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Operating leases (Tables)
 9 Months Ended
May 31, 2017
Leases [Abstract]  
Reserve for Facility Closings and Related Lease Termination Charges
The changes in reserve for facility closings and related lease termination charges primarily in other non-current liabilities, include the following (in millions):
 
For the nine months ended May 31, 2017
 
For the twelve months ended August 31, 2016
Balance at beginning of period
$
466

 
$
446

Provision for present value of non-cancellable lease payments on closed facilities
271

 
134

Assumptions about future sublease income, terminations and changes in interest rates
(7
)
 
(34
)
Interest accretion
25

 
27

Cash payments, net of sublease income
(100
)
 
(107
)
Balance at end of period
$
655

 
$
466