v3.26.1
PENSION AND POST-RETIREMENT BENEFIT PLANS - Changes in Level 3 Plan Assets (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Changes in Level 3 plan assets    
Fair value of plan assets, beginning of year $ 1,437  
Actual return on plan assets:    
Fair value of plan assets, end of year 1,554 $ 1,437
Level 3    
Changes in Level 3 plan assets    
Fair value of plan assets, beginning of year 18  
Actual return on plan assets:    
Fair value of plan assets, end of year 20 18
Insurance contracts    
Changes in Level 3 plan assets    
Fair value of plan assets, beginning of year 18  
Actual return on plan assets:    
Fair value of plan assets, end of year 20 18
Insurance contracts | Level 3    
Changes in Level 3 plan assets    
Fair value of plan assets, beginning of year 18 14
Actual return on plan assets:    
Relating to assets still held at the reporting date 0 0
Purchases, sales, issuances and settlements, net 1 3
Foreign exchange impact 1 1
Fair value of plan assets, end of year $ 20 $ 18