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Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018		Dec. 31, 2018
Related Party Transaction [Line Items]
Due from related parties	$ 527		$ 527			$ 68
Funding of debt payment			1,001	$ 74	[1]
Revenue from related parties (less than for the three months ended June 30, 2018)	2	$ 1	5	3
Transportation and Fuel Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue from related parties (less than for the three months ended June 30, 2018)	2	1	5	2
NextEra Energy, Inc. [Member] | Management Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	24	20	68	57
NEER [Member] | Cash Sweep and Credit Support Agreement [Member]
Related Party Transaction [Line Items]
Interest expense	1	$ 1	4	$ 3
Due from related parties	525		$ 525			$ 66
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
NEER [Member] | Guarantees [Member]
Related Party Transaction [Line Items]
Related party obligations	69		69
NextEra Energy Capital Holdings [Member] | Guarantees and Letters of Credit [Member]
Related Party Transaction [Line Items]
Total amount of letters of credit	$ 682		682
NextEra Energy Capital Holdings [Member] | Genesis Solar Funding, LLC [Member] | Genesis Solar Funding, LLC [Member]
Related Party Transaction [Line Items]
Funding of debt payment			$ 31
[1] Prior-period financial information has been retrospectively adjusted to include the adoption of an accounting standards update related to leases.

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