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Operating Leases (Tables)
 6 Months Ended
Feb. 28, 2017
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):
 
For the six months ended February 28, 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
258

 
134

Assumptions about future sublease income, terminations and changes in interest rates
(10
)
 
(34
)
Interest accretion
16

 
27

Cash payments, net of sublease income
(59
)
 
(107
)
Balance at end of period
$
671

 
$
466