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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Net income/(loss) attributable to continuing and discontinued operations
The following table reflects the net income/(loss) attributable to NRG Energy, Inc. after removing the net loss attributable to the noncontrolling interest and redeemable noncontrolling interest:
 Year Ended December 31,
(In millions)202020192018
Income from continuing operations, net of income tax$510 $4,117 $465 
Income/(loss) from discontinued operations, net of income tax— 321 (197)
Net income attributable to NRG Energy, Inc. stockholders
$510 $4,438 $268 
Accounts Receivable, Allowance for Credit Loss
The following table represents the activity in the allowance for credit losses for the year ended December 31, 2020:
(In millions)Year Ended December 31, 2020
Beginning balance$43 
Provision for credit losses108 
Write-offs(101)
Recoveries collected17 
Ending balance$67 
Reconciliation of cash, cash equivalents, and restricted cash and cash equivalents
The following table provides a reconciliation of cash and cash equivalents, restricted cash and funds deposited by counterparties reported within the consolidated balance sheets that sum to the total of the same such amounts shown in the statements of cash flows.
 Year Ended December 31,
(In millions)202020192018
Cash and cash equivalents$3,905 $345 $563 
Funds deposited by counterparties19 32 33 
Restricted cash6 8 17 
Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statements of cash flows
$3,930 $385 $613 
Detail of supplemental disclosures of cash flow and non-cash investing and financing information was:
 Year Ended December 31,
 (In millions)202020192018
Interest paid, net of amount capitalized$340 $372 $436 
Income taxes paid, net of refunds24 8 9 
Non-cash investing activities:
(Decreases)/additions to fixed assets for accrued capital expenditures(6)1 20 
Changes in redeemable noncontrolling interest The following table reflects the changes in the Company's redeemable noncontrolling interest balance for the years ended December 31, 2020, 2019 and 2018.
(In millions)
Balance as of December 31, 2017$78 
Distributions to redeemable noncontrolling interest(3)
Contributions from redeemable noncontrolling interest26 
Non-cash adjustments to redeemable noncontrolling interest(8)
Net income attributable to redeemable noncontrolling interest - continuing operations1 
Net loss attributable to redeemable noncontrolling interest - discontinued operations(27)
Sale of NRG Yield and the Renewables Platform (a)(48)
Balance as of December 31, 201819 
Distributions to redeemable noncontrolling interest(2)
Net income attributable to redeemable noncontrolling interest - continuing operations3 
Balance as of December 31, 201920 
Repurchase of redeemable noncontrolling interest(20)
Balance as of December 31, 2020$— 
(a) See Note 4, Acquisitions, Discontinued Operations and Dispositions, for further information regarding the sale of NRG Yield and its Renewables Platform