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Acquisitions - Narrative (Details) $ in Millions | Sep. 29, 2019 USD ($) mi Bcf | Jun. 11, 2019 USD ($) solar_generation_facility MW | Sep. 30, 2019 USD ($) | Dec. 31, 2018 USD ($) solar_generation_facility wind_generation_facility MW
--- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |
Goodwill |  |  | $ 609 | $ 584
NEP Renewables, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Generation facility capacity (mw) | MW |  |  |  | 1,388
Number of solar generation facilities | solar_generation_facility |  |  |  | 1
Number of wind generation facilities | wind_generation_facility |  |  |  | 10
June 2019 Acquisition [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Amortization of the intangible assets - PPAs expected in 2019 |  |  | 39 |
Amortization of the intangible assets - PPAs expected in 2020 |  |  | 70 |
Cash consideration |  | $ 1,020 |  |
Working capital |  | 12 |  |
Intangible assets – PPAs |  | 1,080 | 30 |
Goodwill |  | 14 | 11 |
Other non-current liabilities |  | 154 | 1 |
Property, plant and equipment – net |  | 400 | 50 |
Noncontrolling interest |  | $ 472 | $ 10 |
Ashtabula Wind II, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Membership interests acquired |  | 100.00% |  |
Generation facility capacity (mw) | MW |  | 120 |  |
Garden Wind, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Membership interests acquired |  | 100.00% |  |
Generation facility capacity (mw) | MW |  | 150 |  |
White Oak Energy Holdings, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Membership interests acquired |  | 100.00% |  |
White Oak Energy LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Membership interests acquired |  | 100.00% |  |
Generation facility capacity (mw) | MW |  | 150 |  |
Rosmar Holdings, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Membership interests acquired |  | 100.00% |  |
Generation facility capacity (mw) | MW |  | 132 |  |
Rosmar Holdings, LLC [Member] | Marshall And Roswell [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Noncontrolling ownership interest |  | 49.99% |  |
Number of solar generation facilities | solar_generation_facility |  | 2 |  |
Silver State South Solar, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Membership interests acquired |  | 49.99% |  |
Generation facility capacity (mw) | MW |  | 250 |  |
Meade Pipeline Co LLC [Member] | Meade Pipeline Investment, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Cash consideration | $ 1,280 |  |  |
Estimated future capital contributions | $ 90 |  |  |
Meade Pipeline Co LLC [Member] | Central Penn Line [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Noncontrolling ownership interest | 40.00% |  |  |
Additional Pipeline Volume Per Day | Bcf | 0.6 |  |  |
Length Of Natural Gas Pipeline | mi | 185 |  |  |
Natural Gas Pipeline, Transport And Deliver Volume | Bcf | 1,700,000,000 |  |  |
Meade Pipeline Co LLC [Member] | Central Penn Line [Member] | Meade Pipeline Investment, LLC [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Noncontrolling ownership interest | 39.20% |  |  |

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