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PENSION, DEFERRED COMPENSATION AND POST-RETIREMENT BENEFIT PLANS - Projected and Accumulated Benefit Obligation and Fair Value of Plan Assets (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 1,686 $ 1,568  
Pension Plans | Retirement Growth Account      
Defined Benefit Plan Disclosure      
Projected benefit obligation 946 940  
Accumulated benefit obligation 897 887  
Fair value of plan assets 981 930  
Pension Plans | Pension Plans Restoration      
Defined Benefit Plan Disclosure      
Projected benefit obligation 129 142  
Accumulated benefit obligation 113 124  
Fair value of plan assets 0 0  
Pension Plans | International      
Defined Benefit Plan Disclosure      
Projected benefit obligation 700 636 $ 631
Accumulated benefit obligation 636 576  
Fair value of plan assets 681 611 577
Defined benefit plans with obligations in excess of plan assets:      
Pension plans with projected benefit obligations in excess of the plans' assets, aggregate projected benefit obligations 369 330  
Pension plans with projected benefit obligations in excess of the plans' assets, aggregate fair value of plan assets 223 178  
Defined benefit plans with accumulated benefit obligations in excess of plan assets:      
Pension plans with accumulated benefit obligations in excess of the plans' assets, aggregate accumulated benefit obligations 127 246  
Pension plans with accumulated benefit obligations in excess of the plans' assets, aggregate fair value of plan assets 5 128  
Pension Plans | U.S.      
Defined Benefit Plan Disclosure      
Projected benefit obligation 1,075 1,082 966
Fair value of plan assets 981 930 832
Other than Pension Plans      
Defined Benefit Plan Disclosure      
Projected benefit obligation 209 190 183
Accumulated benefit obligation 0 0  
Fair value of plan assets $ 24 $ 27 $ 31