XPLR Infrastructure (XIFR) 10-Q 24 Apr 18 2017 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information	3 Months Ended
	Mar. 31, 2018shares
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2018
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q1
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 Common Stock, Shares Outstanding	54,313,714

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
OPERATING REVENUES
Renewable energy sales		$ 156	$ 149	[1]
Texas pipelines service revenues		56	49	[1]
Total operating revenues	[2]	212	198	[1]
OPERATING EXPENSES
Operations and maintenance	[3]	64	56	[1]
Depreciation and amortization		53	56	[1],[4]
Taxes other than income taxes and other		5	4	[1]
Total operating expenses		122	116	[1]
OPERATING INCOME		90	82	[1]
OTHER INCOME (DEDUCTIONS)
Interest expense		(103)	(43)	[1]
Benefits associated with differential membership interests - net		0	31	[1],[4]
Equity in earnings of equity method investee		3	2	[1]
Equity in earnings of non-economic ownership interests		6	0	[1],[4]
Other - net		2	0	[1]
Total other income (deductions) - net		(92)	(10)	[1]
INCOME (LOSS) BEFORE INCOME TAXES		(2)	72	[1]
INCOME TAXES		19	14	[1]
NET INCOME (LOSS)	[5]	(21)	58	[1],[4]
Net income attributable to preferred distributions		(6)	0	[1],[6]
Less net income (loss) attributable to noncontrolling interest	[7]	100	(46)	[1]
NET INCOME ATTRIBUTABLE TO NEXTERA ENERGY PARTNERS, LP		$ 73	$ 12	[1]
Weighted average number of common units outstanding - basic (in shares)		54.3	54.2	[1]
Weighted average number of common units outstanding - assuming dilution (in shares)		74	54.2	[1]
Earnings per common unit attributable to NextEra Energy Partners, LP - basic (in dollars per share)		$ 1.35	$ 0.22	[1]
Earnings per common unit attributable to NextEra Energy Partners, LP - basic (in dollars per share)		1.21	0.22
Distributions per common unit (in dollars per unit)		$ 0.4050	$ 0.3525	[1]
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[2]	Includes related party revenues of approximately $2 million and $5 million for the three months ended March 31, 2018 and 2017, respectively.
[3]	Includes O&M expenses related to renewable energy projects of $31 million and $26 million for the three months ended March 31, 2018 and 2017, respectively. Includes O&M expenses related to the Texas pipelines of $11 million and $12 million for the three months ended March 31, 2018 and 2017, respectively. Total O&M expenses presented include related party amounts of approximately $24 million and $21 million for the three months ended March 31, 2018 and 2017, respectively.
[4]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1 and Note 10 - Restricted Cash.
[5]	At March 31, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in May 2018.
[6]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[7]	For the three months ended March 31, 2017, net income attributable to noncontrolling interests includes the pre-acquisition net income of the common control acquisitions. See Note 1.

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Income (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Related party revenues	$ 2	$ 5
Operations and maintenance related to renewable energy projects	31	26
Operations and maintenance related to Texas pipelines	11	12
Operations and maintenance related party	$ 24	$ 21

Condensed Consolidated Stateme4

Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
NET INCOME (LOSS)	[1]	$ (21)	$ 58	[2],[3]
OTHER COMPREHENSIVE INCOME, NET OF TAX
Reclassification from accumulated other comprehensive income (loss) to net income (net of approximately $1 and $1 tax expense, respectively)		1	2	[4]
Net unrealized losses on foreign currency translation (net of approximately $0 tax benefit and $0 tax expense, respectively)		(4)	0	[4]
Other comprehensive income related to equity method investee (net of approximately $0 tax expense and $0 tax expense, respectively)		4	1	[4]
Total other comprehensive income, net of tax	[1]	1	3	[4]
COMPREHENSIVE INCOME (LOSS)		(20)	61	[4]
Net income attributable to preferred distributions		(6)	0	[3],[4]
Less comprehensive income (loss) attributable to noncontrolling interest	[5]	99	(48)	[4]
COMPREHENSIVE INCOME ATTRIBUTABLE TO NEXTERA ENERGY PARTNERS, LP		$ 73	$ 13	[4]
[1]	At March 31, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in May 2018.
[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.
[5]	comprehensive income attributable to noncontrolling interests includes the pre-acquisition comprehensive income of the common control acquisitions. See Note 1.

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Unaudited) (Parentheticals) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 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	$ 1
Unrealized gains (losses) on foreign currency translation, tax expense	0	0
Other comprehensive income (loss) related to equity method investee, tax (benefit) expense	$ 0	$ 0
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions		Mar. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents		$ 164	$ 154	[1]
Accounts receivable		72	85	[1]
Due from related parties		91	88	[1]
Restricted cash		12	25	[1]
Assets held for sale		913	0
Other current assets		38	46	[1]
Total current assets		1,290	398	[1]
Non-current assets:
Property, plant and equipment - net		5,239	6,197	[1]
Deferred income taxes		152	181	[1]
Intangible assets – customer relationships - net		657	661	[1]
Goodwill		628	628	[1]
Investment in equity method investee		215	218	[1]
Investments in non-economic ownership interests		11	11	[1]
Other non-current assets		94	101	[1]
Total non-current assets		6,996	7,997	[1]
TOTAL ASSETS		8,286	8,395	[1]
Current liabilities:
Accounts payable and accrued expenses		10	26	[1]
Due to related parties		39	45	[1]
Current maturities of long-term debt		62	99	[1]
Accrued interest		13	39	[1]
Derivatives		4	11	[1]
Liabilities associated with assets held for sale		824	0
Other current liabilities		40	56	[1]
Total current liabilities		992	276	[1]
Non-current liabilities:
Long-term debt		3,518	4,218	[1]
Deferral related to differential membership interests		0	1,442	[1]
Deferred income taxes		5	63	[1]
Asset retirement obligation		68	81	[1]
Non-current due to related party		22	21	[1]
Other non-current liabilities		116	86	[1]
Total non-current liabilities		3,729	5,911	[1]
TOTAL LIABILITIES		4,721	6,187	[1]
COMMITMENTS AND CONTINGENCIES				[1]
EQUITY
Preferred units (14.0 units issued and outstanding)		548	548	[1]
Common units (54.3 units issued and outstanding)		1,699	1,639	[1]
Accumulated other comprehensive income		1	1	[1]
Noncontrolling interests		1,317	20	[1]
TOTAL EQUITY	[2]	3,565	2,208	[1]
TOTAL LIABILITIES AND EQUITY		$ 8,286	$ 8,395	[1]
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[2]	At March 31, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in May 2018.

Condensed Consolidated Balance7

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - shares shares in Millions	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Common units issued	54.3	54.2
Common units outstanding	54.3	54.2
Preferred units issued	14	14
Preferred units outstanding	14	14

Condensed Consolidated Stateme8

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	[2]
CASH FLOWS FROM OPERATING ACTIVITIES
Net income (loss)	[1]	$ (21)	$ 58	[3]
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization		53	56	[3]
Change in value of derivative contracts		51	2
Deferred income taxes		16	13
Benefits associated with differential membership interests - net		0	(31)	[3]
Equity in earnings of equity method investee, net of distributions received		7	11
Equity in earnings of non-economic ownership interests		(6)	0	[3]
Other - net		(2)	3
Changes in operating assets and liabilities:
Accounts receivable		(11)	(11)
Other current assets		2	(2)
Other non-current assets		1	(7)
Accounts payable and accrued expenses		(1)	(2)
Due to related parties		(5)	(1)
Other current liabilities		(33)	(23)
Payment of acquisition holdback		0	(14)
Other non-current liabilities		2	9
Net cash provided by operating activities		53	61
CASH FLOWS FROM INVESTING ACTIVITIES
Capital expenditures		(4)	(316)
Payments to related parties under CSCS agreement - net		(2)	(32)
Net cash used in investing activities		(6)	(348)
CASH FLOWS FROM FINANCING ACTIVITIES
Issuances of long-term debt		0	210
Retirements of long-term debt		(31)	(37)
Partners/Members' contributions		29	304
Partners/Members' distributions		(66)	(79)
Preferred unit distributions		(3)	0
Proceeds from differential membership investors		28	18
Payments to differential membership investors		(5)	(5)
Change in amounts due to related parties		0	(1)
Payment of acquisition holdback		0	(186)
Net cash provided by (used in) financing activities		(48)	224
Effect of exchange rate changes on cash		(1)	1
NET DECREASE IN CASH, CASH EQUIVALENTS AND RESTRICTED CASH		(2)	(62)
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - BEGINNING OF PERIOD		198	191
CASH, CASH EQUIVALENTS AND RESTRICTED CASH - END OF PERIOD		196	129
SUPPLEMENTAL DISCLOSURE OF CASH FLOW INFORMATION:
Partners/Members' noncash distributions		17	0
Members’ noncash contributions for construction costs and other		0	5
Change in noncash investments in equity method investees - net		2	0
Accrued but not paid for capital and other expenditures		1	3
Accrued preferred distributions		$ 6	$ 0
[1]	At March 31, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in May 2018.
[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.

Condensed Consolidated Stateme9

Condensed Consolidated Statements of Changes in Equity (Unaudited) - 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]
Net income (loss)		58	[1],[2],[3]				12		46	[1]
Other comprehensive income (loss)		3	[1],[4]					1	2	[1]
Related party contributions	[1]	309							309
Related party distributions	[1]	(60)							(60)
Changes in non-economic ownership interests and equity method investee	[1]	(1)							(1)
Distributions to unitholders		(19)	[1]				(19)
Ending balance, units at Mar. 31, 2017						54.2
Ending balance at Mar. 31, 2017		2,856	[1]				1,739	(2)	1,119	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accrued preferred distributions	[2]	$ 0
Beginning balance, units at Dec. 31, 2017		54.2		14		54.3
Beginning balance at Dec. 31, 2017		$ 2,208	[1],[5]		$ 548		1,639	1	20	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Related party note receivable	[1]	29							29
Net income (loss)		(21)	[1]		6		73		(100)	[1]
Other comprehensive income (loss)		1	[1]					0	1	[1]
Related party distributions	[1]	(64)							(64)
Changes in non-economic ownership interests and equity method investee	[1]	(6)							(6)
Differential membership investment activity		23							23
Distributions to unitholders		(28)	[1]		(6)		(22)
Adoption of accounting standards update		$ 1,423					9		1,414
Ending balance, units at Mar. 31, 2018		54.3		14		54.3
Ending balance at Mar. 31, 2018		$ 3,565	[1]		$ 548		$ 1,699	$ 1	$ 1,317	[1]
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Accrued preferred distributions		$ 6
[1]	At March 31, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in May 2018.
[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.
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Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 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 are 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 months ended March 31, 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 will no longer be treated as common control acquisitions and NEP's financial statements will no longer be retrospectively adjusted for such acquisitions.

Revenue

Revenue	3 Months Ended
	Mar. 31, 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 March 31, 2018 , is approximately $12 million and $55 million of revenue from contracts with customers for renewable energy sales and natural gas transportation services, respectively. At March 31, 2018 , NEP's accounts receivable balances related to contracts with customers was approximately $23 million . 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 March 31, 2018 , NEP expects to record approximately $2.0 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	3 Months Ended
	Mar. 31, 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. and Canadian projects, allocated by NEP OpCo. NEP's Canadian subsidiaries are all Canadian taxpayers, and therefore NEP recognizes 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. The effective tax rates for the three months ended March 31, 2018 and 2017 were approximately (950)% and 19% , 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 three months ended March 31, 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	3 Months Ended
	Mar. 31, 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: March 31, 2018 December 31, 2017 Level 1 Level 2 Total Level 1 Level 2 Total (millions) Assets: Cash equivalents $ 19 $ — $ 19 $ 61 $ — $ 61 Restricted cash equivalents (a) 21 — 21 31 — 31 Interest rate contracts — 44 44 — 15 15 Total assets $ 40 $ 44 $ 84 $ 92 $ 15 $ 107 Liabilities: Interest rate contracts $ — $ 125 $ 125 $ — $ 44 $ 44 Foreign currency contracts — 1 1 — 3 3 Total liabilities $ — $ 126 $ 126 $ — $ 47 $ 47 ____________________ (a) At March 31, 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: March 31, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value (millions) Long-term debt, including current maturities (a) $ 3,580 $ 3,541 $ 4,317 $ 4,456 ____________________ (a) At March 31, 2018 and December 31, 2017 , approximately $3,051 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). The March 31, 2018 carrying value excludes debt totaling approximately $690 million which is reflected in liabilities associated with assets held for sale on NEP's condensed consolidated balance sheets for which the carrying value approximates fair value. See Note 10 - Assets and Liabilities Associated with Assets Held for Sale.

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activity	3 Months Ended
	Mar. 31, 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 March 31, 2018 and December 31, 2017 , the combined notional amounts of the interest rate contracts were approximately $8,590 million and $3,609 million , respectively. At March 31, 2018 , NEP's AOCI included amounts related to discontinued cash flow hedges, which have expiration dates through 2033. At March 31, 2018 , approximately $5 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. NEP enters into certain foreign currency exchange contracts to economically hedge its cash flows from foreign currency rate fluctuations. At March 31, 2018 and December 31, 2017 , the notional amount of the foreign currency contracts was approximately $53 million and $62 million , respectively. During the three months ended March 31, 2018 and 2017 , NEP recorded approximately $1 million of gains and $1 million of losses, 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 expects to receive upon closing of the sale discussed in Note 10 - Assets and Liabilities Associated with Assets Held for Sale. 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 March 31, 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. March 31, 2018 Gross Basis Net Basis Assets Liabilities Assets Liabilities (millions) Interest rate contracts $ 44 $ 125 $ 26 $ 107 Foreign currency contracts — 1 — 1 Total fair values $ 44 $ 126 $ 26 $ 108 Net fair value by balance sheet line item: Other current assets $ 10 Assets held for sale 4 Other non-current assets 12 Current derivative liabilities $ 4 Liabilities associated with assets held for sale 6 Other non-current liabilities 98 Total derivatives $ 26 $ 108 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 Current derivative 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 March 31, 2018 2017 (millions) Interest rate contracts: Losses reclassified from AOCI to interest expense $ (2 ) $ (3 ) Losses recognized in interest expense $ (52 ) $ (2 ) 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 March 31, 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 $116 million and $17 million , respectively.

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 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 March 31, 2018 , NEP owned an approximately 34.9% limited partner interest in NEP OpCo and NEE Equity owned a noncontrolling 65.1% 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 March 31, 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 $2,816 million and $68 million , respectively, at March 31, 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 March 31, 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	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Capitalization	Capitalization Equity - On April 23, 2018 , the board of directors of NEP authorized a distribution of $ 0.42 per common unit payable on May 15, 2018 to its common unitholders of record on May 7, 2018 . 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 (millions, except per unit amounts) Numerator: Net income attributable to NEP – basic $ 73 Adjustments for convertible notes and preferred units 16 Net income attributable to NEP used to compute diluted earnings per unit $ 89 Denominator: Weighted-average number of common units outstanding – basic 54.3 Convertible notes and preferred units 19.7 Weighted-average number of common units outstanding – assuming dilution 74.0 Earnings per unit attributable to NEP: Basic $ 1.35 Assuming dilution $ 1.21

Accumulated Other Comprehensive

Accumulated Other Comprehensive Income (Loss)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Accumulated Other Comprehensive (Income) Loss	Accumulated Other Comprehensive Income (Loss) Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Three months ended March 31, 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 — (4 ) — (4 ) Other comprehensive income related to equity method investee — — 4 4 Net other comprehensive income (loss) 1 (4 ) 4 1 Balances, March 31, 2018 $ 2 $ (102 ) $ (26 ) $ (126 ) AOCI attributable to noncontrolling interest $ — $ (99 ) $ (28 ) $ (127 ) AOCI attributable to NEP $ 2 $ (3 ) $ 2 $ 1 Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Three months ended March 31, 2017 Balances, December 31, 2016 $ (4 ) $ (105 ) $ (35 ) $ (144 ) Amounts reclassified from AOCI to interest expense 2 — — 2 Other comprehensive income related to equity method investee — — 1 1 Net other comprehensive income 2 — 1 3 Balances, March 31, 2017 $ (2 ) $ (105 ) $ (34 ) $ (141 ) AOCI attributable to noncontrolling interest $ (3 ) $ (101 ) $ (35 ) $ (139 ) AOCI attributable to NEP $ 1 $ (4 ) $ 1 $ (2 )

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 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 months ended March 31, 2018 and 2017 include approximately $18 million and $16 million , respectively, related to the MSA. Cash Sweep and Credit Support Agreement - NEP OpCo is a party to a 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 months ended March 31, 2018 and 2017 include approximately $1 million and $1 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 March 31, 2018 and December 31, 2017 , the cash sweep amounts held in accounts belonging to NEER or its subsidiaries were approximately $89 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 March 31, 2018 , NEECH or NEER guaranteed or provided indemnifications, letters of credit or bonds totaling approximately $624 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 March 31, 2018 , NEER guaranteed a total of approximately $66 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 months ended March 31, 2018 and 2017 , NEP recognized approximately $2 million and $5 million , respectively, in revenues related to the transportation and fuel management agreements.

Summary of Significant Accounti

Summary of Significant Accounting and Reporting Policies	3 Months Ended
	Mar. 31, 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 $20 million and $19 million of other non-current assets on NEP's condensed consolidated balance sheets at March 31, 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. Assets and Liabilities Associated with Assets Held for Sale - In March 2018, a subsidiary of NEP entered into an agreement to sell its indirect ownership interest in four wind generation facilities and two solar generation facilities located in Ontario, Canada with a generating capacity totaling approximately 396 MW. The transaction is expected to close in the second quarter of 2018, pending the receipt of necessary regulatory approvals and satisfaction of other customary closing conditions. The carrying amounts of the major classes of assets and liabilities related to the facilities that were classified as held for sale on NEP's condensed consolidated balance sheets primarily represent property, plant and equipment and the related long-term debt. 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 months ended March 31, 2018 , approximately $38 million 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 three months ended March 31, 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 March 31, 2018 and December 31, 2017 , NEP's limited partner interest in NEP OpCo was approximately 34.9% . At March 31, 2018 , NEE's 65.1% 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. For the three months ended March 31, 2018 , the net income attributable to NEE's noncontrolling interest and to the non-affiliated party's 10% interest reduced the net income attributable to NEP unitholders. Additionally, the net loss attributable to differential membership interests increased the net income attributable to NEP unitholders and the net income attributable to NEE's noncontrolling interest. The net impact of the noncontrolling interests is reflected as net (income) loss attributable to noncontrolling interests in the condensed consolidated statements of income. 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. 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	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Contracts - At March 31, 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 March 31, 2018 , payments under these contracts were estimated as follows: Year Ending December 31, Commitments (millions) Remainder of 2018 $ 33 2019 36 2020 36 2021 37 2022 37 Thereafter 575 Total estimated payments $ 754 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 March 31, 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. Canadian FIT Contracts -The FIT contracts relating to NEP's wind projects located in Canada (Canadian projects) require suppliers to source a minimum percentage of their equipment and services from Ontario resident suppliers to meet the minimum required domestic content level (MRDCL). The MRDCL for two projects is 25% and the MRDCL for the other two projects is 50% . Following their respective CODs, the Canadian projects submitted reports to the Independent Electricity System Operator (IESO) summarizing how they achieved the MRDCL for their respective projects (domestic content reports) and the IESO issued letters to the Canadian projects acknowledging the completeness of their domestic content reports. The IESO has the right to audit the Canadian projects for a period of up to 7 years post-COD to confirm that they complied with the domestic content requirements under their respective FIT contracts and achieved their respective MRDCLs. The failure by any of these projects to achieve its MRDCL could result in a default by such project under its FIT contract, which default may not be possible to cure and could result in a termination of its FIT contract, without compensation, by the IESO. A termination of the FIT contract for any of these Canadian projects could negatively affect revenues generated by such project and have a material adverse effect on NEP's business, financial condition, results of operations and ability to make cash distributions to its unitholders. 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 three months ended March 31, 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 Accoun21

Summary of Significant Accounting and Reporting Policies (Policies)	3 Months Ended
	Mar. 31, 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. 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 $20 million and $19 million of other non-current assets on NEP's condensed consolidated balance sheets at March 31, 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. Assets and Liabilities Associated with Assets Held for Sale - In March 2018, a subsidiary of NEP entered into an agreement to sell its indirect ownership interest in four wind generation facilities and two solar generation facilities located in Ontario, Canada with a generating capacity totaling approximately 396 MW. The transaction is expected to close in the second quarter of 2018, pending the receipt of necessary regulatory approvals and satisfaction of other customary closing conditions. The carrying amounts of the major classes of assets and liabilities related to the facilities that were classified as held for sale on NEP's condensed consolidated balance sheets primarily represent property, plant and equipment and the related long-term debt. 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 months ended March 31, 2018 , approximately $38 million 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 three months ended March 31, 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 March 31, 2018 and December 31, 2017 , NEP's limited partner interest in NEP OpCo was approximately 34.9% . At March 31, 2018 , NEE's 65.1% 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. For the three months ended March 31, 2018 , the net income attributable to NEE's noncontrolling interest and to the non-affiliated party's 10% interest reduced the net income attributable to NEP unitholders. Additionally, the net loss attributable to differential membership interests increased the net income attributable to NEP unitholders and the net income attributable to NEE's noncontrolling interest. The net impact of the noncontrolling interests is reflected as net (income) loss attributable to noncontrolling interests in the condensed consolidated statements of income. 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. 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.

Fair Value Measurements (Tables

Fair Value Measurements (Tables)	3 Months Ended
	Mar. 31, 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: March 31, 2018 December 31, 2017 Level 1 Level 2 Total Level 1 Level 2 Total (millions) Assets: Cash equivalents $ 19 $ — $ 19 $ 61 $ — $ 61 Restricted cash equivalents (a) 21 — 21 31 — 31 Interest rate contracts — 44 44 — 15 15 Total assets $ 40 $ 44 $ 84 $ 92 $ 15 $ 107 Liabilities: Interest rate contracts $ — $ 125 $ 125 $ — $ 44 $ 44 Foreign currency contracts — 1 1 — 3 3 Total liabilities $ — $ 126 $ 126 $ — $ 47 $ 47 ____________________ (a) At March 31, 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: March 31, 2018 December 31, 2017 Carrying Value Fair Value Carrying Value Fair Value (millions) Long-term debt, including current maturities (a) $ 3,580 $ 3,541 $ 4,317 $ 4,456 ____________________ (a) At March 31, 2018 and December 31, 2017 , approximately $3,051 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). The March 31, 2018 carrying value excludes debt totaling approximately $690 million which is reflected in liabilities associated with assets held for sale on NEP's condensed consolidated balance sheets for which the carrying value approximates fair value. See Note 10 - Assets and Liabilities Associated with Assets Held for Sale.

Derivative Instruments and He23

Derivative Instruments and Hedging Activity (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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. March 31, 2018 Gross Basis Net Basis Assets Liabilities Assets Liabilities (millions) Interest rate contracts $ 44 $ 125 $ 26 $ 107 Foreign currency contracts — 1 — 1 Total fair values $ 44 $ 126 $ 26 $ 108 Net fair value by balance sheet line item: Other current assets $ 10 Assets held for sale 4 Other non-current assets 12 Current derivative liabilities $ 4 Liabilities associated with assets held for sale 6 Other non-current liabilities 98 Total derivatives $ 26 $ 108 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 Current derivative 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 March 31, 2018 2017 (millions) Interest rate contracts: Losses reclassified from AOCI to interest expense $ (2 ) $ (3 ) Losses recognized in interest expense $ (52 ) $ (2 )

Capitalization (Tables)

Capitalization (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [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 (millions, except per unit amounts) Numerator: Net income attributable to NEP – basic $ 73 Adjustments for convertible notes and preferred units 16 Net income attributable to NEP used to compute diluted earnings per unit $ 89 Denominator: Weighted-average number of common units outstanding – basic 54.3 Convertible notes and preferred units 19.7 Weighted-average number of common units outstanding – assuming dilution 74.0 Earnings per unit attributable to NEP: Basic $ 1.35 Assuming dilution $ 1.21

Accumulated Other Comprehensi25

Accumulated Other Comprehensive Income (Loss) (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of accumulated other comprehensive income (loss)	Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Three months ended March 31, 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 — (4 ) — (4 ) Other comprehensive income related to equity method investee — — 4 4 Net other comprehensive income (loss) 1 (4 ) 4 1 Balances, March 31, 2018 $ 2 $ (102 ) $ (26 ) $ (126 ) AOCI attributable to noncontrolling interest $ — $ (99 ) $ (28 ) $ (127 ) AOCI attributable to NEP $ 2 $ (3 ) $ 2 $ 1 Accumulated Other Comprehensive Income (Loss) Net Unrealized Net Unrealized Other Comprehensive Income (Loss) Related to Equity Method Investee Total (millions) Three months ended March 31, 2017 Balances, December 31, 2016 $ (4 ) $ (105 ) $ (35 ) $ (144 ) Amounts reclassified from AOCI to interest expense 2 — — 2 Other comprehensive income related to equity method investee — — 1 1 Net other comprehensive income 2 — 1 3 Balances, March 31, 2017 $ (2 ) $ (105 ) $ (34 ) $ (141 ) AOCI attributable to noncontrolling interest $ (3 ) $ (101 ) $ (35 ) $ (139 ) AOCI attributable to NEP $ 1 $ (4 ) $ 1 $ (2 )

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Other Commitments	At March 31, 2018 , payments under these contracts were estimated as follows: Year Ending December 31, Commitments (millions) Remainder of 2018 $ 33 2019 36 2020 36 2021 37 2022 37 Thereafter 575 Total estimated payments $ 754

Revenue (Details)

Revenue (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues over the remaining terms of the related contacts	$ 2,000
Renewable Energy Sales [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customer	12
Natural Gas Transportation Services [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from contract with customer	55
Customer Contracts [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Accounts receivable balances related to contracts with customers	$ 23

Income Taxes - Additional Discl

Income Taxes - Additional Disclosures (Details) - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Income Tax Contingency [Line Items]
Tax Cuts and Jobs Act of 2017, change in tax rate, deferred tax asset, income tax expense (benefit)			$ (101)
Effective tax rate (as a percent)	(950.00%)	19.00%
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

Fair Value Measurements - Asset

Fair Value Measurements - Assets and Liabilities Measured on a Recurring Basis (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Restricted Cash Equivalents, Noncurrent	$ 9	$ 7
Recurring Basis [Member]
Assets:
Cash equivalents	19	61
Restricted cash equivalents(a)	21	31
Interest rate contracts	44	15
Total assets	84	107
Liabilities:
Interest rate contracts	125	44
Foreign currency contracts	1	3
Total liabilities	126	47
Recurring Basis [Member] | Level 1 [Member]
Assets:
Cash equivalents	19	61
Restricted cash equivalents(a)	21	31
Interest rate contracts	0	0
Total assets	40	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(a)	0	0
Interest rate contracts	44	15
Total assets	44	15
Liabilities:
Interest rate contracts	125	44
Foreign currency contracts	1	3
Total liabilities	$ 126	$ 47

Fair Value Measurements - Carry

Fair Value Measurements - Carrying Value and Fair Value of Other Financial Instruments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Carrying Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current maturities	$ 3,580	$ 4,317
Level 2 [Member] | Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt, including current maturities	$ 3,541	$ 4,456

Fair Value Measurements - Addit

Fair Value Measurements - Additional Information (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Fair Value [Member] | Level 2 [Member]
Business Acquisition [Line Items]
Long-term debt, including current maturities	$ 3,541	$ 4,456
Fair Value [Member] | Market Approach [Member] | Level 2 [Member]
Business Acquisition [Line Items]
Long-term debt, including current maturities	3,051	$ 3,552
Liabilities Associated with Assets Held for Sale [Member]
Business Acquisition [Line Items]
Long-term debt	$ 690

Derivative Instruments and He32

Derivative Instruments and Hedging Activity - Additional Disclosures (Details) $ in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Apr. 30, 2018CAD ($)	Dec. 31, 2017USD ($)
Interest Rate Swap [Member]
Derivative [Line Items]
Notional amount	$ 8,590			$ 3,609
Net losses included in AOCI expected to be reclassified into interest expense within the next 12 months	5
Foreign Currency Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount	53			62
Losses related to foreign currency contract	1	$ (1)
Credit Risk Related Contingent Contracts [Member]
Derivative [Line Items]
Fair value of derivative instruments, liabilities	$ 116			$ 17
Subsequent Event [Member] | Foreign Currency Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional amount			$ 741

Derivative Instruments and He33

Derivative Instruments and Hedging Activity - Fair Value of Derivative Instruments Included in Balance Sheets (Details) - Cash Flow Hedges [Member] - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	$ 26	$ 18
Fair value of derivative instruments, liabilities	108	50
Other Current Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	10	10
Assets held for sale [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	4
Other Noncurrent Assets [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	12	8
Current Derivative Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	4	11
Liabilities Associated with Assets Held for Sale [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	6
Other Noncurrent Liabilities [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, liabilities	98	39
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	26	18
Fair value of derivative instruments, liabilities	107	47
Foreign Currency Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	0	0
Fair value of derivative instruments, liabilities	1	3
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	44	15
Fair value of derivative instruments, liabilities	126	47
Not Designated as Hedging Instrument [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	44	15
Fair value of derivative instruments, liabilities	125	44
Not Designated as Hedging Instrument [Member] | Foreign Currency Contract [Member]
Derivatives, Fair Value [Line Items]
Fair value of derivative instruments, assets	0	0
Fair value of derivative instruments, liabilities	$ 1	$ 3

Derivative Instruments and He34

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
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Losses reclassified from AOCI to interest expense	$ (2)	$ (3)
Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Losses recognized in interest expense	$ (52)	$ (2)

Variable Interest Entities (Det

Variable Interest Entities (Details) $ in Millions	Apr. 30, 2015equity_investmentshares	Mar. 31, 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		$ 5,239	$ 6,197	[1]
Deferral related to differential membership interests		$ 0	1,442	[1]
NEP OpCo [Member]
Variable Interest Entity [Line Items]
Limited partner interest percentage		34.90%
Noncontrolling limited partner interest percentage		65.10%
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		$ 2,816	2,840
Deferral related to differential membership interests		$ 68	$ 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%
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Capitalization - (Details)

Capitalization - (Details) - USD ($) $ / shares in Units, $ in Millions	Apr. 23, 2018	Mar. 31, 2018	Mar. 31, 2017
Numerator:
Net income attributable to NEP – basic		$ 73	$ 12	[1]
Adjustments for convertible notes and preferred units		16
Net income attributable to NEP used to compute diluted earnings per unit		$ 89
Denominator:
Weighted average number of common units outstanding - basic (in shares)		54,300,000	54,200,000	[1]
Convertible notes and preferred units (in shares)		19,700,000
Weighted-average number of common units outstanding – assuming dilution (in shares)		74,000,000	54,200,000	[1]
Earnings per unit attributable to NEP:
Basic (in shares)		$ 1.35	$ 0.22	[1]
Assuming dilution (in shares)		$ 1.21	$ 0.22
Subsequent Event [Member]
Debt Instrument [Line Items]
Distribution made to limited partner, distributions declared, per unit (in dollars per share)	$ 0.42
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.

Accumulated Other Comprehensi37

Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017		Dec. 31, 2017	[3]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period		$ (127)	$ (144)
Amounts reclassified from AOCI to interest expense		1	2
Net unrealized losses on foreign currency translation		(4)
Other comprehensive income (loss) related to equity method investee		4	1	[1]
Total other comprehensive income, net of tax	[2]	1	3	[1]
Balance, end of period		(126)	(141)
AOCI attributable to noncontrolling interest		(127)	(139)
AOCI attributable to NextEra Energy Partners		1	(2)		$ 1
Net Unrealized Gains (Losses) on Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period		1	(4)
Amounts reclassified from AOCI to interest expense		1	2
Net unrealized losses on foreign currency translation		0
Other comprehensive income (loss) related to equity method investee		0	0
Total other comprehensive income, net of tax		1	2
Balance, end of period		2	(2)
AOCI attributable to noncontrolling interest		0	(3)
AOCI attributable to NextEra Energy Partners		2	1
Net Unrealized Gains (Losses) on Foreign Currency Translation [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period		(98)	(105)
Amounts reclassified from AOCI to interest expense		0	0
Net unrealized losses on foreign currency translation		(4)
Other comprehensive income (loss) related to equity method investee		0	0
Total other comprehensive income, net of tax		(4)	0
Balance, end of period		(102)	(105)
AOCI attributable to noncontrolling interest		(99)	(101)
AOCI attributable to NextEra Energy Partners		(3)	(4)
Other Comprehensive Income (Loss) Related to Equity Method Investee [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance, beginning of period		(30)	(35)
Amounts reclassified from AOCI to interest expense		0	0
Net unrealized losses on foreign currency translation		0
Other comprehensive income (loss) related to equity method investee		4	1
Total other comprehensive income, net of tax		4	1
Balance, end of period		(26)	(34)
AOCI attributable to noncontrolling interest		(28)	(35)
AOCI attributable to NextEra Energy Partners		$ 2	$ 1
[1]	Prior-period financial information has been retrospectively adjusted as discussed in Note 1.
[2]	At March 31, 2018, approximately $6 million of preferred unit distributions were accrued and are payable in May 2018.
[3]	{F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOjZhMmRlOTAyZWEzZTQ3YTk5NDNjMGRmZTNlMmNjNjA3fFRleHRTZWxlY3Rpb246Njc3Q0FFNTY0QzczNUIyOUFFOEFCQjFGQTBFNjYwMDcM}

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Related Party Transaction [Line Items]
Due from related parties	$ 91		$ 88	[1]
Revenue from related parties	2	$ 5
Transportation and Fuel Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue from related parties	2
NextEra Energy, Inc. [Member] | Management Services Agreement [Member]
Related Party Transaction [Line Items]
Expenses from transactions with related party	18	16
NEER [Member] | Cash Sweep and Credit Support Agreement [Member]
Related Party Transaction [Line Items]
Interest expense	1	1
Due from related parties	$ 89		$ 87
Subsidiaries of NEER [Member] | Transportation and Fuel Management Agreement [Member]
Related Party Transaction [Line Items]
Revenue from related parties		$ 5
NEP OpCo [Member] | NextEra Energy, Inc. [Member] | Management Services Agreement [Member]
Related Party Transaction [Line Items]
Management fee, percent of EBITDA	1.00%
Annual management fee	$ 4
Management fee, additional payment threshold, minimum EBITDA	4
NEER [Member] | Guarantees [Member]
Related Party Transaction [Line Items]
Related party obligations	66
NextEra Energy Capital Holdings [Member] | Guarantees and Letters of Credit [Member]
Related Party Transaction [Line Items]
Total amount of letters of credit	$ 624
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Summary of Significant Accoun39

Summary of Significant Accounting and Reporting Policies - Narrative (Details) $ in Millions		3 Months Ended
		Mar. 31, 2018USD ($)wind_generation_facilitysolar_generation_facilityMW	Mar. 31, 2017USD ($)	[2]	Jan. 01, 2018USD ($)	Dec. 31, 2017USD ($)
Property, Plant and Equipment [Line Items]
Restricted cash, noncurrent		$ 20				$ 19
Net income (loss) attributable to noncontrolling interest	[1]	(100)	$ 46
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		$ 38
NEP OpCo [Member]
Property, Plant and Equipment [Line Items]
Noncontrolling interest, ownership percentage by parent		34.90%
Noncontrolling interest, ownership percentage by noncontrolling owners		65.10%
Non Affiliated Party [Member]
Property, Plant and Equipment [Line Items]
Noncontrolling interest, ownership percentage by noncontrolling owners		10.00%
Disposal Group, Held-for-sale or Disposed of by Sale, Not Discontinued Operations [Member]
Property, Plant and Equipment [Line Items]
Number of wind generation facilities | wind_generation_facility		4
Number of solar generation facilities | solar_generation_facility		2
Generation facility capacity | MW		396
[1]	For the three months ended March 31, 2017, 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.

Commitments and Contingencies -

Commitments and Contingencies - Contracts (Details) $ in Millions	Mar. 31, 2018USD ($)
Commitments and Contingencies Disclosure [Abstract]
Remainder of 2018	$ 33
2,019	36
2,020	36
2,021	37
2,022	37
Thereafter	575
Total estimated payments	$ 754

Commitments and Contingencies41

Commitments and Contingencies - Commitments (Details) $ in Millions	3 Months Ended
	Mar. 31, 2018USD ($)project
Operating Leased Assets [Line Items]
Payments for acquisition holdback	$ 200
Genesis [Member] | Surety Bond [Member]
Operating Leased Assets [Line Items]
Surety bond	$ 23
Minimum Required Domestic Content Level [Member]
Operating Leased Assets [Line Items]
Number of projects | project	2
Minimum MRDCL for two projects (as a percent)	25.00%
Minimum MRDCL for two Canadian FIT contracts (as a percent)	50.00%
MRDCL supply period	7 years

Commitments and Contingencies42

Commitments and Contingencies - Letters of Credit (Details) - Letters of Credit Due June and July 2022 [Member] - Standby Letters of Credit [Member] $ in Millions	Mar. 31, 2018USD ($)
Line of Credit Facility [Line Items]
Credit facility, maximum borrowing capacity	$ 82
Credit facility, amount outstanding	$ 68