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Schedule II
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]
Description
 
Balance at
Beginning of Year
 
Charges to
Costs and
Expenses (a)
 
Deductions to
Allowances for
Uncollectible
Accounts (b)
 
Charges to
(Deductions from)
Other Accounts (c)
 
Balance at
End of Year
Year Ended December 31, 2017:
 
 
 
 
 
 
 
 
 
 
Allowances for uncollectible accounts and sales returns and allowances
 
$
119

 
14

 
(18
)
 
(17
)
 
$
98

Year Ended December 31, 2016:
 
 
 
 
 
 
 
 
 
 
Allowances for uncollectible accounts and sales returns and allowances
 
$
119

 
9

 
(11
)
 
2

 
$
119

Year Ended December 31, 2015:
 
 
 
 
 
 
 
 
 
 
Allowances for uncollectible accounts and sales returns and allowances
 
$
105

 
15

 
(16
)
 
15

 
$
119


(a) Represents allowances for uncollectible accounts established through selling, general and administrative expenses.
(b) Represents actual write-offs of uncollectible accounts.
(c) Represents net change in allowances for sales returns, recorded as contra-revenue.