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Debt and Capital Leases - Energy Center Minneapolis Series Notes (Details) - USD ($) $ in Millions	Jun. 19, 2018	Jun. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Amount	$ 120	$ 16,092	$ 16,633
Non Recourse Debt
Debt Instrument [Line Items]
Amount		$ 8,363	$ 9,451
Non Recourse Debt | Energy Center Minneapolis Series E Notes, due 2033
Debt Instrument [Line Items]
Amount	$ 70
Interest Rate	4.80%
Non Recourse Debt | Energy Center Minneapolis Series F Notes, due 2033
Debt Instrument [Line Items]
Amount	$ 10
Interest Rate	4.60%
Non Recourse Debt | Energy Center Minneapolis Series G Notes, due 2035
Debt Instrument [Line Items]
Amount	$ 83
Interest Rate	5.90%
Non Recourse Debt | Energy Center Minneapolis Series H Notes, due 2037
Debt Instrument [Line Items]
Amount	$ 40
Interest Rate	4.83%
Non Recourse Debt | NRG Energy Center Minneapolis LLC Series E, F, G And H Notes
Debt Instrument [Line Items]
Amount	$ 203
Non Recourse Debt | Repayment of Energy Center Minneapolis Series C Notes, due 2025
Debt Instrument [Line Items]
Interest Rate	5.95%
Repayment of Energy Center Minneapolis Series C Notes, due 2025	$ (83)

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Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
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-Name Accounting Standards Codification
-Topic 210
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-Paragraph 1
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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
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