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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
Valuation And Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts

Schedule II

VALUATION AND QUALIFYING ACCOUNTS

(in millions)

 

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, 2016:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Allowances for uncollectible accounts and sales returns and

   allowances

 

$

89

 

 

 

—

 

 

 

—

 

 

 

4

 

 

$

93

 

Year Ended December 31, 2015:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Allowances for uncollectible accounts and sales returns and

   allowances

 

$

120

 

 

 

—

 

 

 

—

 

 

 

(31

)

 

$

89

 

Year Ended December 31, 2014:

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Allowances for uncollectible accounts and sales returns and

   allowances

 

$

209

 

 

 

—

 

 

 

—

 

 

 

(89

)

 

$

120

 

 

(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.