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Retirement benefits (Tables)
 3 Months Ended
Nov. 30, 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 November 30,
 
Location in Consolidated Condensed Statements of Earnings
2018
 
2017
Service costs
Selling, general and administrative expenses
$
1

 
$
2

Interest costs
Other expense1
49

 
47

Expected returns on plan assets/other
Other income1
(60
)
 
(51
)
Total net periodic pension costs (income)
 
$
(10
)
 
$
(2
)


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