Acquisitions - Estimated Fair Value of Assets Acquired and Liabilities Assumed (Details) - NEP Renewables, LLC [Member] $ in Millions	Dec. 20, 2018 USD ($)
Business Acquisition [Line Items]
Total consideration transferred	$ 1,304
Identifiable assets acquired and liabilities assumed
Cash	17
Accounts receivable and prepaid expenses	25
Property, plant and equipment - net	1,675
Intangible assets – PPAs	610
Other non-current assets	13
Accounts payable, accrued expenses and other current liabilities	(13)
Long-term debt, including current portion	(37)
Other non-current liabilities	(38)
Noncontrolling interests at fair value	(941)
Total net identifiable assets, at fair value	$ 1,311