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Other Postretirement Benefits - Additional Information (Detail)
$ in Millions
12 Months Ended
Jun. 30, 2020
USD ($)
Plan
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Defined Contribution Plan Disclosure [Line Items]      
Number of funded status of defined benefit pension plans | Plan 2    
Employer contributions to defined contribution plans $ 154 $ 145 $ 145
Unfunded obligation of plan $ 46 45  
Minimum      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 5.00%    
Pension Plan      
Defined Contribution Plan Disclosure [Line Items]      
Period contributions $ 5 $ 5 $ 5
Multiemployer Plans in Red Zone | Minimum      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 5.00%    
Multiemployer Plans in Red Zone | Maximum      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 65.00%    
Multiemployer Plans in Yellow Zone | Minimum      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 65.00%    
Multiemployer Plans in Yellow Zone | Maximum      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 80.00%    
Multiemployer Plans in Green Zone | Minimum      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 5.00%    
Multiemployer Plans in Green Zone | Maximum      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 80.00%