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Other Postretirement Benefits - Additional Information (Detail)
$ in Millions
12 Months Ended
Jun. 30, 2017
USD ($)
plan
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Defined Contribution Plan Disclosure [Line Items]      
Number of funded status of defined benefit pension plans | plan 2    
Employer contributions to defined contribution plans $ 137 $ 132 $ 138
Unfunded obligation of plan 40 36  
Multiemployer Pension Plans [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Period contributions $ 5 $ 5 $ 5
Minimum [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 5.00%    
Minimum [Member] | Plans in Red Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 5.00%    
Minimum [Member] | Plans in Yellow Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 65.00%    
Minimum [Member] | Plans in Green Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 5.00%    
Maximum [Member] | Plans in Red Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 65.00%    
Maximum [Member] | Plans in Yellow Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 80.00%    
Maximum [Member] | Plans in Green Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 80.00%