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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2019
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)201920182017
Income/(loss) from continuing operations, net of income tax$4,117  $465  $(977) 
Income/(loss) from discontinued operations, net of income tax321  (197) (1,176) 
Net income/(loss) attributable to NRG Energy, Inc. stockholders
$4,438  $268  $(2,153) 
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)201920182017
Cash and cash equivalents$345  $563  $770  
Funds deposited by counterparties32  33  37  
Restricted cash8  17  279  
Cash and cash equivalents, funds deposited by counterparties and restricted cash shown in the statements of cash flows
$385  $613  $1,086  
Detail of supplemental disclosures of cash flow and non-cash investing and financing information was:
 Year Ended December 31,
 (In millions)201920182017
Interest paid, net of amount capitalized$372  $436  $543  
Income taxes paid, net of refunds8  9  9  
Non-cash investing activities:
Additions to fixed assets for accrued capital expenditures1  20  19  
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, 2019, 2018, and 2017.
(In millions)
Balance as of December 31, 2016$46  
Distributions to redeemable noncontrolling interest(2) 
Contributions from redeemable noncontrolling interest99  
Non-cash adjustments to redeemable noncontrolling interest7  
Comprehensive loss attributable to redeemable noncontrolling interest(72) 
Balance as of December 31, 201778  
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, 2019$20  
(a) See Note 4, Acquisitions, Discontinued Operations and Dispositions, for further information regarding the sale of NRG Yield and its Renewables Platform