position
Net amount recorded	(6,473)	(8,598)
Prior service cost (credit)	(25)	(113)
Net loss (gain)	(1,454)	(5,710)
Total recorded in Accumulated other comprehensive loss (income)	(1,479)	(5,823)
Principal pension | Continuing operations
Change in plan assets
Balance at January 1	30,133
Balance at December 31	29,744	30,133
Amounts recorded in Statement of Financial Position
Non-current assets - other	0	0
Current liabilities - other	(224)	(214)
Non-current liabilities - compensation and benefits	(6,249)	(5,243)
Principal pension | Discontinued operations
Change in plan assets
Balance at January 1	14,860
Balance at December 31	0	14,860
Amounts recorded in Statement of Financial Position
Non-current assets - other	0	0
Current and non-current liabilities	0	(3,141)
Principal pension | GE pension plan
Change in benefit obligations
Balance at December 31	3,541
Principal pension | GE supplementary pension plan
Change in benefit obligations
Balance at January 1	5,457
Balance at December 31		5,457
Other pension
Change in benefit obligations
Balance at January 1	13,916	22,256
Service cost for benefits earned	37	86	233
Interest cost on benefit obligations	422	398	383
Participant contributions	19	19
Plan amendments	0	0
Actuarial loss (gain) - net	526	(6,282)
Benefits paid	(618)	(920)
Dispositions/acquisitions/other - net	(4,387)	0
Exchange rate adjustments	462	(1,641)
Balance at December 31	10,377	13,916	22,256
Change in plan assets
Balance at January 1	14,663	22,490
Actual gain (loss) on plan assets	442	(5,334)
Employer contributions	161	209
Participant contributions	19	19
Benefits paid	(618)	(920)
Dispositions/acquisitions/other - net	(4,439)	0
Exchange rate adjustments	536	(1,801)
Balance at December 31	10,764	14,663	22,490
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total	387	747
Amounts recorded in Statement of Financial Position
Net amount recorded	387	747
Prior service cost (credit)	(16)	(42)
Net loss (gain)	1,680	1,787
Total recorded in Accumulated other comprehensive loss (income)	1,664	1,745
Other pension | Continuing operations
Change in plan assets
Balance at January 1	10,232
Balance at December 31	10,764	10,232
Amounts recorded in Statement of Financial Position
Non-current assets - other	1,489	1,747
Current liabilities - other	(54)	(55)
Non-current liabilities - compensation and benefits	(1,048)	(1,013)
Other pension | Discontinued operations
Change in plan assets
Balance at January 1	4,431
Balance at December 31	0	4,431
Amounts recorded in Statement of Financial Position
Non-current assets - other	0	844
Current and non-current liabilities	0	(776)
Principal retiree benefit
Change in benefit obligations
Balance at January 1	3,304	4,308
Service cost for benefits earned	17	39	44
Interest cost on benefit obligations	111	108	103
Participant contributions	31	54
Plan amendments	0	0
Actuarial loss (gain) - net	(5)	(778)
Benefits paid	(254)	(438)
Dispositions/acquisitions/other - net	(1,149)	11
Exchange rate adjustments	0	0
Balance at December 31	2,055	3,304	4,308
Change in plan assets
Balance at January 1	10	42
Actual gain (loss) on plan assets	0	0
Employer contributions	221	352
Participant contributions	31	54
Benefits paid	(254)	(438)
Dispositions/acquisitions/other - net	0	0
Exchange rate adjustments	0	0
Balance at December 31	8	10	$ 42
Defined Benefit Plan, Funded (Unfunded) Status of Plan, Total	(2,047)	(3,294)
Amounts recorded in Statement of Financial Position
Net amount recorded	(2,047)	(3,294)
Prior service cost (credit)	(909)	(1,677)
Net loss (gain)	(990)	(1,705)
Total recorded in Accumulated other comprehensive loss (income)	(1,899)	(3,382)
Principal retiree benefit | Continuing operations
Amounts recorded in Statement of Financial Position
Non-current assets - other	0	0
Current liabilities - other	(205)	(222)
Non-current liabilities - compensation and benefits	(1,842)	(1,923)
Principal retiree benefit | Discontinued operations
Amounts recorded in Statement of Financial Position
Non-current assets - other	0	0
Current and non-current liabilities	0	(1,149)
Retiree health plans
Change in benefit obligations
Balance at January 1	1,991
Balance at December 31		$ 1,991
Retiree health plans | Continuing operations
Change in benefit obligations
Balance at December 31	$ 1,208