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VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts Disclosure
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
For the Years Ended December 31, 2018, 2017, and 2016
 
Balance at
Beginning of
Period
 
Charged to
Costs and
Expenses
 
Charged to
Other Accounts
 
Deductions
 
Balance at
End of Period
 
(In millions)
Allowance for doubtful accounts, deducted from accounts receivable
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2018
$
28

 
$
83

 
$
—

 
$
(79
)
(a) 
$
32

Year Ended December 31, 2017
28

 
57

 
—

 
(57
)
(a) 
28

Year Ended December 31, 2016
21

 
55

 
—

 
(48
)
(a) 
28

Income tax valuation allowance, deducted from deferred tax assets
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2018
$
1,863

 
$
1,934

 
$
(128
)
 
$
125

(b) 
$
3,794

Year Ended December 31, 2017
4,116

 
(151
)
 
(15
)
 
(2,087
)
(c) 
1,863

Year Ended December 31, 2016
3,575

 
306

 
235

 
—

 
4,116

(a)
Represents principally net amounts charged as uncollectible
(b)
Represents removal of NRG Yield, Inc. and its Renewables Platform due to their sale on August 31, 2018
(c)
Represents deconsolidation of GenOn due to its petition for bankruptcy on June 14, 2017