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Retirement benefits (Tables)
 9 Months Ended
May 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Components of Net Periodic Benefit Cost
Components of net periodic pension costs for the defined benefit pension plans (in millions):
 
Three months ended
 
Nine months ended
 
May 31, 2017
 
May 31, 2016
 
May 31, 2017
 
May 31, 2016
Service costs
$
1

 
$
1

 
$
3

 
$
3

Interest costs
43

 
77

 
129

 
236

Expected returns on plan assets/other
(41
)
 
(62
)
 
(112
)
 
(189
)
Total net periodic pension costs
$
3

 
$
16

 
$
20

 
$
50