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Retirement benefits (Tables)
 9 Months Ended
May 31, 2019
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,
 
Location in Consolidated Condensed Statements of Earnings
2019
 
2018
 
2019
 
2018
Service costs
Selling, general and administrative expenses
$
2

 
$
2

 
$
4

 
$
5

Interest costs
Other expense1
49

 
50

 
148

 
146

Expected returns on plan assets/other
Other income1
(61
)
 
(54
)
 
(186
)
 
(158
)
Total net periodic pension costs (income)
 
$
(10
)
 
$
(2
)
 
$
(34
)
 
$
(7
)


1 Shown as Other income (expense) on Consolidated Condensed Statements of Earnings.