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Schedule II - Valuation and qualifying accounts
 12 Months Ended
May 31, 2017
Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - Valuation and qualifying accounts
SCHEDULE II — Valuation and Qualifying Accounts
(In millions)
 
Balance at
Beginning of Period
 
Charged to Costs
and Expenses
 
Charged to Other Accounts(1)
 
Write-Offs, Net
 
Balance at End
of Period
Sales returns reserve
 
 
 
 
 
 
 
 
 

For the year ended May 31, 2015
 
$
308

 
$
726

 
$
(35
)
 
$
(620
)
 
$
379

For the year ended May 31, 2016
 
379

 
788

 
(15
)
 
(708
)
 
444

For the year ended May 31, 2017
 
444

 
696

 
3

 
(800
)
 
343

Allowance for doubtful accounts(2)
 
 
 
 
 
 
 
 
 
 
For the year ended May 31, 2015
 
$
78

 
$
35

 
$
(15
)
 
$
(20
)
 
$
78

For the year ended May 31, 2016
 
78

 
52

 
(2
)
 
(85
)
 
43

For the year ended May 31, 2017
 
43

 
16

 
—

 
(40
)
 
19

(1)
Amounts included in this column primarily relate to foreign currency translation.
(2)
Includes both current and non-current portions of the allowance for doubtful accounts. The non-current portion is included in Deferred income taxes and other assets on the Consolidated Balance Sheets.