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PENSION AND POST-RETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Pension Plans | U.S.        
Components of net periodic benefit cost:        
Service cost $ 12 $ 9 $ 34 $ 29
Interest cost 8 9 23 26
Expected return on plan assets (14) (14) (40) (40)
Amortization of:        
Actuarial loss 5 5 15 12
Settlements 0 0 0 0
Special termination benefits 0 0 0 0
Net periodic benefit cost 11 9 32 27
Pension Plans | International        
Components of net periodic benefit cost:        
Service cost 9 9 27 27
Interest cost 2 3 7 8
Expected return on plan assets (4) (4) (10) (11)
Amortization of:        
Actuarial loss 1 1 3 4
Settlements 1 0 1 0
Special termination benefits 1 1 10 1
Net periodic benefit cost 10 10 38 29
Employer contributions     22  
Other than Pension Plans Post-retirement        
Components of net periodic benefit cost:        
Service cost 2 0 2 2
Interest cost 1 2 4 5
Expected return on plan assets (1) 0 (1) (1)
Amortization of:        
Actuarial loss 0 0 0 0
Settlements 0 0 0 0
Special termination benefits 0 0 0 0
Net periodic benefit cost $ 2 $ 2 $ 5 $ 6