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Retirement Benefits (Tables)
 3 Months Ended
Nov. 30, 2014
Retirement Benefits [Abstract]  
Postemployment Components Net Periodic Benefit Cost Disclosure
Components of net periodic benefit costs (In millions):

  
Three Months Ended
November 30,
 
  
2014
  
2013
 
Service cost
 
$
3
  
$
2
 
Interest cost
  
4
   
4
 
Amortization of actuarial loss
  
5
   
3
 
Amortization of prior service cost
  
(6
)
  
(5
)
Total postretirement benefit cost
 
$
6
  
$
4