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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Due from related parties	$ 91		$ 88	[1]
Revenue from related parties	2	$ 5
Transportation and Fuel Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue from related parties	2
NextEra Energy, Inc. [Member] | Management Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	18	16
NEER [Member] | Cash Sweep and Credit Support Agreement [Member]
Related Party Transaction [Line Items]
Interest expense	1	1
Due from related parties	$ 89		$ 87
Subsidiaries of NEER [Member] | Transportation and Fuel Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue from related parties		$ 5
NEP OpCo [Member] | NextEra Energy, Inc. [Member] | Management Services Agreement [Member]
Related Party Transaction [Line Items]
Management fee, percent of EBITDA	1.00%
Annual management fee	$ 4
Management fee, additional payment threshold, minimum EBITDA	4
NEER [Member] | Guarantees [Member]
Related Party Transaction [Line Items]
Related party obligations	66
NextEra Energy Capital Holdings [Member] | Guarantees and Letters of Credit [Member]
Related Party Transaction [Line Items]
Total amount of letters of credit	$ 624
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Carrying amount as of the balance sheet date of obligations due all related parties.

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Expenses recognized resulting from transactions (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

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