Annual report pursuant to Section 13 and 15(d)

PENSION AND POST RETIREMENT BENEFITS - Components of Accumulated Other Comprehensive Loss (Income) (Details)

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PENSION AND POST RETIREMENT BENEFITS - Components of Accumulated Other Comprehensive Loss (Income) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Jan. 01, 2023
Defined Benefit Plan Disclosure [Line Items]      
Service multiplier   $ 115 $ 126
Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation $ 42,000,000 41,000,000  
Actual returns on assets under (over) expected (60,000,000) 1,165,000,000  
Amortization of net actuarial gain (loss) (3,000,000) (13,000,000)  
Amortization of prior service credits (costs) (18,000,000) (5,000,000)  
Settlements 4,000,000 8,000,000  
Plan amendments 3,000,000 122,000,000  
OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation (12,000,000) (1,764,000,000)  
Actual returns on assets under (over) expected (24,000,000) 134,000,000  
Amortization of net actuarial gain (loss) 145,000,000 43,000,000  
Amortization of prior service credits (costs) 17,000,000 3,000,000  
Settlements 0 0  
Plan amendments 8,000,000 (163,000,000)  
Discount rates | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation 124,000,000 (1,143,000,000)  
Discount rates | OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation 28,000,000 (441,000,000)  
Demographic updates | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation (5,000,000) (102,000,000)  
Demographic updates | OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation (208,000,000) (7,000,000)  
Mortality | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation (2,000,000) 17,000,000  
Mortality | OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation (11,000,000) 0  
Per capita healthcare costs | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation 0 0  
Per capita healthcare costs | OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation 33,000,000 (1,333,000,000)  
Other | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation (1,000,000) (8,000,000)  
Other | OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation 0 0  
Actuarial loss (gain) on benefit obligation | Pension Benefits      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation 116,000,000 (1,236,000,000)  
Actuarial loss (gain) on benefit obligation | OPEB      
Defined Benefit Plan Disclosure [Line Items]      
Actuarial loss (gain) on benefit obligation $ (158,000,000) $ (1,781,000,000)