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Fair Value of Financial Instruments - Counterparty Credit Risk (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2021 USD ($)	Sep. 30, 2021 USD ($)
Concentration of Credit Risk
Counterparty credit exposure to a portion of the Company's counterparties		$ 2,900
Collateral held (cash and letters of credit) against counterparty credit exposure to a portion of the Company's counterparties	$ 1,100	1,100
Net counterparty credit exposure to a portion of the Company's counterparties	$ 1,900	$ 1,900
Company's exposure before collateral expected to roll off (as a percent)		59.00%
Net exposure (as a percent)	100.00%	100.00%
Counterparty credit risk exposure to certain counterparties, threshold (as a percent)		10.00%
Estimated counterparty credit risk exposure under certain long term agreements for the next 5 years		$ 1,400
Period of estimated counterparty credit risk exposure under certain long term agreements, including California tolling agreements, South Central load obligations and solar power purchase agreements (in years)		5 years
Designated as Hedging Instrument
Concentration of Credit Risk
Counterparty credit exposure to a portion of the Company's counterparties	$ 403
Investment grade
Concentration of Credit Risk
Net exposure (as a percent)	78.00%	78.00%
Non-Investment grade/Non-Rated
Concentration of Credit Risk
Net exposure (as a percent)	22.00%	22.00%
Utilities, energy merchants, marketers and other
Concentration of Credit Risk
Net exposure (as a percent)	49.00%	49.00%
Financial Institutions
Concentration of Credit Risk
Net exposure (as a percent)	51.00%	51.00%

X

- Definition

Carrying amount as of the balance sheet date of cash collateral and letters of credit received by the entity on deposit from third parties in support of energy risk management.

+ References

No definition available.

+ Details

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X

- Definition

The percentage of net counterparty credit exposure that rolls-off by the end of 2012.

+ References

No definition available.

+ Details

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X

- Definition

Represents the threshold percentage for disclosure of counterparty credit exposure.

+ References

No definition available.

+ Details

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X

- Definition

Represents the percentage of net counterparty credit exposure of the entity.

+ References

No definition available.

+ Details

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X

- Definition

This element represents the estimated amount of the counterparty credit risk exposure.

+ References

No definition available.

+ Details

Name:	nrg_EstimatedCounterpartyCreditRiskExposureToCertainCounterparties
Namespace Prefix:	nrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period

+ References

No definition available.

+ Details

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X

- Definition

Represents the net exposure of the entity determined as total credit exposure to all counterparties less collateral (cash and letters of credit) held against those positions as of the reporting date.

+ References

No definition available.

+ Details

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X

- Definition

Maximum amount of loss due to credit risk that, based on the gross fair value of the financial instrument, the entity would incur if parties to the financial instruments that make up the concentration failed completely to perform according to the terms of the contracts and the collateral or other security, if any, for the amount due proved to be of no value to the entity.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123594938&loc=d3e13537-108611

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Details

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- Details

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