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The number of shares converted in a noncash (or part noncash) transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period.

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

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Fair value amount of debt instrument that was repurchased.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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Capitalization - Narrative (Details) $ / shares in Units, shares in Thousands					3 Months Ended	9 Months Ended
	Oct. 21, 2019 $ / shares	Sep. 23, 2019 USD ($)	Jun. 27, 2019 USD ($)	Jun. 11, 2019 USD ($) MW	Sep. 30, 2019 USD ($) shares	Sep. 30, 2019 USD ($) shares	Oct. 23, 2019 USD ($)	Sep. 29, 2019 USD ($)	Jun. 30, 2019 USD ($)	May 03, 2019 USD ($)
Class of Stock [Line Items]
Antidilutive shares (in shares) \| shares					15,900	18,400
Subsequent Event [Member]
Class of Stock [Line Items]
Distribution made to limited partner, distributions declared, per unit (in dollars per share) \| $ / shares	$ 0.5175
LLC Agreement [Member]
Class of Stock [Line Items]
Period of cash distributions						6 years
LLC Agreement [Member] \| First Six Years After Closing [Member]
Class of Stock [Line Items]
Percentage of cash distributions						95.00%
Membership Purchase Agreement [Member]
Class of Stock [Line Items]
Period of cash distributions						6 years
Membership Purchase Agreement [Member] \| First Six Years After Closing [Member]
Class of Stock [Line Items]
Percentage of cash distributions						99.00%
Series A Convertible Preferred Units [Member]
Class of Stock [Line Items]
Conversion of stock, shares converted (in shares) \| shares					4,670
Conversion ratio					1
Common Units [Member] \| LLC Agreement [Member]
Class of Stock [Line Items]
Right to pay						70.00%
Common Units [Member] \| Membership Purchase Agreement [Member]
Class of Stock [Line Items]
Right to pay						100.00%
NEP Renewables II, LLC [Member]
Class of Stock [Line Items]
Purchaser's commitment to pay				$ 900,000,000
NEP Renewables II, LLC [Member] \| Class B Member Units [Member]
Class of Stock [Line Items]
Membership interests acquired				100.00%
Meade Pipeline Investment, LLC [Member] \| Meade Pipeline Co LLC [Member]
Class of Stock [Line Items]
Credit facility, maximum borrowing capacity								$ 918,000,000
Issuances of long-term debt								$ 820,000,000
NEP OpCo [Member]
Class of Stock [Line Items]
Membership interests acquired					50.00%	50.00%
NEP OpCo [Member] \| Unsecured Debt [Member]
Class of Stock [Line Items]
Aggregate principal amount		$ 500,000,000	$ 700,000,000		$ 500,000,000	$ 500,000,000			$ 700,000,000
Interest rate		3.875%	4.25%		3.875%	3.875%			4.25%
NEP OpCo [Member] \| Unsecured Debt [Member] \| Prior to April 15, 2024 [Member]
Class of Stock [Line Items]
Redemption price, percentage		100.00%	100.00%
NEP OpCo [Member] \| Unsecured Debt [Member] \| On or after April 15, 2024 [Member]
Class of Stock [Line Items]
Redemption price, percentage		100.00%	100.00%
NEP OpCo [Member] \| Revolving Credit Facility [Member]
Class of Stock [Line Items]
Credit facility, maximum borrowing capacity									$ 750,000,000	$ 1,250,000,000
NEP Renewables II Investor [Member] \| LLC Agreement [Member]
Class of Stock [Line Items]
Pre-tax return						8.30%
NEP Renewables II Investor [Member] \| LLC Agreement [Member] \| First Six Years After Closing [Member]
Class of Stock [Line Items]
Percentage of cash distributions						5.00%
NEP Renewables II Investor [Member] \| Class B Member Units [Member] \| NEP Renewables II, LLC [Member]
Class of Stock [Line Items]
Ownership percentage upon non-exercise of buyout					99.00%	99.00%
NEP Renewables Holdings II, LLC [Member] \| NEP Renewables II, LLC [Member]
Class of Stock [Line Items]
Noncontrolling interest, ownership percentage by parent				100.00%
NEP Renewables II, LLC [Member] \| Perrin Ranch Wind Energy Center [Member]
Class of Stock [Line Items]
Membership interests acquired				100.00%
Generation facility capacity (mw) \| MW				99
NEP Renewables II, LLC [Member] \| Tuscola Bay Wind Energy Center [Member]
Class of Stock [Line Items]
Membership interests acquired				100.00%
Generation facility capacity (mw) \| MW				120
NEP Renewables II, LLC [Member] \| Ashtabula Wind III Energy Center [Member]
Class of Stock [Line Items]
Membership interests acquired				100.00%
Generation facility capacity (mw) \| MW				62
NEP Renewables II, LLC [Member] \| Stateline Wind Energy Center [Member]
Class of Stock [Line Items]
Membership interests acquired				100.00%
Generation facility capacity (mw) \| MW				300
NEP Pipelines Class B [Member]
Class of Stock [Line Items]
Noncontrolling interest, ownership percentage by parent								100.00%
Noncontrolling interest commitment								$ 168,000,000
NEP Pipelines Class B [Member] \| Membership Purchase Agreement [Member]
Class of Stock [Line Items]
Pre-tax return						11.00%
NEP Pipelines Class B [Member] \| Membership Purchase Agreement [Member] \| First Six Years After Closing [Member]
Class of Stock [Line Items]
Percentage of cash distributions						1.00%
NEP Pipelines Class B [Member] \| Class B Member Units [Member]
Class of Stock [Line Items]
Ownership percentage upon non-exercise of buyout					99.00%	99.00%
NEP Pipelines Class A [Member]
Class of Stock [Line Items]
Noncontrolling interest, ownership percentage by parent								100.00%
Senior Secured Notes 5.600% Due 2038 [Member] \| Genesis HoldCo [Member] \| Secured Debt [Member]
Class of Stock [Line Items]
Interest rate					5.60%	5.60%
Repurchase amount					$ 236,000,000	$ 236,000,000
Series B Trust Certificates Due 2038 [Member]
Class of Stock [Line Items]
Interest rate					5.125%	5.125%
Series B Trust Certificates Due 2038 [Member] \| Subsequent Event [Member]
Class of Stock [Line Items]
Repurchase amount							$ 9,000,000
Series B Trust Certificates Due 2038 [Member] \| Genesis HoldCo [Member]
Class of Stock [Line Items]
Repurchase amount					$ 39,000,000	$ 39,000,000
Series B Trust Certificates Due 2038 [Member] \| Genesis OpCo [Member]
Class of Stock [Line Items]
Repurchase amount					$ 39,000,000	$ 39,000,000