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Debt (Details) - USD ($) $ in Millions	Oct. 01, 2015	Sep. 30, 2015
Revolving Credit Facility [Member] | Senior Secured Revolving Credit Facility Due 2019 [Member]
Line of Credit Facility [Line Items]
Principal Amount		$ 122
Amount outstanding under line of credit		29
Short-term Term Loan Due 2016 [Member] | Term Loan [Member]
Line of Credit Facility [Line Items]
Principal Amount		313
Short-term Cash Grant Bridge Loan Due 2016 [Member] | Bridge Loan [Member]
Line of Credit Facility [Line Items]
Principal Amount		12
Limited-Recourse Senior Secured Term Loan Due 2033 [Member] | Limited Recourse Term Loan [Member]
Line of Credit Facility [Line Items]
Principal Amount		$ 31
Interest Rate		4.52%
Limited-recourse Term Loan Due 2026 [Member] | Limited Recourse Term Loan [Member]
Line of Credit Facility [Line Items]
Principal Amount		$ 81
Interest Rate		4.38%
Underlying Index Plus Margin [Member] | Limited-recourse Term Loan Due 2026 [Member] | Limited Recourse Term Loan [Member]
Line of Credit Facility [Line Items]
Principal Amount		$ 54
Indirect Subsidiary of NEP [Member] | Subsequent Event [Member] | Variable Rate Senior Secured Term Loans [Member]
Line of Credit Facility [Line Items]
Principal Amount	$ 600

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef



-Publisher FASB



-Name Accounting Standards Codification



-Topic 835



-SubTopic 30



-Section 55



-Paragraph 8



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-Section 45



-Paragraph 2



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X

- Definition

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))



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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef



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-Section S99



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