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Schedule of Valuation and Qualifying Accounts Disclosure
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure
CALPINE CORPORATION AND SUBSIDIARIES
SCHEDULE II VALUATION AND QUALIFYING ACCOUNTS

Description
Balance at
Beginning
of Year
 
Charged to
Expense
 
Charged to Other Accounts
 
Deductions(1)
 
Balance at
End of Year
 
(in millions)
Year Ended December 31, 2019
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
9

 
$
6

 
$
(1
)
 
$
(5
)
 
$
9

Deferred tax asset valuation allowance
1,000

 
(127
)
 
—

 
—

 
873

Year Ended December 31, 2018
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
9

 
$
5

 
$
1

 
$
(6
)
 
$
9

Deferred tax asset valuation allowance
1,168

 
(168
)
 
—

 
—

 
1,000

Year Ended December 31, 2017
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
$
6

 
$
4

 
$
2

 
$
(3
)
 
$
9

Deferred tax asset valuation allowance
1,581

 
(413
)
 
—

 
—

 
1,168


____________
(1)    Represents write-offs of accounts considered to be uncollectible and previously reserved.