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Retirement benefits (Tables)
 9 Months Ended
May 31, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost
Components of net periodic pension costs for the defined benefit pension plans (in millions):
 
Three months ended
May 31,
 
Nine months ended
May 31,
 
2018
 
2017
 
2018
 
2017
Service costs
$
2

 
$
1

 
$
5

 
$
3

Interest costs
50

 
43

 
146

 
129

Expected returns on plan assets/other
(54
)
 
(41
)
 
(158
)
 
(112
)
Total net periodic pension costs
$
(2
)
 
$
3

 
$
(7
)
 
$
20