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PENSION AND POST-RETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Pension Plans | U.S.        
Components of net periodic benefit cost:        
Service cost $ 10 $ 9 $ 20 $ 18
Interest cost 9 9 17 18
Expected return on plan assets (13) (13) (26) (26)
Amortization of:        
Actuarial loss 3 2 7 5
Net periodic benefit cost 9 7 18 15
Employer contributions     20  
Pension Plans | International        
Components of net periodic benefit cost:        
Service cost 9 7 18 15
Interest cost 2 3 5 6
Expected return on plan assets (4) (4) (7) (7)
Amortization of:        
Actuarial loss 2 2 3 2
Net periodic benefit cost 9 8 19 16
Employer contributions     6  
Other than Pension Plans Post-retirement        
Components of net periodic benefit cost:        
Service cost 1   2 1
Interest cost 1 2 3 4
Expected return on plan assets     (1) (1)
Amortization of:        
Net periodic benefit cost $ 2 $ 2 $ 4 $ 4