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Operating leases (Tables)
 3 Months Ended
Nov. 30, 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 three months ended November 30, 2017
 
For the twelve months ended August 31, 2017
Balance at beginning of period
$
718

 
$
466

Provision for present value of non-cancellable lease payments on closed facilities
29

 
344

Assumptions about future sublease income, terminations and changes in interest rates
1

 
13

Interest accretion
9

 
37

Cash payments, net of sublease income
(61
)
 
(142
)
Balance at end of period
$
696

 
$
718