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EMPLOYEE BENEFIT PLANS - Change in Benefit Obligation (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning of year $ 2,900    
Projected benefit obligation, end of year 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 2,808    
Pension plan assets at fair value, end of year 2,110 2,808  
Pension Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Service cost 6 6 $ 6
Interest cost 57 46 77
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Pension plan assets at fair value, beginning of year 2,808 2,744  
Actual return on plan assets (515) 259  
Benefits paid (158) (165)  
Annuity purchases (25) (30)  
Pension plan assets at fair value, end of year 2,110 2,808 2,744
PBO 2,254 2,900  
Excess of PBO over pension plan assets, end of year 144 92  
Post-retirement Plans      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning of year 466 516  
Service cost 2 2 2
Interest cost 10 8 13
Contributions and benefits paid (20) (28)  
Actuarial (gains)/losses (109) (32)  
Benefits paid (20) (28)  
Projected benefit obligation, end of year 349 466 516
Qualified Plan | Pension Benefits      
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]      
Projected benefit obligation, beginning of year 2,900 3,180  
Interest cost 57 45  
Actuarial (gains)/losses (487) (95)  
Benefits paid (190) (198)  
Settlements (26) (32)  
Projected benefit obligation, end of year 2,254 2,900 $ 3,180
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]      
Pension plan assets at fair value, beginning of year 2,805    
Pension plan assets at fair value, end of year $ 2,117 $ 2,805