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ACCUMULATED OTHER COMPREHENSIVE LOSS (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive loss $ (299) $ (388) $ (262) $ (494)
AOCI Tax, Attributable to Parent 97 122 83 160
Reclassification from AOCI, Current Period, Tax (7) (4) (6)  
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax 25 8 21  
Other Comprehensive Income (Loss), Tax (18) 43 (71)  
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax 64 (134) 211  
AOCI - Marketable Securities [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent (46) (104) (5) 30
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 13 9 (6)  
Other Comprehensive Income (Loss), before Reclassifications, before Tax 45 (108) (29)  
AOCI - Employee Benefit Plan [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent (358) (421) (332) (659)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 19 3 33  
Other Comprehensive Income (Loss), before Reclassifications, before Tax 44 (92) 294  
AOCI - Interest Rate Derivatives [Member]        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
AOCI before Tax, Attributable to Parent 8 15 (8) $ (25)
Reclassification from AOCI, Current Period, before Tax, Attributable to Parent 0 0 0  
Other Comprehensive Income (Loss), before Reclassifications, before Tax $ (7) $ 23 $ 17