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Available-for-Sale Investments (Tables)
6 Months Ended
Feb. 29, 2016
Available-for-Sale Investments [Abstract]  
Summary of Cost and Fair Value of Available-for-Sale Securities
A summary of the cost and fair value of available-for-sale securities, with gross unrealized gains and losses, is as follows (in millions):

  
February 29, 2016
 
  
Amortized
cost basis
  
Gross
unrealized
gains
  
Gross
unrealized
losses
  
Fair value
 
AmerisourceBergen common stock
 
$
717
  
$
276
  
$
-
  
$
993
 
Other investments
  
38
   
-
   
(4
)
  
34
 
Total available-for-sale investments
 
$
755
  
$
276
  
$
(4
)
 
$
1,027
 
 
  
August 31, 2015
 
  
Amortized
cost basis
  
Gross
unrealized
gains
  
Gross
unrealized
losses
  
Fair value
 
AmerisourceBergen common stock
 
$
717
  
$
430
  
$
-
  
$
1,147
 
Other investments
  
37
   
-
   
(1
)
  
36
 
Total available-for-sale investments
 
$
754
  
$
430
  
$
(1
)
 
$
1,183