v3.26.1
DISAGGREGATED REVENUE (Details) - USD ($)
$ in Millions
 12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue $ 8,795 $ 8,892 $ 9,424
U.S.      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue 8,552 8,645 9,158
International      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue 243 247 266
Priority      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue 5,560 5,584 5,957
Economy      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue 2,827 2,891 3,034
Other      
Revenues From External Customers And Long Lived Assets [Line Items]      
Revenue $ 408 $ 417 $ 433