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Retirement Benefit Obligations - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Sep. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2012
Sep. 30, 2013
Retiree Medical Plans [Member]
Mar. 31, 2014
Domestic Pension Benefits Plans [Member]
Jun. 30, 2013
21st Century Fox [Member]
Jun. 30, 2013
21st Century Fox [Member]
Unfunded Other Postretirement Benefit Plans [Member]
Jun. 30, 2014
Equity Securities [Member]
Jun. 30, 2014
Fixed Income Securities [Member]
Jun. 30, 2014
Cash and Other [Member]
Defined Benefit Plan Disclosure [Line Items]                      
Fair value of plan assets   $ 1,535 $ 1,286       $ 58        
Projected benefit obligations             106 11      
Other comprehensive income             36 3      
Other comprehensive income, net of tax             22 2      
Contribution of pension by the Company   136 134 141     20        
Net pension liability   217 353                
Reduction in Retirement benefit obligations due to changes made in defined benefit pension and retiree medical plans   69     41 28          
Third party contributions made to pension plans 37                    
Accumulated pension benefit obligations   1,590 1,424                
Net periodic benefit costs   7 56 45              
Settlements, curtailments and other   4                  
Pension asset portfolio, percentage                 31.00% 53.00% 16.00%
Pension plan contributions for next fiscal year   $ 10