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Related Party Transactions (Details) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Related Party Transaction [Line Items]
Due from related parties	$ 34,000,000		$ 34,000,000		$ 219,000,000	[1]
Due to related party, noncurrent	18,000,000		18,000,000		19,000,000	[1]
Subsidiaries of NEER [Member] | Operations, Maintenance,and Administrative Services [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	1,000,000	$ 1,000,000	4,000,000	$ 3,000,000
Subsidiaries of NEER [Member] | Operations, Maintenance,and Administrative Services, as well as Payroll and Other Payments [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party			7,000,000		13,000,000
NextEra Energy, Inc. [Member] | Management Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	1,000,000	1,000,000	3,000,000	1,000,000
NEER [Member]
Related Party Transaction [Line Items]
Due to related party, noncurrent	16,000,000		16,000,000		16,000,000
NEER [Member] | Cash Sweep and Credit Support Agreement [Member]
Related Party Transaction [Line Items]
Interest expense	1,000,000	$ 1,000,000	2,000,000	$ 1,000,000
Due from related parties	34,000,000		34,000,000		$ 218,000,000
Palo Duro [Member]
Related Party Transaction [Line Items]
Related note receivable, noncurrent	$ 16,000,000		16,000,000
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	$ 4,000,000
Annual management fee, quarterly installments	1,000,000
Management fee, additional payment threshold, minimum EBITDA	4,000,000
NextEra Energy Capital Holdings [Member] | Guarantees and Letters of Credit [Member]
Related Party Transaction [Line Items]
Total amount of letters of credit	532,000,000		532,000,000
NEER [Member] | Guarantees [Member]
Related Party Transaction [Line Items]
Related party obligations	$ 53,000,000		53,000,000
NEER [Member] | Engineering, Procurement, and Construction Contracts [Member]
Related Party Transaction [Line Items]
Related party transaction			$ 24,000,000
[1] Prior-period financial information has been retrospectively adjusted as discussed in Note 2.

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