PENSION PLANS AND OTHER POSTRETIREMENT BENEFITS (Fair Value Measurement of Level 3 Pension Plan Assets) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 19,600	$ 21,200
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	19,634	21,231	$ 28,167
Pension Plan [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	7	12	12
Plan Assets Still Held	(3)	(12)
Purchases, sales and settlements, net	(2)	6
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3		6
Equity securities | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	3,163	3,975
Equity securities | Pension Plan [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	5	6	6
Plan Assets Still Held	1	(6)
Purchases, sales and settlements, net	(2)	0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3		6
Fixed Income Securities | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	8,985	8,244
Fixed Income Securities | Pension Plan [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	1	1
Plan Assets Still Held	0	0
Purchases, sales and settlements, net	0	0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3		0
Alternative Investments | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	(11)	(78)
Alternative Investments | Pension Plan [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	1	5	5
Plan Assets Still Held	(4)	(6)
Purchases, sales and settlements, net	0	6
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3		0
Other Investments | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	609	1,103
Other Investments | Pension Plan [Member] | Significant Unobservable Inputs (Level 3)
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	0	0	$ 0
Plan Assets Still Held	0	0
Purchases, sales and settlements, net	$ 0	0
Defined Benefit Plan, Plan Assets Level 3 Reconciliation, Increase (Decrease) for Assets Transferred into (out of) Level 3		$ 0