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Goodwill and Other Intangibles - Out of Market Contracts (Details) - Out of Market Contracts - Lease Agreements $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Out of Market Contracts Five Year Maturity
2019	$ 8
2020	8
2021	8
2022	8
2023	$ 8

X

- Definition

The amount of amortization for out-of-market contracts expected to be recognized during the fifth twelve-month period following the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of amortization for out-of-market contracts expected to be recognized during the fourth twelve-month period following the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of amortization for out-of-market contracts expected to be recognized during the twelve-month period following the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of amortization for out-of-market contracts expected to be recognized during the third twelve-month period following the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

The amount of amortization for out-of-market contracts expected to be recognized during the second twelve-month period following the balance sheet date.

+ References

No definition available.

+ Details

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

X

- Definition

Out of Market Contract Five Year Maturity

+ References

No definition available.

+ Details

Name:	nrg_OutofMarketContractFiveYearMaturityAbstract
Namespace Prefix:	nrg_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	us-gaap_FairValueByLiabilityClassAxis=nrg_OutofMarketContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_LeaseAgreementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: