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Retirement benefits (Tables)
 6 Months Ended
Feb. 28, 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
February 28,
 
Six months ended
February 28,
 
Location in Consolidated Condensed Statements of Earnings
2019
 
2018
 
2019
 
2018
Service costs
Selling, general and administrative expenses
$
1

 
$
1

 
$
2

 
$
3

Interest costs
Other expense1
50

 
49

 
99

 
96

Expected returns on plan assets/other
Other income1
(64
)
 
(53
)
 
(124
)
 
(104
)
Total net periodic pension costs (income)
 
$
(13
)
 
$
(3
)
 
$
(23
)
 
$
(5
)


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