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Retirement benefits (Tables)
 6 Months Ended
Feb. 28, 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
February 28,
 
Six months ended
February 28,
 
2018
 
2017
 
2018
 
2017
Service costs
$
1

 
$
—

 
$
3

 
$
2

Interest costs
49

 
43

 
96

 
86

Expected returns on plan assets
(53
)
 
(36
)
 
(104
)
 
(73
)
Curtailments
—

 
2

 
—

 
2

Total net periodic pension costs
$
(3
)
 
$
9

 
$
(5
)
 
$
17