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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2019
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
SCHEDULE II — VALUATION AND QUALIFYING ACCOUNTS
For the Years Ended December 31, 2019, 2018, and 2017
(In millions)
Balance at
Beginning of
Period
Charged to
Costs and
Expenses
Charged to
Other Accounts
Deductions
Balance at
End of Period
Allowance for doubtful accounts, deducted from accounts receivable
      
Year Ended December 31, 2019$32  $95  $—  $(84) 
(a)
$43  
Year Ended December 31, 201828  83  —  (79) 
(a)
32  
Year Ended December 31, 201728  57  —  (57) 
(a)
28  
Income tax valuation allowance, deducted from deferred tax assets
       
Year Ended December 31, 2019$3,794  $(3,543) $(9) $—  $242  
Year Ended December 31, 20181,863  1,934  (128) 125  
(b)
3,794  
Year Ended December 31, 20174,116  (151) (15) (2,087) 
(c)
1,863  
(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