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EMPLOYEE BENEFIT PLANS - Change in Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Pension Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning of year $ 2,254 $ 2,900  
Service cost 8 6 $ 6
Interest cost 107 57  
Actuarial (gains)/losses 60 (487)  
Benefits paid (191) (190)  
Settlements (12) (26)  
Projected benefit obligation, end of year 2,218 2,254 2,900
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Pension plan assets at fair value, beginning of year 2,110 2,808  
Actual return on plan assets 149 (515)  
Benefits paid and fees (159) (158)  
Settlements (12) (25)  
Other 18 0  
Pension plan assets at fair value, end of year 2,106 2,110 2,808
PBO 2,218 2,254  
Excess of PBO Over Pension Plan Assets 112 144  
Post-retirement Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning of year 349 466  
Service cost 1 2 2
Interest cost 17 10  
Contributions and benefits paid (19) (20)  
Actuarial (gains)/losses 5 (109)  
Benefits paid (19) (20)  
Projected benefit obligation, end of year $ 353 $ 349 $ 466