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Schedule II: Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Schedule II: Valuation and Qualifying Accounts
Schedule II: Valuation and Qualifying Accounts
The table below details the activity of the allowance for doubtful accounts and sales credits for the three years ended December 31, 2016 (in millions):
 
Balance at
Beginning of
Year
 
Additions
 
Usage
 
Balance at
End of Year
 
(In millions)
Year ended December 31, 2014
$
631

 
$
1,240

 
$
(1,646
)
 
$
225

Year ended December 31, 2015
$
225

 
$
579

 
$
(508
)
 
$
296

Year ended December 31, 2016
$
296

 
$
942

 
$
(771
)
 
$
467


Note:
Additions to the allowance for doubtful accounts are charged to expense. Additions to the allowance for sales credits are charged against revenues. For the year ended December 31, 2014, additions included the impact from the Motorola acquisition and usage included the impact from the sale of Motorola Mobile business.