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PENSION, DEFERRED COMPENSATION AND POST-RETIREMENT BENEFIT PLANS - Components of Net Periodic Benefit Cost (Details) - USD ($)
$ in Millions
 12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Pension Plans | U.S.      
Components of net periodic benefit cost:      
Service cost $ 45 $ 39 $ 38
Interest cost 31 35 37
Expected return on assets (53) (53) (55)
Amortization of:      
Actuarial loss 20 15 11
Prior service cost 0 0 1
Settlements 0 0 0
Special termination benefits 0 0 0
Net periodic benefit cost $ 43 $ 36 $ 32
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Expected return on assets (as a percent) 6.25% 6.75% 6.75%
Pension Plans | U.S. | Minimum      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 2.50% 2.50% 3.40%
Rate of compensation increase (as a percent) 2.50% 2.50% 2.50%
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 2.50% 3.40% 4.10%
Rate of compensation increase (as a percent) 2.50% 2.50% 2.50%
Pension Plans | U.S. | Maximum      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 3.00% 3.00% 3.80%
Rate of compensation increase (as a percent) 8.00% 8.00% 8.00%
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 3.00% 3.80% 4.30%
Rate of compensation increase (as a percent) 8.00% 8.00% 8.00%
Pension Plans | U.S. | Weighted Average      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 2.94%    
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 2.93%    
Expected return on assets (as a percent) 6.25%    
Pension Plans | International      
Components of net periodic benefit cost:      
Service cost $ 36 $ 36 $ 30
Interest cost 10 11 13
Expected return on assets (14) (14) (14)
Amortization of:      
Actuarial loss 4 6 3
Prior service cost (1) 0 (1)
Settlements 0 0 1
Special termination benefits 10 0 0
Net periodic benefit cost $ 45 $ 39 $ 32
Pension Plans | International | Minimum      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 0.50% 0.50% 0.25%
Rate of compensation increase (as a percent) 1.00% 1.00% 1.00%
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 0.50% 0.25% 0.50%
Expected return on assets (as a percent) 1.25% 1.50% 1.50%
Rate of compensation increase (as a percent) 1.00% 1.00% 1.00%
Pension Plans | International | Maximum      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 7.25% 7.00% 8.50%
Rate of compensation increase (as a percent) 5.00% 5.50% 5.50%
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 7.00% 8.50% 7.50%
Expected return on assets (as a percent) 7.00% 8.50% 7.50%
Rate of compensation increase (as a percent) 5.50% 5.50% 5.50%
Pension Plans | International | Weighted Average      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 1.59%    
Rate of compensation increase (as a percent) 2.81%    
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 1.44%    
Expected return on assets (as a percent) 2.06%    
Rate of compensation increase (as a percent) 2.72%    
Other than Pension Plans      
Components of net periodic benefit cost:      
Service cost $ 2 $ 3 $ 3
Interest cost 6 6 7
Expected return on assets (1) (2) (2)
Amortization of:      
Actuarial loss 0 0 0
Prior service cost 0 0 0
Settlements 0 0 0
Special termination benefits 0 0 0
Net periodic benefit cost $ 7 $ 7 $ 8
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Expected return on assets (as a percent) 6.25% 6.75% 6.75%
Other than Pension Plans | Minimum      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 2.70% 2.70% 3.25%
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 2.70% 3.25% 3.75%
Other than Pension Plans | Maximum      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 9.00% 9.00% 9.75%
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 9.00% 9.75% 9.75%
Other than Pension Plans | Weighted Average      
Assumptions used to determine benefit obligations at June 30      
Discount rate (as a percent) 2.92%    
Assumptions used to determine net periodic benefit cost for the year ended June 30      
Discount rate (as a percent) 2.90%    
Expected return on assets (as a percent) 6.25%