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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Tables)
12 Months Ended
Dec. 31, 2020
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
(In millions)
Balance at
Beginning of
Period
Charged to
Costs and
Expenses
Charged to
Other Accounts
Deductions
Balance at
End of Period
Allowance for credit losses, deducted from accounts receivable
     
Year Ended December 31, 2020$43 $108 $— $(84)
(a)
$67 
Year Ended December 31, 201932 95 — (84)
(a)
43 
Year Ended December 31, 201828 83 — (79)
(a)
32 
Income tax valuation allowance, deducted from deferred tax assets
      
Year Ended December 31, 2020$242 $24 $— $— $266 
Year Ended December 31, 20193,794 (3,543)(9)— 242 
Year Ended December 31, 20181,863 1,934 (128)125 
(b)
3,794 
(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