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Acquisitions - Supplemental Unaudited Pro forma Results of Operations (Details) - NEP Renewables, LLC [Member] - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Unaudited pro forma results of operations:
Pro forma revenues	$ 201	$ 701
Pro forma operating income	58	425
Pro forma net income	109	378
Pro forma net income attributable to NEP	$ 33	$ 244

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+ References

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-Publisher FASB
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