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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 |  |  |  |

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