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Other Postretirement Benefits - Additional Information (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Defined Contribution Plan Disclosure [Line Items]      
Employer contributions to defined contribution plans $ 140 $ 136 $ 134
Unfunded obligation of plan 36 33  
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 Yellow Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of total contributions 5.00%    
Percentage of funded status of plan as certified by plan's actuary 65.00%    
Minimum [Member] | Plans in Green Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of funded status of plan as certified by plan's actuary 80.00%    
Maximum [Member] | Plans in Red Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of funded status of plan as certified by plan's actuary 65.00%    
Maximum [Member] | Plans in Yellow Zone [Member]      
Defined Contribution Plan Disclosure [Line Items]      
Percentage of funded status of plan as certified by plan's actuary 80.00%