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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, 2020
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Pension Plans | U.S.        
Components of net periodic benefit cost:        
Service cost $ 11 $ 10 $ 22 $ 20
Interest cost 7 9 15 17
Expected return on plan assets (13) (13) (26) (26)
Amortization of:        
Actuarial loss 5 3 10 7
Special termination benefits 0 0 0 0
Net periodic benefit cost 10 9 21 18
Pension Plans | International        
Components of net periodic benefit cost:        
Service cost 9 9 18 18
Interest cost 3 2 5 5
Expected return on plan assets (3) (4) (6) (7)
Amortization of:        
Actuarial loss 1 2 2 3
Special termination benefits 7 0 9 0
Net periodic benefit cost 17 9 28 19
Employer contributions     18  
Other than Pension Plans Post-retirement        
Components of net periodic benefit cost:        
Service cost 0 1 0 2
Interest cost 2 1 3 3
Expected return on plan assets 0 0 0 (1)
Amortization of:        
Actuarial loss 0 0 0 0
Special termination benefits 0 0 0 0
Net periodic benefit cost $ 2 $ 2 $ 3 $ 4