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Summary of Significant Accounting Policies - Pension Plan Contributions (Details) $ in Millions	Jun. 30, 2020 USD ($)
Accounting Policies [Abstract]
Pension plan employer contributions deferred until 2021 due to CARES Act	$ 47

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- Definition

Defined Benefit Plan, Deferral of Future Employer Contributions due to CARES Act

+ References

No definition available.

+ Details

Name:	nrg_DefinedBenefitPlanDeferralOfFutureEmployerContributionsDueToCARESAct
Namespace Prefix:	nrg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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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