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PENSION, DEFERRED COMPENSATION AND POST-RETIREMENT BENEFIT PLANS - Fair Values of the Company's Pension and Post-Retirement Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2019
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 1,686 $ 1,568  
Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 457 388  
Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 791 825  
Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 54 49  
Assets Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 384 306  
Cash and cash equivalents      
Defined Benefit Plan Disclosure      
Fair value of plan assets 2 2  
Cash and cash equivalents | Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 2 2  
Cash and cash equivalents | Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Cash and cash equivalents | Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Cash and cash equivalents | Assets Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Short term investment funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets 13 13  
Short term investment funds | Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Short term investment funds | Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 7 7  
Short term investment funds | Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Short term investment funds | Assets Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 6 6  
Government and agency securities      
Defined Benefit Plan Disclosure      
Fair value of plan assets 124 152  
Government and agency securities | Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Government and agency securities | Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 124 152  
Government and agency securities | Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Government and agency securities | Assets Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Commingled funds      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 1,389 1,259  
Commingled funds | Minimum      
Defined Benefit Plan Disclosure      
Monthly and quarterly redemption notice periods 10 days    
Commingled funds | Maximum      
Defined Benefit Plan Disclosure      
Monthly and quarterly redemption notice periods 30 days    
Commingled funds | Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 455 386  
Commingled funds | Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 660 666  
Commingled funds | Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Commingled funds | Assets Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 274 207  
Insurance contracts      
Defined Benefit Plan Disclosure      
Fair value of plan assets 54 49  
Insurance contracts | Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Insurance contracts | Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Insurance contracts | Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 54 49 $ 49
Insurance contracts | Assets Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Limited partnerships and hedge fund investments      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 104 93  
Limited partnerships and hedge fund investments | Minimum      
Defined Benefit Plan Disclosure      
Monthly and quarterly redemption notice periods 30 days    
Limited partnerships and hedge fund investments | Maximum      
Defined Benefit Plan Disclosure      
Monthly and quarterly redemption notice periods 90 days    
Limited partnerships and hedge fund investments | Level 1      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 0 0  
Limited partnerships and hedge fund investments | Level 2      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Limited partnerships and hedge fund investments | Level 3      
Defined Benefit Plan Disclosure      
Fair value of plan assets 0 0  
Limited partnerships and hedge fund investments | Assets Measured at NAV      
Defined Benefit Plan Disclosure      
Fair value of plan assets $ 104 $ 93