NextEra Energy Partners (NEP) 10-Q 23 Oct 18 2018 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	9 Months Ended
	Sep. 30, 2018shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q3
Entity Registrant Name	NEXTERA ENERGY PARTNERS, LP
Entity Central Index Key	1,603,145
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding	56,011,793

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
OPERATING REVENUES
Renewable energy sales		$ 124	$ 141		$ 449	$ 466
Texas pipelines service revenues		54	50		166	144
Total operating revenues		178	191		615	610
OPERATING EXPENSES (INCOME)
Operations and maintenance	[1]	65	61	[2]	193	184	[2]
Depreciation and amortization		49	56	[2]	152	169	[2],[3]
Loss (gain) on disposal of Canadian Holdings		0	0	[2]	(158)	0	[2],[3]
Taxes other than income taxes and other		5	5	[2]	15	15	[2]
Total operating expenses - net		119	122	[2]	202	368	[2]
OPERATING INCOME		59	69	[2]	413	242	[2]
OTHER INCOME (DEDUCTIONS)
Interest expense		31	(50)	[2]	(93)	(154)	[2]
Benefits associated with differential membership interests - net		0	21	[2]	0	83	[2],[3]
Equity in earnings of equity method investee		23	22	[2]	39	38	[2]
Equity in earnings of non-economic ownership interests		11	9	[2]	25	12	[2],[3]
Other - net		1	0	[2]	14	(2)	[2]
Total other income (deductions) - net		66	2	[2]	(15)	(23)	[2]
INCOME BEFORE INCOME TAXES		125	71	[2]	398	219	[2]
INCOME TAX EXPENSE		15	21	[2]	13	52	[2]
NET INCOME		110	50	[2]	385	167	[2],[3],[4],[5]
Net income attributable to preferred distributions		(6)	0	[2],[6]	(18)	0	[2],[6]
Less net income (loss) attributable to noncontrolling interest	[7]	(71)	(49)	[2]	(178)	(141)	[2]
NET INCOME ATTRIBUTABLE TO NEXTERA ENERGY PARTNERS, LP		$ 33	$ 1	[2]	$ 189	$ 26	[2]
Weighted average number of common units outstanding - basic (in shares)		54.9	54.3	[2]	54.5	54.2	[2]
Weighted average number of common units outstanding - assuming dilution (in shares)		74.6	54.3	[2]	74.2	54.2	[2]
Earnings per common unit attributable to NextEra Energy Partners, LP - basic (in dollars per share)		$ 0.60	$ 0.01	[2]	$ 3.47	$ 0.47	[2]
Earnings per common unit attributable to NextEra Energy Partners, LP - basic (in dollars per share)		0.58	0.01		3.25	0.47
Distributions per common unit (in dollars per unit)		$ 0.4375	$ 380,000	[2]	$ 1.2625	$ 1,097,500	[2]
[1]	Includes O&M expenses related to renewable energy projects of $31 million and $30 million for the three months ended September 30, 2018 and 2017, respectively, and $95 million and $94 million for the nine months ended September 30, 2018 and 2017, respectively. Includes O&M expenses related to the Texas pipelines of $11 million and $11 million for the three months ended September 30, 2018 and 2017, respectively, and $33 million and $33 million for the nine months ended September 30, 2018 and 2017, respectively. Total O&M expenses presented include related party amounts of $18 million and $22 million for the three months ended September 30, 2018 and 2017, respectively, and $66 million and $65 million for the nine months ended September 30, 2018 and 2017, respectively.
[2]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[3]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1 and Note 10 - Restricted Cash.
[4]	Net income attributable to noncontrolling interests includes the pre-acquisition net income of the common control acquisitions. See Note 1.
[5]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[6]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[7]	For the three and nine months ended September 30, 2017, net income attributable to noncontrolling interests includes the pre-acquisition net income of the common control acquisitions. See Note 1.

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Income Statement [Abstract]
Related party revenues	$ 1	$ 2	$ 3	$ 8
Operations and maintenance related to renewable energy projects	31	30	95	94
Operations and maintenance related to Texas pipelines	11	11	33	33
Operations and maintenance related party	$ 18	$ 22	$ 66	$ 65

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME		$ 110	$ 50	[1]	$ 385	$ 167	[1],[2],[3],[4]
OTHER COMPREHENSIVE INCOME, NET OF TAX
Reclassification from AOCI to net income (net of $1, $0, $2, and $2 tax expense, respectively)		(1)	1	[5]	1	4	[5]
Net unrealized gains (losses) on foreign currency translation (net of $0 tax benefit, $1 tax expense, $1 tax benefit, and $1 tax expense, respectively)		0	5	[5]	(6)	8	[5]
Other comprehensive income related to equity method investee (net of $2, $0, $2 and $0 tax benefit, respectively)		9	0	[5]	9	1	[5]
Total other comprehensive income, net of tax		8	6	[5]	4	13	[4],[5]
Impact of disposal of Canadian Holdings (net of $0, $0, $3, $0 tax expense, respectively)		0	0	[5]	107	0	[5]
COMPREHENSIVE INCOME		118	56	[5]	496	180	[5]
Net income attributable to preferred distributions		(6)	0	[1],[5]	(18)	0	[1],[5]
Less comprehensive income (loss) attributable to noncontrolling interest	[6]	(86)	(54)	[5]	(295)	(151)	[5]
COMPREHENSIVE INCOME ATTRIBUTABLE TO NEXTERA ENERGY PARTNERS, LP		$ 26	$ 2	[5]	$ 183	$ 29	[5]
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[2]	Net income attributable to noncontrolling interests includes the pre-acquisition net income of the common control acquisitions. See Note 1.
[3]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1 and Note 10 - Restricted Cash.
[4]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[5]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[6]	comprehensive income attributable to noncontrolling interests includes the pre-acquisition comprehensive income of the common control acquisitions. See Note 1.

Condensed Consolidated Statem_4

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	[1]	Sep. 30, 2018	Sep. 30, 2017	[1]
Statement of Comprehensive Income [Abstract]
Reclassification of unrealized losses on cash flow hedges from accumulated other comprehensive income to net income, tax expense	$ 1	$ 0		$ 2	$ 2
Unrealized gains (losses) on foreign currency translation, tax expense	0	1		(1)	1
Other comprehensive income (loss) related to equity method investee, tax (benefit) expense	(2)	0		(2)	0
Tax effect of gain (loss) from disposal	$ 0	$ 0		$ 3	$ 0
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 76	$ 154
Accounts receivable	73	85
Due from related parties	809	88
Restricted cash	15	25
Other current assets	36	46
Total current assets	1,009	398
Non-current assets:
Property, plant and equipment - net	5,132	6,197
Deferred income taxes	99	181
Intangible assets – customer relationships - net	648	661
Goodwill	584	628
Investment in equity method investee	235	218
Investments in non-economic ownership interests	30	11
Other non-current assets	113	101
Total non-current assets	6,841	7,997
TOTAL ASSETS	7,850	8,395
Current liabilities:
Accounts payable and accrued expenses	10	26
Due to related parties	42	45
Current maturities of long-term debt	64	99
Accrued interest	13	39
Other current liabilities	53	67
Total current liabilities	182	276
Non-current liabilities:
Long-term debt	3,491	4,218
Deferral related to differential membership interests	0	1,442
Deferred income taxes	10	63
Asset retirement obligation	70	81
Non-current due to related party	21	21
Other non-current liabilities	44	86
Total non-current liabilities	3,636	5,911
TOTAL LIABILITIES	3,818	6,187
COMMITMENTS AND CONTINGENCIES
EQUITY
Preferred units (14.0 units issued and outstanding)	548	548
Common units (56.0 and 54.3 units issued and outstanding, respectively)	1,845	1,639
Accumulated other comprehensive income (loss)	(5)	1
Noncontrolling interests	1,644	20
TOTAL EQUITY	4,032	2,208
TOTAL LIABILITIES AND EQUITY	$ 7,850	$ 8,395

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - shares shares in Millions	Sep. 30, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Preferred units issued	14	14
Preferred units outstanding	14	14
Common units issued	56	54.3
Common units outstanding	56	54.3

Condensed Consolidated Statem_5

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	[2]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 385	$ 167	[1],[3],[4]
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	152	169	[3]
Change in value of derivative contracts	(51)	18
Deferred income taxes	23	54
Benefits associated with differential membership interests - net	0	(83)	[3]
Equity in earnings of equity method investee, net of distributions received	(11)	(8)
Equity in earnings of non-economic ownership interests	(25)	(12)	[3]
Gain on disposal of Canadian Holdings	158	0	[3]
Other - net	(3)	9
Changes in operating assets and liabilities:
Accounts receivable	(9)	(1)
Other current assets	4	(7)
Other non-current assets	2	0
Accounts payable and accrued expenses	(19)	(1)
Due to related parties	0	(3)
Other current liabilities	(29)	(1)
Payment of acquisition holdback	0	(14)
Other non-current liabilities	8	6
Net cash provided by operating activities	269	293
CASH FLOWS FROM INVESTING ACTIVITIES
Acquisition of membership interests in subsidiaries	0	(242)
Capital expenditures	(10)	(342)
Proceeds from CITCs	0	77
Proceeds from the sale of Canadian Holdings - net	517	0
Payments to related parties under CSCS agreement - net	(720)	(301)
Net cash used in investing activities	(213)	(808)
CASH FLOWS FROM FINANCING ACTIVITIES
Proceeds from issuance of common units - net	81	0
Issuances of long-term debt	0	1,880
Retirements of long-term debt	(74)	(1,171)
Deferred financing costs	0	(21)
Capped call transaction	0	(12)
Partners/Members' contributions	32	307
Partners/Members' distributions	(205)	(232)
Preferred unit distributions	(15)	0
Proceeds from differential membership investors	56	34
Payments to differential membership investors	(16)	(19)
Change in amounts due to related parties	(1)	(78)
Payment of acquisition holdback	0	(186)
Net cash provided by (used in) financing activities	(142)	502
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(2)	1
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH	(88)	(12)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - BEGINNING OF PERIOD	198	191
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - END OF PERIOD	110	179
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Partners/Members' noncash distributions	17	0
Members’ noncash contributions for construction costs and other	0	11
Change in noncash investments in equity method investees - net	1	2
Accrued but not paid for capital and other expenditures	1	6
Payment of acquisition holdback	0	5
Accrued preferred distributions	$ 18	$ 0
[1]	Net income attributable to noncontrolling interests includes the pre-acquisition net income of the common control acquisitions. See Note 1.
[2]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1 and Note 10 - Restricted Cash.
[3]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[4]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Condensed Consolidated Statem_6

Condensed Consolidated Statements of Changes in Equity - USD ($) shares in Millions, $ in Millions		Total		Preferred Units [Member]	Preferred Partner [Member]	Units [Member]	Limited Partners [Member]		Accumulated Other Comprehensive Loss [Member]	Noncontrolling Interest [Member]
Beginning balance, units at Dec. 31, 2016						54.2
Beginning balance at Dec. 31, 2016		$ 2,566	[1]				$ 1,746		$ (3)	$ 823	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Related party note receivable	[2]	1								1
Capped call transaction		(12)	[1]				(12)
Acquisition of membership interests in subsidiaries	[1]	(242)								(242)
Limited partners/related party contribution and transition	[1]	11					6			5
Issuance of common units (in units)						0.1
Issuance of common units		1	[1]				1
Net income	[3]	167	[1],[4],[5]				26			141	[1]
Other comprehensive income (loss)		13	[1],[6]						3	10	[1]
Related party contributions	[1]	318								318
Related party distributions	[1]	(172)								(172)
Changes in non-economic ownership interests and equity method investee	[1]	(3)								(3)
Distributions to unitholders		(60)	[1]				(60)
Ending balance, units at Sep. 30, 2017						54.3
Ending balance at Sep. 30, 2017		2,588	[1]				1,707		0	881	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accrued preferred distributions	[4]	0
Net income	[5]	50
Other comprehensive income (loss)	[6]	6
Ending balance, units at Sep. 30, 2017						54.3
Ending balance at Sep. 30, 2017		$ 2,588	[1]				1,707		0	881	[1]
Beginning balance, units at Dec. 31, 2017		54.3		14		54.3
Beginning balance at Dec. 31, 2017		$ 2,208			$ 548		1,639		1	20
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Related party note receivable		31								31
Limited partners/related party contribution and transition		(2)	[2]				(2)	[1]
Issuance of common units (in units)						1.7
Issuance of common units		81	[2]				81
Net income		385			18		189			178
Other comprehensive income (loss)		4							(8)	12
Related party contributions	[2]	1								1
Related party distributions		(153)								(153)
Changes in non-economic ownership interests and equity method investee		(6)								(6)
Differential membership investment activity		40								40
Distributions to unitholders	[2]	(87)			(18)		(69)
Disposal of Canadian Holdings		107							2	105
Adoption of accounting standards update		$ 1,423					7			1,416
Ending balance, units at Sep. 30, 2018		56		14		56
Ending balance at Sep. 30, 2018		$ 4,032			548		1,845		(5)	1,644
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accrued preferred distributions		18
Net income		110
Other comprehensive income (loss)		$ 8
Ending balance, units at Sep. 30, 2018		56		14		56
Ending balance at Sep. 30, 2018		$ 4,032			$ 548		$ 1,845		$ (5)	$ 1,644
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accrued preferred distributions		$ 6
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[2]	At September 30, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in November 2018.
[3]	Net income attributable to noncontrolling interests includes the pre-acquisition net income of the common control acquisitions. See Note 1.
[4]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1 and Note 10 - Restricted Cash.
[5]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[6]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2018
Business Combinations [Abstract]
Acquisitions	Acquisitions During 2017, a subsidiary of NEP completed acquisitions from NEER which were transfers of assets between entities under common control that were required to be accounted for as if the transfers occurred since the inception of common control, with prior periods retrospectively adjusted to furnish comparative information. Accordingly, the accompanying condensed consolidated financial statements have been retrospectively adjusted for the three and nine months ended September 30, 2017 to include the historical results and financial position of the common control acquisitions prior to their respective acquisition dates. In August 2017, NEP and NEP GP implemented governance changes that, among other things, enhanced NEP unitholder governance rights. The new governance structure established a NEP board of directors whereby NEP unitholders have the ability to nominate and elect board members, subject to certain limitations and requirements. As a result of these governance changes, beginning in January 2018, acquisitions from NEER are no longer treated as common control acquisitions and NEP's financial statements will no longer be retrospectively adjusted for such acquisitions. In August 2018, an indirect subsidiary of NEP entered into an agreement with indirect subsidiaries of NEER to acquire NEP Renewables, LLC (NEP Renewables) which owns 100% of the membership interests in each of: • Breckinridge Wind Class A Holdings, LLC, which indirectly owns an approximately 98 MW wind generation facility located in Oklahoma; • Carousel Wind Holdings, LLC, which indirectly owns an approximately 150 MW wind generation facility located in Colorado; • Monarch Wind Holdings, LLC, which indirectly owns two wind generation facilities, Javelina II and Rush Springs Wind, with a combined generating capacity of approximately 450 MW, located in Texas and Oklahoma, respectively; • Mountain View Solar Holdings, LLC, which indirectly owns a 20 MW solar generation facility located in Nevada; • Pacific Plains Wind Class A Holdings, LLC, which indirectly owns three wind generation facilities, Bluff Point, Cottonwood and Golden Hills North, with a combined generating capacity of approximately 255 MW, located in Indiana, Nebraska and California, respectively; and • Palomino Wind Holdings, LLC, which indirectly owns three wind generation facilities located in Kansas, Kingman I, Kingman II and Ninnescah, with a combined generating capacity of approximately 415 MW. NEP expects to complete the acquisition before December 31, 2018, subject to customary closing conditions and the receipt of certain regulatory approvals, for a total consideration of approximately $1,275 million , subject to customary working capital and other adjustments, plus the assumption of approximately $930 million in existing noncontrolling interests related to differential membership investors and $38 million of existing debt.

Revenue

Revenue	9 Months Ended
	Sep. 30, 2018
Revenue from Contract with Customer [Abstract]
Revenue	Revenue Effective January 1, 2018, NEP adopted an accounting standards update that provides guidance on the recognition of revenue from contracts with customers and requires additional disclosures regarding such contracts (new revenue standard). Under the new revenue standard, revenue is recognized when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. NEP adopted the new revenue standard using the modified retrospective approach applying it only to contracts that were not complete at January 1, 2018. NEP did not recognize a cumulative effect adjustment on January 1, 2018 because revenue recognized under the new accounting standard remained consistent with historical practice. NEP's operating revenues are generated primarily from various non-affiliated parties under long-term power purchase agreements, FIT agreements and RESOP agreements (collectively, PPAs) and natural gas transportation agreements. Revenue is recognized as energy and any related renewable energy attributes are delivered, based on rates stipulated in the respective PPAs, or natural gas transportation services are performed. NEP believes that the obligation to deliver energy and provide the natural gas transportation services is satisfied over time as the customer simultaneously receives and consumes benefits provided by NEP. In addition, NEP believes that the obligation to deliver renewable energy attributes is satisfied at multiple points in time, with the control of the renewable energy attribute being transferred at the same time the related energy is delivered. Substantially all of the PPAs are accounted for as operating leases and are not considered contracts with customers within the scope of the new revenue standard. Included in NEP’s operating revenues for the three months ended September 30, 2018 is approximately $11 million and $52 million and for the nine months ended September 30, 2018 is $40 million and $162 million of revenue from contracts with customers for renewable energy sales and natural gas transportation services, respectively. NEP's accounts receivable are primarily associated with revenues earned from contracts with customers as well as lease transactions. Receivables represent unconditional rights to consideration and reflect the differences in timing of revenue recognition and cash collections. For substantially all of NEP's receivables, regardless of the type of revenue transaction from which the receivable originated, customer and counterparty credit risk is managed in the same manner and the terms and conditions of payment are similar. NEP recognizes revenues as energy and any related renewable energy attributes are delivered or natural gas transportation services are performed, consistent with the amounts billed to customers based on rates stipulated in the respective PPAs. NEP considers the amount billed to represent the value of energy delivered or services provided to the customer. NEP’s customers typically receive bills monthly with payment due within 30 days. The contracts with customers related to pipeline service revenues contain a fixed price related to firm natural gas transportation capacity with maturity dates ranging from 2018 to 2035. At September 30, 2018 , NEP expects to record approximately $1.9 billion of revenues over the remaining terms of the related contacts as the capacity is provided. Revenues yet to be earned under contracts with customers to deliver energy and any related energy attributes, which have maturity dates ranging from 2030 to 2035, will vary based on the volume of energy delivered.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For periods through December 31, 2017, when NEP acquired a NEER project, income taxes were calculated on the predecessor method using the separate return method applied to the group of renewable energy projects acquired. As a result of the governance changes discussed in Note 1, beginning in January 2018, acquisitions from NEER are no longer treated as common control acquisitions, and income taxes are calculated on the successor method where taxes are calculated for NEP as a single taxpaying corporation for U.S. federal and state income taxes (based on its election to be taxed as a corporation). Because NEP OpCo is a limited partnership, NEP only recognizes in income its applicable ownership share of U.S. income taxes related to the U.S. projects and, prior to the sale of Canadian Holdings, the Canadian projects. NEP's former Canadian subsidiaries were all Canadian taxpayers, and therefore NEP recognized in income all of the Canadian taxes. Income taxes include NEP's applicable ownership share of U.S. taxes and 100% of Canadian taxes. Net income or loss attributable to noncontrolling interests includes no U.S. taxes and NEER's applicable ownership share of Canadian taxes. Net income attributable to NEP includes NEP's applicable ownership share of U.S. and Canadian taxes. On December 22, 2017, the Tax Cuts and Jobs Act (tax reform) was signed into law which, among other things, reduced the federal corporate income tax rate from 35% to 21% effective January 1, 2018. As a result, NEP performed an analysis to preliminarily revalue its deferred income taxes and included an estimate of changes in the balances in NEP's December 31, 2017 financial statements. At December 31, 2017, the revaluation reduced NEP’s net deferred income tax assets by approximately $101 million , which decreased NEP’s 2017 net income and net income attributable to NEP. While NEP continues to believe that the provisional tax reform adjustment is a reasonable estimate of the effects on its existing deferred taxes, additional analysis and detailed reviews are still being performed to finalize the accounting for the remeasurement of deferred tax assets and liabilities as a result of the enactment of tax reform. NEP expects any final adjustments to the provisional amounts to be recorded in the fourth quarter of 2018 upon filing of all 2017 income tax returns. The effective tax rates for the three months ended September 30, 2018 and 2017 were approximately 12% and 30% , respectively, and for the nine months ended September 30, 2018 and 2017 were approximately 3% and 24% , respectively. The effective tax rate is affected by recurring items, such as the relative amount of income earned in jurisdictions (earnings mix), valuation allowances on deferred tax assets, taxes attributable to the noncontrolling interests and the taxation of Canadian income in both Canada and the U.S. During the nine months ended September 30, 2018 , the disposal of Canadian Holdings (see Note 10 - Disposal of Canadian Holdings) resulted in an overall tax benefit of approximately $47 million . The benefit resulted from the removal of the historical Canadian deferred tax liabilities of approximately $69 million offset by US tax expense of $22 million related to the gain. During the nine months ended September 30, 2018 , NEP recorded an income tax charge of approximately $20 million related to the $231 million adjustment to differential membership interests as a result of the change in federal corporate income taxes due to tax reform that became effective January 1, 2018 (see Note 10 - Accounting for Partial Sales of Nonfinancial Assets).

Fair Value Measurements

Fair Value Measurements	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Fair Value Measurements	Fair Value Measurements The fair value of assets and liabilities are determined using either unadjusted quoted prices in active markets (Level 1) or pricing inputs that are observable (Level 2) whenever that information is available and using unobservable inputs (Level 3) to estimate fair value only when relevant observable inputs are not available. NEP uses several different valuation techniques to measure the fair value of assets and liabilities relying primarily on the market approach of using prices and other market information for identical and/or comparable assets and liabilities for those assets and liabilities that are measured at fair value on a recurring basis. Certain financial instruments may be valued using multiple inputs including discount rates, counterparty credit ratings and credit enhancements. NEP’s assessment of the significance of any particular input to the fair value measurement requires judgment and may affect the placement of those assets and liabilities within the fair value hierarchy levels. Non-performance risk, including the consideration of a credit valuation adjustment, is also considered in the determination of fair value for all assets and liabilities measured at fair value. Transfers between fair value hierarchy levels occur at the beginning of the period in which the transfer occurred. Cash Equivalents and Restricted Cash Equivalents - The fair value of money market funds that are included in cash and cash equivalents, restricted cash and other non-current assets on the condensed consolidated balance sheets is estimated using a market approach based on current observable market prices. Interest Rate and Foreign Currency Contracts - NEP estimates the fair value of its derivatives using an income approach based on a discounted cash flows valuation technique utilizing the net amount of estimated future cash inflows and outflows related to the agreements. The primary inputs used in the fair value measurements include the contractual terms of the derivative agreements, current interest rates, foreign currency exchange rates and credit profiles. The significant inputs for the resulting fair value measurement are market-observable inputs and the measurements are reported as Level 2 in the fair value hierarchy. NEP’s financial assets and liabilities and other fair value measurements made on a recurring basis by fair value hierarchy level are as follows: September 30, 2018 December 31, 2017 Level 1 Level 2 Total Level 1 Level 2 Total (millions) Assets: Cash equivalents $ 45 $ — $ 45 $ 61 $ — $ 61 Restricted cash equivalents (a) 24 — 24 31 — 31 Interest rate contracts — 81 81 — 15 15 Total assets $ 69 $ 81 $ 150 $ 92 $ 15 $ 107 Liabilities: Interest rate contracts $ — $ 57 $ 57 $ — $ 44 $ 44 Foreign currency contracts — — — — 3 3 Total liabilities $ — $ 57 $ 57 $ — $ 47 $ 47 ____________________ (a) At September 30, 2018 and December 31, 2017 , approximately $9 million and $7 million , respectively, of restricted cash equivalents are included in other non-current assets on NEP's condensed consolidated balance sheets. Financial Instruments Recorded at Other than Fair Value - The carrying amount of short-term debt approximates its fair value. The carrying amounts and estimated fair values of other financial instruments recorded at other than fair value are as follows: September 30, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value (millions) Long-term debt, including current maturities (a) $ 3,555 $ 3,512 $ 4,317 $ 4,456 ____________________ (a) At September 30, 2018 and December 31, 2017 , approximately $3,036 million and $3,552 million , respectively, of the fair value is estimated using a market approach based on quoted market prices for the same or similar issues (Level 2); the balance is estimated using an income approach utilizing a discounted cash flow valuation technique, considering the current credit profile of the debtor (Level 3).

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activity	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activity	Derivative Instruments and Hedging Activity NEP uses derivative instruments (primarily interest rate swaps) to manage the interest rate cash flow risk associated primarily with outstanding and expected future debt issuances and borrowings. NEP records all derivative instruments that are required to be marked to market as either assets or liabilities in its condensed consolidated balance sheets and measures them at fair value each reporting period. NEP does not utilize hedge accounting for its derivative instruments. All changes in the derivatives' fair value are recognized in interest expense in the condensed consolidated statements of income. In general, the commencement and termination dates of the interest rate swap agreements and the related hedging relationship coincide with the corresponding dates of the underlying variable-rate debt instruments. At September 30, 2018 and December 31, 2017 , the combined notional amounts of the interest rate contracts were approximately $8,222 million and $3,609 million , respectively. At September 30, 2018 , NEP's AOCI included amounts related to discontinued cash flow hedges, which have expiration dates through 2030. At September 30, 2018 , less than $1 million of net unrealized losses are expected to be reclassified into interest expense within the next 12 months as interest payments are made. Such amount assumes no change in scheduled principal payments. Cash flows from these interest rate swap contracts are reported in cash flows from operating activities in the condensed consolidated statements of cash flows. Prior to the sale of Canadian Holdings discussed in Note 10 - Disposal of Canadian Holdings, NEP entered into certain foreign currency exchange contracts to economically hedge its cash flows from foreign currency rate fluctuations. At December 31, 2017 , the notional amount of the foreign currency contracts was approximately $62 million . During the three months ended September 30, 2018 and 2017 , NEP recorded less than $1 million of losses and $2 million of losses , respectively, and $13 million of gains and $5 million of losses during the nine months ended September 30, 2018 and 2017 , respectively, related to the foreign currency contracts in other - net in the condensed consolidated statements of income. In April 2018, NEP entered into a foreign exchange forward agreement with a notional amount of CAD $741 million to manage foreign currency exchange rate risk associated with the cash consideration NEP received upon closing of the sale of Canadian Holdings. In July 2018, the CAD $741 million hedge agreement was settled. Fair Value of Derivative Instruments - The tables below present NEP's gross derivative positions, based on the total fair value of each derivative instrument, at September 30, 2018 and December 31, 2017 , as required by disclosure rules, as well as the location of the net derivative positions, based on the expected timing of future payments, on the condensed consolidated balance sheets. September 30, 2018 Gross Basis Net Basis Assets Liabilities Assets Liabilities (millions) Interest rate contracts $ 81 $ 57 $ 41 $ 17 Net fair value by balance sheet line item: Other current assets $ 8 Other non-current assets 33 Other current liabilities $ — Other non-current liabilities 17 Total derivatives $ 41 $ 17 December 31, 2017 Gross Basis Net Basis Assets Liabilities Assets Liabilities (millions) Interest rate contracts $ 15 $ 44 $ 18 $ 47 Foreign currency contracts — 3 — 3 Total fair values $ 15 $ 47 $ 18 $ 50 Net fair value by balance sheet line item: Other current assets $ 10 Other non-current assets 8 Other current liabilities $ 11 Other non-current liabilities 39 Total derivatives $ 18 $ 50 Financial Statement Impact of Derivative Instruments - Gains (losses) related to NEP's interest rate contracts are recorded in the condensed consolidated financial statements as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (millions) Interest rate contracts: Losses reclassified from AOCI to interest expense $ — $ (1 ) $ (3 ) $ (6 ) Gains (losses) recognized in interest expense $ 74 $ (1 ) $ 55 $ (21 ) Credit-Risk-Related Contingent Features - Certain of NEP's derivative instruments contain credit-related cross-default and material adverse change triggers, none of which contain requirements to maintain certain credit ratings or financial ratios. At September 30, 2018 and December 31, 2017 , the aggregate fair value of NEP's derivative instruments with contingent risk features that were in a liability position was approximately $57 million and $17 million , respectively.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Variable Interest Entities	Variable Interest Entities NEP has identified NEP OpCo as a VIE. NEP OpCo is a limited partnership with a general partner and limited partners. NEP has consolidated the results of NEP OpCo and its subsidiaries because of its controlling interest in the general partner of NEP OpCo. At September 30, 2018 , NEP owned an approximately 35.6% limited partner interest in NEP OpCo and NEE Equity owned a noncontrolling 64.4% limited partner interest in NEP OpCo (NEE's noncontrolling interest). The assets and liabilities of NEP OpCo as well as the operations of NEP OpCo represent substantially all of NEP's assets and liabilities and its operations. In addition, at September 30, 2018 , NEP OpCo consolidated seven VIEs related to certain subsidiaries that have sold differential membership interests in entities which own and operate ten wind electric generation facilities. These entities are considered VIEs because the holders of the differential membership interests do not have substantive rights over the significant activities of these entities. The assets, primarily property, plant and equipment - net, and liabilities, primarily asset retirement obligation and non-current due to related party, of the VIEs, totaled approximately $2,775 million and $75 million , respectively, at September 30, 2018 . The assets, primarily property, plant and equipment - net, and liabilities, primarily deferral related to differential membership interests, totaled approximately $2,840 million and $1,515 million , respectively, at December 31, 2017 . In April 2015, a subsidiary of NEP made an equity method investment in three NEER solar projects. Through a series of transactions, a subsidiary of NEP issued 1,000,000 NEP OpCo Class B Units, Series 1 and 1,000,000 NEP OpCo Class B Units, Series 2, to NEER for approximately 50% of the ownership interests in the three solar projects (non-economic ownership interests). NEER, as holder of the Class B Units, will retain 100% of the economic rights in the projects to which the respective Class B Units relate, including the right to all distributions paid by the project subsidiaries. NEER has agreed to indemnify NEP against all risks relating to NEP’s ownership of the projects until NEER offers to sell economic interests to NEP and NEP accepts such offer, if NEP chooses to do so. NEER has also agreed to continue to manage the operation of the projects at its own cost, and to contribute to the projects any capital necessary for the operation of the projects, until NEER offers to sell economic interests to NEP and NEP accepts such offer. At September 30, 2018 and December 31, 2017 , NEP's equity method investment related to the non-economic ownership interests is reflected as investments in non-economic ownership interests on the condensed consolidated balance sheets. All equity in earnings of the non-economic ownership interests is allocated to net income attributable to noncontrolling interests. NEP is not the primary beneficiary and therefore does not consolidate these entities because it does not control any of the ongoing activities of these entities, was not involved in the initial design of these entities and does not have a controlling interest in these entities.

Capitalization

Capitalization	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Capitalization	Capitalization Equity - During the nine months ended September 30, 2018 , NEP issued approximately 1.7 million common units under its $150 million at-the-market equity issuance program (ATM program) implemented in July 2018, which replaced its prior program, for gross proceeds of approximately $82 million . Fees related to the ATM program totaled approximately $1 million in 2018. On October 22, 2018 , the board of directors of NEP authorized a distribution of $ 0.45 per common unit payable on November 14, 2018 to its common unitholders of record on November 6, 2018 . In August 2018, NEP, NEP Renewables Holdings, LLC (NEP Renewables Holdings) and NEP Renewables entered into a membership interest purchase agreement (membership purchase agreement) with a third-party investor (Class B purchaser) for the purpose of financing the acquisition of NEP Renewables. The Class B purchaser has committed to pay approximately $750 million to NEP Renewables Holdings for 100% of the noncontrolling Class B interest in NEP Renewables, representing an approximately 59% investment in NEP Renewables, subject to certain conditions. NEP Renewables Holdings will retain 100% of the Class A interest, representing an approximately 41% investment in NEP Renewables. NEP will consolidate NEP Renewables which will be considered a VIE because the Class B purchaser does not have substantive rights over the significant activities of NEP Renewables. Under the amended and restated limited liability company agreement for NEP Renewables (the LLC agreement) that will be entered into at funding, NEP will receive 85% of NEP Renewables’ cash distributions for the first three years after funding, and the Class B purchaser will receive 15% . After three years , NEP will receive 20% of NEP Renewables’ cash distributions and the Class B purchaser will receive 80% . From the third to the fourth anniversary after funding, NEP has the option (the buyout right), subject to certain limitations and extensions, to purchase 100% of the Class B purchaser’s interest in NEP Renewables at a buyout price that implies a 7.75% pre-tax return to the Class B purchaser (inclusive of all prior distributions). If exercised, NEP has the right to pay at least 70% of the buyout price in NEP non-voting common units, issued at the then-current market price of NEP common units, with the balance paid in cash, subject to certain limitations. Beginning January 1, 2025, NEP will give the Class B purchaser, under a registration rights agreement to be entered into at funding, certain rights to require NEP, under certain circumstances, to initiate underwritten offerings for the common units that are issuable if NEP exercises the buyout right. NEP's limited partnership agreement will be amended and restated to establish the rights of the NEP non-voting common units. The NEP non-voting common units will have, among other terms, the right to receive pro rata quarterly cash distributions and rights, subject to certain limitations, to convert the NEP non-voting common units into NEP common units on a one-for-one basis. Earnings Per Unit - Diluted earnings per unit are based on the weighted-average number of common units and potential common units outstanding during the period, including the dilutive effect of the convertible notes and preferred units. The dilutive effect of the convertible notes and preferred units is computed using the if-converted method. The reconciliation of NEP's basic and diluted earnings per unit is as follows: Three Months Ended Nine Months Ended (millions, except per unit amounts) Numerator: Net income attributable to NEP – basic $ 33 $ 189 Adjustments for convertible notes and preferred units 10 52 Net income attributable to NEP used to compute diluted earnings per unit $ 43 $ 241 Denominator: Weighted-average number of common units outstanding – basic 54.9 54.5 Convertible notes and preferred units 19.7 19.7 Weighted-average number of common units outstanding – assuming dilution 74.6 74.2 Earnings per unit attributable to NEP: Basic $ 0.60 $ 3.47 Assuming dilution $ 0.58 $ 3.25

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Accumulated Other Comprehensive (Income) Loss	Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Three months ended September 30, 2018 Balances, June 30, 2018 $ 6 $ (30 ) $ (24 ) Amounts reclassified from AOCI to interest expense (1 ) — (1 ) Other comprehensive income related to equity method investee — 9 9 Net other comprehensive income (loss) (1 ) 9 8 Balances, September 30, 2018 $ 5 $ (21 ) $ (16 ) AOCI attributable to noncontrolling interest $ 4 $ (15 ) $ (11 ) AOCI attributable to NEP $ 1 $ (6 ) $ (5 ) Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Nine months ended September 30, 2018 Balances, December 31, 2017 $ 1 $ (98 ) $ (30 ) $ (127 ) Amounts reclassified from AOCI to interest expense 1 — — 1 Net unrealized losses on foreign currency translation — (6 ) — (6 ) Other comprehensive income related to equity method investee — — 9 9 Net other comprehensive income (loss) 1 (6 ) 9 4 Impact of disposal of Canadian Holdings 3 104 — 107 Balances, September 30, 2018 $ 5 $ — $ (21 ) $ (16 ) AOCI attributable to noncontrolling interest $ 4 $ — $ (15 ) $ (11 ) AOCI attributable to NEP $ 1 $ — $ (6 ) $ (5 ) Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Three months ended September 30, 2017 Balances, June 30, 2017 $ (1 ) $ (102 ) $ (34 ) $ (137 ) Amounts reclassified from AOCI to interest expense 1 — — 1 Net unrealized gains on foreign currency translation — 5 — 5 Net other comprehensive income 1 5 — 6 Balances, September 30, 2017 $ — $ (97 ) $ (34 ) $ (131 ) AOCI attributable to noncontrolling interest $ (1 ) $ (95 ) $ (35 ) $ (131 ) AOCI attributable to NEP $ 1 $ (2 ) $ 1 $ — Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Nine months ended September 30, 2017 Balances, December 31, 2016 $ (4 ) $ (105 ) $ (35 ) $ (144 ) Amounts reclassified from AOCI to interest expense 4 — — 4 Net unrealized gains on foreign currency translation — 8 — 8 Other comprehensive income related to equity method investee — — 1 1 Net other comprehensive income 4 8 1 13 Balances, September 30, 2017 $ — $ (97 ) $ (34 ) $ (131 ) AOCI attributable to noncontrolling interest $ (1 ) $ (95 ) $ (35 ) $ (131 ) AOCI attributable to NEP $ 1 $ (2 ) $ 1 $ —

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2018
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Each project entered into O&M agreements and ASAs with subsidiaries of NEER whereby the projects pay a certain annual fee plus actual costs incurred in connection with certain O&M and administrative services performed under these agreements. These services are reflected as operations and maintenance in the condensed consolidated statements of income. Additionally, a NEP subsidiary pays an affiliate for transmission services which are reflected as operations and maintenance in the condensed consolidated statements of income. Certain projects have also entered into various types of agreements including those related to shared facilities and transmission lines, transmission line easements, technical support and construction coordination with subsidiaries of NEER whereby certain fees or cost reimbursements are paid to, or received by, certain subsidiaries of NEER. Management Services Agreement - Under the MSA, an indirect wholly owned subsidiary of NEE provides operational, management and administrative services to NEP, including managing NEP’s day-to-day affairs and providing individuals to act as NEP’s executive officers and directors, in addition to those services that are provided under the existing O&M agreements and ASAs described above between NEER subsidiaries and NEP subsidiaries. NEP OpCo pays NEE an annual management fee equal to the greater of 1% of the sum of NEP OpCo’s net income plus interest expense, income tax expense and depreciation and amortization expense less certain non-cash, non-recurring items for the most recently ended fiscal year and $4 million (as adjusted for inflation beginning in 2016), which is paid in quarterly installments with an additional payment each January to the extent 1% of the sum of NEP OpCo’s net income plus interest expense, income tax expense and depreciation and amortization expense less certain non-cash, non-recurring items for the preceding fiscal year exceeds $4 million (as adjusted for inflation beginning in 2016). NEP OpCo also makes certain payments to NEE based on the achievement by NEP OpCo of certain target quarterly distribution levels to its unitholders. NEP’s O&M expenses for the three and nine months ended September 30, 2018 include approximately $20 million and $57 million , respectively, and for the three and nine months ended September 30, 2017 include approximately $17 million and $49 million , respectively, related to the MSA. Cash Sweep and Credit Support Agreement - NEP OpCo is a party to the CSCS agreement with NEER under which NEER and certain of its subsidiaries may provide credit support in the form of letters of credit and guarantees to satisfy NEP’s subsidiaries’ contractual obligations. NEP OpCo will pay NEER an annual credit support fee based on the level and cost of the credit support provided, payable in quarterly installments. NEP’s O&M expenses for the three and nine months ended September 30, 2018 include approximately $1 million and $3 million , respectively, and for the three and nine months ended September 30, 2017 include approximately $1 million and $3 million , respectively, related to the CSCS agreement. NEER and certain of its subsidiaries may withdraw funds (Project Sweeps) received by NEP OpCo under the CSCS agreement, or its subsidiaries in connection with certain long-term debt agreements, and hold those funds in accounts belonging to NEER or its subsidiaries to the extent the funds are not required to pay project costs or otherwise required to be maintained by NEP's subsidiaries. NEER and its subsidiaries may keep the funds until the financing agreements permit distributions to be made, or, in the case of NEP OpCo, until such funds are required to make distributions or to pay expenses or other operating costs or NEP OpCo otherwise demands the return of such funds. If NEER fails to return withdrawn funds when required by NEP's subsidiaries’ financing agreements, the lenders will be entitled to draw on any credit support provided by NEER in the amount of such withdrawn funds. If NEER or one of its affiliates realizes any earnings on the withdrawn funds prior to the return of such funds, it will be permitted to retain those earnings. At September 30, 2018 and December 31, 2017 , the cash sweep amounts held in accounts belonging to NEER or its subsidiaries were approximately $807 million and $87 million , respectively, and are included in due from related parties on the condensed consolidated balance sheets. Guarantees and Letters of Credit Entered into by Related Parties - Certain PPAs include requirements of the project entities to meet certain performance obligations. NEECH or NEER has provided letters of credit or guarantees for certain of these performance obligations and payment of any obligations from the transactions contemplated by the PPAs . In addition, certain financing agreements require cash and cash equivalents to be reserved for various purposes . In accordance with the terms of these financing agreements, guarantees from NEECH have been substituted in place of these cash and cash equivalents reserve requirements. Also, under certain financing agreements, indemnifications have been provided by NEECH. In addition, certain interconnection agreements and site certificates require letters of credit or a bond to secure certain payment or restoration obligations related to those agreements. NEECH also guarantees the Project Sweep amounts held in accounts belonging to NEER, as described above. At September 30, 2018 , NEECH or NEER guaranteed or provided indemnifications, letters of credit or bonds totaling approximately $575 million related to these obligations. Agreements related to the sale of differential membership interests require NEER to guarantee payments due by the VIEs and the indemnifications to the VIEs' respective investors. At September 30, 2018 , NEER guaranteed a total of approximately $59 million related to these obligations. Due to Related Party - Non-current amounts due to related party on the condensed consolidated balance sheets primarily represent amounts owed by certain of NEP's wind projects to NEER to refund NEER for certain transmission costs paid on behalf of the wind projects. Amounts will be paid to NEER as the wind projects receive payments from third parties for related notes receivable recorded in other non-current assets on the condensed consolidated balance sheets. Transportation and Fuel Management Agreements - In connection with the Texas pipelines acquisition, a subsidiary of NEP assigned to a subsidiary of NEER certain gas commodity agreements in exchange for entering into transportation agreements and a fuel management agreement whereby the benefits of the gas commodity agreements (net of transportation paid to the NEP subsidiary) are passed back to the NEP subsidiary. During the three and nine months ended September 30, 2018 , NEP recognized less than $1 million and approximately $2 million , respectively, and for the three and nine months ended September 30, 2017 NEP recognized $2 million and $7 million , respectively, in revenues related to the transportation and fuel management agreements.

Summary of Significant Accounti

Summary of Significant Accounting and Reporting Policies	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting and Reporting Policies	Summary of Significant Accounting and Reporting Policies Restricted Cash - In the fourth quarter of 2017, NEP early adopted an accounting standards update which requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the condensed consolidated statements of cash flows. NEP adopted the standards update retrospectively, which adoption did not have a material impact to the condensed consolidated statements of cash flows. Current restricted cash on NEP's condensed consolidated balance sheets and approximately $19 million and $19 million of other non-current assets on NEP's condensed consolidated balance sheets at September 30, 2018 and December 31, 2017 , respectively, are held by certain subsidiaries to pay for certain capital or operating expenditures, as well as to fund required equity contributions pursuant to restrictions contained in the subsidiaries' debt agreements. Restricted cash reported as current assets are recorded as such based on the anticipated use of these funds. Disposal of Canadian Holdings - In June 2018, a subsidiary of NEP completed the sale of Canadian Holdings for cash proceeds of approximately CAD $740 million (USD $563 million at June 29, 2018), subject to post-closing working capital adjustments. In addition, the purchaser assumed approximately $676 million of existing debt. Canadian Holdings owned four wind generation facilities and two solar generation facilities located in Ontario, Canada with a generating capacity totaling approximately 396 MW. NEP recognized a gain of approximately $158 million ( $205 million after-tax). Income before income taxes associated with Canadian Holdings, excluding the financial statement impacts resulting from the sale in 2018, was approximately $8 million for the three months ended September 30, 2017 and $47 million and $47 million for the nine months ended September 30, 2018 and 2017, respectively. Accounting for Partial Sales of Nonfinancial Assets - Effective January 1, 2018, NEP adopted an accounting standards update regarding the accounting for partial sales of nonfinancial assets using the modified retrospective approach. This standards update affects the accounting and related financial statement presentation for the sales of differential membership interests to third-party investors. The primary impact of adopting the standards update was an increase to noncontrolling interests which includes the reclassification of the $1,442 million liability reflected as deferral related to differential membership interests on NEP's condensed consolidated balance sheets at December 31, 2017. See the condensed consolidated statements of changes in equity. During the three and nine months ended September 30, 2018 , approximately $28 million and $105 million , respectively, was recorded as net loss attributable to noncontrolling interests in NEP's condensed consolidated statements of income as the third-party investors received their portion of the economic attributes of the related facilities. Prior to the adoption, the income related to differential membership interests was being recognized in benefits associated with differential membership interests - net in NEP's condensed consolidated statements of income. Additionally, net loss attributable to noncontrolling interests for the nine months ended September 30, 2018 includes approximately $231 million (after-tax $211 million ) related to the reduction of differential membership interests as a result of the change in federal corporate income tax rates effective January 1, 2018. Noncontrolling Interests - At September 30, 2018 and December 31, 2017 , NEP's limited partner interest in NEP OpCo was approximately 35.6% and 34.9% , respectively. At September 30, 2018 , NEE's 64.4% noncontrolling interest in NEP OpCo, a non-affiliated party's 10% interest in one of the Texas pipelines and the interests related to differential membership interests discussed above are reflected as noncontrolling interests on the condensed consolidated balance sheets. Details of the activity in noncontrolling interests for the nine months ended September 30, 2018 is below: Differential Membership Interests Noncontrolling Ownership Interests in NEP OpCo and Texas pipeline Total Noncontrolling (millions) Balances, December 31, 2017 $ — $ 20 $ 20 Related party note receivable — 31 31 Net income (loss) attributable to NCI (336 ) (a) 514 178 Other comprehensive income — 12 12 Related party contributions — 1 1 Related party distributions — (153 ) (153 ) Changes in non-economic ownership interests and equity method investee — (6 ) (6 ) Differential membership investment contributions, net of distributions 40 — 40 Disposal of Canadian Holdings — 105 105 Adoption of accounting standards update 1,413 3 1,416 Balances, September 30, 2018 $ 1,117 $ 527 $ 1,644 ____________________ (a) Represents the benefits associated with differential membership interests recognized as the third-party investors received their portion of the economic attributes of the related facilities. Approximately $219 million of the loss attributable to differential membership interests benefits NEE's noncontrolling interest and $117 million is reflected as net income attributable to NEP. Leases - In February 2016, the Financial Accounting Standards Board (FASB) issued an accounting standards update which requires, among other things, that lessees recognize a lease liability, initially measured at the present value of the future lease payments, and a right-of-use asset for all leases (with the exception of short-term leases) (new lease standard). The new lease standard also requires new qualitative and quantitative disclosures for both lessees and lessors. The new lease standard will be effective for NEP beginning January 1, 2019. Early adoption is permitted. The new lease standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as an adjustment to retained earnings as of the date of initial application. NEP is currently reviewing its portfolio of contracts and evaluating the proper application of the new lease standard to these contracts in order to determine the impact the adoption will have on its consolidated financial statements. NEP is implementing a number of system enhancements to facilitate the identification, tracking and reporting of leases based upon the requirements of the new lease standard. NEP is continuing to assess the transition options and practical expedients and monitoring industry implementation issues.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contracts - At September 30, 2018 , NEP and its subsidiaries have entered into contracts with expiration dates ranging from 2018 through 2065 for the sale of differential membership interests related to certain wind generation facilities, engineering, procurement and construction contracts and agreements that provide for the right to use the land upon which certain projects are located. At September 30, 2018 , payments under these contracts were estimated as follows: Year Ending December 31, Commitments (millions) Remainder of 2018 $ 9 2019 32 2020 32 2021 32 2022 33 Thereafter 455 Total estimated payments $ 593 One of NEP’s solar project's land use agreements includes a right-of-way lease/grant that provides for payments to the BLM for the right to use the public lands upon which the project is located. The lease may be renewed at expiration at the solar project's option and will be subject to the regulations existing at the time of renewal. In connection with the terms of the lease, the solar project obtained a surety bond from a non-affiliated party in favor of the BLM for approximately $23 million . The surety bond remains in effect until the BLM is satisfied that there is no outstanding liability on the bond or satisfactory replacement bond coverage is furnished. Letter of Credit Facilities - Two of NEP’s projects entered into letter of credit (LOC) facilities under which the LOC lenders may issue standby letters of credit not to exceed approximately $82 million in the aggregate. These LOC facilities have maturity dates of June 2022 and July 2022. At September 30, 2018 , approximately $68 million of LOCs was outstanding primarily related to debt service reserves and as security for certain of the projects' agreements, including a PPA. Acquisition Holdback - At December 31, 2016, the condensed consolidated balance sheets included an acquisition holdback related to the satisfaction of any indemnification obligations of the Texas pipelines sellers through April 2017 (indemnity holdback). During the nine months ended September 30, 2017 the indemnity holdback was released under the terms of the Texas pipelines acquisition agreement and approximately $200 million was paid to the sellers.

Summary of Significant Accoun_2

Summary of Significant Accounting and Reporting Policies (Policies)	9 Months Ended
	Sep. 30, 2018
Accounting Policies [Abstract]
Recently Issued Accounting Guidance	Effective January 1, 2018, NEP adopted an accounting standards update that provides guidance on the recognition of revenue from contracts with customers and requires additional disclosures regarding such contracts (new revenue standard). Under the new revenue standard, revenue is recognized when control of the promised goods or services is transferred to customers at an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods and services. NEP adopted the new revenue standard using the modified retrospective approach applying it only to contracts that were not complete at January 1, 2018. NEP did not recognize a cumulative effect adjustment on January 1, 2018 because revenue recognized under the new accounting standard remained consistent with historical practice. NEP's operating revenues are generated primarily from various non-affiliated parties under long-term power purchase agreements, FIT agreements and RESOP agreements (collectively, PPAs) and natural gas transportation agreements. Revenue is recognized as energy and any related renewable energy attributes are delivered, based on rates stipulated in the respective PPAs, or natural gas transportation services are performed. NEP believes that the obligation to deliver energy and provide the natural gas transportation services is satisfied over time as the customer simultaneously receives and consumes benefits provided by NEP. In addition, NEP believes that the obligation to deliver renewable energy attributes is satisfied at multiple points in time, with the control of the renewable energy attribute being transferred at the same time the related energy is delivered. Substantially all of the PPAs are accounted for as operating leases and are not considered contracts with customers within the scope of the new revenue standard. Leases - In February 2016, the Financial Accounting Standards Board (FASB) issued an accounting standards update which requires, among other things, that lessees recognize a lease liability, initially measured at the present value of the future lease payments, and a right-of-use asset for all leases (with the exception of short-term leases) (new lease standard). The new lease standard also requires new qualitative and quantitative disclosures for both lessees and lessors. The new lease standard will be effective for NEP beginning January 1, 2019. Early adoption is permitted. The new lease standard may be applied retrospectively to each prior period presented or retrospectively with the cumulative effect recognized as an adjustment to retained earnings as of the date of initial application. NEP is currently reviewing its portfolio of contracts and evaluating the proper application of the new lease standard to these contracts in order to determine the impact the adoption will have on its consolidated financial statements. NEP is implementing a number of system enhancements to facilitate the identification, tracking and reporting of leases based upon the requirements of the new lease standard. NEP is continuing to assess the transition options and practical expedients and monitoring industry implementation issues. Restricted Cash - In the fourth quarter of 2017, NEP early adopted an accounting standards update which requires that restricted cash be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the condensed consolidated statements of cash flows. NEP adopted the standards update retrospectively, which adoption did not have a material impact to the condensed consolidated statements of cash flows. Accounting for Partial Sales of Nonfinancial Assets - Effective January 1, 2018, NEP adopted an accounting standards update regarding the accounting for partial sales of nonfinancial assets using the modified retrospective approach. This standards update affects the accounting and related financial statement presentation for the sales of differential membership interests to third-party investors.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	9 Months Ended
	Sep. 30, 2018
Fair Value Disclosures [Abstract]
Schedule of financial assets and liabilities and other fair value measurements on a recurring basis	NEP’s financial assets and liabilities and other fair value measurements made on a recurring basis by fair value hierarchy level are as follows: September 30, 2018 December 31, 2017 Level 1 Level 2 Total Level 1 Level 2 Total (millions) Assets: Cash equivalents $ 45 $ — $ 45 $ 61 $ — $ 61 Restricted cash equivalents (a) 24 — 24 31 — 31 Interest rate contracts — 81 81 — 15 15 Total assets $ 69 $ 81 $ 150 $ 92 $ 15 $ 107 Liabilities: Interest rate contracts $ — $ 57 $ 57 $ — $ 44 $ 44 Foreign currency contracts — — — — 3 3 Total liabilities $ — $ 57 $ 57 $ — $ 47 $ 47 ____________________ (a) At September 30, 2018 and December 31, 2017 , approximately $9 million and $7 million , respectively, of restricted cash equivalents are included in other non-current assets on NEP's condensed consolidated balance sheets.
Schedule of other financial instrument, carrying amounts and estimated fair values	The carrying amounts and estimated fair values of other financial instruments recorded at other than fair value are as follows: September 30, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value (millions) Long-term debt, including current maturities (a) $ 3,555 $ 3,512 $ 4,317 $ 4,456 ____________________ (a) At September 30, 2018 and December 31, 2017 , approximately $3,036 million and $3,552 million , respectively, of the fair value is estimated using a market approach based on quoted market prices for the same or similar issues (Level 2); the balance is estimated using an income approach utilizing a discounted cash flow valuation technique, considering the current credit profile of the debtor (Level 3).

Derivative Instruments and He_2

Derivative Instruments and Hedging Activity (Tables)	9 Months Ended
	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of the fair values of derivative instruments designated as cash flow hedging instruments included in balance sheets	The tables below present NEP's gross derivative positions, based on the total fair value of each derivative instrument, at September 30, 2018 and December 31, 2017 , as required by disclosure rules, as well as the location of the net derivative positions, based on the expected timing of future payments, on the condensed consolidated balance sheets. September 30, 2018 Gross Basis Net Basis Assets Liabilities Assets Liabilities (millions) Interest rate contracts $ 81 $ 57 $ 41 $ 17 Net fair value by balance sheet line item: Other current assets $ 8 Other non-current assets 33 Other current liabilities $ — Other non-current liabilities 17 Total derivatives $ 41 $ 17 December 31, 2017 Gross Basis Net Basis Assets Liabilities Assets Liabilities (millions) Interest rate contracts $ 15 $ 44 $ 18 $ 47 Foreign currency contracts — 3 — 3 Total fair values $ 15 $ 47 $ 18 $ 50 Net fair value by balance sheet line item: Other current assets $ 10 Other non-current assets 8 Other current liabilities $ 11 Other non-current liabilities 39 Total derivatives $ 18 $ 50
Schedule of gains (losses) related to interest rate contracts	Gains (losses) related to NEP's interest rate contracts are recorded in the condensed consolidated financial statements as follows: Three Months Ended September 30, Nine Months Ended September 30, 2018 2017 2018 2017 (millions) Interest rate contracts: Losses reclassified from AOCI to interest expense $ — $ (1 ) $ (3 ) $ (6 ) Gains (losses) recognized in interest expense $ 74 $ (1 ) $ 55 $ (21 )

Capitalization (Tables)

Capitalization (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Schedule of Earnings Per Share, Basic and Diluted	The reconciliation of NEP's basic and diluted earnings per unit is as follows: Three Months Ended Nine Months Ended (millions, except per unit amounts) Numerator: Net income attributable to NEP – basic $ 33 $ 189 Adjustments for convertible notes and preferred units 10 52 Net income attributable to NEP used to compute diluted earnings per unit $ 43 $ 241 Denominator: Weighted-average number of common units outstanding – basic 54.9 54.5 Convertible notes and preferred units 19.7 19.7 Weighted-average number of common units outstanding – assuming dilution 74.6 74.2 Earnings per unit attributable to NEP: Basic $ 0.60 $ 3.47 Assuming dilution $ 0.58 $ 3.25

Accumulated Other Comprehensi_2

Accumulated Other Comprehensive Income (Loss) (Tables)	9 Months Ended
	Sep. 30, 2018
Equity [Abstract]
Schedule of accumulated other comprehensive income (loss)	Accumulated Other Comprehensive Income (Loss) Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Three months ended September 30, 2018 Balances, June 30, 2018 $ 6 $ (30 ) $ (24 ) Amounts reclassified from AOCI to interest expense (1 ) — (1 ) Other comprehensive income related to equity method investee — 9 9 Net other comprehensive income (loss) (1 ) 9 8 Balances, September 30, 2018 $ 5 $ (21 ) $ (16 ) AOCI attributable to noncontrolling interest $ 4 $ (15 ) $ (11 ) AOCI attributable to NEP $ 1 $ (6 ) $ (5 ) Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Nine months ended September 30, 2018 Balances, December 31, 2017 $ 1 $ (98 ) $ (30 ) $ (127 ) Amounts reclassified from AOCI to interest expense 1 — — 1 Net unrealized losses on foreign currency translation — (6 ) — (6 ) Other comprehensive income related to equity method investee — — 9 9 Net other comprehensive income (loss) 1 (6 ) 9 4 Impact of disposal of Canadian Holdings 3 104 — 107 Balances, September 30, 2018 $ 5 $ — $ (21 ) $ (16 ) AOCI attributable to noncontrolling interest $ 4 $ — $ (15 ) $ (11 ) AOCI attributable to NEP $ 1 $ — $ (6 ) $ (5 ) Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Three months ended September 30, 2017 Balances, June 30, 2017 $ (1 ) $ (102 ) $ (34 ) $ (137 ) Amounts reclassified from AOCI to interest expense 1 — — 1 Net unrealized gains on foreign currency translation — 5 — 5 Net other comprehensive income 1 5 — 6 Balances, September 30, 2017 $ — $ (97 ) $ (34 ) $ (131 ) AOCI attributable to noncontrolling interest $ (1 ) $ (95 ) $ (35 ) $ (131 ) AOCI attributable to NEP $ 1 $ (2 ) $ 1 $ — Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Nine months ended September 30, 2017 Balances, December 31, 2016 $ (4 ) $ (105 ) $ (35 ) $ (144 ) Amounts reclassified from AOCI to interest expense 4 — — 4 Net unrealized gains on foreign currency translation — 8 — 8 Other comprehensive income related to equity method investee — — 1 1 Net other comprehensive income 4 8 1 13 Balances, September 30, 2017 $ — $ (97 ) $ (34 ) $ (131 ) AOCI attributable to noncontrolling interest $ (1 ) $ (95 ) $ (35 ) $ (131 ) AOCI attributable to NEP $ 1 $ (2 ) $ 1 $ —

Summary of Significant Accoun_3

Summary of Significant Accounting and Reporting Policies (Tables)	9 Months Ended
	Sep. 30, 2018
Noncontrolling Interest [Member]
Noncontrolling Interest [Line Items]
Schedule of Noncontrolling Interest	Details of the activity in noncontrolling interests for the nine months ended September 30, 2018 is below: Differential Membership Interests Noncontrolling Ownership Interests in NEP OpCo and Texas pipeline Total Noncontrolling (millions) Balances, December 31, 2017 $ — $ 20 $ 20 Related party note receivable — 31 31 Net income (loss) attributable to NCI (336 ) (a) 514 178 Other comprehensive income — 12 12 Related party contributions — 1 1 Related party distributions — (153 ) (153 ) Changes in non-economic ownership interests and equity method investee — (6 ) (6 ) Differential membership investment contributions, net of distributions 40 — 40 Disposal of Canadian Holdings — 105 105 Adoption of accounting standards update 1,413 3 1,416 Balances, September 30, 2018 $ 1,117 $ 527 $ 1,644 ____________________ (a) Represents the benefits associated with differential membership interests recognized as the third-party investors received their portion of the economic attributes of the related facilities. Approximately $219 million of the loss attributable to differential membership interests benefits NEE's noncontrolling interest and $117 million is reflected as net income attributable to NEP

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2018
Commitments and Contingencies Disclosure [Abstract]
Other Commitments	At September 30, 2018 , payments under these contracts were estimated as follows: Year Ending December 31, Commitments (millions) Remainder of 2018 $ 9 2019 32 2020 32 2021 32 2022 33 Thereafter 455 Total estimated payments $ 593

Acquisitions (Details)

Acquisitions (Details) $ in Millions	1 Months Ended	3 Months Ended
	Aug. 31, 2018wind_generation_facilityMW	Dec. 31, 2018USD ($)
NEP Renewables, LLC [Member] | Scenario, Forecast [Member]
Business Acquisition [Line Items]
Total consideration | $		$ 1,275
Assumption of existing noncontrolling interests | $		930
Assumption of existing debt | $		$ 38
Breckenridge Wind Class A Holdings, LLC [Member] | NEP Renewables, LLC [Member]
Business Acquisition [Line Items]
Membership interest	100.00%
Generation facility capacity (mw)	98
Carousel Wind Holdings, LLC [Member] | NEP Renewables, LLC [Member]
Business Acquisition [Line Items]
Membership interest	100.00%
Generation facility capacity (mw)	150
Monarch Wind Holdings, LLC [Member] | NEP Renewables, LLC [Member]
Business Acquisition [Line Items]
Membership interest	100.00%
Generation facility capacity (mw)	450
Number of wind generation facilities | wind_generation_facility	2
Mountain View Solar Holdings, LLC [Member] | NEP Renewables, LLC [Member]
Business Acquisition [Line Items]
Membership interest	100.00%
Generation facility capacity (mw)	20
Pacific Plans Wind Class A Holdings, LLC [Member] | NEP Renewables, LLC [Member]
Business Acquisition [Line Items]
Membership interest	100.00%
Generation facility capacity (mw)	255
Number of wind generation facilities | wind_generation_facility	3
Palomino Wind Holdings, LLC [Member] | NEP Renewables, LLC [Member]
Business Acquisition [Line Items]
Membership interest	100.00%
Generation facility capacity (mw)	415
Number of wind generation facilities | wind_generation_facility	3

Revenue (Details)

Revenue (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2018USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues over the remaining terms of the related contacts	$ 1,900	$ 1,900
Renewable Energy Sales [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customer	11	40
Natural Gas Transportation Services [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customer	$ 52	$ 162

Income Taxes (Details)

Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended			12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017		Dec. 31, 2017
Income Tax Contingency [Line Items]
Reduction in net deferred income tax assets							$ 101
Discontinued Operation, Tax (Expense) Benefit from Provision for (Gain) Loss on Disposal	$ 47			$ 47
Effective tax rate (as a percent)	12.00%	30.00%		3.00%	24.00%
Removal of historical deferred tax liabilities				$ (23)	$ (54)	[1]
INCOME TAX EXPENSE	$ 15	$ 21	[2]	13	$ 52	[2]
Tax Cuts and Jobs Act of 2017, income tax expense (benefit)				20
Accounting Standards Update 2017-05 [Member]
Income Tax Contingency [Line Items]
Income (loss) attributable to noncontrolling interest, before tax				$ 231
Canada Revenue Agency [Member]
Income Tax Contingency [Line Items]
Canadian taxes included				100.00%
Removal of historical deferred tax liabilities				$ 69
Domestic Tax Authority [Member]
Income Tax Contingency [Line Items]
INCOME TAX EXPENSE	$ 22			$ 22
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1 and Note 10 - Restricted Cash.
[2]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Liabilities:
Restricted cash equivalents	$ 9	$ 7
Recurring Basis [Member]
Assets:
Cash equivalents	45	61
Restricted cash equivalents	24	31
Interest rate contracts	81	15
Total assets	150	107
Liabilities:
Interest rate contracts	57	44
Foreign currency contracts	0	3
Total liabilities	57	47
Recurring Basis [Member] | Level 1 [Member]
Assets:
Cash equivalents	45	61
Restricted cash equivalents	24	31
Interest rate contracts	0	0
Total assets	69	92
Liabilities:
Interest rate contracts	0	0
Foreign currency contracts	0	0
Total liabilities	0	0
Recurring Basis [Member] | Level 2 [Member]
Assets:
Cash equivalents	0	0
Restricted cash equivalents	0	0
Interest rate contracts	81	15
Total assets	81	15
Liabilities:
Interest rate contracts	57	44
Foreign currency contracts	0	3
Total liabilities	$ 57	$ 47

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Value and Fair Value of Other Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current maturities	$ 3,555	$ 4,317
Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current maturities	3,512	4,456
Valuation, Market Approach [Member] | Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current maturities	$ 3,036	$ 3,552

Derivative Instruments and He_3

Derivative Instruments and Hedging Activity - Additional Disclosures (Details) $ in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Sep. 30, 2018USD ($)	Sep. 30, 2017USD ($)	Apr. 30, 2018CAD ($)	Dec. 31, 2017USD ($)
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	$ 8,222		$ 8,222			$ 3,609
Net losses included in AOCI expected to be reclassified into interest expense within the next 12 months	1		1
Foreign Currency Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount					$ 741	62
Gains (losses) related to foreign currency contract	(1)	$ (2)	13	$ (5)
Credit Risk Related Contingent Contracts [Member]
Derivative [Line Items]
Fair value of derivative instruments, liabilities	$ 57		$ 57			$ 17

Derivative Instruments and He_4

Derivative Instruments and Hedging Activity - Fair Value of Derivative Instruments Included in Balance Sheets (Details) - Cash Flow Hedges [Member] - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	$ 41	$ 18
Fair value of derivative instruments, liabilities	17	50
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	8	10
Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	33	8
Current Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	0	11
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	17	39
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	41	18
Fair value of derivative instruments, liabilities	17	47
Foreign Currency Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets		0
Fair value of derivative instruments, liabilities		3
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets		15
Fair value of derivative instruments, liabilities		47
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	81	15
Fair value of derivative instruments, liabilities	$ 57	44
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets		0
Fair value of derivative instruments, liabilities		$ 3

Derivative Instruments and He_5

Derivative Instruments and Hedging Activity - Gains (Losses) Related to Cash Flow Hedges (Details) - Interest Rate Contract [Member] - Designated as Hedging Instrument [Member] - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Losses reclassified from AOCI to interest expense	$ 0	$ (1)	$ (3)	$ (6)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) recognized in interest expense	$ 74	$ (1)	$ 55	$ (21)

Variable Interest Entities (Det

Variable Interest Entities (Details) $ in Millions	Apr. 30, 2015equity_investmentshares	Sep. 30, 2018USD ($)electric_generation_facilityvariable_interest_entity	Dec. 31, 2017USD ($)
Variable Interest Entity [Line Items]
Number of entities consolidated | variable_interest_entity		7
Number of wind electric generation facilities owned and operated | electric_generation_facility		10
Property, plant and equipment - net		$ 5,132	$ 6,197
Deferral related to differential membership interests		0	1,442
NextEra Energy Operating Partners, LP [Member]
Variable Interest Entity [Line Items]
Ownership interests percentage	50.00%
Class B Units, Series 1 [Member] | NextEra Energy Partners, LP [Member] | NextEra Energy Operating Partners, LP [Member]
Variable Interest Entity [Line Items]
Number of units issued (in units) | shares	1,000,000
Class B Units, Series 2 [Member] | NextEra Energy Partners, LP [Member] | NextEra Energy Operating Partners, LP [Member]
Variable Interest Entity [Line Items]
Number of units issued (in units) | shares	1,000,000
Palo Duro WInd Project Holdings, LLC [Member] | Variable Interest Entity, Primary Beneficiary [Member]
Variable Interest Entity [Line Items]
Property, plant and equipment - net		2,775	2,840
Deferral related to differential membership interests		$ 75	$ 1,515
Adelanto I, Adelanto II and McCoy [Member] | Subsidiaries [Member]
Variable Interest Entity [Line Items]
Number of investments | equity_investment	3
Economic rights percentage	100.00%
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Limited partner interest percentage		35.60%	34.90%
Noncontrolling limited partner interest percentage		64.40%

Capitalization - Narrative (Det

Capitalization - Narrative (Details) - USD ($) $ / shares in Units, shares in Millions	Oct. 22, 2018	Aug. 31, 2018	Sep. 30, 2018	Jul. 31, 2018
LLC Agreement [Member]
Class of Stock [Line Items]
Period of cash distributions		3 years
LLC Agreement [Member] | First Three Years After Funding [Member]
Class of Stock [Line Items]
Percentage of cash distributions		85.00%
LLC Agreement [Member] | Three Years After Funding [Member]
Class of Stock [Line Items]
Percentage of cash distributions		20.00%
Class B Member Units [Member] | LLC Agreement [Member]
Class of Stock [Line Items]
Buyout right		100.00%
Common Units [Member] | LLC Agreement [Member]
Class of Stock [Line Items]
Right to pay		70.00%
Class B Purchaser [Member] | LLC Agreement [Member]
Class of Stock [Line Items]
Pre-tax return		7.75%
Class B Purchaser [Member] | LLC Agreement [Member] | First Three Years After Funding [Member]
Class of Stock [Line Items]
Percentage of cash distributions		15.00%
Class B Purchaser [Member] | LLC Agreement [Member] | Three Years After Funding [Member]
Class of Stock [Line Items]
Percentage of cash distributions		80.00%
Class B Purchaser [Member] | NEP Renewables, LLC [Member]
Class of Stock [Line Items]
Noncontrolling limited partner interest percentage		59.00%
Class B Purchaser [Member] | Class B Member Units [Member] | NEP Renewables, LLC [Member]
Class of Stock [Line Items]
Noncontrolling limited partner interest percentage		100.00%
Class B Purchaser [Member] | NEP Renewables, LLC [Member] | Class B Member Units [Member]
Class of Stock [Line Items]
Purchaser's commitment to pay		$ 750,000,000
NEP Renewables Holdings, LLC [Member] | NEP Renewables, LLC [Member]
Class of Stock [Line Items]
Noncontrolling interest, ownership percentage by parent		41.00%
NEP Renewables Holdings, LLC [Member] | Class A Member Units [Member] | NEP Renewables, LLC [Member]
Class of Stock [Line Items]
Noncontrolling interest, ownership percentage by parent		100.00%
Subsequent Event [Member]
Class of Stock [Line Items]
Distribution made to limited partner, distributions declared, per unit (in dollars per share)	$ 0.45
ATM Program [Member]
Class of Stock [Line Items]
Number of common units issued (in shares)			1.7
At-the-market equity issuance program				$ 150,000,000
Gross proceeds			$ 82,000,000
Fees related to ATM program			$ 1,000,000

Capitalization - Schedule of Ea

Capitalization - Schedule of Earnings Per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
Numerator:
Net income attributable to NEP – basic	$ 33	$ 1	[1]	$ 189	$ 26	[1]
Adjustments for convertible notes and preferred units	10			52
Net income attributable to NEP used to compute diluted earnings per unit	$ 43			$ 241
Denominator:
Weighted average number of common units outstanding - basic (in shares)	54.9	54.3	[1]	54.5	54.2	[1]
Convertible notes and preferred units (in shares)	19.7			19.7
Weighted-average number of common units outstanding – assuming dilution (in shares)	74.6	54.3	[1]	74.2	54.2	[1]
Earnings per unit attributable to NEP:
Basic (in shares)	$ 0.60	$ 0.01	[1]	$ 3.47	$ 0.47	[1]
Assuming dilution (in shares)	$ 0.58	$ 0.01		$ 3.25	$ 0.47
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Accumulated Other Comprehensi_3

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017		Sep. 30, 2018	Sep. 30, 2017
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance				$ 2,208	$ 2,566	[1]
Total other comprehensive income, net of tax	$ 8	$ 6	[2]	4	13	[1],[2]
Impact of disposal of Canadian Holdings				107
Ending balance	4,032	2,588	[1]	4,032	2,588	[1]
Total
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(24)	(137)		(127)	(144)
Ending balance	(16)	(131)		(16)	(131)
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	6	(1)		1	(4)
Amounts reclassified from AOCI to interest expense	(1)	1		1	4
Total other comprehensive income, net of tax	(1)	1		1	4
Impact of disposal of Canadian Holdings				3
Ending balance	5	0		5	0
Net Unrealized Gains (Losses) on Foreign Currency Translation [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance		(102)		(98)	(105)
Other comprehensive income (loss)		5		(6)	8
Total other comprehensive income, net of tax		5		(6)	8
Impact of disposal of Canadian Holdings				104
Ending balance	0	(97)		0	(97)
Other Comprehensive Income (Loss) Related to Equity Method Investee [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(30)	(34)		(30)	(35)
Other comprehensive income (loss)	9			9	1
Total other comprehensive income, net of tax	9			9	1
Ending balance	(21)	(34)		(21)	(34)
Total Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	(11)	(131)		(11)	(131)
Net Unrealized Gains (Losses) on Cash Flow Hedges Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	4	(1)		4	(1)
Net Unrealized Gains (Losses) on Foreign Currency Translation Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	0	(95)		0	(95)
Other Comprehensive Income (Loss) Related to Equity Method Investee Attributable to Noncontrolling Interest [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	(15)	(35)		(15)	(35)
Total Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	(5)	0		(5)	0
Net Unrealized Gains (Losses) on Cash Flow Hedges Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	1	1		1	1
Net Unrealized Gains (Losses) on Foreign Currency Translation Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	0	(2)		0	(2)
Other Comprehensive Income (Loss) Related to Equity Method Investee Attributable to Parent [Member]
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Ending balance	$ (6)	$ 1		$ (6)	$ 1
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[2]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Due from related parties	$ 809		$ 809		$ 88
Revenue from related parties	1	$ 2	3	$ 8
Transportation and Fuel Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue from related parties	1	2		7
NextEra Energy, Inc. [Member] | Management Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	20	17	57	49
NEER [Member] | Cash Sweep and Credit Support Agreement [Member]
Related Party Transaction [Line Items]
Interest expense	1	$ 1	3	$ 3
Due from related parties	807		807		$ 87
Subsidiaries of NEER [Member] | Transportation and Fuel Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue from related parties			$ 2
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	59		59
NextEra Energy Capital Holdings [Member] | Guarantees and Letters of Credit [Member]
Related Party Transaction [Line Items]
Total amount of letters of credit	$ 575		$ 575

Summary of Significant Accoun_4

Summary of Significant Accounting and Reporting Policies - Narrative (Details) $ in Millions, $ in Millions		Jun. 29, 2018USD ($)	Jun. 30, 2018USD ($)	Jun. 30, 2018CAD ($)	Sep. 30, 2018USD ($)wind_generation_facilitysolar_generation_facilityMW	Sep. 30, 2017USD ($)		Sep. 30, 2018USD ($)wind_generation_facilitysolar_generation_facilityMW	Sep. 30, 2017USD ($)		Jan. 01, 2018USD ($)	Dec. 31, 2017USD ($)
Property, Plant and Equipment [Line Items]
Restricted cash, noncurrent					$ 19			$ 19				$ 19
Proceeds from the sale of Canadian Holdings - net								517	$ 0	[1]
Gain on disposal of Canadian Holdings					0	$ 0	[2]	158	0	[1],[2]
Income before income taxes					125	71	[2]	398	219	[2]
Net income (loss) attributable to noncontrolling interest	[3]				71	49	[2]	178	141	[2]
Accounting Standards Update 2017-05 [Member]
Property, Plant and Equipment [Line Items]
Net income (loss) attributable to noncontrolling interest								211
Income (loss) attributable to noncontrolling interest, before tax								231
Accounting Standards Update 2017-05 [Member] | Deferral Related to Differential Membership Interest - VIE [Member]
Property, Plant and Equipment [Line Items]
Cumulative effect of new accounting principle in period of adoption											$ 1,442
Third-Party Investors [Member]
Property, Plant and Equipment [Line Items]
Net income (loss) attributable to noncontrolling interest					$ 28			105
Canadian Holdings [Member]
Property, Plant and Equipment [Line Items]
Income before income taxes						$ 8		$ 47	$ 47
Non Affiliated Party [Member]
Property, Plant and Equipment [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners					10.00%			10.00%
Canadian Holdings [Member] | Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Proceeds from the sale of Canadian Holdings - net		$ 563		$ 740
Assumption of existing debt					$ 676			$ 676
Number of wind generation facilities | wind_generation_facility					4			4
Number of solar generation facilities | solar_generation_facility					2			2
Generation facility capacity (mw) | MW					396			396
Gain on disposal of Canadian Holdings			$ 158
Gain on disposition of business, after tax			$ 205
NEP OpCo [Member]
Property, Plant and Equipment [Line Items]
Noncontrolling interest, ownership percentage by parent					35.60%			35.60%				34.90%
Noncontrolling interest, ownership percentage by noncontrolling owners					64.40%			64.40%
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1 and Note 10 - Restricted Cash.
[2]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[3]	For the three and nine months ended September 30, 2017, net income attributable to noncontrolling interests includes the pre-acquisition net income of the common control acquisitions. See Note 1.

Summary of Significant Accoun_5

Summary of Significant Accounting and Reporting Policies - Noncontrolling Interests (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2018	Sep. 30, 2017	[3]	Sep. 30, 2018		Sep. 30, 2017
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balances, December 31, 2017					$ 20
Related party note receivable					31		$ 1	[1]
Net income (loss) attributable to NCI	[2]	$ 71	$ 49		178		141	[3]
Related party contributions					1	[1]	318	[4]
Related party distributions					(153)		(172)	[4]
Changes in non-economic ownership interests and equity method investee					(6)		(3)	[4]
Differential membership investment contributions, net of distributions					40
Disposal of Canadian Holdings					107
Balances, September 30, 2018		1,644			1,644
Net loss attributable to NCI	[2]	(71)	(49)		(178)		(141)	[3]
Net loss attributable to NEP – basic		(33)	$ (1)		(189)		(26)	[3]
Differential Membership Interests [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balances, December 31, 2017					0
Related party note receivable					0
Net income (loss) attributable to NCI					(336)
Other comprehensive income					0
Related party contributions					0
Related party distributions					0
Changes in non-economic ownership interests and equity method investee					0
Disposal of Canadian Holdings					0
Adoption of accounting standards update					1,413
Balances, September 30, 2018		1,117			1,117
Net loss attributable to NCI					336
Net loss attributable to NEP – basic					117
Differential Membership Interests [Member] | NextEra Energy, Inc. [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income (loss) attributable to NCI					(219)
Net loss attributable to NCI					219
Noncontrolling Ownership Interests in NEP OpCo and Texas Pipeline [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balances, December 31, 2017					20
Net income (loss) attributable to NCI					514
Other comprehensive income					12
Differential membership investment contributions, net of distributions					0
Adoption of accounting standards update					3
Balances, September 30, 2018		527			527
Net loss attributable to NCI					(514)
Noncontrolling Interest [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Balances, December 31, 2017					20
Related party note receivable					31
Net income (loss) attributable to NCI					178
Other comprehensive income					12
Related party contributions					1
Related party distributions					(153)
Changes in non-economic ownership interests and equity method investee					(6)
Differential membership investment contributions, net of distributions					40
Disposal of Canadian Holdings					105
Adoption of accounting standards update					1,416
Balances, September 30, 2018		$ 1,644			1,644
Net loss attributable to NCI					(178)
Noncontrolling Interest [Member]
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Related party note receivable					31		1	[1]
Related party contributions					1	[1]	318	[4]
Related party distributions					(153)		(172)	[4]
Changes in non-economic ownership interests and equity method investee					(6)		$ (3)	[4]
Differential membership investment contributions, net of distributions					40
Disposal of Canadian Holdings					$ 105
[1]	At September 30, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in November 2018.
[2]	For the three and nine months ended September 30, 2017, net income attributable to noncontrolling interests includes the pre-acquisition net income of the common control acquisitions. See Note 1.
[3]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[4]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Commitments and Contingencies -

Commitments and Contingencies - Contracts (Details) $ in Millions	Sep. 30, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2018	$ 9
2,019	32
2,020	32
2,021	32
2,022	33
Thereafter	455
Total estimated payments	$ 593

Commitments and Contingencies_2

Commitments and Contingencies - Commitments (Details) $ in Millions	9 Months Ended
	Sep. 30, 2018USD ($)
Operating Leased Assets [Line Items]
Payments for acquisition holdback	$ 200
Genesis [Member] | Surety Bond [Member]
Operating Leased Assets [Line Items]
Surety bond	23
Standby Letters of Credit [Member] | Letters of Credit Due June and July 2022 [Member]
Operating Leased Assets [Line Items]
Credit facility, maximum borrowing capacity	82
Credit facility, amount outstanding	$ 68