PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Defined Benefit Pension Plans) (Details) - USD ($) $ in Millions	3 Months Ended			12 Months Ended
	Dec. 31, 2023	Jun. 30, 2023	Mar. 31, 2021	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)			$ 1,268
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment			$ 19	$ (642)
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	$ 1,681
Defined Benefit Plan, Plan Assets, Payment for Settlement	1,617
Corporate Segment [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment				(642)
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss)				(1,086)	$ 8,433
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement and Curtailment				(642)	0	$ 18
Employer contributions				142	$ 235
Expected pension contributions	$ 150			$ 150
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount rate - benefit obligations	4.73%			4.73%	5.18%	2.57%
Discount rate - net periodic costs				5.26%	2.57%	2.40%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate	3.99%			3.99%	4.19%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate				4.19%	3.57%	3.55%
Rate of compensation increase - benefit obligations	3.80%			3.80%	4.05%
Rate of compensation increase - net periodic costs				4.05%	3.94%	3.91%
Expected return on plan assets - net periodic costs				6.62%	6.68%	6.86%
Defined Benefit Plan, Accumulated Benefit Obligation	$ 22,300			$ 22,300	$ 22,600
Defined Benefit Plan, Plan Assets, Increase (Decrease) for Assets Transferred to (from) Plan		$ (90)		(73)	(592)
Defined Benefit Plan, Plan Assets, Payment for Settlement				$ 1,777	$ 0
UNITED STATES
Defined Benefit Plan, Assumptions Used in Calculations [Abstract]
Discount rate - benefit obligations	5.30%			5.30%	5.64%
Discount rate - net periodic costs				5.76%	3.04%	3.03%
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Weighted-Average Interest Crediting Rate	4.50%			4.50%	4.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Weighted-Average Interest Crediting Rate				4.50%	4.50%	4.50%
Rate of compensation increase - benefit obligations	4.25%			4.25%	4.25%
Rate of compensation increase - net periodic costs				4.25%	4.25%	4.25%
Expected return on plan assets - net periodic costs				7.46%	7.95%	7.96%