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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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