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Operating Leases (Tables)
 6 Months Ended
Feb. 29, 2016
Operating Leases [Abstract]  
Reserve for Facility Closings and Related Lease Termination Charges
The changes in reserve for facility closings and related lease termination charges include the following (in millions):
 
    
Six Month
Period Ended
February 29,
2016
  
Twelve Month
Period Ended
August 31,
2015
 
Balance – beginning of period
 
$
446
  
$
257
 
Provision for present value of non-cancellable lease payments on closed facilities
  
77
   
231
 
Assumptions about future sublease income, terminations and changes in interest rates
  
(14
)
  
(6
)
Interest accretion
  
12
   
27
 
Liability assumed through acquisition of Alliance Boots
  
-
   
13
 
Cash payments, net of sublease income
  
(54
)
  
(76
)
Balance – end of period
 
$
467
  
$
446