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STOCKHOLDERS' EQUITY - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance $ 2,219 $ 1,864 $ 1,688
Total recorded in accumulated other comprehensive income, before tax 76 71 85
Income tax (provision) benefit (1) 3 (4)
Ending balance 3,538 2,219 1,864
Accumulated Other Comprehensive Income      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Beginning balance 74 81 72
Ending balance 75 74 81
Actuarial gain (loss) associated with pension and postretirement      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax 4 (2) 18
Prior service credit      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax 3 0 0
Recognition of prior service credit due to curtailment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax 0 (3) 0
Recognition of net actuarial gain due to curtailment      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax (4) 0 0
Recognition of net actuarial loss due to special termination benefits      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax 4 0 0
Amortization of prior service credit      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax (5) (5) (5)
Other comprehensive income (loss)      
AOCI Attributable to Parent, Net of Tax [Roll Forward]      
Reclassification from AOCI, before tax $ 2 $ (10) $ 13