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SPECIAL ITEMS (Tables)
 6 Months Ended
Jun. 30, 2025
Unusual or Infrequent Items, or Both [Abstract]  
Special items - fleet transition and other
Three Months Ended June 30,Six Months Ended June 30,
(in millions)2025202420252024
Operating Expenses
Integration costs$53 $30 $93 $38 
Labor and other3 116 54 142 
Special items - operating$56 $146 $147 $180