Amount of amortization expense attributable to debt issuance costs.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Face (par) amount of debt instrument at time of issuance.

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

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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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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Capitalization - Schedule of Debt (Details) - NEP OpCo [Member] - USD ($)	1 Months Ended	3 Months Ended	9 Months Ended
	Jul. 24, 2019	Sep. 30, 2019	Sep. 30, 2019	Sep. 23, 2019	Jun. 30, 2019	Jun. 27, 2019
Secured Debt [Member]
Debt Instrument [Line Items]
Amortization of debt issuance costs		$ 6,000,000	$ 6,000,000
Secured Debt [Member] \| Revolving Credit Facility [Member]
Debt Instrument [Line Items]
NEP OpCo senior secured revolving credit facility		$ 450,000,000	$ 450,000,000
Repayments of revolving credit facility	$ 450,000,000
Unsecured Debt [Member]
Debt Instrument [Line Items]
Interest Rate		3.875%	3.875%	3.875%	4.25%	4.25%
NEP OpCo senior unsecured notes		$ 500,000,000	$ 500,000,000	$ 500,000,000	$ 700,000,000	$ 700,000,000
Limited Recourse Debt [Member]
Debt Instrument [Line Items]
Repayments of outstanding indebtedness			$ 214,000,000