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Summary of Significant Accounting Policies - Securitization Proceeds (Details) - USD ($) $ in Millions	1 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022	Jun. 30, 2021
Accounting Policies [Abstract]
Uplift securitization proceeds received from ERCOT	$ 689	$ 689	$ 0

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- Definition

Proceeds From Government Grant

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No definition available.

+ Details

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Namespace Prefix:	nrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

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- References

No definition available.

+ Details

Name:	us-gaap_AccountingPoliciesAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration