Clearway Energy (CWEN.A) 10-Q 2 Nov 17 2017 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2017	Oct. 31, 2017
Class of Stock [Line Items]
Entity Registrant Name	NRG Yield LLC
Entity Central Index Key	1,637,757
Document Type	10-Q
Document Period End Date	Sep. 30, 2017
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q3
Common Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		34,586,250
Common Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		42,738,750
Common Class C [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		64,717,087
Common Class D [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		42,738,750

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Operating Revenues
Total operating revenues		$ 265		$ 272	[1],[2]	$ 767		$ 789	[1],[2]
Operating Costs and Expenses
Cost of operations		78		76	[1],[2]	239		238	[1],[2]
Depreciation and amortization		88		75	[1],[2]	241		224	[1],[2]
General and administrative		4		3	[1],[2]	14		8	[1],[2]
Acquisition-related transaction and integration costs		0		0	[2]	2		0	[2]
Total operating costs and expenses		170		154	[1],[2]	496		470	[1],[2]
Operating Income		95		118	[1],[2]	271		319	[1],[2]
Costs and Expenses [Abstract]
Equity in earnings of unconsolidated affiliates		28		16	[1],[2]	63		34	[1],[2],[3]
Other income, net		1		1	[1],[2]	3		3	[1],[2]
Interest expense		(72)		(68)	[1],[2]	(227)		(204)	[1],[2]
Total other expense, net		(43)		(51)	[1],[2]	(161)		(167)	[1],[2]
Net Income		52		67	[1],[2]	110		152	[1],[2],[3],[4]
Less: Net loss attributable to noncontrolling interests		(23)		(38)	[1],[2]	(56)		(67)	[1],[2]
Net Income Attributable to NRG Yield LLC		75		105	[1],[2]	166		219	[1],[2]
Consolidation, Eliminations [Member]
Operating Revenues
Total operating revenues		0	[5]	0	[6]	(1)	[5]	0	[6]
Operating Costs and Expenses
Cost of operations		0	[5]	0	[6]	(1)	[5]	0	[6]
Depreciation and amortization		0	[5]	0	[6]	0	[5]	0	[6]
General and administrative		0	[5]	0	[6]	0	[5]	0	[6]
Acquisition-related transaction and integration costs	[5]					0
Total operating costs and expenses		0	[5]	0	[6]	(1)	[5]	0	[6]
Operating Income		0	[5]	0	[6]	0	[5]	0	[6]
Costs and Expenses [Abstract]
Equity in earnings of unconsolidated affiliates		0	[5]	0	[6]	0	[5]	0	[6]
Other income, net		0	[5]	0	[6]	0	[5]	0	[6]
Interest expense		0	[5]	0	[6]	0	[5]	0	[6]
Total other expense, net		(130)	[5]	(182)	[6]	(324)	[5]	(424)	[6]
Net Income		(130)	[5]	(182)	[6]	(324)	[5]	(424)	[6],[7]
Less: Net loss attributable to noncontrolling interests		1	[5]	1	[6]	3	[5]	1	[6]
Net Income Attributable to NRG Yield LLC		$ (131)	[5]	$ (183)	[6]	$ (327)	[5]	$ (425)	[6]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016	[4]
Net Income	$ 52	$ 67	[1],[2]	$ 110	$ 152	[1],[2],[3]
Other Comprehensive Loss, net of tax
Unrealized gain (loss) on derivatives	7	20	[4],[5]	7	(49)	[5]
Other comprehensive gain (loss)	7	20	[4],[5]	7	(49)	[5]
Comprehensive Income	59	87	[4],[5]	117	103	[5]
Less: Comprehensive loss attributable to noncontrolling interests	(23)	(30)	[4],[5]	(56)	(67)	[5]
Comprehensive Income Attributable to NRG Yield LLC	$ 82	$ 117	[4],[5]	$ 173	$ 170	[5]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Sep. 30, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 178,000,000	$ 321,000,000	[1]
Restricted cash	140,000,000	165,000,000	[1]
Accounts receivable — trade	126,000,000	92,000,000	[1]
Accounts receivable — affiliate	1,000,000	1,000,000	[1]
Inventory	38,000,000	39,000,000	[1]
Notes receivable	15,000,000	16,000,000	[1]
Derivative instruments — affiliate	0	2,000,000
Prepayments and other current assets	22,000,000	20,000,000	[1]
Total current assets	520,000,000	656,000,000	[1]
Property, plant and equipment
Less accumulated depreciation	(1,189,000,000)	(951,000,000)
Property, plant and equipment, net	5,247,000,000	5,460,000,000	[1]
Other Assets
Equity investments in affiliates	1,183,000,000	1,152,000,000	[1]
Intangible assets, net	1,234,000,000	1,286,000,000	[1]
Derivative instruments	0	1,000,000
Other non-current assets	56,000,000	65,000,000	[1]
Total other assets	2,473,000,000	2,504,000,000	[1]
Total Assets	8,240,000,000	8,620,000,000	[1]
Current Liabilities
Current portion of long-term debt — external	300,000,000	291,000,000	[1]
Accounts payable — trade	27,000,000	23,000,000	[1]
Accounts payable — affiliate	45,000,000	40,000,000	[1]
Derivative instruments	23,000,000	32,000,000	[1]
Accrued expenses and other current liabilities	94,000,000	85,000,000	[1]
Total current liabilities	489,000,000	471,000,000	[1]
Other Liabilities
Long-term debt — external	4,914,000,000	5,098,000,000	[1]
Long-term debt — affiliate	618,000,000	618,000,000	[1]
Due to Related Parties, Noncurrent	3,000,000	9,000,000	[1]
Derivative instruments	43,000,000	44,000,000	[1]
Other non-current liabilities	87,000,000	76,000,000	[1]
Total non-current liabilities	5,665,000,000	5,845,000,000	[1]
Total Liabilities	6,154,000,000	6,316,000,000	[1]
Commitments and Contingencies	0	0
Members' Equity
Contributed capital	1,897,000,000	2,127,000,000	[1],[2]
Retained earnings	86,000,000	36,000,000	[1],[2]
Accumulated other comprehensive loss	(78,000,000)	(85,000,000)	[1],[2]
Noncontrolling interest	181,000,000	226,000,000	[2]
Total Members' Equity	2,086,000,000	2,304,000,000	[1],[2]
Total Liabilities and Members’ Equity	$ 8,240,000,000	$ 8,620,000,000	[1]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Consolidated Statements Of Cas

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	[1]
Cash Flows from Operating Activities
Net Income	$ 110	$ 152	[2],[3],[4]
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Equity in earnings of unconsolidated affiliates	63	34	[2],[4]
Distributions from unconsolidated affiliates	52	43
Depreciation and amortization	241	224
Amortization of financing costs	7	6
Amortization of intangibles and out-of-market contracts	52	57
Changes in derivative instruments	(2)	(5)
Loss on disposal of asset components	(8)	(5)
Changes in prepaid and accrued liabilities for tolling agreements	(5)	(2)
Changes in other working capital	(35)	(6)
Net Cash Provided by Operating Activities	375	444	[5]
Cash Flows from Investing Activities
Payments for the Drop Down Assets	176	77	[5]
Capital expenditures	(23)	(16)	[5]
Cash receipts from notes receivable	11	11	[5]
Return of investment from unconsolidated affiliates	32	16	[5]
Investments in unconsolidated affiliates	(48)	(69)	[5]
Net Cash Used in Investing Activities	(204)	(135)	[5]
Cash Flows from Financing Activities
Net contributions from noncontrolling interests	13	7
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(49)	(126)	[5]
Proceeds from the issuance of Class C units	33	0
Payments of distributions	(149)	(127)
Payments of debt issuance costs	(4)	(6)	[5]
Proceeds from the revolving credit facility	0	60	[5]
Payments for the revolving credit facility	0	366	[5]
Proceeds from the issuance of long-term debt — external	41	550	[5]
Payments for long-term debt	(224)	(204)	[5]
Net Cash Used in Financing Activities	(339)	(212)	[5]
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(168)	97	[5]
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	486	241	[5]
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 318	$ 338	[5]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Nature of Business

Nature of Business	9 Months Ended
	Sep. 30, 2017
Nature of Business Disclosure [Abstract]
Business Description and Basis of Presentation [Text Block]	Nature of Business NRG Yield LLC, together with its consolidated subsidiaries, or the Company, was formed by NRG as a Delaware limited liability company on March 5, 2013, to serve as the primary vehicle through which NRG owns, operates and acquires contracted renewable and conventional generation and thermal infrastructure assets. NRG owns 100% of NRG Yield LLC's Class B units and Class D units and receives distributions through its ownership of these units. Yield, Inc. owns 100% of NRG Yield LLC's Class A units and Class C units. The Company owns a diversified portfolio of contracted renewable and conventional generation and thermal infrastructure assets in the U.S. The Company’s contracted generation portfolio collectively represents 5,080 net MW as of September 30, 2017 . Each of these assets sells substantially all of its output pursuant to long-term offtake agreements with creditworthy counterparties. The weighted average remaining contract duration of these offtake agreements was approximately 16 years as of September 30, 2017 based on CAFD. The Company also owns thermal infrastructure assets with an aggregate steam and chilled water capacity of 1,319 net MWt and electric generation capacity of 123 net MW. These thermal infrastructure assets provide steam, hot and/or chilled water, and, in some instances, electricity to commercial businesses, universities, hospitals and governmental units in multiple locations, principally through long-term contracts or pursuant to rates regulated by state utility commissions. The following table represents the structure of the Company as of September 30, 2017 : On July 12, 2017, NRG announced that it had adopted and initiated a three-year, three-part improvement plan, or the NRG Transformation Plan. As part of the NRG Transformation Plan, NRG announced that it is exploring strategic alternatives for its renewables platform and its interest in Yield, Inc. NRG, through its holdings of Class B common stock and Class D common stock, has a 55.1% voting interest in Yield, Inc. and receives distributions from the Company through its ownership of Class B units and Class D units. NRG stated that the strategic alternatives span a variety of ownership structures and partnership types, including the potential partial or full monetization of NRG's renewables platform and NRG's interest in Yield, Inc. NRG is Yield, Inc.'s controlling stockholder and the Company has been highly dependent on NRG for, among other things, growth opportunities and management and administration services. See Part I, Item 1A, Risk Factors in the Company's 2016 Form 10-K, as well as Part II, Item 1A, Risk Factors in the Company's Form 10-Q for the quarter ended June 30, 2017, for risks related to the NRG Transformation Plan and the Company's relationship with NRG. As of September 30, 2017 , the Company's operating assets are comprised of the following projects: Projects Percentage Ownership Net Capacity (MW) (a) Offtake Counterparty Expiration Conventional El Segundo 100 % 550 Southern California Edison 2023 GenConn Devon 50 % 95 Connecticut Light & Power 2040 GenConn Middletown 50 % 95 Connecticut Light & Power 2041 Marsh Landing 100 % 720 Pacific Gas and Electric 2023 Walnut Creek 100 % 485 Southern California Edison 2023 1,945 Utility Scale Solar Agua Caliente 16 % 46 Pacific Gas and Electric 2039 Alpine 100 % 66 Pacific Gas and Electric 2033 Avenal 50 % 23 Pacific Gas and Electric 2031 Avra Valley 100 % 26 Tucson Electric Power 2032 Blythe 100 % 21 Southern California Edison 2029 Borrego 100 % 26 San Diego Gas and Electric 2038 CVSR 100 % 250 Pacific Gas and Electric 2038 Desert Sunlight 250 25 % 63 Southern California Edison 2035 Desert Sunlight 300 25 % 75 Pacific Gas and Electric 2040 Kansas South 100 % 20 Pacific Gas and Electric 2033 Roadrunner 100 % 20 El Paso Electric 2031 TA High Desert 100 % 20 Southern California Edison 2033 Utah Solar Portfolio (b) (e) 50 % 265 PacifiCorp 2036 921 Distributed Solar Apple I LLC Projects 100 % 9 Various 2032 AZ DG Solar Projects 100 % 5 Various 2025 - 2033 14 Wind Alta I 100 % 150 Southern California Edison 2035 Alta II 100 % 150 Southern California Edison 2035 Alta III 100 % 150 Southern California Edison 2035 Alta IV 100 % 102 Southern California Edison 2035 Alta V 100 % 168 Southern California Edison 2035 Alta X (b) 100 % 137 Southern California Edison 2038 Alta XI (b) 100 % 90 Southern California Edison 2038 Buffalo Bear 100 % 19 Western Farmers Electric Co-operative 2033 Crosswinds (b) (f) 99 % 21 Corn Belt Power Cooperative 2027 Elbow Creek (b) (f) 100 % 122 NRG Power Marketing LLC 2022 Elkhorn Ridge (b) (f) 66.7 % 54 Nebraska Public Power District 2029 Forward (b) (f) 100 % 29 Constellation NewEnergy, Inc. 2017 Goat Wind (b) (f) 100 % 150 Dow Pipeline Company 2025 Hardin (b) (f) 99 % 15 Interstate Power and Light Company 2027 Laredo Ridge 100 % 80 Nebraska Public Power District 2031 Lookout (b) (f) 100 % 38 Southern Maryland Electric Cooperative 2030 Projects Percentage Ownership Net Capacity (MW) (a) Offtake Counterparty Expiration Odin (b) (f) 99.9 % 20 Missouri River Energy Services 2028 Pinnacle 100 % 55 Maryland Department of General Services and University System of Maryland 2031 San Juan Mesa (b) (f) 75 % 90 Southwestern Public Service Company 2025 Sleeping Bear (b) (f) 100 % 95 Public Service Company of Oklahoma 2032 South Trent 100 % 101 AEP Energy Partners 2029 Spanish Fork (b) (f) 100 % 19 PacifiCorp 2028 Spring Canyon II (b) 90.1 % 29 Platte River Power Authority 2039 Spring Canyon III (b) 90.1 % 25 Platte River Power Authority 2039 Taloga 100 % 130 Oklahoma Gas & Electric 2031 Wildorado (b) (f) 100 % 161 Southwestern Public Service Company 2027 2,200 Thermal NRG Dover Energy Center LLC 100 % 103 NRG Power Marketing LLC 2018 Thermal generation 100 % 20 Various Various 123 Total net generation capacity (c) 5,203 Thermal equivalent MWt (d) 100 % 1,319 Various Various (a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2017 . (b) Projects are part of tax equity arrangements . (c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,209 MWs. (d) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 134 MWt available under the right-to-use provisions contained in agreements between two of the Company's thermal facilities and certain of its customers. (e) Represents interests in Four Brothers Solar, LLC, Granite Mountain Holdings, LLC, and Iron Springs Holdings, LLC, all acquired as part of the March 2017 Drop Down Assets (ownership percentage is based upon cash to be distributed). (f) Projects are part of NRG Wind TE Holdco portfolio. In addition to the facilities owned or leased in the table above, the Company entered into partnerships to own or purchase solar power generation projects, as well as other ancillary related assets from a related party via intermediate funds. The Company does not consolidate these partnerships and accounts for them as equity method investments. The Company's net interest in these projects is 226 MW based on cash to be distributed as of September 30, 2017 . For further discussions, refer to Note 4 , Investments Accounted for by the Equity Method and Variable Interest Entities of this Form 10-Q and Note 5 , Investments Accounted for by the Equity Method and Variable Interest Entities to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. Substantially all of the Company's generation assets are under long-term contractual arrangements for the output or capacity from these assets. The thermal assets are comprised of district energy systems and combined heat and power plants that produce steam, hot water and/or chilled water and, in some instances, electricity at a central plant. Certain district energy systems are subject to rate regulation by state public utility commissions (although they may negotiate certain rates) while the other district energy systems have rates determined by negotiated bilateral contracts. As described in Note 3 , Business Acquisitions , on August 1, 2017, the Company acquired the remaining 25% interest in NRG Wind TE Holdco, a portfolio of 12 wind projects, referred to as the August 2017 Drop Down Assets, from NRG for total cash consideration of $ 44 million , including working capital adjustment of $3 million . The purchase agreement also included potential additional payments to NRG dependent upon actual energy prices for merchant periods beginning in 2027, which were estimated and accrued as contingent consideration in the amount of $8 million as of September 30, 2017. On March 27, 2017, the Company acquired the following interests from NRG, referred to as the March 2017 Drop Down Assets: (i) Agua Caliente Borrower 2 LLC, which owns a 16% interest in the Agua Caliente solar farm, one of the ROFO assets and (ii) NRG's interests in seven utility-scale solar farms located in Utah that were part of NRG's November 2, 2016 acquisition of projects from SunEdison, or the Utah Solar Portfolio. The Company paid total cash consideration of $130 million , plus a $2 million working capital adjustment, and assumed non-recourse debt of $328 million , which is consolidated, as well as its pro-rata share of non-recourse project-level debt of $135 million . The acquisition was funded with cash on hand. The acquisitions of the August 2017 Drop Down Assets and March 2017 Drop Down Assets were accounted for as transfers of entities under common control. The accounting guidance requires retrospective combination of the entities for all periods presented as if the combinations had been in effect from the beginning of the financial statement period or from the date the entities were under common control (if later than the beginning of the financial statement period). The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the SEC’s regulations for interim financial information and with the instructions to Form 10-Q. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. The following notes should be read in conjunction with the accounting policies and other disclosures as set forth in the notes to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. Interim results are not necessarily indicative of results for a full year. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of September 30, 2017 , and the results of operations, comprehensive income (loss) and cash flows for the three and nine months ended September 30, 2017 and 2016 .

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could be different from these estimates. Accumulated Depreciation, Accumulated Amortization The following table presents the accumulated depreciation included in the property, plant and equipment, net, and accumulated amortization included in intangible assets, net, respectively, as of September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 (In millions) Property, Plant and Equipment Accumulated Depreciation $ 1,189 $ 951 Intangible Assets Accumulated Amortization 216 163 Noncontrolling Interests The following table reflects the changes in the Company's noncontrolling interest balance: (In millions) Balance as of December 31, 2016 as reported $ 313 Less: Adjustment for August 2017 Drop Down Assets (87 ) Balance as of December 31, 2016 as recast 226 Capital contributions from tax equity investors, net of distributions 11 Comprehensive loss (56 ) Balance as of September 30, 2017 $ 181 Distributions The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the nine months ended September 30, 2017 : Third Quarter 2017 Second Quarter 2017 First Quarter 2017 Distributions per Class A, B, C and D unit $ 0.28 $ 0.27 $ 0.26 On October 31, 2017 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.288 per unit payable on December 15, 2017 to unit holders of record as of December 1, 2017 . Changes in Capital Structure At-the-Market Equity Offering Program, or the ATM Program NRG Yield, Inc. is party to an equity distribution agreement with Barclays Capital Inc., Credit Suisse Securities (USA) LLC, J.P. Morgan Securities LLC and RBC Capital Markets, LLC, as sales agents. Pursuant to the terms of the equity distribution agreement, NRG Yield, Inc. may offer and sell shares of its Class C common stock par value $0.01 per share, from time to time through the sales agents up to an aggregate sales price of $150 million through an at-the-market equity offering program, or the ATM Program. NRG Yield, Inc. may also sell shares of its Class C common stock to any of the sales agents, as principals for its own account, at a price agreed upon at the time of sale. During the first nine months of 2017, Yield, Inc. issued 1,921,866 shares of Class C common stock under the ATM Program for gross proceeds of $35 million , with commission fees of $ 346 thousand . Yield, Inc. used the net proceeds to acquire 1,921,866 Class C units from the Company. At September 30, 2017 , approximately $115 million remains available for issuance under the ATM Program. Reclassifications Certain prior-year amounts have been reclassified for comparative purposes. Recent Accounting Developments ASU 2017-12 — In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815) , Targeted Improvements to Accounting for Hedging Activities, or ASU No. 2017-12. ASU No. 2017-12 amends ASU No. 2016-15. The amendments of ASU No. 2016-15 were issued to simplify the application of hedge accounting guidance and more closely aligning financial reporting for hedging relationships with economic results of an entity's risk management activities. The issues addressed by ASU No. 2017-12 include but are not limited to alignment of risk management activities and financial reporting, risk component hedging, accounting for the hedged item in fair value hedges of interest rate risk, recognition and presentation of the effects of hedging instruments, amounts excluded from the assessment of hedge effectiveness, and other simplifications of hedge accounting guidance. The amendments of ASU No. 2017-12 are effective for fiscal years beginning after December 15, 2018, and interim periods therein. Early adoption is permitted in any interim period and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The Company does not expect that the adoption of ASU No. 2017-12 will have a material impact on our consolidated results of operations, cash flows, and statement of financial position. ASU 2016-18 — In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230) , Restricted Cash, or ASU No. 2016-18. The amendments of ASU No. 2016-18 require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts on the statement of cash flows. The amendments of ASU No. 2016-18 are effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. Early adoption is permitted and the adoption of ASU No. 2016-18 will be applied retrospectively. The Company early adopted ASU No. 2016-18 during the second quarter of 2017. Net cash flows used in investing activities for the nine months ended September 30, 2016 decreased by $7 million. The sum of Company's cash and cash equivalents and restricted cash reported within the consolidated balance sheet as of December 31, 2016 equals the beginning balances of cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows for the nine months ended September 30, 2017. The sum of Company's cash and cash equivalents and restricted cash reported within the consolidated balance sheet as of September 30, 2017 equals to the ending balances of cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows for the nine months ended September 30, 2017. ASU 2016-02 — In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), or Topic 842, with the objective to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and to improve financial reporting by expanding the related disclosures. The guidance in Topic 842 provides that a lessee that may have previously accounted for a lease as an operating lease under current GAAP should recognize the assets and liabilities that arise from a lease on the balance sheet. In addition, Topic 842 expands the required quantitative and qualitative disclosures with regards to lease arrangements. The Company expects to adopt the standard effective January 1, 2019 utilizing the required modified retrospective approach for the earliest period presented. The Company expects to elect certain of the practical expedients permitted, including the expedient that permits the Company to retain its existing lease assessment and classification. The Company is currently working through an adoption plan and evaluating the anticipated impact on the Company's results of operations, cash flows and financial position. While the Company is currently evaluating the impact the new guidance will have on its financial position and results of operations, the Company expects to recognize lease liabilities and right of use assets. The extent of the increase to assets and liabilities associated with these amounts remains to be determined pending the Company’s review of its existing lease contracts and service contracts which may contain embedded leases. While this review is still in process, the Company believes the adoption of Topic 842 may be material to its financial statements. ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU No. 2014-09, which was further amended through various updates issued by the FASB thereafter. The amendments of ASU No. 2014-09 completed the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. The guidance under Topic 606 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes a five step model to be applied by an entity in evaluating its contracts with customers. The Company expects to adopt the standard effective January 1, 2018 and apply the guidance retrospectively to contracts at the date of adoption. The Company will recognize the cumulative effect of applying Topic 606 at the date of initial application, as prescribed under the modified retrospective transition method. The Company also expects to elect the practical expedient available under Topic 606 for measuring progress toward complete satisfaction of a performance obligation and for disclosure requirements of remaining performance obligations. The practical expedient allows an entity to recognize revenue in the amount to which the entity has the right to invoice such that the entity has a right to the consideration in an amount that corresponds directly with the value to the customer for performance completed to date by the entity. The majority of the Company's revenues are obtained through PPAs, which are currently accounted for as operating leases. In connection with the implementation of Topic 842, as described above, the Company expects to elect certain of the practical expedients permitted, including the expedient that permits the Company to retain its existing lease assessment and classification. As leases are excluded from the scope of Topic 606, the Company expects the standard to have an immaterial impact on the Company's results of operations, cash flows and financial position.

Business Acquisitions Business

Business Acquisitions Business Acquisitions (Notes)	9 Months Ended
	Sep. 30, 2017
Business Acquisitions [Abstract]
Mergers, Acquisitions and Dispositions Disclosures [Text Block]	Business Acquisitions 2017 Acquisitions November 2017 Drop Down Assets — On November 1, 2017, the Company acquired a 38 MW solar portfolio primarily comprised of assets from NRG's Solar Power Partners (SPP) funds and other projects developed by NRG , for cash consideration of $71 million , excluding working capital adjustments, plus assumed non-recourse debt of $26 million . As of September 30, 2017, the November 2017 Drop Down Assets' debt was $33 million , of which $7 million was paid by NRG in October 2017. The purchase price for the November 2017 Drop Down Assets was funded with cash on hand. The assets and liabilities transferred to the Company relate to interests under common control by NRG and were recorded at historical cost in accordance with ASC 805-50, Business Combinations - Related Issues . The difference between the cash paid and historical value of the entities' equity was recorded as an adjustment to contributed capital. Because the transaction constituted a transfer of net assets under common control, the guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect since the inception of common control. The following is a summary of assets and liabilities transferred in connection with the acquisition of the November 2017 Drop Down Assets as of September 30, 2017: (In millions) Assets: Current assets $ 11 Property, plant and equipment 84 Non-current assets 32 Total assets 127 Liabilities: Debt (Current and non-current) (a) 31 Other current and non-current liabilities 3 Total liabilities assumed 34 Net assets acquired $ 93 (a) Net of $2 million of net debt issuance costs. Supplemental Pro Forma Information As described above, the Company's acquisition of the November 2017 Drop Down Assets was accounted for as a transfer of entities under common control. The following unaudited supplemental pro forma information represents the consolidated results of operations as if the Company acquired the November 2017 Drop Down Assets on January 1, 2016, including the impact of acquisition accounting with respect to NRG's acquisition of the projects. For the three months ended For the nine months ended September 30, 2017 September 30, 2016 September 30, 2017 September 30, 2016 Total operating revenues $ 269 $ 275 $ 777 $ 798 Net income 30 69 90 155 August 2017 Drop Down Assets — On August 1, 2017, the Company acquired the remaining 25% interest in NRG Wind TE Holdco, a portfolio of 12 wind projects, from NRG for total cash consideration of $44 million , including working capital adjustment of $ 3 million . The purchase agreement also included potential additional payments to NRG dependent upon actual energy prices for merchant periods beginning in 2027, which were estimated and accrued as contingent consideration in the amount of $8 million as of September 30, 2017. The Company originally acquired 75% of NRG Wind TE Holdco on November 3, 2015, or November 2015 Drop Down Assets, which were consolidated with 25% of the net assets recorded as noncontrolling interest. The assets and liabilities transferred to the Company related to interests under common control by NRG and were recorded at historical cost in accordance with ASC 805-50, Business Combination - Related Issues. The difference between the cash paid of $44 million , net of the contingent consideration of $8 million , and the historical value of the remaining 25% of $87 million as of July 31, 2017, was recorded as an adjustment to NRG's contributed capital. Since the transaction constituted a transfer of entities under common control, the accounting guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect from the beginning of the financial statement period or from the date the entities were under common control (if later than the beginning of the financial statement period). March 2017 Drop Down Assets — On March 27, 2017, the Company acquired the following interests from NRG: (i) Agua Caliente Borrower 2 LLC, which owns a 16% interest (approximately 31% of NRG's 51% interest) in the Agua Caliente solar farm, one of the ROFO Assets, representing ownership of approximately 46 net MW of capacity and (ii) NRG's interests in the Utah Solar Portfolio. Agua Caliente is located in Yuma County, AZ and sells power subject to a 25 -year PPA with Pacific Gas and Electric, with 22 years remaining on that contract. The seven utility-scale solar farms in the Utah Solar Portfolio are owned by the following entities: Four Brothers Capital, LLC, Iron Springs Capital, LLC, and Granite Mountain Capital, LLC. These utility-scale solar farms achieved commercial operations in 2016, sell power subject to 20 -year PPAs with PacifiCorp, a subsidiary of Berkshire Hathaway and are part of a tax equity structure with Dominion Solar Projects III, Inc., or Dominion, through which the Company is entitled to receive 50% of cash to be distributed, as further described below. The Company paid cash consideration of $130 million , plus $2 million of working capital paid through September 30, 2017. The acquisition of the March 2017 Drop Down Assets was funded with cash on hand. The Company recorded the acquired interests as equity method investments. The Company also assumed non-recourse debt of $41 million and $287 million on Agua Caliente Borrower 2 LLC and the Utah Solar Portfolio, respectively, as further described in Note 7 , Long-term Debt , as well as its pro-rata share of non-recourse project-level debt of Agua Caliente Solar LLC, as further described in Note 4 , Investments Accounted for by the Equity Method and Variable Interest Entities . The assets and liabilities transferred to the Company relate to interests under common control by NRG and were recorded at historical cost in accordance with ASC 805-50, Business Combination - Related Issues. The difference between the cash paid and the historical value of the entities' equity of $8 million was recorded as an adjustment to contributed capital. Since the transaction constituted a transfer of entities under common control, the accounting guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect from the beginning of the financial statement period or from the date the entities were under common control (if later than the beginning of the financial statement period). Accordingly, in connection with the retrospective adjustment of prior periods, the Company adjusted its financial statements to reflect its results of operations, financial position and cash flows as if it recorded its interests in the Agua Caliente Borrower 2 LLC on January 1, 2016, and its interests in the Utah Solar Portfolio on November 2, 2016. The following is a summary of assets and liabilities transferred in connection with the acquisition of the March 2017 Drop Down Assets as of March 27, 2017: (In millions) Assets: Cash $ 6 Equity investment in projects 456 Total assets acquired 462 Liabilities: Debt (Current and non-current) (a) 320 Other current and non-current liabilities 3 Total liabilities assumed 323 Net assets acquired $ 139 (a) Net of $8 million of debt issuance costs. The following tables present a summary of the Company's historical information combining the financial information for the March 2017 Drop Down Assets and August 2017 Drop Down Assets transferred in connection with the acquisition: Three months ended September 30, 2016 Nine months ended September 30, 2016 As Previously Reported March 2017 Drop Down Assets August 2017 Drop Down Assets As Currently Reported As Previously Reported March 2017 Drop Down Assets August 2017 Drop Down Assets As Currently Reported (In millions) Total operating revenues $ 272 $ — $ — $ 272 $ 789 $ — $ — $ 789 Operating income 118 — — 118 319 — — 319 Net income 64 3 — 67 147 5 — 152 Net income attributable to Yield LLC 100 3 2 105 209 5 5 219 2016 Acquisitions CVSR Drop Down — Prior to September 1, 2016, the Company had a 48.95% interest in CVSR, which was accounted for as an equity method investment. On September 1, 2016, the Company acquired from NRG the remaining 51.05% interest of CVSR Holdco LLC, which indirectly owns the CVSR solar facility, for total cash consideration of $78.5 million plus an immaterial working capital adjustment. The Company also assumed additional debt of $496 million , which represents 51.05% of the CVSR project level debt and 51.05% of the notes issued under the CVSR Holdco Financing Agreement, as of the closing date, as further described in Note 10 , Long-term Debt , to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. The acquisition was funded with cash on hand. The assets and liabilities transferred to the Company relate to interests under common control by NRG and were recorded at historical cost in accordance with ASC 805-50, Business Combinations - Related Issues . The difference between the cash paid and historical value of the CVSR Drop Down of $112 million , as well as $6 million of AOCL, was recorded as a distribution to NRG with the offset to contributed capital. Because the transaction constituted a transfer of net assets under common control, the guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect since the inception of common control. In connection with the retrospective adjustment of prior periods, the Company now consolidates CVSR and 100% of its debt, consisting of $771 million of project level debt and $200 million of notes issued under the CVSR Holdco Financing Agreement as of September 1, 2016. In connection with the retrospective adjustment of prior periods, the Company has removed the equity method investment from all prior periods and adjusted its financial statements to reflect its results of operations, financial position and cash flows as if it had consolidated CVSR from the beginning of the financial statement period.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2017
Equity Method Investments and Joint Ventures [Abstract]
Investments Accounted for by the Equity Method and Variable Interest Entities	Investments Accounted for by the Equity Method and Variable Interest Entities Entities that are Consolidated The Company has a controlling financial interest in certain entities which have been identified as VIEs under ASC 810, Consolidations, or ASC 810. These arrangements are primarily related to tax equity arrangements entered into with third parties in order to monetize certain tax credits associated with wind facilities, as further described in Note 5 , Investments Accounted for by the Equity Method and Variable Interest Entities , to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. Summarized financial information for the Company's consolidated VIEs consisted of the following as of September 30, 2017 : (In millions) NRG Wind TE Holdco Alta Wind TE Holdco Spring Canyon Other current and non-current assets $ 175 $ 17 $ 4 Property, plant and equipment 417 443 96 Intangible assets 2 265 — Total assets 594 725 100 Current and non-current liabilities 206 9 6 Total liabilities 206 9 6 Noncontrolling interest 22 96 63 Net assets less noncontrolling interests $ 366 $ 620 $ 31 Entities that are not Consolidated The Company has interests in entities that are considered VIEs under ASC 810, but for which it is not considered the primary beneficiary. The Company accounts for its interests in these entities under the equity method of accounting, as further described in Note 5 , Investments Accounted for by the Equity Method and Variable Interest Entities , to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. The Company's maximum exposure to loss as of September 30, 2017 is limited to its equity investment in the unconsolidated entities, as further summarized in the table below: (In millions) Maximum exposure to loss Four Brothers Solar, LLC $ 221 Granite Mountain Holdings, LLC 81 Iron Springs Holdings, LLC 56 GenConn Energy LLC 102 NRG DGPV Holdco 1 LLC 71 NRG RPV Holdco 1 LLC 65 NRG DGPV Holdco 2 LLC 54 NRG DGPV Holdco 3 LLC 20 NRG DGPV Holdco 2 LLC — The Company contributed $ 37 million into NRG DGPV Holdco 2 LLC, or DGPV Holdco 2 during the nine months ended September 30, 2017 , with an additional $2 million due to NRG in accounts payable — affiliate as of September 30, 2017 , to be funded in tranches as the project milestones are completed. The Company co-owns approximately 107 MW of distributed solar capacity, based on cash to be distributed, with a weighted average contract life of approximately 21 years as of September 30, 2017 . On October 12, 2017, the Company and NRG amended the DGPV Holdco 2 partnership agreement to increase the aggregate commitment of $50 million to $60 million in order to accommodate funding of additional projects. NRG DGPV Holdco 3 LLC — On September 26, 2017, the Company entered into an additional partnership with NRG by forming NRG DGPV Holdco 3 LLC, or DGPV Holdco 3, in which the Company would invest up to $50 million in an operating portfolio of distributed solar assets, primarily comprised of community solar projects, developed by NRG. The Company invested $4 million during September 2017 with an additional $16 million due to NRG in accounts payable - affiliate as of September 30, 2017 , to be funded in tranches as the project milestones are completed. The Company co-owns approximately 33 MW of distributed solar capacity, based on cash to be distributed, with a weighted average contract life of approximately 20 years as of September 30, 2017 . Utah Solar Portfolio — As described in Note 3, Business Acquisitions , on March 27, 2017, as part of the March 2017 Drop Down Assets acquisition, the Company acquired from NRG 100% of the Class A equity interests in the Utah Solar Portfolio, comprised of Four Brothers Solar, LLC, Granite Mountain Holdings, LLC, and Iron Springs Holdings, LLC. The Class B interests of the Utah Solar Portfolio are owned by a tax equity investor, or TE Investor, who receives 99% of allocations of taxable income and other items until the flip point, which occurs when the TE Investor obtains a specified return on its initial investment, at which time the allocations to the TE Investor change to 50% . The Company generally receives 50% of distributable cash throughout the term of the tax-equity arrangements. The three entities comprising the Utah Solar Portfolio are VIEs. As the Company is not the primary beneficiary, the Company uses the equity method of accounting to account for its interests in the Utah Solar Portfolio. The Company utilizes the HLBV method to determine its share of the income or losses in the investees. The following tables present summarized financial information for the Utah Solar Portfolio: Three months ended September 30, Nine months ended September 30, (In millions) 2017 2016 2017 2016 Income Statement Data: Utah Solar Portfolio Operating revenues $ 23 $ — $ 60 $ — Operating income 9 — 17 — Net income 9 — 17 — September 30, 2017 December 31, 2016 Balance Sheet Data: (In millions) Utah Solar Portfolio Current assets $ 25 $ 20 Non-current assets 1,091 1,105 Current liabilities 9 14 Non-current liabilities 21 38 Non-recourse project-level debt of unconsolidated affiliates Agua Caliente Financing — As described in Note 3 , Business Acquisitions , the Company acquired a 16% interest in the Agua Caliente solar facility through its acquisition of Agua Caliente Borrower 2 LLC. As of September 30, 2017 , Agua Caliente Solar LLC, the direct owner of the Agua Caliente solar facility, had $833 million outstanding under the Agua Caliente financing agreement with the Federal Financing Bank, or FFB, borrowed to finance the costs of constructing the facility. The Company's pro-rata share of the Agua Caliente financing arrangement was $133 million as of September 30, 2017 . Amounts borrowed under the Agua Caliente financing agreement accrue interest at a fixed rate based on U.S. Treasury rates plus a spread of 0.375% , mature in 2037 and are secured by the assets of Agua Caliente Solar LLC. The loans provided by the FFB are guaranteed by the U.S. DOE.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2017
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments Fair Value Accounting under ASC 820 ASC 820 establishes a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three levels as follows: • Level 1—quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access as of the measurement date. • Level 2—inputs other than quoted prices included within Level 1 that are directly observable for the asset or liability or indirectly observable through corroboration with observable market data. • Level 3—unobservable inputs for the asset or liability only used when there is little, if any, market activity for the asset or liability at the measurement date. In accordance with ASC 820, the Company determines the level in the fair value hierarchy within which each fair value measurement in its entirety falls, based on the lowest level input that is significant to the fair value measurement. For cash and cash equivalents, restricted cash, accounts receivable, accounts receivable — affiliate, accounts payable, current portion of the accounts payable — affiliates, accrued expenses and other liabilities, the carrying amounts approximate fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy. The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows: As of September 30, 2017 As of December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value (In millions) Assets: Notes receivable (a) $ 18 $ 18 $ 30 $ 30 Liabilities: Long-term debt — affiliate 618 626 618 608 Long-term debt — external, including current portion (b) $ 5,268 $ 5,301 $ 5,451 $ 5,435 (a) Includes the long-term portion of notes receivable, which is recorded in other noncurrent assets on the Company's consolidated balance sheets. (b) Excludes deferred financing costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets. The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non-publicly traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of September 30, 2017 and December 31, 2016 : As of September 30, 2017 As of December 31, 2016 Level 2 Level 3 Level 2 Level 3 (In millions) Long-term debt, including current portion $ 884 $ 5,043 $ 833 $ 5,210 Recurring Fair Value Measurements The Company records its derivative assets and liabilities at fair value on its consolidated balance sheet. The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy: As of September 30, 2017 As of December 31, 2016 Fair Value (a) Fair Value (a) Fair Value (a) (In millions) Level 2 Level 1 Level 2 Derivative assets: Commodity contracts $ — $ 1 $ 1 Interest rate contracts — — 1 Total assets — 1 2 Derivative liabilities: Commodity contracts 2 — 1 Interest rate contracts 64 — 75 Total liabilities $ 66 $ — $ 76 (a) There were no derivative assets or liabilities classified as Level 1 as of September 30, 2017 . There were no derivative assets or liabilities classified as Level 3 as of September 30, 2017 and December 31, 2016 . Derivative Fair Value Measurements The Company's contracts are non-exchange-traded and valued using prices provided by external sources. For the Company’s energy markets, management receives quotes from multiple sources. To the extent that multiple quotes are received, the prices reflect the average of the bid-ask mid-point prices obtained from all sources believed to provide the most liquid market for the commodity. The fair value of each contract is discounted using a risk free interest rate. In addition, a credit reserve is applied to reflect credit risk, which is, for interest rate swaps, calculated based on credit default swaps using the bilateral method. For commodities, to the extent that the net exposure under a specific master agreement is an asset, the Company uses the counterparty’s default swap rate. If the net exposure under a specific master agreement is a liability, the Company uses NRG's default swap rate. For interest rate swaps and commodities, the credit reserve is added to the discounted fair value to reflect the exit price that a market participant would be willing to receive to assume the liabilities or that a market participant would be willing to pay for the assets. As of September 30, 2017 , the credit reserve resulted in a $1 million increase in fair value in interest expense. It is possible that future market prices could vary from those used in recording assets and liabilities and such variations could be material. Concentration of Credit Risk In addition to the credit risk discussion in Note 2 , Summary of Significant Accounting Policies , to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K, the following is a discussion of the concentration of credit risk for the Company's financial instruments. Credit risk relates to the risk of loss resulting from non-performance or non-payment by counterparties pursuant to the terms of their contractual obligations. The Company monitors and manages credit risk through credit policies that include: (i) an established credit approval process; (ii) daily monitoring of counterparties' credit limits; (iii) the use of credit mitigation measures such as margin, collateral, prepayment arrangements, or volumetric limits; (iv) the use of payment netting agreements; and (v) the use of master netting agreements that allow for the netting of positive and negative exposures of various contracts associated with a single counterparty. Risks surrounding counterparty performance and credit could ultimately impact the amount and timing of expected cash flows. The Company seeks to mitigate counterparty risk by having a diversified portfolio of counterparties. Counterparty credit exposure includes credit risk exposure under certain long-term agreements, including solar and other PPAs. As external sources or observable market quotes are not available to estimate such exposure, the Company estimates the exposure related to these contracts based on various techniques including, but not limited to, internal models based on a fundamental analysis of the market and extrapolation of observable market data with similar characteristics. Based on these valuation techniques, as of September 30, 2017 , credit risk exposure to these counterparties attributable to the Company's ownership interests was approximately $2.9 billion for the next five years . The majority of these power contracts are with utilities with strong credit quality and public utility commission or other regulatory support. However, such regulated utility counterparties can be impacted by changes in government regulations, which the Company is unable to predict.

Accounting for Derivative Instr

Accounting for Derivative Instruments and Hedging Activities (Notes)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Accounting for Derivative Instruments and Hedging Activities	Accounting for Derivative Instruments and Hedging Activities This footnote should be read in conjunction with the complete description under Note 7 , Accounting for Derivative Instruments and Hedging Activities , to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. Energy-Related Commodities As of September 30, 2017 , the Company had energy-related derivative instruments extending through 2020. At September 30, 2017 , these contracts were not designated as cash flow or fair value hedges. Interest Rate Swaps As of September 30, 2017 , the Company had interest rate derivative instruments on non-recourse debt extending through 2036, a portion of which are designated as cash flow hedges. Volumetric Underlying Derivative Transactions The following table summarizes the net notional volume buy of the Company's open derivative transactions broken out by commodity: Total Volume September 30, 2017 December 31, 2016 Commodity Units (In millions) Natural Gas MMBtu 2 3 Interest Dollars $ 1,983 $ 2,070 Fair Value of Derivative Instruments There were no derivative asset positions on the balance sheet as of September 30, 2017 . The following table summarizes the fair value within the derivative instrument valuation on the balance sheet: Fair Value Derivative Assets Derivative Liabilities December 31, 2016 September 30, 2017 December 31, 2016 (In millions) Derivatives Designated as Cash Flow Hedges: Interest rate contracts current $ — $ 7 $ 26 Interest rate contracts long-term 1 13 39 Total Derivatives Designated as Cash Flow Hedges 1 20 65 Derivatives Not Designated as Cash Flow Hedges : Interest rate contracts current — 15 5 Interest rate contracts long-term — 29 5 Commodity contracts current 2 1 1 Commodity contracts long-term — 1 — Total Derivatives Not Designated as Cash Flow Hedges 2 46 11 Total Derivatives $ 3 $ 66 $ 76 The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. As of September 30, 2017 , there were no offsetting amounts at the counterparty master agreement level nor outstanding collateral paid or received. As of December 31, 2016 , there was no outstanding collateral paid or received. The following tables summarize the offsetting of derivatives by the counterparty master agreement level as of December 31, 2016 : As of December 31, 2016 Gross Amounts of Recognized Assets/Liabilities Derivative Instruments Net Amount Commodity contracts: (In millions) Derivative assets $ 2 $ — $ 2 Derivative liabilities (1 ) — (1 ) Total commodity contracts 1 — 1 Interest rate contracts: Derivative assets 1 (1 ) — Derivative liabilities (75 ) 1 (74 ) Total interest rate contracts (74 ) — (74 ) Total derivative instruments $ (73 ) $ — $ (73 ) Accumulated Other Comprehensive Loss The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives : Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 (In millions) Accumulated OCL beginning balance $ (86 ) $ (168 ) $ (86 ) $ (99 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 5 6 13 13 Mark-to-market of cash flow hedge accounting contracts 2 14 (6 ) (62 ) Accumulated OCL ending balance (79 ) (148 ) (79 ) (148 ) Accumulated OCL attributable to noncontrolling interests (1 ) (2 ) (1 ) (2 ) Accumulated OCL attributable to NRG Yield LLC $ (78 ) $ (146 ) $ (78 ) $ (146 ) Losses expected to be realized from OCL during the next 12 months $ 17 $ 17 Amounts reclassified from accumulated OCL into income and amounts recognized in income from the ineffective portion of cash flow hedges are recorded to interest expense. There was no ineffectiveness for the nine months ended September 30, 2017 and 2016 . Accounting guidelines require a high degree of correlation between the derivative and the hedged item throughout the period in order to qualify as a cash flow hedge. As of December 31, 2016, the Company's regression analysis for Viento Funding II interest rate swaps, while positively correlated, did not meet the required threshold for cash flow hedge accounting. As a result, the Company de-designated the Viento Funding II cash flow hedges as of December 31, 2016, and will prospectively mark these derivatives to market through the income statement. The Company's regression analysis for Marsh Landing, Walnut Creek and Avra Valley interest rate swaps, while positively correlated, no longer contain matching terms for cash flow hedge accounting. As a result, the Company voluntarily de-designated the Marsh Landing, Walnut Creek and Avra Valley cash flow hedges as of April 28, 2017, and will prospectively mark these derivatives to market through the income statement. Impact of Derivative Instruments on the Statements of Income The Company has interest rate derivative instruments that are not designated as cash flow hedges. The effect of interest rate hedges is recorded to interest expense. For the three months ended September 30, 2017 and 2016 , the impact to the consolidated statements of income was a gain of $7 million and $2 million , respectively. For the nine months ended September 30, 2017 and 2016 , the impact to the consolidated statements of income was a loss of $2 million and $7 million , respectively. A portion of the Company’s derivative commodity contracts relates to its Thermal Business for the purchase of fuel commodities based on the forecasted usage of the thermal district energy centers. Realized gains and losses on these contracts are reflected in the fuel costs that are permitted to be billed to customers through the related customer contracts or tariffs and, accordingly, no gains or losses are reflected in the consolidated statements of income for these contracts. See Note 5 , Fair Value of Financial Instruments , for a discussion regarding concentration of credit risk.

Long-term Debt

Long-term Debt	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt This footnote should be read in conjunction with the complete description under Note 10 , Long-term Debt , to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. Long-term debt consisted of the following: September 30, 2017 December 31, 2016 September 30, 2017, interest rate % (a) Letters of Credit Outstanding at September 30, 2017 (In millions, except rates) Long-term debt - affiliate, due 2019 $ 337 $ 337 3.580 Long-term debt - affiliate, due 2020 281 281 3.325 2024 Senior Notes 500 500 5.375 2026 Senior Notes 350 350 5.000 Project-level debt: Agua Caliente Borrower 2, due 2038 41 — 5.430 17 Alpine, due 2022 138 145 L+1.750 37 Alta Wind I - V lease financing arrangements, due 2034 and 2035 940 965 5.696 - 7.015 103 CVSR, due 2037 746 771 2.339 - 3.775 — CVSR Holdco Notes, due 2037 194 199 4.680 13 El Segundo Energy Center, due 2023 400 443 L+1.75 - L+2.375 102 Energy Center Minneapolis, due 2017 and 2025 82 96 5.950 -7.250 — Energy Center Minneapolis Series D Notes, due 2031 125 125 3.550 — Laredo Ridge, due 2028 96 100 L+1.875 10 Marsh Landing, due 2017 and 2023 334 370 L+1.750 - L+1.875 34 Tapestry, due 2021 165 172 L+1.625 20 Utah Solar Portfolio, due 2022 284 287 L+2.625 13 Viento, due 2023 169 178 L+3.00 27 Walnut Creek, due 2023 279 310 L+1.625 49 Other 425 440 Various 37 Subtotal project-level debt: 4,418 4,601 Total debt 5,886 6,069 Less current maturities (300 ) (291 ) Less net debt issuance costs (54 ) (62 ) Total long-term debt $ 5,532 $ 5,716 (a) As of September 30, 2017 , L+equals 3 month LIBOR plus x%, except for the Utah Solar Portfolio, where L+equals 1 month LIBOR plus x% The financing arrangements listed above contain certain covenants, including financial covenants that the Company is required to be in compliance with during the term of the respective arrangement. As of September 30, 2017 , the Company was in compliance with all of the required covenants. The discussion below describes material changes to or additions of long-term debt for the nine months ended September 30, 2017 . NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility As of September 30, 2017 , there were no outstanding borrowings under the revolving credit facility and the Company had $68 million of letters of credit outstanding. Thermal Financing On March 16, 2017, NRG Energy Center Minneapolis LLC, a subsidiary of NRG Thermal LLC, amended the shelf facility of its existing Thermal financing arrangement to allow for the issuance of an additional $10 million of Series F notes at a 4.60% interest rate, or Series F Notes, increasing the total principal amount of notes available for issuance under the shelf facility to $80 million . The Series F Notes will be secured by substantially all of the assets of NRG Energy Center Minneapolis LLC. NRG Thermal LLC has guaranteed the indebtedness and its guarantee is secured by a pledge of the equity interests in all of NRG Thermal LLC’s subsidiaries. Financing Related to the March 2017 Drop Down Assets Agua Caliente Borrower 2, due 2038 On February 17, 2017, Agua Caliente Borrower 1 LLC, an indirect subsidiary of NRG, and Agua Caliente Borrower 2 LLC, issued $130 million of senior secured notes under the Agua Caliente Borrower 1 LLC and Agua Caliente Borrower 2 LLC financing agreement, or Agua Caliente Holdco Financing Agreement, that bear interest at 5.43% and mature on December 31, 2038. As described in Note 3 , Business Acquisitions , on March 27, 2017, the Company acquired Agua Caliente Borrower 2 LLC from NRG as part of the March 2017 Drop Down Assets acquisition and assumed NRG's portion of senior secured notes under the Agua Caliente Holdco Financing Agreement. Agua Caliente Borrower 2 LLC holds $41 million of the Agua Caliente Holdco debt as of September 30, 2017 . The debt is joint and several with respect to Agua Caliente Borrower 1 LLC and Agua Caliente Borrower 2 LLC and is secured by the equity interests of each borrower in the Agua Caliente solar facility. Utah Solar Portfolio, due 2022 As part of the March 2017 Drop Down Assets acquisition, the Company assumed non-recourse debt of $287 million relating to the Utah Solar Portfolio at an interest rate of LIBOR plus 2.625% . The debt matures on December 16, 2022. The $287 million consisted of $222 million outstanding at the time of NRG's acquisition of the Utah Solar Portfolio on November 2, 2016, and additional borrowings of $65 million , net of debt issuance costs, incurred during 2016. The Company holds $284 million of the Utah Solar Portfolio debt as of September 30, 2017 .

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company’s segment structure reflects how management currently operates and allocates resources. The Company's businesses are primarily segregated based on conventional power generation, renewable businesses which consist of solar and wind, and the thermal and chilled water business. The Corporate segment reflects the Company's corporate costs. The Company's chief operating decision maker, its Chief Executive Officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, and CAFD, as well as economic gross margin and net income (loss). Three months ended September 30, 2017 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 88 $ 131 $ 46 $ — $ 265 Cost of operations 16 33 29 — 78 Depreciation and amortization 27 56 5 — 88 General and administrative — — — 4 4 Operating income (loss) 45 42 12 (4 ) 95 Equity in earnings of unconsolidated affiliates 3 25 — — 28 Other income, net 1 — — — 1 Interest expense (13 ) (39 ) (2 ) (18 ) (72 ) Net Income (Loss) $ 36 $ 28 $ 10 $ (22 ) $ 52 Total Assets $ 1,920 $ 5,821 $ 420 $ 79 $ 8,240 Three months ended September 30, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 82 $ 142 $ 48 $ — $ 272 Cost of operations 14 31 31 — 76 Depreciation and amortization 20 50 5 — 75 General and administrative — — — 3 3 Operating income (loss) 48 61 12 (3 ) 118 Equity in earnings of unconsolidated affiliates 3 13 — — 16 Other income, net 1 — — — 1 Interest expense (13 ) (37 ) (2 ) (16 ) (68 ) Net Income (Loss) $ 39 $ 37 $ 10 $ (19 ) $ 67 Nine months ended September 30, 2017 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 246 $ 391 $ 130 $ — $ 767 Cost of operations 53 100 86 — 239 Depreciation and amortization 77 149 15 — 241 General and administrative — — — 14 14 Acquisition-related transaction and integration costs — — — 2 2 Operating income (loss) 116 142 29 (16 ) 271 Equity in earnings of unconsolidated affiliates 9 54 — — 63 Other income, net 1 1 — 1 3 Interest expense (39 ) (128 ) (7 ) (53 ) (227 ) Net Income (Loss) $ 87 $ 69 $ 22 $ (68 ) $ 110 Total Assets $ 1,920 $ 5,821 $ 420 $ 79 $ 8,240 Nine months ended September 30, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 246 $ 412 $ 131 $ — $ 789 Cost of operations 53 98 87 — 238 Depreciation and amortization 60 149 15 — 224 General and administrative — — — 8 8 Operating income (loss) 133 165 29 (8 ) 319 Equity in earnings of unconsolidated affiliates 10 24 — — 34 Other income, net 1 2 — — 3 Interest expense (36 ) (115 ) (5 ) (48 ) (204 ) Net Income (Loss) $ 108 $ 76 $ 24 $ (56 ) $ 152

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2017
Related Party Transactions [Abstract]
Related Party Transactions Disclosure	Related Party Transactions In addition to the transactions and relationships described elsewhere in these notes to the consolidated financial statements, NRG and certain subsidiaries of NRG provide services to the Company and its project entities. Amounts due to NRG subsidiaries are recorded as accounts payable - affiliate and amounts due to the Company from NRG or its subsidiaries are recorded as accounts receivable - affiliate in the Company's balance sheet. Power Purchase Agreements (PPAs) between the Company and NRG Power Marketing Elbow Creek and Dover are parties to PPAs with NRG Power Marketing and generate revenue under the PPAs, which are recorded to operating revenues in the Company's consolidated statements of operations. For the three and nine months ended September 30, 2017 , Elbow Creek and Dover, collectively, generated revenue of $3 million and $10 million , respectively. For the three and nine months ended September 30, 2016 , Elbow Creek and Dover, collectively, generated revenue of $4 million and $10 million , respectively. Energy Marketing Services Agreement by and between Thermal entities and NRG Power Marketing NRG Energy Center Dover LLC, NRG Energy Center Minneapolis, NRG Energy Center Phoenix LLC, and NRG Energy Center Paxton LLC, or Thermal entities, are parties to Energy Marketing Services Agreements with NRG Power Marketing, a wholly-owned subsidiary of NRG. Under the agreements, NRG Power Marketing procures fuel and fuel transportation for the operation of Thermal entities. For the three and nine months ended September 30, 2017 , Thermal entities purchased $1 million and $7 million , respectively, of natural gas from NRG Power Marketing. For the three and nine months ended September 30, 2016 , Thermal entities purchased $1 million and $6 million , respectively, of natural gas from NRG Power Marketing. Operation and Maintenance (O&M) Services Agreements by and between Company's subsidiaries and NRG Certain of the Company's subsidiaries are party to O&M Services Agreements with NRG, pursuant to which NRG subsidiaries provide necessary and appropriate services to operate and maintain the subsidiaries' plant operations, businesses and thermal facilities. NRG is reimbursed for the provided services, as well as for all reasonable and related expenses and expenditures, and payments to third parties for services and materials rendered to or on behalf of the parties to the agreements. NRG is not entitled to any management fee or mark-up under the agreements. The following table summarizes material O&M costs recorded in the cost of operations line in the Company's consolidated statements of operations: Three months ended September 30, Nine months ended September 30, (in millions) 2017 2016 2017 2016 O&M costs $ 10 $ 9 $ 29 $ 28 There were balances of $21 million and $22 million due from the entities above to NRG in accounts payable — affiliate as of September 30, 2017 and December 31, 2016 , respectively. As of September 30, 2017 , $3 million was recorded in long term liabilities of the consolidated balance sheet. O&M Services Agreements by and between GenConn and NRG GenConn incurs fees under two O&M agreements with wholly-owned subsidiaries of NRG. For the three months and nine months ended September 30, 2017 and September 30, 2016 , the aggregate fees incurred under the agreements were $1 million and $4 million for each period in each year, respectively. Administrative Services Agreement by and between Marsh Landing and NRG West Coast LLC On December 19, 2016, Marsh Landing entered into an administrative services agreement with NRG West Coast LLC, a wholly owned subsidiary of NRG. The administrative services agreement was previously between Marsh Landing and GenOn Energy Services, LLC, a wholly-owned subsidiary of NRG and was subsequently assigned to and assumed by NRG West Coast LLC. The Company reimbursed costs under this agreement of $4 million and $10 million for the three and nine months ended September 30, 2017 , respectively. The Company reimbursed costs under the agreement of $4 million and $9 million for the three and nine months ended September 30, 2016 , respectively. Administrative Services Agreements by and between the Company and NRG Renew Operation & Maintenance LLC Various wholly-owned subsidiaries of the Company in the Renewables segment are party to administrative services agreements with NRG Renew Operation and Maintenance LLC, or RENOM, a wholly-owned subsidiary of NRG, which provides O&M services on behalf of these entities. The Company incurred total expenses for these services in the amount of $6 million and $16 million for the three and nine months ended September 30, 2017 , respectively. The Company incurred total expenses for these services of $4 million and $9 million for the three and nine months ended September 30, 2016 , respectively. There was a balance of $4 million and $5 million due to RENOM as of September 30, 2017 and December 31, 2016 , respectively. Management Services Agreement by and between the Company and NRG NRG provides the Company with various operation, management, and administrative services, which include human resources, accounting, tax, legal, information systems, treasury, and risk management, as set forth in the Management Services Agreement. As of September 30, 2017 , the base management fee was approximately $8 million per year, subject to an inflation-based adjustment annually at an inflation factor based on the year-over-year U.S. consumer price index. The fee is also subject to adjustments following the consummation of acquisitions and as a result of a change in the scope of services provided under the Management Services Agreement. Costs incurred under this agreement were $2 million and $8 million for the three and nine months ended September 30, 2017 , respectively. Costs incurred under this agreement for the three and nine months ended September 30, 2016 were $1 million and $6 million , respectively. The costs incurred under the Management Service Agreement included certain direct expenses incurred by NRG on behalf of the Company in addition to the base management fee.

Condensed Consolidating Financi

Condensed Consolidating Financial Information Condensed Consolidating Financial Information	9 Months Ended
	Sep. 30, 2017
Condensed Consolidating Financial Information Disclosure [Abstract]
Condensed Financial Statements [Text Block]	Condensed Consolidating Financial Information As of September 30, 2017 , Yield Operating LLC had outstanding $500 million of the 2024 Senior Notes and $350 million of the 2026 Senior Notes, collectively Senior Notes, as described in Note 10 , Long-term Debt to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. These Senior Notes are guaranteed by NRG Yield LLC, as well as certain of the Company's subsidiaries, or guarantor subsidiaries. These guarantees are both joint and several. The non-guarantor subsidiaries include the rest of the Company's subsidiaries, including those that are subject to project financing. Unless otherwise noted below, each of the following guarantor subsidiaries fully and unconditionally guaranteed the Senior Notes as of September 30, 2017 : NRG Yield LLC Alta Wind 1-5 Holding Company, LLC Alta Wind Company, LLC NRG Energy Center Omaha Holdings LLC NRG Energy Center Omaha LLC NYLD Fuel Cell Holdings LLC UB Fuel Cell, LLC NRG South Trent Holdings LLC NRG Yield DGPV Holding LLC NRG Yield RPV Holding LLC Yield Operating LLC conducts its business through and derives its income from its subsidiaries. Therefore, its ability to make required payments with respect to its indebtedness and other obligations depends on the financial results and condition of its subsidiaries and Yield Operating LLC's ability to receive funds from its subsidiaries. There are no restrictions on the ability of any of the guarantor subsidiaries to transfer funds to Yield Operating LLC. However, there may be restrictions for certain non-guarantor subsidiaries. The following condensed consolidating financial information presents the financial information of NRG Yield LLC, Yield Operating LLC, the issuer of the Senior Notes, the guarantor subsidiaries and the non-guarantor subsidiaries in accordance with Rule 3-10 under the SEC Regulation S-X. The financial information may not necessarily be indicative of results of operations or financial position had the guarantor subsidiaries or non-guarantor subsidiaries operated as independent entities. In this presentation, NRG Yield LLC consists of parent company operations. Guarantor subsidiaries and non-guarantor subsidiaries of NRG Yield LLC are reported on an equity basis. For companies acquired, the fair values of the assets and liabilities acquired have been presented on a push-down accounting basis. As described in Note 1 , Nature of Business , the Company completed the acquisition of the August 2017 Drop Down Assets, March 2017 Drop Down Assets and CVSR Drop Down Asset from NRG on August 1, 2017, March 27, 2017 and September 1, 2016, respectively. The guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect since the inception of common control. Accordingly, the Company prepared its condensed consolidating financial statements to reflect the transfers as if they had taken place from the beginning of the financial statements period. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Three Months Ended September 30, 2017 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Operating Revenues Total operating revenues $ — $ 6 $ 259 $ — $ — $ 265 Operating Costs and Expenses Cost of operations — 3 75 — — 78 Depreciation and amortization — 1 87 — — 88 General and administrative — — — 4 — 4 Total operating costs and expenses — 4 162 4 — 170 Operating Income (Loss) — 2 97 (4 ) — 95 Other Income (Expense) Equity in earnings (losses) of consolidated affiliates 75 (4 ) — 59 (130 ) — Equity in earnings of unconsolidated affiliates — 7 6 15 — 28 Other income, net — — 1 — — 1 Interest expense — — (54 ) (18 ) — (72 ) Total other income (expense), net 75 3 (47 ) 56 (130 ) (43 ) Net Income 75 5 50 52 (130 ) 52 Less: Net loss attributable to noncontrolling interests — — (1 ) (23 ) 1 (23 ) Net Income Attributable to NRG Yield LLC $ 75 $ 5 $ 51 $ 75 $ (131 ) $ 75 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Nine Months ended September 30, 2017 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Operating Revenues Total operating revenues $ — $ 16 $ 751 $ 1 $ (1 ) $ 767 Operating Costs and Expenses Cost of operations — 10 229 1 (1 ) 239 Depreciation and amortization — 3 238 — — 241 General and administrative — — — 14 — 14 Acquisition-related transaction and integration costs — — — 2 — 2 Total operating costs and expenses — 13 467 17 (1 ) 496 Operating Income (Loss) — 3 284 (16 ) — 271 Other Income (Expense) Equity in earnings of consolidated affiliates 165 6 — 153 (324 ) — Equity in earnings of unconsolidated affiliates — 9 28 26 — 63 Other income, net 1 — 2 — — 3 Interest expense — — (173 ) (54 ) — (227 ) Total other income (expense), net 166 15 (143 ) 125 (324 ) (161 ) Net Income 166 18 141 109 (324 ) 110 Less: Net loss attributable to noncontrolling interests — — (3 ) (56 ) 3 (56 ) Net Income Attributable to NRG Yield LLC $ 166 $ 18 $ 144 $ 165 $ (327 ) $ 166 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the Three Months Ended September 30, 2017 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income $ 75 $ 5 $ 50 $ 52 $ (130 ) $ 52 Other Comprehensive Income Unrealized gain on derivatives 7 — 7 7 (14 ) 7 Other comprehensive income 7 — 7 7 (14 ) 7 Comprehensive Income 82 5 57 59 (144 ) 59 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (23 ) 1 (23 ) Comprehensive Income Attributable to NRG Yield LLC $ 82 $ 5 $ 58 $ 82 $ (145 ) $ 82 (a) All significant intercompany transactions have been eliminated in consolidation. For the Nine Months ended September 30, 2017 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income $ 166 $ 18 $ 141 $ 109 $ (324 ) $ 110 Other Comprehensive Income Unrealized loss on derivatives 7 — 7 7 (14 ) 7 Other comprehensive loss 7 — 7 7 (14 ) 7 Comprehensive Income 173 18 148 116 (338 ) 117 Less: Comprehensive loss attributable to noncontrolling interests — — (3 ) (56 ) 3 (56 ) Comprehensive Income Attributable to NRG Yield LLC $ 173 $ 18 $ 151 $ 172 $ (341 ) $ 173 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS September 30, 2017 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC Eliminations (a) Consolidated ASSETS (In millions) Current Assets Cash and cash equivalents $ 76 $ — $ 102 $ — $ — $ 178 Restricted cash — — 140 — — 140 Accounts receivable — trade — 3 123 — — 126 Accounts receivable — affiliate 1 — — — — 1 Inventory — 1 37 — — 38 Notes receivable — — 15 — — 15 Prepayments and other current assets — — 22 — — 22 Total current assets 77 4 439 — — 520 Net property, plant and equipment — 59 5,188 — — 5,247 Other Assets Investment in consolidated subsidiaries 1,828 482 — 3,134 (5,444 ) — Equity investments in affiliates — 210 598 375 — 1,183 Intangible assets, net — 55 1,179 — — 1,234 Other non-current assets — — 56 — — 56 Total other assets 1,828 747 1,833 3,509 (5,444 ) 2,473 Total Assets $ 1,905 $ 810 $ 7,460 $ 3,509 $ (5,444 ) $ 8,240 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS September 30, 2017 (Continued) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC Eliminations (a) Consolidated LIABILITIES AND MEMBERS' EQUITY (In millions) Current Liabilities Current portion of long-term debt — external $ — $ — $ 300 $ — $ — $ 300 Accounts payable — 2 25 — — 27 Accounts payable — affiliate — 5 19 21 — 45 Derivative instruments — — 23 — — 23 Accrued expenses and other current liabilities — 1 80 13 — 94 Total current liabilities — 8 447 34 — 489 Other Liabilities Long-term debt — external — — 4,074 840 — 4,914 Long-term debt — affiliate — — — 618 — 618 Accounts payable — affiliate — — 3 — — 3 Derivative instruments — — 43 — — 43 Other non-current liabilities — — 79 8 — 87 Total non-current liabilities — — 4,199 1,466 — 5,665 Total Liabilities — 8 4,646 1,500 — 6,154 Commitments and Contingencies Members' Equity Contributed capital 1,897 853 2,734 2,077 (5,664 ) 1,897 Retained earnings (accumulated deficit) 86 (49 ) 100 (171 ) 120 86 Accumulated other comprehensive loss (78 ) (2 ) (80 ) (78 ) 160 (78 ) Noncontrolling interest — — 60 181 (60 ) 181 Total Members' Equity 1,905 802 2,814 2,009 (5,444 ) 2,086 Total Liabilities and Members’ Equity $ 1,905 $ 810 $ 7,460 $ 3,509 $ (5,444 ) $ 8,240 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Nine Months ended September 30, 2017 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Consolidated (In millions) Net Cash Provided by (Used in) Operating Activities $ — $ 38 $ 414 $ (77 ) $ 375 Cash Flows from Investing Activities Intercompany transactions between Yield LLC and subsidiaries (13 ) — — 13 — Payments for the Drop Down Assets — — — (176 ) (176 ) Capital expenditures — (3 ) (20 ) — (23 ) Cash receipts from notes receivable — — 11 — 11 Return of investment from unconsolidated affiliates — 7 9 16 32 Net investments in unconsolidated affiliates — (41 ) (7 ) — (48 ) Net Cash Used in Investing Activities (13 ) (37 ) (7 ) (147 ) (204 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement (6 ) (1 ) — 7 — Net contributions from noncontrolling interests — — — 13 13 Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets — — (42 ) (7 ) (49 ) (Payments of) proceeds from distributions (149 ) — (211 ) 211 (149 ) Payment of debt issuance costs — — (4 ) — (4 ) Proceeds from Issuance of Class C units 33 — — — 33 Proceeds from the issuance of long-term debt — external — — 41 — 41 Payments for long-term debt — — (224 ) — (224 ) Net Cash (Used in) Provided by Financing Activities (122 ) (1 ) (440 ) 224 (339 ) Net Decrease in Cash, Cash Equivalents and Restricted Cash (135 ) — (33 ) — (168 ) Cash, Cash Equivalents and Restricted Cash at Beginning of Period 211 — 275 — 486 Cash, Cash Equivalents and Restricted Cash at End of Period $ 76 $ — $ 242 $ — $ 318 NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the Three Months Ended September 30, 2016 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (b) Consolidated (a) (In millions) Operating Revenues Total operating revenues $ — $ 7 $ 265 $ — $ — $ 272 Operating Costs and Expenses Cost of operations — 3 73 — — 76 Depreciation and amortization — 2 73 — — 75 General and administrative — — — 3 — 3 Total operating costs and expenses — 5 146 3 — 154 Operating Income (Loss) — 2 119 (3 ) — 118 Other Income (Expense) Equity in earnings of consolidated affiliates 105 4 — 73 (182 ) — Equity in earnings of unconsolidated affiliates — (1 ) 3 14 — 16 Other income, net — — 1 — — 1 Interest expense — — (51 ) (17 ) — (68 ) Total other income (expense), net 105 3 (47 ) 70 (182 ) (51 ) Net Income 105 5 72 67 (182 ) 67 Less: Net loss attributable to noncontrolling interests — — (1 ) (38 ) 1 (38 ) Net Income Attributable to NRG Yield LLC $ 105 $ 5 $ 73 $ 105 $ (183 ) $ 105 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Nine Months Ended September 30, 2016 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (b) Consolidated (a) (In millions) Operating Revenues Total operating revenues $ — $ 17 $ 772 $ — $ — $ 789 Operating Costs and Expenses Cost of operations — 10 228 — — 238 Depreciation and amortization — 4 220 — — 224 General and administrative — — — 8 — 8 Total operating costs and expenses — 14 448 8 — 470 Operating Income (Loss) — 3 324 (8 ) — 319 Other Income (Expense) Equity in income of consolidated affiliates 219 21 — 184 (424 ) — Equity in earnings of unconsolidated affiliates — 7 3 24 — 34 Other income, net — — 3 — — 3 Interest expense — — (156 ) (48 ) — (204 ) Total other income (expense), net 219 28 (150 ) 160 (424 ) (167 ) Net Income 219 31 174 152 (424 ) 152 Less: Net loss attributable to noncontrolling interests — — (1 ) (67 ) 1 (67 ) Net Income Attributable to NRG Yield LLC $ 219 $ 31 $ 175 $ 219 $ (425 ) $ 219 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2016 NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (a) Eliminations (b) Consolidated (a) ASSETS (In millions) Current Assets Cash and cash equivalents $ 211 $ — $ 110 $ — $ — $ 321 Restricted cash — — 165 — — 165 Accounts receivable — trade — 2 90 — — 92 Accounts receivable — affiliate — — 1 — — 1 Inventory — 2 37 — — 39 Derivative instruments — — 2 — — 2 Notes receivable — — 16 — — 16 Prepayments and other current assets — — 19 1 — 20 Total current assets 211 4 440 1 — 656 Net property, plant and equipment — 59 5,401 — — 5,460 Other Assets Investment in consolidated subsidiaries 1,867 527 — 3,212 (5,606 ) — Equity investments in affiliates — 171 600 381 — 1,152 Intangible assets, net — 56 1,230 — — 1,286 Derivative instruments — — 1 — — 1 Other non-current assets — — 64 1 — 65 Total other assets 1,867 754 1,895 3,594 (5,606 ) 2,504 Total Assets $ 2,078 $ 817 $ 7,736 $ 3,595 $ (5,606 ) $ 8,620 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2016 (Continued) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (a) Eliminations (b) Consolidated (a) LIABILITIES AND MEMBERS' EQUITY (In millions) Current Liabilities Current portion of long-term debt — external $ — $ — $ 291 $ — $ — $ 291 Accounts payable — 2 18 3 — 23 Accounts payable — affiliate — 7 15 18 — 40 Derivative instruments — — 32 — — 32 Accrued expenses and other current liabilities — 1 60 24 — 85 Total current liabilities — 10 416 45 — 471 Other Liabilities Long-term debt — external — — 4,259 839 — 5,098 Long-term debt — affiliate — — — 618 — 618 Accounts payable — affiliate — — 9 — — 9 Derivative instruments — — 44 — — 44 Other non-current liabilities — — 76 — — 76 Total non-current liabilities — — 4,388 1,457 — 5,845 Total Liabilities — 10 4,804 1,502 — 6,316 Commitments and Contingencies Members' Equity Contributed capital 2,127 874 2,920 2,103 (5,897 ) 2,127 Retained earnings (Accumulated deficit) 36 (65 ) 35 (151 ) 181 36 Accumulated other comprehensive loss (85 ) (2 ) (87 ) (85 ) 174 (85 ) Noncontrolling Interest — — 64 226 (64 ) 226 Total Members' Equity 2,078 807 2,932 2,093 (5,606 ) 2,304 Total Liabilities and Members’ Equity $ 2,078 $ 817 $ 7,736 $ 3,595 $ (5,606 ) $ 8,620 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Nine Months Ended September 30, 2016 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) Consolidated (a) (In millions) Net Cash Provided by Operating Activities $ — $ 45 $ 365 $ 34 $ 444 Cash Flows from Investing Activities Intercompany transactions from Yield LLC to subsidiaries 145 — — (145 ) — Acquisition of Drop Down Assets, net of cash acquired — — — (77 ) (77 ) Capital expenditures — — (16 ) — (16 ) Cash receipts from notes receivable — — 11 — 11 Return of investment from unconsolidated affiliates — 3 — 13 16 Net investments in unconsolidated affiliates — (48 ) — (21 ) (69 ) Net Cash Provided by (Used in) Investing Activities 145 (45 ) (5 ) (230 ) (135 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement 54 — — (54 ) — Net contributions from noncontrolling interests — — — 7 7 Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets — — (126 ) — (126 ) (Payments of) proceeds from distributions (127 ) — (204 ) 204 (127 ) Payment of debt issuance costs — — (1 ) (5 ) (6 ) Proceeds from the revolving credit facility — — — 60 60 Payments for the revolving credit facility — — — (366 ) (366 ) Proceeds from the issuance of long-term debt - external — — 200 350 550 Payments for long-term debt — — (204 ) — (204 ) Net Cash (Used in) Provided by Financing Activities (73 ) — (335 ) 196 (212 ) Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash 72 — 25 — 97 Cash, Cash Equivalents and Restricted Cash at Beginning of Period 15 — 226 — 241 Cash, Cash Equivalents and Restricted Cash at End of Period $ 87 $ — $ 251 $ — $ 338 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business .

Commitments and Contingencies (

Commitments and Contingencies (Notes)	9 Months Ended
	Sep. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Contingencies This note should be read in conjunction with the complete description under Note 14 , Commitments and Contingencies , to the Company's 2016 Form 10-K. The Company's material legal proceedings are described below. The Company believes that it has valid defenses to these legal proceedings and intends to defend them vigorously. The Company records reserves for estimated losses from contingencies when information available indicates that a loss is probable and the amount of the loss, or range of loss, can be reasonably estimated. As applicable, the Company has established an adequate reserve for the matters discussed below. In addition, legal costs are expensed as incurred. Management assesses such matters based on current information and makes a judgment concerning its potential outcome, considering the nature of the claim, the amount and nature of damages sought, and the probability of success. The Company is unable to predict the outcome of the legal proceedings below or reasonably estimate the scope or amount of any associated costs and potential liabilities. As additional information becomes available, management adjusts its assessment and estimates of such contingencies accordingly. Because litigation is subject to inherent uncertainties and unfavorable rulings or developments, it is possible that the ultimate resolution of the Company's liabilities and contingencies could be at amounts that are different from its currently recorded reserves and that such difference could be material. In addition to the legal proceedings noted below, the Company and its subsidiaries are party to other litigation or legal proceedings arising in the ordinary course of business. In management's opinion, the disposition of these ordinary course matters will not materially adversely affect the Company's consolidated financial position, results of operations, or cash flows. Braun v. NRG Yield, Inc. — On April 19, 2016, plaintiffs filed a putative class action lawsuit against NRG Yield, Inc., the current and former members of its board of directors individually, and other parties in California Superior Court in Kern County, CA. Plaintiffs allege various violations of the Securities Act due to the defendants’ alleged failure to disclose material facts related to low wind production prior to NRG Yield, Inc.'s June 22, 2015 Class C common stock offering. Plaintiffs seek compensatory damages, rescission, attorney’s fees and costs. The defendants filed demurrers and a motion challenging jurisdiction on October 18, 2016. On October 26, 2017, the court approved the parties' stipulation which provides the plaintiffs' opposition is due on December 6, 2017 and the defendants' reply is due on February 8, 2018. Ahmed v. NRG Energy, Inc. and the NRG Yield Board of Directors — On September 15, 2016, plaintiffs filed a putative class action lawsuit against NRG Energy, Inc., the directors of NRG Yield, Inc., and other parties in the Delaware Chancery Court. The complaint alleges that the defendants breached their respective fiduciary duties with regard to the recapitalization of NRG Yield, Inc. common stock in 2015. The plaintiffs generally seek economic damages, attorney’s fees and injunctive relief. The defendants filed a motion to dismiss the lawsuit on December 21, 2016. Plaintiffs filed their objection to the motion to dismiss on February 15, 2017. The defendants' reply was filed on March 24, 2017. The court heard oral argument on the defendants' motion to dismiss on June 20, 2017. On September 7, 2017, the court requested additional briefing which the parties provided on September 21, 2017. GenOn Noteholders' Lawsuit — On December 13, 2016, certain indenture trustees for an ad hoc group of holders, or the Noteholders, of the GenOn Energy, Inc., or GenOn, 7.875% Senior Notes due 2017, 9.500% Notes due 2018, and 9.875% Notes due 2020, and the GenOn Americas Generation, LLC 8.50% Senior Notes due 2021 and 9.125% Senior Notes due 2031, along with certain of the Noteholders, filed a complaint in the Superior Court of the State of Delaware against NRG and GenOn alleging certain claims related to the Services Agreement between NRG and GenOn. On April 30, 2017, the Noteholders filed an amended complaint that asserts additional claims of fraudulent transfer, insider preference and breach of fiduciary duties. In addition to NRG and GenOn, the amended complaint names NRG Yield LLC and certain current and former officers and directors of GenOn as defendants. The plaintiffs, among other things, generally seek return of all monies paid under the Services Agreement and any other damages that the court deems appropriate. On April 28, 2017, the bondholders filed an amended complaint adding the GenOn directors and officers as defendants and asserting claims that they breached certain fiduciary duties. Plaintiffs specifically allege that the transfer of Marsh Landing to NRG Yield LLC constituted a fraudulent transfer. On June 12, 2017, certain GenOn entities, NRG and certain holders of the GenOn and GenOn Americas Generation, LLC senior notes entered into a restructuring support and lock-up agreement. Pursuant to the terms of the restructuring support and lock-up agreement, this matter should ultimately be resolved if GenOn's plan of reorganization, originally submitted on June 29, 2017, is approved by the United States Bankruptcy Court for the Southern District of Texas, Houston Division.

Summary of Significant Accoun17

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Distributions [Policy Text Block]	Distributions The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the nine months ended September 30, 2017 : Third Quarter 2017 Second Quarter 2017 First Quarter 2017 Distributions per Class A, B, C and D unit $ 0.28 $ 0.27 $ 0.26 On October 31, 2017 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.288 per unit payable on December 15, 2017 to unit holders of record as of December 1, 2017 . Changes in Capital Structure At-the-Market Equity Offering Program, or the ATM Program NRG Yield, Inc. is party to an equity distribution agreement with Barclays Capital Inc., Credit Suisse Securities (USA) LLC, J.P. Morgan Securities LLC and RBC Capital Markets, LLC, as sales agents. Pursuant to the terms of the equity distribution agreement, NRG Yield, Inc. may offer and sell shares of its Class C common stock par value $0.01 per share, from time to time through the sales agents up to an aggregate sales price of $150 million through an at-the-market equity offering program, or the ATM Program. NRG Yield, Inc. may also sell shares of its Class C common stock to any of the sales agents, as principals for its own account, at a price agreed upon at the time of sale. During the first nine months of 2017, Yield, Inc. issued 1,921,866 shares of Class C common stock under the ATM Program for gross proceeds of $35 million , with commission fees of $ 346 thousand . Yield, Inc. used the net proceeds to acquire 1,921,866 Class C units from the Company. At September 30, 2017 , approximately $115 million remains available for issuance under the ATM Program. Reclassifications Certain prior-year amounts have been reclassified for comparative purposes.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could be different from these estimates.
Recent Accounting Developments	Recent Accounting Developments ASU 2017-12 — In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815) , Targeted Improvements to Accounting for Hedging Activities, or ASU No. 2017-12. ASU No. 2017-12 amends ASU No. 2016-15. The amendments of ASU No. 2016-15 were issued to simplify the application of hedge accounting guidance and more closely aligning financial reporting for hedging relationships with economic results of an entity's risk management activities. The issues addressed by ASU No. 2017-12 include but are not limited to alignment of risk management activities and financial reporting, risk component hedging, accounting for the hedged item in fair value hedges of interest rate risk, recognition and presentation of the effects of hedging instruments, amounts excluded from the assessment of hedge effectiveness, and other simplifications of hedge accounting guidance. The amendments of ASU No. 2017-12 are effective for fiscal years beginning after December 15, 2018, and interim periods therein. Early adoption is permitted in any interim period and the effect of the adoption should be reflected as of the beginning of the fiscal year of adoption. The Company does not expect that the adoption of ASU No. 2017-12 will have a material impact on our consolidated results of operations, cash flows, and statement of financial position. ASU 2016-18 — In November 2016, the FASB issued ASU No. 2016-18, Statement of Cash Flows (Topic 230) , Restricted Cash, or ASU No. 2016-18. The amendments of ASU No. 2016-18 require an entity to include amounts generally described as restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling the beginning of period and end of period total amounts on the statement of cash flows. The amendments of ASU No. 2016-18 are effective for annual reporting periods beginning after December 15, 2017, and interim periods within those annual periods. Early adoption is permitted and the adoption of ASU No. 2016-18 will be applied retrospectively. The Company early adopted ASU No. 2016-18 during the second quarter of 2017. Net cash flows used in investing activities for the nine months ended September 30, 2016 decreased by $7 million. The sum of Company's cash and cash equivalents and restricted cash reported within the consolidated balance sheet as of December 31, 2016 equals the beginning balances of cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows for the nine months ended September 30, 2017. The sum of Company's cash and cash equivalents and restricted cash reported within the consolidated balance sheet as of September 30, 2017 equals to the ending balances of cash, cash equivalents and restricted cash shown in the consolidated statement of cash flows for the nine months ended September 30, 2017. ASU 2016-02 — In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), or Topic 842, with the objective to increase transparency and comparability among organizations by recognizing lease assets and lease liabilities on the balance sheet and to improve financial reporting by expanding the related disclosures. The guidance in Topic 842 provides that a lessee that may have previously accounted for a lease as an operating lease under current GAAP should recognize the assets and liabilities that arise from a lease on the balance sheet. In addition, Topic 842 expands the required quantitative and qualitative disclosures with regards to lease arrangements. The Company expects to adopt the standard effective January 1, 2019 utilizing the required modified retrospective approach for the earliest period presented. The Company expects to elect certain of the practical expedients permitted, including the expedient that permits the Company to retain its existing lease assessment and classification. The Company is currently working through an adoption plan and evaluating the anticipated impact on the Company's results of operations, cash flows and financial position. While the Company is currently evaluating the impact the new guidance will have on its financial position and results of operations, the Company expects to recognize lease liabilities and right of use assets. The extent of the increase to assets and liabilities associated with these amounts remains to be determined pending the Company’s review of its existing lease contracts and service contracts which may contain embedded leases. While this review is still in process, the Company believes the adoption of Topic 842 may be material to its financial statements. ASU 2014-09 — In May 2014, the FASB issued ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606), or ASU No. 2014-09, which was further amended through various updates issued by the FASB thereafter. The amendments of ASU No. 2014-09 completed the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. The guidance under Topic 606 provides that an entity should recognize revenue to depict the transfer of goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled to in exchange for the goods or services provided and establishes a five step model to be applied by an entity in evaluating its contracts with customers. The Company expects to adopt the standard effective January 1, 2018 and apply the guidance retrospectively to contracts at the date of adoption. The Company will recognize the cumulative effect of applying Topic 606 at the date of initial application, as prescribed under the modified retrospective transition method. The Company also expects to elect the practical expedient available under Topic 606 for measuring progress toward complete satisfaction of a performance obligation and for disclosure requirements of remaining performance obligations. The practical expedient allows an entity to recognize revenue in the amount to which the entity has the right to invoice such that the entity has a right to the consideration in an amount that corresponds directly with the value to the customer for performance completed to date by the entity. The majority of the Company's revenues are obtained through PPAs, which are currently accounted for as operating leases. In connection with the implementation of Topic 842, as described above, the Company expects to elect certain of the practical expedients permitted, including the expedient that permits the Company to retain its existing lease assessment and classification. As leases are excluded from the scope of Topic 606, the Company expects the standard to have an immaterial impact on the Company's results of operations, cash flows and financial position.
Noncontrolling Interest Disclosure [Text Block]	Noncontrolling Interests The following table reflects the changes in the Company's noncontrolling interest balance: (In millions) Balance as of December 31, 2016 as reported $ 313 Less: Adjustment for August 2017 Drop Down Assets (87 ) Balance as of December 31, 2016 as recast 226 Capital contributions from tax equity investors, net of distributions 11 Comprehensive loss (56 ) Balance as of September 30, 2017 $ 181

Segment Reporting Segment Repor

Segment Reporting Segment Reporting (Policies)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Segment Reporting, Policy [Policy Text Block]	The Company’s segment structure reflects how management currently operates and allocates resources. The Company's businesses are primarily segregated based on conventional power generation, renewable businesses which consist of solar and wind, and the thermal and chilled water business. The Corporate segment reflects the Company's corporate costs. The Company's chief operating decision maker, its Chief Executive Officer, evaluates the performance of its segments based on operational measures including adjusted earnings before interest, taxes, depreciation and amortization, or Adjusted EBITDA, and CAFD, as well as economic gross margin and net income (loss).

Nature of Business Nature of Bu

Nature of Business Nature of Business (Tables)	9 Months Ended
	Sep. 30, 2017
Nature of Business Disclosure [Abstract]
IPO of NRG Yield [Table Text Block]	The following table represents the structure of the Company as of September 30, 2017 :
Schedule of Ownership [Table Text Block]	As of September 30, 2017 , the Company's operating assets are comprised of the following projects: Projects Percentage Ownership Net Capacity (MW) (a) Offtake Counterparty Expiration Conventional El Segundo 100 % 550 Southern California Edison 2023 GenConn Devon 50 % 95 Connecticut Light & Power 2040 GenConn Middletown 50 % 95 Connecticut Light & Power 2041 Marsh Landing 100 % 720 Pacific Gas and Electric 2023 Walnut Creek 100 % 485 Southern California Edison 2023 1,945 Utility Scale Solar Agua Caliente 16 % 46 Pacific Gas and Electric 2039 Alpine 100 % 66 Pacific Gas and Electric 2033 Avenal 50 % 23 Pacific Gas and Electric 2031 Avra Valley 100 % 26 Tucson Electric Power 2032 Blythe 100 % 21 Southern California Edison 2029 Borrego 100 % 26 San Diego Gas and Electric 2038 CVSR 100 % 250 Pacific Gas and Electric 2038 Desert Sunlight 250 25 % 63 Southern California Edison 2035 Desert Sunlight 300 25 % 75 Pacific Gas and Electric 2040 Kansas South 100 % 20 Pacific Gas and Electric 2033 Roadrunner 100 % 20 El Paso Electric 2031 TA High Desert 100 % 20 Southern California Edison 2033 Utah Solar Portfolio (b) (e) 50 % 265 PacifiCorp 2036 921 Distributed Solar Apple I LLC Projects 100 % 9 Various 2032 AZ DG Solar Projects 100 % 5 Various 2025 - 2033 14 Wind Alta I 100 % 150 Southern California Edison 2035 Alta II 100 % 150 Southern California Edison 2035 Alta III 100 % 150 Southern California Edison 2035 Alta IV 100 % 102 Southern California Edison 2035 Alta V 100 % 168 Southern California Edison 2035 Alta X (b) 100 % 137 Southern California Edison 2038 Alta XI (b) 100 % 90 Southern California Edison 2038 Buffalo Bear 100 % 19 Western Farmers Electric Co-operative 2033 Crosswinds (b) (f) 99 % 21 Corn Belt Power Cooperative 2027 Elbow Creek (b) (f) 100 % 122 NRG Power Marketing LLC 2022 Elkhorn Ridge (b) (f) 66.7 % 54 Nebraska Public Power District 2029 Forward (b) (f) 100 % 29 Constellation NewEnergy, Inc. 2017 Goat Wind (b) (f) 100 % 150 Dow Pipeline Company 2025 Hardin (b) (f) 99 % 15 Interstate Power and Light Company 2027 Laredo Ridge 100 % 80 Nebraska Public Power District 2031 Lookout (b) (f) 100 % 38 Southern Maryland Electric Cooperative 2030 Projects Percentage Ownership Net Capacity (MW) (a) Offtake Counterparty Expiration Odin (b) (f) 99.9 % 20 Missouri River Energy Services 2028 Pinnacle 100 % 55 Maryland Department of General Services and University System of Maryland 2031 San Juan Mesa (b) (f) 75 % 90 Southwestern Public Service Company 2025 Sleeping Bear (b) (f) 100 % 95 Public Service Company of Oklahoma 2032 South Trent 100 % 101 AEP Energy Partners 2029 Spanish Fork (b) (f) 100 % 19 PacifiCorp 2028 Spring Canyon II (b) 90.1 % 29 Platte River Power Authority 2039 Spring Canyon III (b) 90.1 % 25 Platte River Power Authority 2039 Taloga 100 % 130 Oklahoma Gas & Electric 2031 Wildorado (b) (f) 100 % 161 Southwestern Public Service Company 2027 2,200 Thermal NRG Dover Energy Center LLC 100 % 103 NRG Power Marketing LLC 2018 Thermal generation 100 % 20 Various Various 123 Total net generation capacity (c) 5,203 Thermal equivalent MWt (d) 100 % 1,319 Various Various (a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2017 . (b) Projects are part of tax equity arrangements . (c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,209 MWs. (d) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 134 MWt available under the right-to-use provisions contained in agreements between two of the Company's thermal facilities and certain of its customers. (e) Represents interests in Four Brothers Solar, LLC, Granite Mountain Holdings, LLC, and Iron Springs Holdings, LLC, all acquired as part of the March 2017 Drop Down Assets (ownership percentage is based upon cash to be distributed). (f) Projects are part of NRG Wind TE Holdco portfolio.

Summary of Significant Accoun20

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2017
Accounting Policies [Abstract]
Schedule of Accumulated Depreciation and Amortization [Table Text Block]	Accumulated Depreciation, Accumulated Amortization The following table presents the accumulated depreciation included in the property, plant and equipment, net, and accumulated amortization included in intangible assets, net, respectively, as of September 30, 2017 and December 31, 2016 : September 30, 2017 December 31, 2016 (In millions) Property, Plant and Equipment Accumulated Depreciation $ 1,189 $ 951 Intangible Assets Accumulated Amortization 216 163
Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block]	Distributions The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the nine months ended September 30, 2017 : Third Quarter 2017 Second Quarter 2017 First Quarter 2017 Distributions per Class A, B, C and D unit $ 0.28 $ 0.27 $ 0.26 On October 31, 2017 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.288 per unit payable on December 15, 2017 to unit holders of record as of December 1, 2017 . Changes in Capital Structure At-the-Market Equity Offering Program, or the ATM Program NRG Yield, Inc. is party to an equity distribution agreement with Barclays Capital Inc., Credit Suisse Securities (USA) LLC, J.P. Morgan Securities LLC and RBC Capital Markets, LLC, as sales agents. Pursuant to the terms of the equity distribution agreement, NRG Yield, Inc. may offer and sell shares of its Class C common stock par value $0.01 per share, from time to time through the sales agents up to an aggregate sales price of $150 million through an at-the-market equity offering program, or the ATM Program. NRG Yield, Inc. may also sell shares of its Class C common stock to any of the sales agents, as principals for its own account, at a price agreed upon at the time of sale. During the first nine months of 2017, Yield, Inc. issued 1,921,866 shares of Class C common stock under the ATM Program for gross proceeds of $35 million , with commission fees of $ 346 thousand . Yield, Inc. used the net proceeds to acquire 1,921,866 Class C units from the Company. At September 30, 2017 , approximately $115 million remains available for issuance under the ATM Program. Reclassifications Certain prior-year amounts have been reclassified for comparative purposes.
Schedule of Change in Noncontrolling Interest [Table Text Block]	The following table reflects the changes in the Company's noncontrolling interest balance: (In millions) Balance as of December 31, 2016 as reported $ 313 Less: Adjustment for August 2017 Drop Down Assets (87 ) Balance as of December 31, 2016 as recast 226 Capital contributions from tax equity investors, net of distributions 11 Comprehensive loss (56 ) Balance as of September 30, 2017 $ 181

Business Acquisitions Busines21

Business Acquisitions Business Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2017
Business Acquisition, Pro Forma Information [Table Text Block]	The following tables present a summary of the Company's historical information combining the financial information for the March 2017 Drop Down Assets and August 2017 Drop Down Assets transferred in connection with the acquisition: Three months ended September 30, 2016 Nine months ended September 30, 2016 As Previously Reported March 2017 Drop Down Assets August 2017 Drop Down Assets As Currently Reported As Previously Reported March 2017 Drop Down Assets August 2017 Drop Down Assets As Currently Reported (In millions) Total operating revenues $ 272 $ — $ — $ 272 $ 789 $ — $ — $ 789 Operating income 118 — — 118 319 — — 319 Net income 64 3 — 67 147 5 — 152 Net income attributable to Yield LLC 100 3 2 105 209 5 5 219
November 2017 Drop Down Assets [Member]
Business Acquisition, Pro Forma Information [Table Text Block]	As described above, the Company's acquisition of the November 2017 Drop Down Assets was accounted for as a transfer of entities under common control. The following unaudited supplemental pro forma information represents the consolidated results of operations as if the Company acquired the November 2017 Drop Down Assets on January 1, 2016, including the impact of acquisition accounting with respect to NRG's acquisition of the projects. For the three months ended For the nine months ended September 30, 2017 September 30, 2016 September 30, 2017 September 30, 2016 Total operating revenues $ 269 $ 275 $ 777 $ 798 Net income 30 69 90 155
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The following is a summary of assets and liabilities transferred in connection with the acquisition of the November 2017 Drop Down Assets as of September 30, 2017: (In millions) Assets: Current assets $ 11 Property, plant and equipment 84 Non-current assets 32 Total assets 127 Liabilities: Debt (Current and non-current) (a) 31 Other current and non-current liabilities 3 Total liabilities assumed 34 Net assets acquired $ 93
March 2017 Drop Down Assets [Member]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The following is a summary of assets and liabilities transferred in connection with the acquisition of the March 2017 Drop Down Assets as of March 27, 2017: (In millions) Assets: Cash $ 6 Equity investment in projects 456 Total assets acquired 462 Liabilities: Debt (Current and non-current) (a) 320 Other current and non-current liabilities 3 Total liabilities assumed 323 Net assets acquired $ 139 (a) Net of $8 million of debt issuance costs.

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2017
Schedule of Equity Method Investments [Line Items]
Equity Method Investments [Table Text Block]	The following tables present summarized financial information for the Utah Solar Portfolio: Three months ended September 30, Nine months ended September 30, (In millions) 2017 2016 2017 2016 Income Statement Data: Utah Solar Portfolio Operating revenues $ 23 $ — $ 60 $ — Operating income 9 — 17 — Net income 9 — 17 — September 30, 2017 December 31, 2016 Balance Sheet Data: (In millions) Utah Solar Portfolio Current assets $ 25 $ 20 Non-current assets 1,091 1,105 Current liabilities 9 14 Non-current liabilities 21 38
Entities that are not consolidated [Member]
Schedule of Equity Method Investments [Line Items]
Schedule of Variable Interest Entities [Table Text Block]	The Company's maximum exposure to loss as of September 30, 2017 is limited to its equity investment in the unconsolidated entities, as further summarized in the table below: (In millions) Maximum exposure to loss Four Brothers Solar, LLC $ 221 Granite Mountain Holdings, LLC 81 Iron Springs Holdings, LLC 56 GenConn Energy LLC 102 NRG DGPV Holdco 1 LLC 71 NRG RPV Holdco 1 LLC 65 NRG DGPV Holdco 2 LLC 54 NRG DGPV Holdco 3 LLC 20
Consolidated Entities [Member]
Schedule of Equity Method Investments [Line Items]
Schedule of Variable Interest Entities [Table Text Block]	Summarized financial information for the Company's consolidated VIEs consisted of the following as of September 30, 2017 : (In millions) NRG Wind TE Holdco Alta Wind TE Holdco Spring Canyon Other current and non-current assets $ 175 $ 17 $ 4 Property, plant and equipment 417 443 96 Intangible assets 2 265 — Total assets 594 725 100 Current and non-current liabilities 206 9 6 Total liabilities 206 9 6 Noncontrolling interest 22 96 63 Net assets less noncontrolling interests $ 366 $ 620 $ 31

Fair Value of Financial Instr23

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives : Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 (In millions) Accumulated OCL beginning balance $ (86 ) $ (168 ) $ (86 ) $ (99 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 5 6 13 13 Mark-to-market of cash flow hedge accounting contracts 2 14 (6 ) (62 ) Accumulated OCL ending balance (79 ) (148 ) (79 ) (148 ) Accumulated OCL attributable to noncontrolling interests (1 ) (2 ) (1 ) (2 ) Accumulated OCL attributable to NRG Yield LLC $ (78 ) $ (146 ) $ (78 ) $ (146 ) Losses expected to be realized from OCL during the next 12 months $ 17 $ 17
Estimated carrying values and fair values of the Company's recorded financial instruments	The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows: As of September 30, 2017 As of December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value (In millions) Assets: Notes receivable (a) $ 18 $ 18 $ 30 $ 30 Liabilities: Long-term debt — affiliate 618 626 618 608 Long-term debt — external, including current portion (b) $ 5,268 $ 5,301 $ 5,451 $ 5,435 (a) Includes the long-term portion of notes receivable, which is recorded in other noncurrent assets on the Company's consolidated balance sheets. (b) Excludes deferred financing costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets.
Fair Value, Option, Quantitative Disclosures [Table Text Block]	The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non-publicly traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of September 30, 2017 and December 31, 2016 : As of September 30, 2017 As of December 31, 2016 Level 2 Level 3 Level 2 Level 3 (In millions) Long-term debt, including current portion $ 884 $ 5,043 $ 833 $ 5,210
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The Company records its derivative assets and liabilities at fair value on its consolidated balance sheet. The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy: As of September 30, 2017 As of December 31, 2016 Fair Value (a) Fair Value (a) Fair Value (a) (In millions) Level 2 Level 1 Level 2 Derivative assets: Commodity contracts $ — $ 1 $ 1 Interest rate contracts — — 1 Total assets — 1 2 Derivative liabilities: Commodity contracts 2 — 1 Interest rate contracts 64 — 75 Total liabilities $ 66 $ — $ 76

Accounting for Derivative Ins24

Accounting for Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Net notional volume buy/(sell) of NRG Yield's open derivative transactions broken out by commodity	The following table summarizes the net notional volume buy of the Company's open derivative transactions broken out by commodity: Total Volume September 30, 2017 December 31, 2016 Commodity Units (In millions) Natural Gas MMBtu 2 3 Interest Dollars $ 1,983 $ 2,070
Fair value within the derivative instrument valuation on the balance sheets	The following table summarizes the fair value within the derivative instrument valuation on the balance sheet: Fair Value Derivative Assets Derivative Liabilities December 31, 2016 September 30, 2017 December 31, 2016 (In millions) Derivatives Designated as Cash Flow Hedges: Interest rate contracts current $ — $ 7 $ 26 Interest rate contracts long-term 1 13 39 Total Derivatives Designated as Cash Flow Hedges 1 20 65 Derivatives Not Designated as Cash Flow Hedges : Interest rate contracts current — 15 5 Interest rate contracts long-term — 29 5 Commodity contracts current 2 1 1 Commodity contracts long-term — 1 — Total Derivatives Not Designated as Cash Flow Hedges 2 46 11 Total Derivatives $ 3 $ 66 $ 76
Offsetting of derivatives by counterparty master agreement level and collateral received or paid	The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. As of September 30, 2017 , there were no offsetting amounts at the counterparty master agreement level nor outstanding collateral paid or received. As of December 31, 2016 , there was no outstanding collateral paid or received. The following tables summarize the offsetting of derivatives by the counterparty master agreement level as of December 31, 2016 : As of December 31, 2016 Gross Amounts of Recognized Assets/Liabilities Derivative Instruments Net Amount Commodity contracts: (In millions) Derivative assets $ 2 $ — $ 2 Derivative liabilities (1 ) — (1 ) Total commodity contracts 1 — 1 Interest rate contracts: Derivative assets 1 (1 ) — Derivative liabilities (75 ) 1 (74 ) Total interest rate contracts (74 ) — (74 ) Total derivative instruments $ (73 ) $ — $ (73 )
Effects of NRG Yield's accumulated OCI balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax	The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives : Three months ended September 30, Nine months ended September 30, 2017 2016 2017 2016 (In millions) Accumulated OCL beginning balance $ (86 ) $ (168 ) $ (86 ) $ (99 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 5 6 13 13 Mark-to-market of cash flow hedge accounting contracts 2 14 (6 ) (62 ) Accumulated OCL ending balance (79 ) (148 ) (79 ) (148 ) Accumulated OCL attributable to noncontrolling interests (1 ) (2 ) (1 ) (2 ) Accumulated OCL attributable to NRG Yield LLC $ (78 ) $ (146 ) $ (78 ) $ (146 ) Losses expected to be realized from OCL during the next 12 months $ 17 $ 17

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2017
Debt Disclosure [Abstract]
Schedule of long-term debt	This footnote should be read in conjunction with the complete description under Note 10 , Long-term Debt , to the consolidated financial statements for the year ended December 31, 2016 included in the Company's May 9, 2017 Form 8-K. Long-term debt consisted of the following: September 30, 2017 December 31, 2016 September 30, 2017, interest rate % (a) Letters of Credit Outstanding at September 30, 2017 (In millions, except rates) Long-term debt - affiliate, due 2019 $ 337 $ 337 3.580 Long-term debt - affiliate, due 2020 281 281 3.325 2024 Senior Notes 500 500 5.375 2026 Senior Notes 350 350 5.000 Project-level debt: Agua Caliente Borrower 2, due 2038 41 — 5.430 17 Alpine, due 2022 138 145 L+1.750 37 Alta Wind I - V lease financing arrangements, due 2034 and 2035 940 965 5.696 - 7.015 103 CVSR, due 2037 746 771 2.339 - 3.775 — CVSR Holdco Notes, due 2037 194 199 4.680 13 El Segundo Energy Center, due 2023 400 443 L+1.75 - L+2.375 102 Energy Center Minneapolis, due 2017 and 2025 82 96 5.950 -7.250 — Energy Center Minneapolis Series D Notes, due 2031 125 125 3.550 — Laredo Ridge, due 2028 96 100 L+1.875 10 Marsh Landing, due 2017 and 2023 334 370 L+1.750 - L+1.875 34 Tapestry, due 2021 165 172 L+1.625 20 Utah Solar Portfolio, due 2022 284 287 L+2.625 13 Viento, due 2023 169 178 L+3.00 27 Walnut Creek, due 2023 279 310 L+1.625 49 Other 425 440 Various 37 Subtotal project-level debt: 4,418 4,601 Total debt 5,886 6,069 Less current maturities (300 ) (291 ) Less net debt issuance costs (54 ) (62 ) Total long-term debt $ 5,532 $ 5,716 (a) As of September 30, 2017 , L+equals 3 month LIBOR plus x%, except for the Utah Solar Portfolio, where L+equals 1 month LIBOR plus x%

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three months ended September 30, 2017 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 88 $ 131 $ 46 $ — $ 265 Cost of operations 16 33 29 — 78 Depreciation and amortization 27 56 5 — 88 General and administrative — — — 4 4 Operating income (loss) 45 42 12 (4 ) 95 Equity in earnings of unconsolidated affiliates 3 25 — — 28 Other income, net 1 — — — 1 Interest expense (13 ) (39 ) (2 ) (18 ) (72 ) Net Income (Loss) $ 36 $ 28 $ 10 $ (22 ) $ 52 Total Assets $ 1,920 $ 5,821 $ 420 $ 79 $ 8,240 Three months ended September 30, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 82 $ 142 $ 48 $ — $ 272 Cost of operations 14 31 31 — 76 Depreciation and amortization 20 50 5 — 75 General and administrative — — — 3 3 Operating income (loss) 48 61 12 (3 ) 118 Equity in earnings of unconsolidated affiliates 3 13 — — 16 Other income, net 1 — — — 1 Interest expense (13 ) (37 ) (2 ) (16 ) (68 ) Net Income (Loss) $ 39 $ 37 $ 10 $ (19 ) $ 67 Nine months ended September 30, 2017 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 246 $ 391 $ 130 $ — $ 767 Cost of operations 53 100 86 — 239 Depreciation and amortization 77 149 15 — 241 General and administrative — — — 14 14 Acquisition-related transaction and integration costs — — — 2 2 Operating income (loss) 116 142 29 (16 ) 271 Equity in earnings of unconsolidated affiliates 9 54 — — 63 Other income, net 1 1 — 1 3 Interest expense (39 ) (128 ) (7 ) (53 ) (227 ) Net Income (Loss) $ 87 $ 69 $ 22 $ (68 ) $ 110 Total Assets $ 1,920 $ 5,821 $ 420 $ 79 $ 8,240 Nine months ended September 30, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 246 $ 412 $ 131 $ — $ 789 Cost of operations 53 98 87 — 238 Depreciation and amortization 60 149 15 — 224 General and administrative — — — 8 8 Operating income (loss) 133 165 29 (8 ) 319 Equity in earnings of unconsolidated affiliates 10 24 — — 34 Other income, net 1 2 — — 3 Interest expense (36 ) (115 ) (5 ) (48 ) (204 ) Net Income (Loss) $ 108 $ 76 $ 24 $ (56 ) $ 152

Related Party Transactions Rela

Related Party Transactions Related Party Transactions (Tables)	9 Months Ended
	Sep. 30, 2017
Related Party Transaction
Schedule of Related Party Transactions [Table Text Block]
Operations and Maintenance services [Member]
Related Party Transaction
Schedule of Related Party Transactions [Table Text Block]	The following table summarizes material O&M costs recorded in the cost of operations line in the Company's consolidated statements of operations: Three months ended September 30, Nine months ended September 30, (in millions) 2017 2016 2017 2016 O&M costs $ 10 $ 9 $ 29 $ 28

Condensed Consolidating Finan28

Condensed Consolidating Financial Information Condensed Consolidating Financial Information (Tables)	9 Months Ended
	Sep. 30, 2017
Condensed Consolidating Financial Information Disclosure [Abstract]
Condensed Cash Flow Statement [Table Text Block]	NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Nine Months ended September 30, 2017 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Consolidated (In millions) Net Cash Provided by (Used in) Operating Activities $ — $ 38 $ 414 $ (77 ) $ 375 Cash Flows from Investing Activities Intercompany transactions between Yield LLC and subsidiaries (13 ) — — 13 — Payments for the Drop Down Assets — — — (176 ) (176 ) Capital expenditures — (3 ) (20 ) — (23 ) Cash receipts from notes receivable — — 11 — 11 Return of investment from unconsolidated affiliates — 7 9 16 32 Net investments in unconsolidated affiliates — (41 ) (7 ) — (48 ) Net Cash Used in Investing Activities (13 ) (37 ) (7 ) (147 ) (204 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement (6 ) (1 ) — 7 — Net contributions from noncontrolling interests — — — 13 13 Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets — — (42 ) (7 ) (49 ) (Payments of) proceeds from distributions (149 ) — (211 ) 211 (149 ) Payment of debt issuance costs — — (4 ) — (4 ) Proceeds from Issuance of Class C units 33 — — — 33 Proceeds from the issuance of long-term debt — external — — 41 — 41 Payments for long-term debt — — (224 ) — (224 ) Net Cash (Used in) Provided by Financing Activities (122 ) (1 ) (440 ) 224 (339 ) Net Decrease in Cash, Cash Equivalents and Restricted Cash (135 ) — (33 ) — (168 ) Cash, Cash Equivalents and Restricted Cash at Beginning of Period 211 — 275 — 486 Cash, Cash Equivalents and Restricted Cash at End of Period $ 76 $ — $ 242 $ — $ 318 NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Nine Months Ended September 30, 2016 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) Consolidated (a) (In millions) Net Cash Provided by Operating Activities $ — $ 45 $ 365 $ 34 $ 444 Cash Flows from Investing Activities Intercompany transactions from Yield LLC to subsidiaries 145 — — (145 ) — Acquisition of Drop Down Assets, net of cash acquired — — — (77 ) (77 ) Capital expenditures — — (16 ) — (16 ) Cash receipts from notes receivable — — 11 — 11 Return of investment from unconsolidated affiliates — 3 — 13 16 Net investments in unconsolidated affiliates — (48 ) — (21 ) (69 ) Net Cash Provided by (Used in) Investing Activities 145 (45 ) (5 ) (230 ) (135 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement 54 — — (54 ) — Net contributions from noncontrolling interests — — — 7 7 Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets — — (126 ) — (126 ) (Payments of) proceeds from distributions (127 ) — (204 ) 204 (127 ) Payment of debt issuance costs — — (1 ) (5 ) (6 ) Proceeds from the revolving credit facility — — — 60 60 Payments for the revolving credit facility — — — (366 ) (366 ) Proceeds from the issuance of long-term debt - external — — 200 350 550 Payments for long-term debt — — (204 ) — (204 ) Net Cash (Used in) Provided by Financing Activities (73 ) — (335 ) 196 (212 ) Net (Decrease) Increase in Cash, Cash Equivalents and Restricted Cash 72 — 25 — 97 Cash, Cash Equivalents and Restricted Cash at Beginning of Period 15 — 226 — 241 Cash, Cash Equivalents and Restricted Cash at End of Period $ 87 $ — $ 251 $ — $ 338 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business .
Condensed Balance Sheet [Table Text Block]	NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS September 30, 2017 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC Eliminations (a) Consolidated ASSETS (In millions) Current Assets Cash and cash equivalents $ 76 $ — $ 102 $ — $ — $ 178 Restricted cash — — 140 — — 140 Accounts receivable — trade — 3 123 — — 126 Accounts receivable — affiliate 1 — — — — 1 Inventory — 1 37 — — 38 Notes receivable — — 15 — — 15 Prepayments and other current assets — — 22 — — 22 Total current assets 77 4 439 — — 520 Net property, plant and equipment — 59 5,188 — — 5,247 Other Assets Investment in consolidated subsidiaries 1,828 482 — 3,134 (5,444 ) — Equity investments in affiliates — 210 598 375 — 1,183 Intangible assets, net — 55 1,179 — — 1,234 Other non-current assets — — 56 — — 56 Total other assets 1,828 747 1,833 3,509 (5,444 ) 2,473 Total Assets $ 1,905 $ 810 $ 7,460 $ 3,509 $ (5,444 ) $ 8,240 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS September 30, 2017 (Continued) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC Eliminations (a) Consolidated LIABILITIES AND MEMBERS' EQUITY (In millions) Current Liabilities Current portion of long-term debt — external $ — $ — $ 300 $ — $ — $ 300 Accounts payable — 2 25 — — 27 Accounts payable — affiliate — 5 19 21 — 45 Derivative instruments — — 23 — — 23 Accrued expenses and other current liabilities — 1 80 13 — 94 Total current liabilities — 8 447 34 — 489 Other Liabilities Long-term debt — external — — 4,074 840 — 4,914 Long-term debt — affiliate — — — 618 — 618 Accounts payable — affiliate — — 3 — — 3 Derivative instruments — — 43 — — 43 Other non-current liabilities — — 79 8 — 87 Total non-current liabilities — — 4,199 1,466 — 5,665 Total Liabilities — 8 4,646 1,500 — 6,154 Commitments and Contingencies Members' Equity Contributed capital 1,897 853 2,734 2,077 (5,664 ) 1,897 Retained earnings (accumulated deficit) 86 (49 ) 100 (171 ) 120 86 Accumulated other comprehensive loss (78 ) (2 ) (80 ) (78 ) 160 (78 ) Noncontrolling interest — — 60 181 (60 ) 181 Total Members' Equity 1,905 802 2,814 2,009 (5,444 ) 2,086 Total Liabilities and Members’ Equity $ 1,905 $ 810 $ 7,460 $ 3,509 $ (5,444 ) $ 8,240 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2016 NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (a) Eliminations (b) Consolidated (a) ASSETS (In millions) Current Assets Cash and cash equivalents $ 211 $ — $ 110 $ — $ — $ 321 Restricted cash — — 165 — — 165 Accounts receivable — trade — 2 90 — — 92 Accounts receivable — affiliate — — 1 — — 1 Inventory — 2 37 — — 39 Derivative instruments — — 2 — — 2 Notes receivable — — 16 — — 16 Prepayments and other current assets — — 19 1 — 20 Total current assets 211 4 440 1 — 656 Net property, plant and equipment — 59 5,401 — — 5,460 Other Assets Investment in consolidated subsidiaries 1,867 527 — 3,212 (5,606 ) — Equity investments in affiliates — 171 600 381 — 1,152 Intangible assets, net — 56 1,230 — — 1,286 Derivative instruments — — 1 — — 1 Other non-current assets — — 64 1 — 65 Total other assets 1,867 754 1,895 3,594 (5,606 ) 2,504 Total Assets $ 2,078 $ 817 $ 7,736 $ 3,595 $ (5,606 ) $ 8,620 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2016 (Continued) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (a) Eliminations (b) Consolidated (a) LIABILITIES AND MEMBERS' EQUITY (In millions) Current Liabilities Current portion of long-term debt — external $ — $ — $ 291 $ — $ — $ 291 Accounts payable — 2 18 3 — 23 Accounts payable — affiliate — 7 15 18 — 40 Derivative instruments — — 32 — — 32 Accrued expenses and other current liabilities — 1 60 24 — 85 Total current liabilities — 10 416 45 — 471 Other Liabilities Long-term debt — external — — 4,259 839 — 5,098 Long-term debt — affiliate — — — 618 — 618 Accounts payable — affiliate — — 9 — — 9 Derivative instruments — — 44 — — 44 Other non-current liabilities — — 76 — — 76 Total non-current liabilities — — 4,388 1,457 — 5,845 Total Liabilities — 10 4,804 1,502 — 6,316 Commitments and Contingencies Members' Equity Contributed capital 2,127 874 2,920 2,103 (5,897 ) 2,127 Retained earnings (Accumulated deficit) 36 (65 ) 35 (151 ) 181 36 Accumulated other comprehensive loss (85 ) (2 ) (87 ) (85 ) 174 (85 ) Noncontrolling Interest — — 64 226 (64 ) 226 Total Members' Equity 2,078 807 2,932 2,093 (5,606 ) 2,304 Total Liabilities and Members’ Equity $ 2,078 $ 817 $ 7,736 $ 3,595 $ (5,606 ) $ 8,620 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation.
Condensed Statement of Comprehensive Income [Table Text Block]	CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the Three Months Ended September 30, 2017 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income $ 75 $ 5 $ 50 $ 52 $ (130 ) $ 52 Other Comprehensive Income Unrealized gain on derivatives 7 — 7 7 (14 ) 7 Other comprehensive income 7 — 7 7 (14 ) 7 Comprehensive Income 82 5 57 59 (144 ) 59 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (23 ) 1 (23 ) Comprehensive Income Attributable to NRG Yield LLC $ 82 $ 5 $ 58 $ 82 $ (145 ) $ 82 (a) All significant intercompany transactions have been eliminated in consolidation. For the Nine Months ended September 30, 2017 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income $ 166 $ 18 $ 141 $ 109 $ (324 ) $ 110 Other Comprehensive Income Unrealized loss on derivatives 7 — 7 7 (14 ) 7 Other comprehensive loss 7 — 7 7 (14 ) 7 Comprehensive Income 173 18 148 116 (338 ) 117 Less: Comprehensive loss attributable to noncontrolling interests — — (3 ) (56 ) 3 (56 ) Comprehensive Income Attributable to NRG Yield LLC $ 173 $ 18 $ 151 $ 172 $ (341 ) $ 173 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the Three Months Ended September 30, 2016 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (b) Consolidated (a) (In millions) Net Income $ 105 $ 5 $ 72 $ 67 $ (182 ) $ 67 Other Comprehensive Income Unrealized gain on derivatives 11 — 19 20 (30 ) 20 Other comprehensive income 11 — 19 20 (30 ) 20 Comprehensive Income 116 5 91 87 (212 ) 87 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (30 ) 1 (30 ) Comprehensive Income Attributable to NRG Yield LLC $ 116 $ 5 $ 92 $ 117 $ (213 ) $ 117 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. For the Nine Months Ended September 30, 2016 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (b) Consolidated (a) (In millions) Net Income $ 219 $ 31 $ 174 $ 152 $ (424 ) $ 152 Other Comprehensive Loss Unrealized loss on derivatives (49 ) — (45 ) (49 ) 94 (49 ) Other comprehensive loss (49 ) — (45 ) (49 ) 94 (49 ) Comprehensive Income 170 31 129 103 (330 ) 103 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (67 ) 1 (67 ) Comprehensive Income Attributable to NRG Yield LLC $ 170 $ 31 $ 130 $ 170 $ (331 ) $ 170 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation.
Condensed Income Statement [Table Text Block]	NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Three Months Ended September 30, 2017 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Operating Revenues Total operating revenues $ — $ 6 $ 259 $ — $ — $ 265 Operating Costs and Expenses Cost of operations — 3 75 — — 78 Depreciation and amortization — 1 87 — — 88 General and administrative — — — 4 — 4 Total operating costs and expenses — 4 162 4 — 170 Operating Income (Loss) — 2 97 (4 ) — 95 Other Income (Expense) Equity in earnings (losses) of consolidated affiliates 75 (4 ) — 59 (130 ) — Equity in earnings of unconsolidated affiliates — 7 6 15 — 28 Other income, net — — 1 — — 1 Interest expense — — (54 ) (18 ) — (72 ) Total other income (expense), net 75 3 (47 ) 56 (130 ) (43 ) Net Income 75 5 50 52 (130 ) 52 Less: Net loss attributable to noncontrolling interests — — (1 ) (23 ) 1 (23 ) Net Income Attributable to NRG Yield LLC $ 75 $ 5 $ 51 $ 75 $ (131 ) $ 75 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Nine Months ended September 30, 2017 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Operating Revenues Total operating revenues $ — $ 16 $ 751 $ 1 $ (1 ) $ 767 Operating Costs and Expenses Cost of operations — 10 229 1 (1 ) 239 Depreciation and amortization — 3 238 — — 241 General and administrative — — — 14 — 14 Acquisition-related transaction and integration costs — — — 2 — 2 Total operating costs and expenses — 13 467 17 (1 ) 496 Operating Income (Loss) — 3 284 (16 ) — 271 Other Income (Expense) Equity in earnings of consolidated affiliates 165 6 — 153 (324 ) — Equity in earnings of unconsolidated affiliates — 9 28 26 — 63 Other income, net 1 — 2 — — 3 Interest expense — — (173 ) (54 ) — (227 ) Total other income (expense), net 166 15 (143 ) 125 (324 ) (161 ) Net Income 166 18 141 109 (324 ) 110 Less: Net loss attributable to noncontrolling interests — — (3 ) (56 ) 3 (56 ) Net Income Attributable to NRG Yield LLC $ 166 $ 18 $ 144 $ 165 $ (327 ) $ 166 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the Three Months Ended September 30, 2016 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (b) Consolidated (a) (In millions) Operating Revenues Total operating revenues $ — $ 7 $ 265 $ — $ — $ 272 Operating Costs and Expenses Cost of operations — 3 73 — — 76 Depreciation and amortization — 2 73 — — 75 General and administrative — — — 3 — 3 Total operating costs and expenses — 5 146 3 — 154 Operating Income (Loss) — 2 119 (3 ) — 118 Other Income (Expense) Equity in earnings of consolidated affiliates 105 4 — 73 (182 ) — Equity in earnings of unconsolidated affiliates — (1 ) 3 14 — 16 Other income, net — — 1 — — 1 Interest expense — — (51 ) (17 ) — (68 ) Total other income (expense), net 105 3 (47 ) 70 (182 ) (51 ) Net Income 105 5 72 67 (182 ) 67 Less: Net loss attributable to noncontrolling interests — — (1 ) (38 ) 1 (38 ) Net Income Attributable to NRG Yield LLC $ 105 $ 5 $ 73 $ 105 $ (183 ) $ 105 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Nine Months Ended September 30, 2016 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (b) Consolidated (a) (In millions) Operating Revenues Total operating revenues $ — $ 17 $ 772 $ — $ — $ 789 Operating Costs and Expenses Cost of operations — 10 228 — — 238 Depreciation and amortization — 4 220 — — 224 General and administrative — — — 8 — 8 Total operating costs and expenses — 14 448 8 — 470 Operating Income (Loss) — 3 324 (8 ) — 319 Other Income (Expense) Equity in income of consolidated affiliates 219 21 — 184 (424 ) — Equity in earnings of unconsolidated affiliates — 7 3 24 — 34 Other income, net — — 3 — — 3 Interest expense — — (156 ) (48 ) — (204 ) Total other income (expense), net 219 28 (150 ) 160 (424 ) (167 ) Net Income 219 31 174 152 (424 ) 152 Less: Net loss attributable to noncontrolling interests — — (1 ) (67 ) 1 (67 ) Net Income Attributable to NRG Yield LLC $ 219 $ 31 $ 175 $ 219 $ (425 ) $ 219 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation.

Nature of Business (Details)

Nature of Business (Details) $ in Millions		Aug. 02, 2017USD ($)	Mar. 27, 2017USD ($)MW	Sep. 30, 2017USD ($)MW	Sep. 30, 2016USD ($)	[3]	Aug. 01, 2017USD ($)	Sep. 01, 2016USD ($)
Nature of Business
Megawatts Thermal Equivalent, Available Under right-to-use Provisions				134
Power Generation Capacity, Megawatts	[1],[2]			5,203
Weighted Average Remaining PPA Term				16 years
Proceeds from the issuance of Class C units | $				$ 33	$ 0
Power Generation Capacity, Megawatts, including portion attributable to noncontrolling interest				5,209
Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind [Member]
Nature of Business
Power Generation Capacity, Megawatts				5,080
Distributed Solar
Nature of Business
Power Generation Capacity, Megawatts	[2]			14
Wind Farms [Member]
Nature of Business
Power Generation Capacity, Megawatts	[2]			2,200
Thermal [Member]
Nature of Business
Percentage of Ownership				100.00%
Steam and Chilled Water Capacity, Megawatts Thermal Equivalent	[2],[4]			1,319
Power Generation Capacity, Megawatts				123
Power Generation Capacity, Megawatts and Megawatt Thermal Equivalent	[2]			123
NRG Energy Center Dover [Member]
Nature of Business
Percentage of Ownership				100.00%
Conventional Generation [Member]
Nature of Business
Power Generation Capacity, Megawatts	[2]			1,945
Utility-Scale Solar
Nature of Business
Power Generation Capacity, Megawatts	[2]			921
Spring Canyon [Member] | Wind Farms [Member]
Nature of Business
Power Generation Capacity, Megawatts attributed to noncontrolling interest				6
NRG Yield LLC
Nature of Business
Proceeds from the issuance of Class C units | $				$ 33
NRG Yield LLC | NRG
Nature of Business
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest				55.10%
GenConn Middletown | Conventional Generation [Member]
Nature of Business
Equity Method Investment, Ownership Percentage				50.00%
Power Generation Capacity, Megawatts	[2]			95
GenConn Devon [Member] | Conventional Generation [Member]
Nature of Business
Equity Method Investment, Ownership Percentage				50.00%
Power Generation Capacity, Megawatts	[2]			95
Marsh Landing | Conventional Generation [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			720
El Segundo [Member] | Conventional Generation [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			550
Walnut Creek [Member] | Conventional Generation [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			485
Agua Caliente [Member] | Utility-Scale Solar
Nature of Business
Percentage of Ownership				16.00%
Power Generation Capacity, Megawatts	[2]			46
Alpine [Member] | Utility-Scale Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			66
Avenal [Member] | Utility-Scale Solar
Nature of Business
Equity Method Investment, Ownership Percentage				50.00%
Power Generation Capacity, Megawatts	[2]			23
Avra Valley | Utility-Scale Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			26
NRG Solar Blythe LLC [Member] | Utility-Scale Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			21
Borrego | Utility-Scale Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			26
CVSR [Member] | Utility-Scale Solar
Nature of Business
Equity Method Investment, Ownership Percentage				100.00%
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			250
Desert Sunlight [Member] | Utility-Scale Solar
Nature of Business
Percentage of Ownership				25.00%
Kansas South [Member] | Utility-Scale Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			20
Roadrunner | Utility-Scale Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			20
TA - High Desert LLC [Member] | Utility-Scale Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			20
Utah Portfolio [Member] | Utility-Scale Solar
Nature of Business
Percentage of Ownership	[5]			50.00%
Power Generation Capacity, Megawatts	[2],[5]			265
AZ DG Solar Projects | Distributed Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			5
PFMG DG Solar Projects | Distributed Solar
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			9
Alta I [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			150
Alta II [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			150
Alta III [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			150
Alta IV [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			102
Alta V [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			168
Alta X [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6]			100.00%
Power Generation Capacity, Megawatts	[2],[6]			137
Alta XI [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6]			100.00%
Power Generation Capacity, Megawatts	[2],[6]			90
South Trent | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			101
Spanish Fork [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			100.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			19
Laredo Ridge [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			80
Taloga [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			130
Pinnacle [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			55
Buffalo Bear [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership				100.00%
Power Generation Capacity, Megawatts	[2]			19
Spring Canyon II [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6]			90.10%
Power Generation Capacity, Megawatts	[2],[6]			29
Spring Canyon III [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6]			90.10%
Power Generation Capacity, Megawatts	[2],[6]			25
Crosswinds [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			99.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			21
Elbow Creek [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			100.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			122
Elkhorn Ridge Wind, LLC [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			66.70%
Power Generation Capacity, Megawatts	[2],[6],[7]			54
Forward [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			100.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			29
Goat Wind [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			100.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			150
Hardin [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			99.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			15
Lookout [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			100.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			38
Odin Wind Farm [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			99.90%
Power Generation Capacity, Megawatts	[2],[6],[7]			20
San Juan Mesa Wind Project, LLC [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			75.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			90
Sleeping Bear [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			100.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			95
Wildorado [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[6],[7]			100.00%
Power Generation Capacity, Megawatts	[2],[6],[7]			161
Thermal [Member] | Thermal [Member]
Nature of Business
Power Generation Capacity, Megawatts	[2]			20
NRG Energy Center Dover [Member] | Thermal [Member]
Nature of Business
Power Generation Capacity, Megawatts	[2]			103
August 2017 Drop Down Assets [Member]
Nature of Business
Acquisition of businesses, net of cash acquired | $		$ (44)
Business Acquisition, Consideration Transferred, Working Capital | $							$ 3
Business Combination, Contingent Consideration, Liability | $				$ (8)
CVSR [Member]
Nature of Business
Business Acquisition, Percentage of Voting Interests Acquired								51.05%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $								$ 496
Southern California Edison [Member] | Desert Sunlight [Member] | Utility-Scale Solar
Nature of Business
Power Generation Capacity, Megawatts	[2]			63
Pacific Gas and Electric [Member] | Desert Sunlight [Member] | Utility-Scale Solar
Nature of Business
Power Generation Capacity, Megawatts	[2]			75
Common Class D [Member] | NRG Yield LLC
Nature of Business
Sale of Stock, Percentage of Ownership after Transaction				100.00%
Common Class B [Member] | NRG Yield LLC
Nature of Business
Sale of Stock, Percentage of Ownership after Transaction				100.00%
Common Class A [Member] | NRG Yield LLC
Nature of Business
Sale of Stock, Percentage of Ownership after Transaction				100.00%
Unconsolidated Properties [Member]
Nature of Business
Power Generation Capacity, Megawatts				226
August 2017 Drop Down Assets [Member]
Nature of Business
Business Acquisition, Percentage of Voting Interests Acquired							25.00%
Agua Caliente [Member]
Nature of Business
Equity Method Investment, Ownership Percentage				16.00%
March 2017 Drop Down Assets [Member]
Nature of Business
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $			$ 328
Acquisition of businesses, net of cash acquired | $			(130)
Business Acquisition, Consideration Transferred, Working Capital | $			2
Pro-Rate Share of Debt Held by Unconsolidated Affiliates | $			$ 135
Agua Caliente Borrower 2 [Member]
Nature of Business
Percentage of NRG's Ownership			31.00%
Power Generation Capacity, Megawatts			46
Pro-Rate Share of Debt Held by Unconsolidated Affiliates | $				$ 133
Agua Caliente Borrower 2 [Member] | NRG
Nature of Business
Percentage of Ownership			51.00%
[1]	(c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,209 MWs.
[2]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2017.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(d) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 134 MWt available under the right-to-use provisions contained in agreements between two of the Company's thermal facilities and certain of its customers.
[5]	(e) Represents interests in Four Brothers Solar, LLC, Granite Mountain Holdings, LLC, and Iron Springs Holdings, LLC, all acquired as part of the March 2017 Drop Down Assets (ownership percentage is based upon cash to be distributed).
[6]	(b) Projects are part of tax equity arrangements.
[7]	(f) Projects are part of NRG Wind TE Holdco portfolio.

Summary of Significant Accoun30

Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended					9 Months Ended
	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Sep. 30, 2016	[5],[6]	Sep. 30, 2017	Sep. 30, 2016		Dec. 31, 2016
Summary of Significant Accounting Policies [Line Items]
Members' Equity Attributable to Noncontrolling Interest	$ (181,000)					$ (181,000)			$ (226,000)	[1]
Cash and cash equivalents	178,000					178,000			321,000	[2]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,189,000					1,189,000			951,000
Noncontrolling interest	181,000					181,000			226,000	[2]
Capital contributions from tax equity investors, net of distributions						13,000	$ 7,000	[3]
Distributions to NRG for NRG Wind TE Holdco						(49,000)	(126,000)	[3],[4]
Comprehensive loss	$ (23,000)			$ (30,000)		$ (56,000)	(67,000)	[5],[6]
Dividends Payable, Date Declared						Oct. 31, 2017
Common Stock, Dividends, Per Share, Declared						$ 0.288
Dividends Payable, Date to be Paid						Dec. 15, 2017
Dividends Payable, Date of Record						Dec. 1, 2017
Common Stock, Par or Stated Value Per Share	$ 0.01					$ 0.01
ATM Program, Maximum Dollar Value of Shares to Be Issued	$ 150,000					$ 150,000
Dividends Per Class A Common Share	$ 0.28	$ 0.27	$ 0.26
Intangible assets, accumulated amortization	$ 216,000					216,000			163,000
Restricted cash	140,000					$ 140,000			165,000	[2]
Sale of Stock, Number of Shares Issued in Transaction						1,921,866
Proceeds from the issuance of Class C units						$ 33,000	$ 0	[4]
Investment Banking, Advisory, Brokerage, and Underwriting Fees and Commissions						346
ATM program, dollar value of shares remaining	$ 115,000					115,000
Financial Institutions [Member]
Summary of Significant Accounting Policies [Line Items]
Capital contributions from tax equity investors, net of distributions						$ 11,000
Scenario, Previously Reported [Member]
Summary of Significant Accounting Policies [Line Items]
Members' Equity Attributable to Noncontrolling Interest									(313,000)
August 2017 Drop Down Assets [Member]
Summary of Significant Accounting Policies [Line Items]
Members' Equity Attributable to Noncontrolling Interest									$ (87,000)
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Business Acquisitions Busines31

Business Acquisitions Business Acquisitions - November 2017 Drop Down (Details) $ in Millions		Nov. 02, 2017USD ($)	Oct. 31, 2017USD ($)	Sep. 30, 2017USD ($)MW	Sep. 30, 2016USD ($)	Sep. 30, 2017USD ($)MW	Sep. 30, 2016USD ($)	Nov. 01, 2017USD ($)MW	Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Debt Issuance Costs, Net				$ 54		$ 54			$ 62
Power Generation Capacity, Megawatts | MW	[1],[2]			5,203		5,203
November 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Debt Issuance Costs, Net				$ 2		$ 2
Non-Recourse Debt				33		33
Business Acquisition, Pro Forma Revenue				269	$ 275	777	$ 798
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets				11		11
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment				84		84
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets				32		32
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets				127		127
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities	[3]			31		31
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other				3		3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				34		34
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				93		93
Business Acquisition, Pro Forma Net Income (Loss)				$ 30	$ 69	$ 90	$ 155
Subsequent Event [Member] | November 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW								38
Business Combination, Consideration Transferred		$ 71
Non-Recourse Debt								$ 26
Repayments of Debt			$ 7
[1]	(c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,209 MWs.
[2]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2017.
[3]	(a) Net of $2 million of net debt issuance costs.

Business Acquisitions Busines32

Business Acquisitions Business Combination August 2017 Drop Down (Details) - USD ($) $ in Millions	Aug. 02, 2017	Sep. 30, 2017	Aug. 01, 2017
August 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 44
Business Acquisition, Consideration Transferred, Working Capital			$ 3
Business Combination, Contingent Consideration, Liability		$ 8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net			$ 87
August 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired			25.00%

Business Acquisitions Busines33

Business Acquisitions Business Acquisitions - March 2017 Drop Down(Details) $ in Millions		Mar. 27, 2017USD ($)MW	Sep. 30, 2017USD ($)MW	Sep. 30, 2016USD ($)		Sep. 30, 2017USD ($)MW	Sep. 30, 2016USD ($)		Dec. 31, 2016USD ($)
Business Acquisition [Line Items]
Revenues			$ 265	$ 272	[1],[2]	$ 767	$ 789	[1],[2]
Power Generation Capacity, Megawatts | MW	[3],[4]		5,203			5,203
Equity investments in affiliates			$ 1,183			$ 1,183			$ 1,152	[5]
Debt Issuance Costs, Net			54			54			$ 62
Operating Income (Loss)			95	118	[1],[2]	271	319	[1],[2]
Net Income			52	67	[1],[2]	110	152	[1],[2],[6],[7]
Net Income (Loss) Attributable to Parent			$ 75	105	[1],[2]	$ 166	219	[1],[2]
Agua Caliente [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage			16.00%			16.00%
Agua Caliente Borrower 2 [Member]
Business Acquisition [Line Items]
Percentage of NRG's Ownership		31.00%
Power Generation Capacity, Megawatts | MW		46
Power Purchase Agreement Period		25 years
Remaining Power Purchase Agreement term		22 years
Non-Recourse Debt		$ 41
Pro-Rate Share of Debt Held by Unconsolidated Affiliates			$ 133			$ 133
Utah Portfolio [Member]
Business Acquisition [Line Items]
Revenues			$ 23	0		$ 60	0
Remaining Power Purchase Agreement term		20 years
Percentage of Cash Available for Distributions			50.00%			50.00%
Non-Recourse Debt		$ 287
Operating Income (Loss)			$ 9	0		$ 17	0
Net Income			$ 9	0		$ 17	0
March 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Revenues				0			0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		6
Business Combination, Consideration Transferred		130
Business Acquisition, Consideration Transferred, Working Capital		2
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt		328
Pro-Rate Share of Debt Held by Unconsolidated Affiliates		135
Business Combination, Separately Recognized Transactions, Net Gains and Losses		8
Equity investments in affiliates		456
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		462
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Financial Liabilities	[8]	320
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other		3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		323
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		139
Debt Issuance Costs, Net		$ 8
Operating Income (Loss)				0			0
Net Income				3			5
Net Income (Loss) Attributable to Parent				3			5
August 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Revenues				0			0
Operating Income (Loss)				0			0
Net Income				0			0
Net Income (Loss) Attributable to Parent				2			5
NRG [Member] | Agua Caliente Borrower 2 [Member]
Business Acquisition [Line Items]
Percentage of Ownership		51.00%
NRG [Member] | Utah Portfolio [Member]
Business Acquisition [Line Items]
Percentage of Cash Available for Distributions		50.00%
Scenario, Previously Reported [Member]
Business Acquisition [Line Items]
Revenues				272			789
Operating Income (Loss)				118			319
Net Income				64			147
Net Income (Loss) Attributable to Parent				$ 100			$ 209
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,209 MWs.
[4]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2017.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[7]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[8]	(a) Net of $8 million of debt issuance costs.

Business Acquisitions Busines34

Business Acquisitions Business Acquisitions - CVSR (Details) - USD ($) $ in Millions	Mar. 27, 2017	Sep. 02, 2016	Sep. 30, 2017	Dec. 31, 2016	Sep. 01, 2016
Business Acquisition [Line Items]
Long-term Debt			$ 5,886	$ 6,069
CVSR [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					51.05%
Payments to Acquire Businesses, Gross		$ 78.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					$ 496
March 2017 Drop Down Assets [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt	$ 328
Business Combination, Separately Recognized Transactions, Net Gains and Losses	8
Business Combination, Consideration Transferred	$ 130
CVSR [Member]
Business Acquisition [Line Items]
Business Combination, Separately Recognized Transactions, Net Gains and Losses		112
Business Combination, Consideration Transferred		$ 6
Utility-Scale Solar [Member] | CVSR [Member]
Business Acquisition [Line Items]
Percentage of Ownership			100.00%
CVSR Financing Agreement [Member]
Business Acquisition [Line Items]
Long-term Debt			$ 746	771
CVSR Financing Agreement [Member] | CVSR [Member]
Business Acquisition [Line Items]
Long-term Debt					771
CVSR Holdco due 2037 [Member]
Business Acquisition [Line Items]
Long-term Debt			$ 194	$ 199
CVSR Holdco due 2037 [Member] | CVSR [Member]
Business Acquisition [Line Items]
Long-term Debt					$ 200

Variable Interest Entities Vari

Variable Interest Entities Variable Interest Entities - Consolidated Entities (Details) - USD ($) $ in Millions	Sep. 30, 2017	Dec. 31, 2016	[1]
Schedule of Equity Method Investments [Line Items]
Total other assets	$ 2,473	$ 2,504
Net property, plant and equipment	5,247	5,460
Total Assets	8,240	8,620
Total Liabilities	6,154	$ 6,316
November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	175
Net property, plant and equipment	417
Intangible Assets, Net (Excluding Goodwill)	2
Total Assets	594
Total Liabilities	206
Noncontrolling Interest in Variable Interest Entity	22
Net Assets	366
Alta X and XI TE Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	17
Net property, plant and equipment	443
Intangible Assets, Net (Excluding Goodwill)	265
Total Assets	725
Total Liabilities	9
Noncontrolling Interest in Variable Interest Entity	96
Net Assets	620
Spring Canyon [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	4
Net property, plant and equipment	96
Intangible Assets, Net (Excluding Goodwill)	0
Total Assets	100
Total Liabilities	6
Noncontrolling Interest in Variable Interest Entity	63
Net Assets	$ 31
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Va36

Variable Interest Entities Variable Interest Entities - Unconsolidated Entities (Details) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2017USD ($)MW	Sep. 30, 2016USD ($)		Sep. 30, 2017USD ($)MW	Sep. 30, 2016USD ($)		Oct. 12, 2017USD ($)	Dec. 31, 2016USD ($)
Schedule of Equity Method Investments [Line Items]
Total operating revenues		$ 265	$ 272	[1],[2]	$ 767	$ 789	[1],[2]
Equity investments in affiliates		1,183			1,183				$ 1,152	[3]
Operating Income (Loss)		95	118	[1],[2]	271	319	[1],[2]
Net Income (Loss)		52	67	[1],[2]	110	152	[1],[2],[4],[5]
Total current assets		520			520				656	[3]
Current Liabilities		489			489				471	[3]
Total non-current liabilities		$ 5,665			$ 5,665				5,845	[3]
Power Generation Capacity, Megawatts | MW	[6],[7]	5,203			5,203
NRG DGPV Holdco 3 [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Subsidiaries and Affiliates					$ 4
Equity investments in affiliates		$ 20			20
Due to Affiliate		$ 16			$ 16
Power Generation Capacity, Megawatts | MW		33			33
Remaining Lease Term					20 years
Utah Portfolio [Member]
Schedule of Equity Method Investments [Line Items]
Total operating revenues		$ 23	0		$ 60	0
Operating Income (Loss)		9	0		17	0
Net Income (Loss)		9	$ 0		17	$ 0
Total current assets		25			25				20
Assets, Noncurrent		1,091			1,091				1,105
Current Liabilities		9			9				14
Total non-current liabilities		21			21				$ 38
Four Brothers Solar [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		221			221
Granite Mountain Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		81			81
Iron Springs Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		56			56
NRG DGPV Holdco 1 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		71			71
NRG DGPV Holdco 2 [Member]
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Interest in Subsidiaries and Affiliates					37
Equity investments in affiliates		54			54
Due to Affiliate		2			$ 2
Remaining Lease Term					21 years
NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		65			$ 65
Gen Conn Energy LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		102			102
Tax Equity Financed Portfolio of Leases [Member] | Maximum [Member] | NRG DGPV Holdco 3 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		50			50
Tax Equity Financed Portfolio of Leases [Member] | Maximum [Member] | NRG DGPV Holdco 2 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		$ 50			$ 50
Subsequent Event [Member] | Tax Equity Financed Portfolio of Leases [Member] | Maximum [Member] | NRG DGPV Holdco 2 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates								$ 60
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,209 MWs.
[7]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2017.

Variable Interest Entities Va37

Variable Interest Entities Variable Interest Entities - Utah Solar Portfolio (Details) - Utah Portfolio [Member]	Sep. 30, 2017
Variable Interest Entity [Line Items]
Percentage of Cash Available for Distributions	50.00%
Capital Unit, Class A [Member]
Variable Interest Entity [Line Items]
Percentage of Ownership	100.00%
Financial Institutions [Member] | Capital Unit, Class B [Member]
Variable Interest Entity [Line Items]
Taxable Income Allocation, Pre-Flip	99.00%
Taxable Income Allocation, Post-Flip	50.00%

Variable Interest Entities Va38

Variable Interest Entities Variable Interest Entities - Debt Held by Unconsolidated Affiliates (Details) $ in Millions		9 Months Ended
		Sep. 30, 2017USD ($)MW	Mar. 27, 2017MW	Dec. 31, 2016USD ($)	Feb. 29, 2016MW
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW	[1],[2]	5,203
Long-term Debt | $		$ 5,886		$ 6,069
NRG DGPV Holdco 2 [Member]
Schedule of Equity Method Investments [Line Items]
Remaining Lease Term		21 years
Agua Caliente Borrower 2 [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW			46
Pro-Rate Share of Debt Held by Unconsolidated Affiliates | $		$ 133
Agua Caliente [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		16.00%
Long-term Debt | $		$ 833
Debt Instrument, Basis Spread on Libor Rate		0.375%
Tax Equity Financed Portfolio of Leases - Commercial PV 1 [Member] | NRG DGPV Holdco 2 [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW					107
[1]	(c) The Company's total generation capacity is net of 6 MWs for noncontrolling interest for Spring Canyon II and III. The Company's generation capacity including this noncontrolling interest was 5,209 MWs.
[2]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2017.

Fair Value of Financial Instr39

Fair Value of Financial Instruments Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Millions		Sep. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt — affiliate		$ 618	$ 618	[1]
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Net	[2]	18	30
Long-term debt — affiliate		618
Long-term Debt and Capital Lease Obligations, Including Current Maturities	[3]	5,268	5,451
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Net	[2]	18	30
Long-term debt — affiliate		626	608
Long-term Debt and Capital Lease Obligations, Including Current Maturities	[3]	5,301	5,435
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities		884	833
Estimate of Fair Value Measurement [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities		$ 5,043	$ 5,210
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Includes the long-term portion of notes receivable, which is recorded in other noncurrent assets on the Company's consolidated balance sheets.
[3]	(b) Excludes deferred financing costs, which are recorded as a reduction to long-term debt on the Company's consolidated balance sheets.

Fair Value of Financial Instr40

Fair Value of Financial Instruments Fair Value of Financial Instruments - Recurring Fair Value (Details) - USD ($)		Sep. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset			$ 3,000,000
Derivative Liability, Fair Value, Gross Liability		$ 66,000,000	76,000,000
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]		1,000,000
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	0	2,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]		0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability, Fair Value, Gross Liability	[1]	66,000,000	76,000,000
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net		0	0
Interest Rate Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset			1,000,000
Derivative Liability, Fair Value, Gross Liability			75,000,000
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]		0
Derivative Liability, Fair Value, Gross Liability	[1]		0
Interest Rate Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	0	1,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	64,000,000	75,000,000
Commodity Contract [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset			2,000,000
Derivative Liability, Fair Value, Gross Liability			1,000,000
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]		1,000,000
Derivative Liability, Fair Value, Gross Liability	[1]		0
Commodity Contract [Member] | Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset	[1]	0	1,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	$ 2,000,000	$ 1,000,000
[1]	(a) There were no derivative assets or liabilities classified as Level 1 as of September 30, 2017. There were no derivative assets or liabilities classified as Level 3 as of September 30, 2017 and December 31, 2016.

Fair Value of Financial Instr41

Fair Value of Financial Instruments Fair Value of Financial Instruments - Credit Risk and Derivative FV Measurements (Details) $ in Millions	9 Months Ended
	Sep. 30, 2017USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Assets, Measured on Recurring Basis, Valuation Techniques, Impact of Credit Reserve to Fair Value	$ 1
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 2,900
Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period	5 years

Accounting for Derivative Ins42

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					$ 3
Derivative Liability, Fair Value, Gross Liability	$ 66		$ 66		76
Derivative, Collateral, Right to Reclaim Cash	0		0		0
Derivative, Collateral, Obligation to Return Cash	0		0		0
Fair Value of Gross Derivative Assets/(Liabilities), Net					(73)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset					0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral					(73)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					1
Derivative Liability, Fair Value, Gross Liability	20		20		65
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					2
Derivative Liability, Fair Value, Gross Liability	46		46		11
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					2
Derivative Liability, Fair Value, Gross Liability					1
Derivative Asset, Fair Value, Gross Liability					0
Derivative Asset					2
Derivative Liability, Fair Value, Gross Asset					0
Derivative Liability					1
Fair Value of Gross Derivative Assets/(Liabilities), Net					1
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset					0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral					1
Interest Rate Contract Current [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					0
Derivative Liability, Fair Value, Gross Liability	7		7		26
Interest Rate Contract Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					0
Derivative Liability, Fair Value, Gross Liability	15		15		5
Interest Rate Contract Non Current [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					1
Derivative Liability, Fair Value, Gross Liability	13		13		39
Interest Rate Contract Non Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					0
Derivative Liability, Fair Value, Gross Liability	29		29		5
Commodity Contract Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					2
Derivative Liability, Fair Value, Gross Liability	1		1		1
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					1
Derivative Liability, Fair Value, Gross Liability					75
Derivative Asset, Fair Value, Gross Liability					1
Derivative Asset					0
Derivative Liability, Fair Value, Gross Asset					1
Derivative Liability					74
Fair Value of Gross Derivative Assets/(Liabilities), Net					(74)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset					0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral					(74)
Commodity Contract Non Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset					0
Derivative Liability, Fair Value, Gross Liability	1		1		0
United States of America, Dollars | Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,983		1,983		2,070
MMbtu [Member] | Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2		2		$ 3
Interest Expense [Member] | Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Unrealized Gain (Loss) on Derivatives	$ (7)	$ (2)	$ 2	$ 7

Accounting for Derivative Ins43

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - AOCI (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Jun. 30, 2017	Dec. 31, 2016	Jun. 30, 2016	Dec. 31, 2015
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (79)	$ (148)	$ (79)	$ (148)	$ (86)	$ (86)	$ (168)	$ (99)
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	5	6	13	13
Mark-to-market of cash flow hedge accounting contracts	2	14	(6)	(62)
Losses expected to be realized from OCL during the next 12 months			17
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			0	0
Noncontrolling Interest [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	(1)	(2)	(1)	(2)
Successor [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (78)	$ (146)	$ (78)	$ (146)

Accounting for Derivative Ins44

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - Impact on Statement of Operations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	$ (7,000,000)	$ (2,000,000)	$ 2,000,000	$ 7,000,000
Commodity Contract [Member] | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives			$ 0

Long-term Debt Long-term Debt -

Long-term Debt Long-term Debt - Debt Table (Details) - USD ($) $ in Millions		2 Months Ended		9 Months Ended
		Dec. 31, 2016		Sep. 30, 2017	Mar. 27, 2017
Debt Instrument [Line Items]
Long-term debt — affiliate		$ 618	[1]	$ 618
Long-term Debt		6,069		5,886
Current portion of long-term debt — external		(291)	[1]	(300)
Deferred Finance Costs, Net		(62)		(54)
Long-term Debt, Excluding Current Maturities		5,716		5,532
5.375% Senior Notes due in 2024 [Member]
Debt Instrument [Line Items]
Senior Notes		500		$ 500
Debt Instrument, Interest Rate, Stated Percentage	[2]			5.375%
5.00% Senior Notes due in 2026 [Member]
Debt Instrument [Line Items]
Senior Notes		350		$ 350
Debt Instrument, Interest Rate, Stated Percentage	[2]			5.00%
Agua Caliente Borrower 2 [Member]
Debt Instrument [Line Items]
Long-term Debt		0		$ 41
Debt Instrument, Interest Rate, Stated Percentage	[2]			5.43%
Intercompany Credit Agreement due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt — affiliate		337		$ 337
Debt Instrument, Interest Rate, Stated Percentage	[2]			3.58%
Intercompany Credit Agreement due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt — affiliate		281		$ 281
Debt Instrument, Interest Rate, Stated Percentage	[2]			3.325%
NRG Yield Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	[2]			1 month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			2.75%
West Holdings Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt		443		$ 400
Debt Instrument, Description of Variable Rate Basis	[2]			3-Month LIBOR
West Holdings Credit Agreement due 2023 Tranche A [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	[2]			1.75%
Marsh Landing Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt		370		$ 334
Walnut Creek Energy, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt		310		$ 279
Debt Instrument, Description of Variable Rate Basis	[2]			3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			1.625%
Tapestry Wind LLC due in 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt		172		$ 165
Debt Instrument, Description of Variable Rate Basis	[2]			3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			1.625%
Viento Funding II, Inc., due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt		178		$ 169
Debt Instrument, Description of Variable Rate Basis	[2]			3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			3.00%
NRG Energy Center Minneapolis LLC Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt		96		$ 82
NRG Energy Center Minneapolis Series D Notes [Member]
Debt Instrument [Line Items]
Long-term Debt		125		$ 125
Debt Instrument, Interest Rate, Stated Percentage	[2]			3.55%
Laredo Ridge Wind, LLC, due in 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt		100		$ 96
Debt Instrument, Description of Variable Rate Basis	[2]			3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			1.875%
Other Debt [Member]
Debt Instrument [Line Items]
Long-term Debt		440		$ 425
Letters of Credit Outstanding, Amount				37
Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt		287		$ 284	$ 287
Debt Instrument, Description of Variable Rate Basis	[2]			1-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			2.625%
Proceeds from Issuance of Debt		65
Project [Domain]
Debt Instrument [Line Items]
Long-term Debt		4,601		$ 4,418
West Holdings Credit Agreement due 2023 Tranche B [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate	[2]			2.375%
Marsh Landing Tranche A due December 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	[2]			3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			1.75%
Marsh Landing Tranche B due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis	[2]			3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			1.875%
Alpine Financing Agreement, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt		145		$ 138
Debt Instrument, Description of Variable Rate Basis	[2]			3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate	[2]			1.75%
Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member]
Debt Instrument [Line Items]
Long-term Debt		965		$ 940
NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]			5.95%
NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]			7.25%
CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt		771		$ 746
CVSR Holdco due 2037 [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 199		$ 194
Debt Instrument, Interest Rate, Stated Percentage	[2]			4.68%
Letter of Credit [Member] | Agua Caliente Borrower 2 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				$ 17
Letter of Credit [Member] | NRG Yield Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				68
Letter of Credit [Member] | West Holdings Credit Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				102
Letter of Credit [Member] | Marsh Landing Term Loan Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				34
Letter of Credit [Member] | Walnut Creek Energy, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				49
Letter of Credit [Member] | Tapestry Wind LLC due in 2021 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				20
Letter of Credit [Member] | Viento Funding II, Inc., due in 2023 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				27
Letter of Credit [Member] | NRG Energy Center Minneapolis LLC Senior Secured Notes [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				0
Letter of Credit [Member] | NRG Energy Center Minneapolis Series D Notes [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				0
Letter of Credit [Member] | Laredo Ridge Wind, LLC, due in 2026 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				10
Letter of Credit [Member] | Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				13
Letter of Credit [Member] | Alpine Financing Agreement, due 2022 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				37
Letter of Credit [Member] | Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				103
Letter of Credit [Member] | CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				0
Letter of Credit [Member] | CVSR Holdco due 2037 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				$ 13
Minimum [Member] | Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]			5.696%
Minimum [Member] | CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]			2.339%
Maximum [Member] | Alta Wind I-V, lease financing arrangement, due 2034 and 2035 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]			7.015%
Maximum [Member] | CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[2]			3.775%
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a)As of September 30, 2017, L+equals 3 month LIBOR plus x%, except for the Utah Solar Portfolio, where L+equals 1 month LIBOR plus x%

Long-term Debt Long-term Debt46

Long-term Debt Long-term Debt - Debt Disclosures (Details) - USD ($) $ in Millions		2 Months Ended	9 Months Ended
		Dec. 31, 2016	Sep. 30, 2017	Mar. 27, 2017	Mar. 16, 2017	Feb. 17, 2017	Nov. 02, 2016
Debt Instrument [Line Items]
Long-term Debt		$ 6,069	$ 5,886
NRG Yield Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Fair Value of Amount Outstanding			$ 0
Debt Instrument, Basis Spread on Variable Rate	[1]		2.75%
NRG Energy Center Minneapolis Series F Notes [Member]
Debt Instrument [Line Items]
Credit Facility, Maximum Borrowing Capacity, Amendment					$ 10
Debt Instrument, Interest Rate, Stated Percentage			4.60%
Line of Credit Facility, Maximum Borrowing Capacity			$ 80
Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt		287	$ 284	$ 287
Debt Instrument, Basis Spread on Variable Rate	[1]		2.625%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt							$ 222
Proceeds from Issuance of Debt		65
Agua Caliente Borrower 1, due 2038 [Member]
Debt Instrument [Line Items]
Long-term Debt						$ 130
Agua Caliente Borrower 2 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	[1]		5.43%
Long-term Debt		$ 0	$ 41
Letter of Credit [Member] | NRG Yield Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			68
Letter of Credit [Member] | Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			13
Letter of Credit [Member] | Agua Caliente Borrower 2 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			$ 17
[1]	(a)As of September 30, 2017, L+equals 3 month LIBOR plus x%, except for the Utah Solar Portfolio, where L+equals 1 month LIBOR plus x%

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016		Dec. 31, 2016	[5]
Segment Reporting
Operating revenues	$ 265	$ 272	[1],[2]	$ 767	$ 789	[1],[2]
Cost of operations	78	76		239	238
Depreciation and amortization	88	75	[1],[2]	241	224	[1],[2]
General and administrative	4	3	[1],[2]	14	8	[1],[2]
Business Combination, Acquisition Related Costs	0	0	[2]	2	0	[2]
Operating Income	95	118	[1],[2]	271	319	[1],[2]
Equity in earnings of unconsolidated affiliates	28	16	[1],[2]	63	34	[1],[2],[3]
Other income, net	1	1	[1],[2]	3	3	[1],[2]
Interest expense	(72)	(68)	[1],[2]	(227)	(204)	[1],[2]
Net Income	52	67	[1],[2]	110	152	[1],[2],[3],[4]
Total Assets	8,240			8,240			$ 8,620
Conventional Generation [Member]
Segment Reporting
Operating revenues	88	82		246	246
Cost of operations	16	14		53	53
Depreciation and amortization	27	20		77	60
General and administrative	0	0		0	0
Business Combination, Acquisition Related Costs				0
Operating Income	45	48		116	133
Equity in earnings of unconsolidated affiliates	3	3		9	10
Other income, net	1	1		1	1
Interest expense	(13)	(13)		(39)	(36)
Net Income	36	39		87	108
Total Assets	1,920			1,920
Corporate
Segment Reporting
Operating revenues	0	0		0	0
Cost of operations	0	0		0	0
Depreciation and amortization	0	0		0	0
General and administrative	4	3		14	8
Business Combination, Acquisition Related Costs				2
Operating Income	(4)	(3)		(16)	(8)
Equity in earnings of unconsolidated affiliates	0	0		0	0
Other income, net	0	0		1	0
Interest expense	(18)	(16)		(53)	(48)
Net Income	(22)	(19)		(68)	(56)
Total Assets	79			79
Thermal [Member]
Segment Reporting
Operating revenues	46	48		130	131
Cost of operations	29	31		86	87
Depreciation and amortization	5	5		15	15
General and administrative	0	0		0	0
Business Combination, Acquisition Related Costs				0
Operating Income	12	12		29	29
Equity in earnings of unconsolidated affiliates	0	0		0	0
Other income, net	0	0		0	0
Interest expense	(2)	(2)		(7)	(5)
Net Income	10	10		22	24
Total Assets	420			420
Renewables
Segment Reporting
Operating revenues	131	142		391	412
Cost of operations	33	31		100	98
Depreciation and amortization	56	50		149	149
General and administrative	0	0		0	0
Business Combination, Acquisition Related Costs				0
Operating Income	42	61		142	165
Equity in earnings of unconsolidated affiliates	25	13		54	24
Other income, net	0	0		1	2
Interest expense	(39)	(37)		(128)	(115)
Net Income	28	$ 37		69	$ 76
Total Assets	$ 5,821			$ 5,821
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016		Sep. 30, 2017	Sep. 30, 2016		Dec. 31, 2016
Related Party Transaction
General and administrative	$ 4	$ 3	[1],[2]	$ 14	$ 8	[1],[2]
Accounts payable — affiliate	45			45			$ 40	[3]
Due to Affiliate, Noncurrent	618			618			618	[3]
NRG [Member]
Related Party Transaction
Revenues	3	4		10	10
NRG RENOM [Member]
Related Party Transaction
Due to Affiliate	4			4			5
Related Party Transaction, Expenses from Transactions with Related Party	6	4		16	9
NRG Yield [Member] | NRG [Member]
Related Party Transaction
General and administrative	2	1		8	6
NRG Yield [Member] | NRG [Member] | Scenario, Plan [Member]
Related Party Transaction
Management Services Fee, Annual				8
Thermal [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party	1	1		7	6
Marsh Landing [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party	4	4		10	9
Operations and Maintenance services [Member] | NRG [Member]
Related Party Transaction
Due to Affiliate	21			21			$ 22
Due to Affiliate, Noncurrent	3			3
Related Party Transaction, Expenses from Transactions with Related Party	10	9		29	28
Operations and Maintenance services [Member] | GCE Holding LLC [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party	$ 1	$ 1		$ 4	$ 4
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidating Finan49

Condensed Consolidating Financial Information CP Income Statement (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016		Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]
Total operating revenues		$ 265		$ 272	[1],[2]	$ 767		$ 789	[1],[2]
Operating Costs and Expenses
Cost of operations		78		76	[1],[2]	239		238	[1],[2]
Depreciation and amortization		88		75	[1],[2]	241		224	[1],[2]
General and administrative		4		3	[1],[2]	14		8	[1],[2]
Business Combination, Acquisition Related Costs		0		0	[2]	2		0	[2]
Total operating costs and expenses		170		154	[1],[2]	496		470	[1],[2]
Operating Income (Loss)		95		118	[1],[2]	271		319	[1],[2]
Costs and Expenses [Abstract]
Equity in earnings (losses) of consolidated affiliates		0		0	[1]	0		0	[1]
Equity in earnings of unconsolidated affiliates		28		16	[1],[2]	63		34	[1],[2],[3]
Other income, net		1		1	[1],[2]	3		3	[1],[2]
Interest expense		72		68	[1],[2]	227		204	[1],[2]
Total other income (expense), net		(43)		(51)	[1],[2]	(161)		(167)	[1],[2]
Net Income (Loss)		52		67	[1],[2]	110		152	[1],[2],[3],[4]
Less: Net loss attributable to noncontrolling interests		(23)		(38)	[1],[2]	(56)		(67)	[1],[2]
Net Income Attributable to NRG Yield LLC		75		105	[1],[2]	166		219	[1],[2]
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		6		7		16		17
Operating Costs and Expenses
Cost of operations		3		3		10		10
Depreciation and amortization		1		2		3		4
General and administrative		0		0		0		0
Business Combination, Acquisition Related Costs						0
Total operating costs and expenses		4		5		13		14
Operating Income (Loss)		2		2		3		3
Costs and Expenses [Abstract]
Equity in earnings (losses) of consolidated affiliates		(4)		4		6		21
Equity in earnings of unconsolidated affiliates		7		(1)		9		7
Other income, net		0		0		0		0
Interest expense		0		0		0		0
Total other income (expense), net		3		3		15		28
Net Income (Loss)		5		5		18		31
Less: Net loss attributable to noncontrolling interests		0		0		0		0
Net Income Attributable to NRG Yield LLC		5		5		18		31
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		259		265	[1]	751		772	[1]
Operating Costs and Expenses
Cost of operations		75		73	[1]	229		228	[1]
Depreciation and amortization		87		73	[1]	238		220	[1]
General and administrative		0		0	[1]	0		0	[1]
Business Combination, Acquisition Related Costs						0
Total operating costs and expenses		162		146	[1]	467		448	[1]
Operating Income (Loss)		97		119	[1]	284		324	[1]
Costs and Expenses [Abstract]
Equity in earnings (losses) of consolidated affiliates		0		0	[1]	0		0	[1]
Equity in earnings of unconsolidated affiliates		6		3	[1]	28		3	[1]
Other income, net		1		1	[1]	2		3	[1]
Interest expense		54		51	[1]	173		156	[1]
Total other income (expense), net		(47)		(47)	[1]	(143)		(150)	[1]
Net Income (Loss)		50		72	[1]	141		174	[1],[4]
Less: Net loss attributable to noncontrolling interests		(1)		(1)	[1]	(3)		(1)	[1]
Net Income Attributable to NRG Yield LLC		51		73	[1]	144		175	[1]
NRG Yield LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0	[1]	0		0	[1]
Operating Costs and Expenses
Cost of operations		0		0	[1]	0		0	[1]
Depreciation and amortization		0		0	[1]	0		0	[1]
General and administrative		0		0	[1]	0		0	[1]
Business Combination, Acquisition Related Costs						0
Total operating costs and expenses		0		0	[1]	0		0	[1]
Operating Income (Loss)		0		0	[1]	0		0	[1]
Costs and Expenses [Abstract]
Equity in earnings (losses) of consolidated affiliates		75		105	[1]	165		219	[1]
Equity in earnings of unconsolidated affiliates		0		0	[1]	0		0	[1]
Other income, net		0		0	[1]	1		0	[1]
Interest expense		0		0	[1]	0		0	[1]
Total other income (expense), net		75		105	[1]	166		219	[1]
Net Income (Loss)		75		105	[1],[4]	166		219	[1],[4]
Less: Net loss attributable to noncontrolling interests		0		0	[1]	0		0	[1]
Net Income Attributable to NRG Yield LLC		75		105	[1]	166		219	[1]
NRG Yield Operating LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0	[1]	1		0	[1]
Operating Costs and Expenses
Cost of operations		0		0	[1]	1		0	[1]
Depreciation and amortization		0		0	[1]	0		0	[1]
General and administrative		4		3	[1]	14		8	[1]
Business Combination, Acquisition Related Costs						2
Total operating costs and expenses		4		3	[1]	17		8	[1]
Operating Income (Loss)		(4)		(3)	[1]	(16)		(8)	[1]
Costs and Expenses [Abstract]
Equity in earnings (losses) of consolidated affiliates		59		73	[1]	153		184	[1]
Equity in earnings of unconsolidated affiliates		15		14	[1]	26		24	[1]
Other income, net		0		0	[1]	0		0	[1]
Interest expense		18		17	[1]	54		48	[1]
Total other income (expense), net		56		70	[1]	125		160	[1]
Net Income (Loss)		52		67	[1],[4]	109		152	[1],[4]
Less: Net loss attributable to noncontrolling interests		(23)		(38)	[1]	(56)		(67)	[1]
Net Income Attributable to NRG Yield LLC		75		105	[1]	165		219	[1]
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0	[5]	0	[6]	(1)	[5]	0	[6]
Operating Costs and Expenses
Cost of operations		0	[5]	0	[6]	(1)	[5]	0	[6]
Depreciation and amortization		0	[5]	0	[6]	0	[5]	0	[6]
General and administrative		0	[5]	0	[6]	0	[5]	0	[6]
Business Combination, Acquisition Related Costs	[5]					0
Total operating costs and expenses		0	[5]	0	[6]	(1)	[5]	0	[6]
Operating Income (Loss)		0	[5]	0	[6]	0	[5]	0	[6]
Costs and Expenses [Abstract]
Equity in earnings (losses) of consolidated affiliates		(130)	[5]	(182)	[6]	(324)	[5]	(424)	[6]
Equity in earnings of unconsolidated affiliates		0	[5]	0	[6]	0	[5]	0	[6]
Other income, net		0	[5]	0	[6]	0	[5]	0	[6]
Interest expense		0	[5]	0	[6]	0	[5]	0	[6]
Total other income (expense), net		(130)	[5]	(182)	[6]	(324)	[5]	(424)	[6]
Net Income (Loss)		(130)	[5]	(182)	[6]	(324)	[5]	(424)	[6],[7]
Less: Net loss attributable to noncontrolling interests		1	[5]	1	[6]	3	[5]	1	[6]
Net Income Attributable to NRG Yield LLC		(131)	[5]	$ (183)	[6]	(327)	[5]	$ (425)	[6]
5.00% Senior Notes due in 2026 [Member]
Condensed Income Statements, Captions [Line Items]
Senior Notes		$ 350				$ 350				$ 350
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan50

Condensed Consolidating Financial Information CP Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	$ 52		$ 67	[1],[2]	$ 110		$ 152	[1],[2],[3],[4]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		20	[4],[5]	7		(49)	[4],[5]
Other Comprehensive Income (Loss), Net of Tax	7		20	[4],[5]	7		(49)	[4],[5]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	59		87	[4],[5]	117		103	[4],[5]
Less: Comprehensive loss attributable to noncontrolling interests	(23)		(30)	[4],[5]	(56)		(67)	[4],[5]
Comprehensive Income Attributable to NRG Yield LLC	82		117	[4],[5]	173		170	[4],[5]
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	5		5		18		31
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0		0		0		0
Other Comprehensive Income (Loss), Net of Tax	0		0		0		0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	5		5		18		31
Less: Comprehensive loss attributable to noncontrolling interests	0		0		0		0
Comprehensive Income Attributable to NRG Yield LLC	5		5		18		31
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	50		72	[1]	141		174	[1],[4]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		19	[4]	7		(45)	[4]
Other Comprehensive Income (Loss), Net of Tax	7		19	[4]	7		(45)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	57		91	[4]	148		129	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(1)		(1)	[4]	(3)		(1)	[4]
Comprehensive Income Attributable to NRG Yield LLC	58		92	[4]	151		130	[4]
NRG Yield LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	75		105	[1],[4]	166		219	[1],[4]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		11	[4]	7		(49)	[4]
Other Comprehensive Income (Loss), Net of Tax	7		11	[4]	7		(49)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	82		116	[4]	173		170	[4]
Less: Comprehensive loss attributable to noncontrolling interests	0		0	[4]	0		0	[4]
Comprehensive Income Attributable to NRG Yield LLC	82		116	[4]	173		170	[4]
NRG Yield Operating LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	52		67	[1],[4]	109		152	[1],[4]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		20	[4]	7		(49)	[4]
Other Comprehensive Income (Loss), Net of Tax	7		20	[4]	7		(49)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	59		87	[4]	116		103	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(23)		(30)	[4]	(56)		(67)	[4]
Comprehensive Income Attributable to NRG Yield LLC	82		117	[4]	172		170	[4]
Consolidation, Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(130)	[6]	(182)	[7]	(324)	[6]	(424)	[7],[8]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(14)	[6]	(30)	[8]	(14)	[6]	94	[8]
Other Comprehensive Income (Loss), Net of Tax	(14)	[6]	(30)	[8]	(14)	[6]	94	[8]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(144)	[6]	(212)	[8]	(338)	[6]	(330)	[8]
Less: Comprehensive loss attributable to noncontrolling interests	1	[9]	1	[8]	3	[9]	1	[8]
Comprehensive Income Attributable to NRG Yield LLC	$ (145)	[9]	$ (213)	[8]	$ (341)	[9]	$ (331)	[8]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.
[8]	(b) All significant intercompany transactions have been eliminated in consolidation.
[9]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan51

Condensed Consolidating Financial Information CP Balance Sheet (Details) - USD ($)	Sep. 30, 2017		Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	$ 178,000,000		$ 321,000,000	[1]
Restricted cash	140,000,000		165,000,000	[1]
Accounts receivable — trade	126,000,000		92,000,000	[1]
Accounts receivable — affiliate	1,000,000		1,000,000	[1]
Inventory	38,000,000		39,000,000	[1]
Notes receivable	15,000,000		16,000,000	[1]
Prepayments and other current assets	22,000,000		20,000,000	[1]
Total current assets	520,000,000		656,000,000	[1]
Net property, plant and equipment	5,247,000,000		5,460,000,000	[1]
Investment in consolidated subsidiaries	0		0	[1]
Equity investments in affiliates	1,183,000,000		1,152,000,000	[1]
Intangible assets, net	1,234,000,000		1,286,000,000	[1]
Derivative Asset, Noncurrent	0		1,000,000
Other non-current assets	56,000,000		65,000,000	[1]
Total other assets	2,473,000,000		2,504,000,000	[1]
Total Assets	8,240,000,000		8,620,000,000	[1]
Current portion of long-term debt — external	300,000,000		291,000,000	[1]
Accounts payable — trade	27,000,000		23,000,000	[1]
Accounts payable — affiliate	45,000,000		40,000,000	[1]
Derivative instruments	23,000,000		32,000,000	[1]
Accrued expenses and other current liabilities	94,000,000		85,000,000	[1]
Current Liabilities	489,000,000		471,000,000	[1]
Other Liabilities
Long-term debt — external	4,914,000,000		5,098,000,000	[1]
Long-term debt — affiliate	618,000,000		618,000,000	[1]
Due to Related Parties, Noncurrent	3,000,000		9,000,000	[1]
Derivative instruments	43,000,000		44,000,000	[1]
Other non-current liabilities	87,000,000		76,000,000	[1]
Total non-current liabilities	5,665,000,000		5,845,000,000	[1]
Total Liabilities	6,154,000,000		6,316,000,000	[1]
Commitments and Contingencies	0		0
Contributed capital	1,897,000,000		2,127,000,000	[1],[2]
Retained earnings	86,000,000		36,000,000	[1],[2]
Noncontrolling interest	181,000,000		226,000,000	[2]
Accumulated other comprehensive loss	(78,000,000)		(85,000,000)	[1],[2]
Stockholders' Equity Attributable to Noncontrolling Interest	181,000,000		226,000,000	[1]
Total Members' Equity	2,086,000,000		2,304,000,000	[1],[2]
Total Liabilities and Members’ Equity	8,240,000,000		8,620,000,000	[1]
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0		0
Restricted cash	0		0
Accounts receivable — trade	3,000,000		2,000,000
Accounts receivable — affiliate	0		0
Inventory	1,000,000		2,000,000
Notes receivable	0		0
Prepayments and other current assets	0		0
Total current assets	4,000,000		4,000,000
Net property, plant and equipment	59,000,000		59,000,000
Investment in consolidated subsidiaries	482,000,000		527,000,000
Equity investments in affiliates	210,000,000		171,000,000
Intangible assets, net	55,000,000		56,000,000
Other non-current assets	0		0
Total other assets	747,000,000		754,000,000
Total Assets	810,000,000		817,000,000
Current portion of long-term debt — external	0		0
Accounts payable — trade	2,000,000		2,000,000
Accounts payable — affiliate	5,000,000		7,000,000
Derivative instruments	0		0
Accrued expenses and other current liabilities	1,000,000		1,000,000
Current Liabilities	8,000,000		10,000,000
Other Liabilities
Long-term debt — external	0		0
Long-term debt — affiliate	0		0
Due to Related Parties, Noncurrent	0		0
Derivative instruments	0		0
Other non-current liabilities	0		0
Total non-current liabilities	0		0
Total Liabilities	8,000,000		10,000,000
Contributed capital	853,000,000		874,000,000
Retained earnings	(49,000,000)		(65,000,000)
Accumulated other comprehensive loss	(2,000,000)		(2,000,000)
Stockholders' Equity Attributable to Noncontrolling Interest	0		0
Total Members' Equity	802,000,000		807,000,000
Total Liabilities and Members’ Equity	810,000,000		817,000,000
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	102,000,000		110,000,000	[1]
Restricted cash	140,000,000		165,000,000	[1]
Accounts receivable — trade	123,000,000		90,000,000	[1]
Accounts receivable — affiliate	0		1,000,000	[1]
Inventory	37,000,000		37,000,000	[1]
Notes receivable	15,000,000		16,000,000	[1]
Prepayments and other current assets	22,000,000		19,000,000	[1]
Total current assets	439,000,000		440,000,000	[1]
Net property, plant and equipment	5,188,000,000		5,401,000,000	[1]
Investment in consolidated subsidiaries	0		0	[1]
Equity investments in affiliates	598,000,000		600,000,000	[1]
Intangible assets, net	1,179,000,000		1,230,000,000	[1]
Other non-current assets	56,000,000		64,000,000	[1]
Total other assets	1,833,000,000		1,895,000,000	[1]
Total Assets	7,460,000,000		7,736,000,000	[1]
Current portion of long-term debt — external	300,000,000		291,000,000	[1]
Accounts payable — trade	25,000,000		18,000,000	[1]
Accounts payable — affiliate	19,000,000		15,000,000	[1]
Derivative instruments	23,000,000		32,000,000	[1]
Accrued expenses and other current liabilities	80,000,000		60,000,000	[1]
Current Liabilities	447,000,000		416,000,000	[1]
Other Liabilities
Long-term debt — external	4,074,000,000		4,259,000,000	[1]
Long-term debt — affiliate	0		0	[1]
Due to Related Parties, Noncurrent	3,000,000		9,000,000	[1]
Derivative instruments	43,000,000		44,000,000	[1]
Other non-current liabilities	79,000,000		76,000,000	[1]
Total non-current liabilities	4,199,000,000		4,388,000,000	[1]
Total Liabilities	4,646,000,000		4,804,000,000	[1]
Contributed capital	2,734,000,000		2,920,000,000	[1]
Retained earnings	100,000,000		35,000,000	[1]
Accumulated other comprehensive loss	(80,000,000)		(87,000,000)	[1]
Stockholders' Equity Attributable to Noncontrolling Interest	60,000,000		64,000,000	[1]
Total Members' Equity	2,814,000,000		2,932,000,000	[1]
Total Liabilities and Members’ Equity	7,460,000,000		7,736,000,000	[1]
NRG Yield LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	76,000,000		211,000,000	[1]
Restricted cash	0		0	[1]
Accounts receivable — trade	0		0	[1]
Accounts receivable — affiliate	1,000,000		0	[1]
Inventory	0		0	[1]
Notes receivable	0		0	[1]
Prepayments and other current assets	0		0	[1]
Total current assets	77,000,000		211,000,000	[1]
Net property, plant and equipment	0		0	[1]
Investment in consolidated subsidiaries	1,828,000,000		1,867,000,000	[1]
Equity investments in affiliates	0		0	[1]
Intangible assets, net	0		0	[1]
Other non-current assets	0		0	[1]
Total other assets	1,828,000,000		1,867,000,000	[1]
Total Assets	1,905,000,000		2,078,000,000	[1]
Current portion of long-term debt — external	0		0	[1]
Accounts payable — trade	0		0	[1]
Accounts payable — affiliate	0		0	[1]
Derivative instruments	0		0	[1]
Accrued expenses and other current liabilities	0		0	[1]
Current Liabilities	0		0	[1]
Other Liabilities
Long-term debt — external	0		0	[1]
Long-term debt — affiliate	0		0	[1]
Due to Related Parties, Noncurrent	0		0	[1]
Derivative instruments	0		0	[1]
Other non-current liabilities	0		0	[1]
Total non-current liabilities	0		0	[1]
Total Liabilities	0		0	[1]
Contributed capital	1,897,000,000		2,127,000,000	[1]
Retained earnings	86,000,000		36,000,000	[1]
Accumulated other comprehensive loss	(78,000,000)		(85,000,000)	[1]
Stockholders' Equity Attributable to Noncontrolling Interest	0		0	[1]
Total Members' Equity	1,905,000,000		2,078,000,000	[1]
Total Liabilities and Members’ Equity	1,905,000,000		2,078,000,000	[1]
NRG Yield Operating LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0		0	[1]
Restricted cash	0		0	[1]
Accounts receivable — trade	0		0	[1]
Accounts receivable — affiliate	0		0	[1]
Inventory	0		0	[1]
Notes receivable	0		0	[1]
Prepayments and other current assets	0		1,000,000	[1]
Total current assets	0		1,000,000	[1]
Net property, plant and equipment	0		0	[1]
Investment in consolidated subsidiaries	3,134,000,000		3,212,000,000	[1]
Equity investments in affiliates	375,000,000		381,000,000	[1]
Intangible assets, net	0		0	[1]
Other non-current assets	0		1,000,000	[1]
Total other assets	3,509,000,000		3,594,000,000	[1]
Total Assets	3,509,000,000		3,595,000,000	[1]
Current portion of long-term debt — external	0		0	[1]
Accounts payable — trade	0		3,000,000	[1]
Accounts payable — affiliate	21,000,000		18,000,000	[1]
Derivative instruments	0		0	[1]
Accrued expenses and other current liabilities	13,000,000		24,000,000	[1]
Current Liabilities	34,000,000		45,000,000	[1]
Other Liabilities
Long-term debt — external	840,000,000		839,000,000	[1]
Long-term debt — affiliate	618,000,000		618,000,000	[1]
Due to Related Parties, Noncurrent	0		0	[1]
Derivative instruments	0		0	[1]
Other non-current liabilities	8,000,000		0	[1]
Total non-current liabilities	1,466,000,000		1,457,000,000	[1]
Total Liabilities	1,500,000,000		1,502,000,000	[1]
Contributed capital	2,077,000,000		2,103,000,000	[1]
Retained earnings	(171,000,000)		(151,000,000)	[1]
Accumulated other comprehensive loss	(78,000,000)		(85,000,000)	[1]
Stockholders' Equity Attributable to Noncontrolling Interest	181,000,000		226,000,000	[1]
Total Members' Equity	2,009,000,000		2,093,000,000	[1]
Total Liabilities and Members’ Equity	3,509,000,000		3,595,000,000	[1]
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents	0	[3]	0	[4]
Restricted cash	0	[3]	0	[4]
Accounts receivable — trade	0	[3]	0	[4]
Accounts receivable — affiliate	0	[3]	0	[4]
Inventory	0	[3]	0	[4]
Notes receivable	0	[3]	0	[4]
Prepayments and other current assets	0	[3]	0	[4]
Total current assets	0	[3]	0	[4]
Net property, plant and equipment	0	[3]	0	[4]
Investment in consolidated subsidiaries	(5,444,000,000)	[3]	(5,606,000,000)	[4]
Equity investments in affiliates	0	[5]	0	[4]
Intangible assets, net	0	[3]	0	[4]
Other non-current assets	0	[3]	0	[4]
Total other assets	(5,444,000,000)	[3]	(5,606,000,000)	[4]
Total Assets	(5,444,000,000)	[3]	(5,606,000,000)	[4]
Current portion of long-term debt — external	0	[3]	0	[4]
Accounts payable — trade	0	[3]	0	[4]
Accounts payable — affiliate	0	[3]	0	[4]
Derivative instruments	0	[3]	0	[4]
Accrued expenses and other current liabilities	0	[3]	0	[4]
Current Liabilities	0	[3]	0	[4]
Other Liabilities
Long-term debt — external	0	[3]	0	[4]
Long-term debt — affiliate	0	[3]	0	[4]
Due to Related Parties, Noncurrent	0	[3]	0	[4]
Derivative instruments	0	[3]	0	[4]
Other non-current liabilities	0	[3]	0	[4]
Total non-current liabilities	0	[3]	0	[4]
Total Liabilities	0	[3]	0	[4]
Contributed capital	(5,664,000,000)	[3]	(5,897,000,000)	[4]
Retained earnings	120,000,000	[3]	181,000,000	[4]
Accumulated other comprehensive loss	160,000,000	[3]	174,000,000	[4]
Stockholders' Equity Attributable to Noncontrolling Interest	(60,000,000)	[3]	(64,000,000)	[4]
Total Members' Equity	(5,444,000,000)	[3]	(5,606,000,000)	[4]
Total Liabilities and Members’ Equity	$ (5,444,000,000)	[3]	$ (5,606,000,000)	[4]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) All significant intercompany transactions have been eliminated in consolidation.
[4]	(b) All significant intercompany transactions have been eliminated in consolidation.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan52

Condensed Consolidating Financial Information CP Cash Flows (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 375	$ 444	[1],[2]
Intercompany transactions between Yield LLC and subsidiaries	0	0	[2]
Payments for the Drop Down Assets	176	77	[1],[2]
Capital expenditures	(23)	(16)	[1],[2]
Cash receipts from notes receivable	11	11	[1],[2]
Return of investment from unconsolidated affiliates	32	16	[1],[2]
Investments in unconsolidated affiliates	(48)	(69)	[1],[2]
Net Cash Used in Investing Activities	(204)	(135)	[1],[2]
Transfer of funds under intercompany cash management arrangement	0	0	[2]
Net contributions from noncontrolling interests	13	7	[2]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(49)	(126)	[1],[2]
Proceeds from Issuance of Class C units	33	0	[1]
Payments of (Proceeds from) distributions	149	127	[2]
Proceeds from the issuance of long-term debt — external	41	550	[1],[2]
Net Cash (Used in) Provided by Financing Activities	(339)	(212)	[1],[2]
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(168)	97	[1],[2]
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	486	241	[1],[2]
Cash, Cash Equivalents and Restricted Cash at End of Period	318	338	[1],[2]
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	38	45
Intercompany transactions between Yield LLC and subsidiaries	0	0
Payments for the Drop Down Assets	0
Capital expenditures	(3)	0
Cash receipts from notes receivable	0	0
Return of investment from unconsolidated affiliates	7	3
Investments in unconsolidated affiliates	(41)	(48)
Net Cash Used in Investing Activities	(37)	(45)
Transfer of funds under intercompany cash management arrangement	(1)	0
Net contributions from noncontrolling interests	0	0
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	0	0
Proceeds from Issuance of Class C units	0
Payments of (Proceeds from) distributions	0	0
Proceeds from the issuance of long-term debt — external	0	0
Net Cash (Used in) Provided by Financing Activities	(1)	0
Net Decrease in Cash, Cash Equivalents and Restricted Cash	0	0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	0	0
Cash, Cash Equivalents and Restricted Cash at End of Period	0	0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	414	365	[2]
Intercompany transactions between Yield LLC and subsidiaries	0	0	[2]
Payments for the Drop Down Assets	0
Capital expenditures	(20)	(16)	[2]
Cash receipts from notes receivable	11	11	[2]
Return of investment from unconsolidated affiliates	9	0	[2]
Investments in unconsolidated affiliates	(7)	0	[2]
Net Cash Used in Investing Activities	(7)	(5)	[2]
Transfer of funds under intercompany cash management arrangement	0	0	[2]
Net contributions from noncontrolling interests	0	0	[2]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(42)	(126)	[2]
Proceeds from Issuance of Class C units	0
Payments of (Proceeds from) distributions	211	204	[2]
Proceeds from the issuance of long-term debt — external	41	200
Net Cash (Used in) Provided by Financing Activities	(440)	(335)	[2]
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(33)	25	[2]
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	275	226	[2]
Cash, Cash Equivalents and Restricted Cash at End of Period	242	251	[2]
NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	0	0	[2]
Intercompany transactions between Yield LLC and subsidiaries	(13)	145	[2]
Payments for the Drop Down Assets	0
Capital expenditures	0	0	[2]
Cash receipts from notes receivable	0	0	[2]
Return of investment from unconsolidated affiliates	0	0	[2]
Investments in unconsolidated affiliates	0	0	[2]
Net Cash Used in Investing Activities	(13)	145	[2]
Transfer of funds under intercompany cash management arrangement	(6)	54	[2]
Net contributions from noncontrolling interests	0	0	[2]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	0	0	[2]
Proceeds from Issuance of Class C units	33
Payments of (Proceeds from) distributions	149	127	[2]
Proceeds from the issuance of long-term debt — external	0	0
Net Cash (Used in) Provided by Financing Activities	(122)	(73)	[2]
Net Decrease in Cash, Cash Equivalents and Restricted Cash	(135)	72	[2]
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	211	15	[2]
Cash, Cash Equivalents and Restricted Cash at End of Period	76	87	[2]
NRG Yield Operating LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(77)	34
Intercompany transactions between Yield LLC and subsidiaries	13	(145)
Payments for the Drop Down Assets	176	77
Capital expenditures	0	0
Cash receipts from notes receivable	0	0
Return of investment from unconsolidated affiliates	16	13
Investments in unconsolidated affiliates	0	(21)
Net Cash Used in Investing Activities	(147)	(230)
Transfer of funds under intercompany cash management arrangement	7	(54)
Net contributions from noncontrolling interests	13	7
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(7)	0
Proceeds from Issuance of Class C units	0
Payments of (Proceeds from) distributions	(211)	(204)
Proceeds from the issuance of long-term debt — external	0	350
Net Cash (Used in) Provided by Financing Activities	224	196
Net Decrease in Cash, Cash Equivalents and Restricted Cash	0	0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period	0	0
Cash, Cash Equivalents and Restricted Cash at End of Period	$ 0	$ 0
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidating Finan53

Condensed Consolidating Financial Information PP Income Statement (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Condensed Income Statements, Captions [Line Items]
Total operating revenues		$ 265		$ 272	[1],[2]	$ 767		$ 789	[1],[2]
Operating Costs and Expenses
Cost of operations		78		76	[1],[2]	239		238	[1],[2]
Depreciation and amortization		88		75	[1],[2]	241		224	[1],[2]
General and administrative		4		3	[1],[2]	14		8	[1],[2]
Business Combination, Acquisition Related Costs		0		0	[2]	2		0	[2]
Total operating costs and expenses		170		154	[1],[2]	496		470	[1],[2]
Operating Income (Loss)		95		118	[1],[2]	271		319	[1],[2]
Equity in earnings (losses) of consolidated affiliates		0		0	[1]	0		0	[1]
Equity in earnings of unconsolidated affiliates		28		16	[1],[2]	63		34	[1],[2],[3]
Other income, net		1		1	[1],[2]	3		3	[1],[2]
Interest expense		72		68	[1],[2]	227		204	[1],[2]
Total other income (expense), net		(43)		(51)	[1],[2]	(161)		(167)	[1],[2]
Net Income (Loss)		52		67	[1],[2]	110		152	[1],[2],[3],[4]
Less: Net loss attributable to noncontrolling interests		(23)		(38)	[1],[2]	(56)		(67)	[1],[2]
Net Income Attributable to NRG Yield LLC		75		105	[1],[2]	166		219	[1],[2]
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		6		7		16		17
Operating Costs and Expenses
Cost of operations		3		3		10		10
Depreciation and amortization		1		2		3		4
General and administrative		0		0		0		0
Business Combination, Acquisition Related Costs						0
Total operating costs and expenses		4		5		13		14
Operating Income (Loss)		2		2		3		3
Equity in earnings (losses) of consolidated affiliates		(4)		4		6		21
Equity in earnings of unconsolidated affiliates		7		(1)		9		7
Other income, net		0		0		0		0
Interest expense		0		0		0		0
Total other income (expense), net		3		3		15		28
Net Income (Loss)		5		5		18		31
Less: Net loss attributable to noncontrolling interests		0		0		0		0
Net Income Attributable to NRG Yield LLC		5		5		18		31
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		259		265	[1]	751		772	[1]
Operating Costs and Expenses
Cost of operations		75		73	[1]	229		228	[1]
Depreciation and amortization		87		73	[1]	238		220	[1]
General and administrative		0		0	[1]	0		0	[1]
Business Combination, Acquisition Related Costs						0
Total operating costs and expenses		162		146	[1]	467		448	[1]
Operating Income (Loss)		97		119	[1]	284		324	[1]
Equity in earnings (losses) of consolidated affiliates		0		0	[1]	0		0	[1]
Equity in earnings of unconsolidated affiliates		6		3	[1]	28		3	[1]
Other income, net		1		1	[1]	2		3	[1]
Interest expense		54		51	[1]	173		156	[1]
Total other income (expense), net		(47)		(47)	[1]	(143)		(150)	[1]
Net Income (Loss)		50		72	[1]	141		174	[1],[4]
Less: Net loss attributable to noncontrolling interests		(1)		(1)	[1]	(3)		(1)	[1]
Net Income Attributable to NRG Yield LLC		51		73	[1]	144		175	[1]
NRG Yield LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0	[1]	0		0	[1]
Operating Costs and Expenses
Cost of operations		0		0	[1]	0		0	[1]
Depreciation and amortization		0		0	[1]	0		0	[1]
General and administrative		0		0	[1]	0		0	[1]
Business Combination, Acquisition Related Costs						0
Total operating costs and expenses		0		0	[1]	0		0	[1]
Operating Income (Loss)		0		0	[1]	0		0	[1]
Equity in earnings (losses) of consolidated affiliates		75		105	[1]	165		219	[1]
Equity in earnings of unconsolidated affiliates		0		0	[1]	0		0	[1]
Other income, net		0		0	[1]	1		0	[1]
Interest expense		0		0	[1]	0		0	[1]
Total other income (expense), net		75		105	[1]	166		219	[1]
Net Income (Loss)		75		105	[1],[4]	166		219	[1],[4]
Less: Net loss attributable to noncontrolling interests		0		0	[1]	0		0	[1]
Net Income Attributable to NRG Yield LLC		75		105	[1]	166		219	[1]
NRG Yield Operating LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0	[1]	1		0	[1]
Operating Costs and Expenses
Cost of operations		0		0	[1]	1		0	[1]
Depreciation and amortization		0		0	[1]	0		0	[1]
General and administrative		4		3	[1]	14		8	[1]
Business Combination, Acquisition Related Costs						2
Total operating costs and expenses		4		3	[1]	17		8	[1]
Operating Income (Loss)		(4)		(3)	[1]	(16)		(8)	[1]
Equity in earnings (losses) of consolidated affiliates		59		73	[1]	153		184	[1]
Equity in earnings of unconsolidated affiliates		15		14	[1]	26		24	[1]
Other income, net		0		0	[1]	0		0	[1]
Interest expense		18		17	[1]	54		48	[1]
Total other income (expense), net		56		70	[1]	125		160	[1]
Net Income (Loss)		52		67	[1],[4]	109		152	[1],[4]
Less: Net loss attributable to noncontrolling interests		(23)		(38)	[1]	(56)		(67)	[1]
Net Income Attributable to NRG Yield LLC		75		105	[1]	165		219	[1]
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0	[5]	0	[6]	(1)	[5]	0	[6]
Operating Costs and Expenses
Cost of operations		0	[5]	0	[6]	(1)	[5]	0	[6]
Depreciation and amortization		0	[5]	0	[6]	0	[5]	0	[6]
General and administrative		0	[5]	0	[6]	0	[5]	0	[6]
Business Combination, Acquisition Related Costs	[5]					0
Total operating costs and expenses		0	[5]	0	[6]	(1)	[5]	0	[6]
Operating Income (Loss)		0	[5]	0	[6]	0	[5]	0	[6]
Equity in earnings (losses) of consolidated affiliates		(130)	[5]	(182)	[6]	(324)	[5]	(424)	[6]
Equity in earnings of unconsolidated affiliates		0	[5]	0	[6]	0	[5]	0	[6]
Other income, net		0	[5]	0	[6]	0	[5]	0	[6]
Interest expense		0	[5]	0	[6]	0	[5]	0	[6]
Total other income (expense), net		(130)	[5]	(182)	[6]	(324)	[5]	(424)	[6]
Net Income (Loss)		(130)	[5]	(182)	[6]	(324)	[5]	(424)	[6],[7]
Less: Net loss attributable to noncontrolling interests		1	[5]	1	[6]	3	[5]	1	[6]
Net Income Attributable to NRG Yield LLC		$ (131)	[5]	$ (183)	[6]	$ (327)	[5]	$ (425)	[6]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan54

Condensed Consolidating Financial Information PP Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2017		Sep. 30, 2016		Sep. 30, 2017		Sep. 30, 2016
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	$ 52		$ 67	[1],[2]	$ 110		$ 152	[1],[2],[3],[4]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		20	[4],[5]	7		(49)	[4],[5]
Other Comprehensive Income (Loss), Net of Tax	7		20	[4],[5]	7		(49)	[4],[5]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	59		87	[4],[5]	117		103	[4],[5]
Less: Comprehensive loss attributable to noncontrolling interests	(23)		(30)	[4],[5]	(56)		(67)	[4],[5]
Comprehensive Income Attributable to NRG Yield LLC	82		117	[4],[5]	173		170	[4],[5]
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	5		5		18		31
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0		0		0		0
Other Comprehensive Income (Loss), Net of Tax	0		0		0		0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	5		5		18		31
Less: Comprehensive loss attributable to noncontrolling interests	0		0		0		0
Comprehensive Income Attributable to NRG Yield LLC	5		5		18		31
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	50		72	[1]	141		174	[1],[4]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		19	[4]	7		(45)	[4]
Other Comprehensive Income (Loss), Net of Tax	7		19	[4]	7		(45)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	57		91	[4]	148		129	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(1)		(1)	[4]	(3)		(1)	[4]
Comprehensive Income Attributable to NRG Yield LLC	58		92	[4]	151		130	[4]
NRG Yield LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	75		105	[1],[4]	166		219	[1],[4]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		11	[4]	7		(49)	[4]
Other Comprehensive Income (Loss), Net of Tax	7		11	[4]	7		(49)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	82		116	[4]	173		170	[4]
Less: Comprehensive loss attributable to noncontrolling interests	0		0	[4]	0		0	[4]
Comprehensive Income Attributable to NRG Yield LLC	82		116	[4]	173		170	[4]
NRG Yield Operating LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	52		67	[1],[4]	109		152	[1],[4]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		20	[4]	7		(49)	[4]
Other Comprehensive Income (Loss), Net of Tax	7		20	[4]	7		(49)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	59		87	[4]	116		103	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(23)		(30)	[4]	(56)		(67)	[4]
Comprehensive Income Attributable to NRG Yield LLC	82		117	[4]	172		170	[4]
Consolidation, Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(130)	[6]	(182)	[7]	(324)	[6]	(424)	[7],[8]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(14)	[6]	(30)	[8]	(14)	[6]	94	[8]
Other Comprehensive Income (Loss), Net of Tax	(14)	[6]	(30)	[8]	(14)	[6]	94	[8]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(144)	[6]	(212)	[8]	(338)	[6]	(330)	[8]
Less: Comprehensive loss attributable to noncontrolling interests	1	[9]	1	[8]	3	[9]	1	[8]
Comprehensive Income Attributable to NRG Yield LLC	$ (145)	[9]	$ (213)	[8]	$ (341)	[9]	$ (331)	[8]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) All significant intercompany transactions have been eliminated in consolidation.
[7]	(b) All significant intercompany transactions have been eliminated in consolidation.
[8]	(b) All significant intercompany transactions have been eliminated in consolidation.
[9]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan55

Condensed Consolidating Financial Information PP Balance Sheet (Details) - USD ($)		Sep. 30, 2017		Dec. 31, 2016
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		$ 178,000,000		$ 321,000,000	[1]
Restricted cash		140,000,000		165,000,000	[1]
Accounts receivable — trade		126,000,000		92,000,000	[1]
Accounts receivable — affiliate		1,000,000		1,000,000	[1]
Inventory		38,000,000		39,000,000	[1]
Notes receivable		15,000,000		16,000,000	[1]
Prepayments and other current assets		22,000,000		20,000,000	[1]
Total current assets		520,000,000		656,000,000	[1]
Net property, plant and equipment		5,247,000,000		5,460,000,000	[1]
Investment in consolidated subsidiaries		0		0	[1]
Equity investments in affiliates		1,183,000,000		1,152,000,000	[1]
Intangible assets, net		1,234,000,000		1,286,000,000	[1]
Derivative Instruments and Hedges, Noncurrent	[1]			1,000,000
Other non-current assets		56,000,000		65,000,000	[1]
Total other assets		2,473,000,000		2,504,000,000	[1]
Total Assets		8,240,000,000		8,620,000,000	[1]
Current portion of long-term debt — external		300,000,000		291,000,000	[1]
Accounts payable — trade		27,000,000		23,000,000	[1]
Accounts payable — affiliate		45,000,000		40,000,000	[1]
Derivative instruments		23,000,000		32,000,000	[1]
Accrued expenses and other current liabilities		94,000,000		85,000,000	[1]
Current Liabilities		489,000,000		471,000,000	[1]
Other Liabilities
Long-term debt — external		4,914,000,000		5,098,000,000	[1]
Long-term debt — affiliate		618,000,000		618,000,000	[1]
Due to Related Parties, Noncurrent		3,000,000		9,000,000	[1]
Derivative instruments		43,000,000		44,000,000	[1]
Other non-current liabilities		87,000,000		76,000,000	[1]
Total non-current liabilities		5,665,000,000		5,845,000,000	[1]
Total Liabilities		6,154,000,000		6,316,000,000	[1]
Commitments and Contingencies		0		0
Contributed capital		1,897,000,000		2,127,000,000	[1],[2]
Retained earnings		86,000,000		36,000,000	[1],[2]
Accumulated other comprehensive loss		(78,000,000)		(85,000,000)	[1],[2]
Noncontrolling interest		181,000,000		226,000,000	[1]
Total Members' Equity		2,086,000,000		2,304,000,000	[1],[2]
Total Liabilities and Members’ Equity		8,240,000,000		8,620,000,000	[1]
Derivative Instruments and Hedges, Assets	[1]			2,000,000
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0		0
Restricted cash		0		0
Accounts receivable — trade		3,000,000		2,000,000
Accounts receivable — affiliate		0		0
Inventory		1,000,000		2,000,000
Notes receivable		0		0
Prepayments and other current assets		0		0
Total current assets		4,000,000		4,000,000
Net property, plant and equipment		59,000,000		59,000,000
Investment in consolidated subsidiaries		482,000,000		527,000,000
Equity investments in affiliates		210,000,000		171,000,000
Intangible assets, net		55,000,000		56,000,000
Derivative Instruments and Hedges, Noncurrent				0
Other non-current assets		0		0
Total other assets		747,000,000		754,000,000
Total Assets		810,000,000		817,000,000
Current portion of long-term debt — external		0		0
Accounts payable — trade		2,000,000		2,000,000
Accounts payable — affiliate		5,000,000		7,000,000
Derivative instruments		0		0
Accrued expenses and other current liabilities		1,000,000		1,000,000
Current Liabilities		8,000,000		10,000,000
Other Liabilities
Long-term debt — external		0		0
Long-term debt — affiliate		0		0
Due to Related Parties, Noncurrent		0		0
Derivative instruments		0		0
Other non-current liabilities		0		0
Total non-current liabilities		0		0
Total Liabilities		8,000,000		10,000,000
Contributed capital		853,000,000		874,000,000
Retained earnings		(49,000,000)		(65,000,000)
Accumulated other comprehensive loss		(2,000,000)		(2,000,000)
Noncontrolling interest		0		0
Total Members' Equity		802,000,000		807,000,000
Total Liabilities and Members’ Equity		810,000,000		817,000,000
Derivative Instruments and Hedges, Assets				0
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		102,000,000		110,000,000	[1]
Restricted cash		140,000,000		165,000,000	[1]
Accounts receivable — trade		123,000,000		90,000,000	[1]
Accounts receivable — affiliate		0		1,000,000	[1]
Inventory		37,000,000		37,000,000	[1]
Notes receivable		15,000,000		16,000,000	[1]
Prepayments and other current assets		22,000,000		19,000,000	[1]
Total current assets		439,000,000		440,000,000	[1]
Net property, plant and equipment		5,188,000,000		5,401,000,000	[1]
Investment in consolidated subsidiaries		0		0	[1]
Equity investments in affiliates		598,000,000		600,000,000	[1]
Intangible assets, net		1,179,000,000		1,230,000,000	[1]
Derivative Instruments and Hedges, Noncurrent	[1]			1,000,000
Other non-current assets		56,000,000		64,000,000	[1]
Total other assets		1,833,000,000		1,895,000,000	[1]
Total Assets		7,460,000,000		7,736,000,000	[1]
Current portion of long-term debt — external		300,000,000		291,000,000	[1]
Accounts payable — trade		25,000,000		18,000,000	[1]
Accounts payable — affiliate		19,000,000		15,000,000	[1]
Derivative instruments		23,000,000		32,000,000	[1]
Accrued expenses and other current liabilities		80,000,000		60,000,000	[1]
Current Liabilities		447,000,000		416,000,000	[1]
Other Liabilities
Long-term debt — external		4,074,000,000		4,259,000,000	[1]
Long-term debt — affiliate		0		0	[1]
Due to Related Parties, Noncurrent		3,000,000		9,000,000	[1]
Derivative instruments		43,000,000		44,000,000	[1]
Other non-current liabilities		79,000,000		76,000,000	[1]
Total non-current liabilities		4,199,000,000		4,388,000,000	[1]
Total Liabilities		4,646,000,000		4,804,000,000	[1]
Contributed capital		2,734,000,000		2,920,000,000	[1]
Retained earnings		100,000,000		35,000,000	[1]
Accumulated other comprehensive loss		(80,000,000)		(87,000,000)	[1]
Noncontrolling interest		60,000,000		64,000,000	[1]
Total Members' Equity		2,814,000,000		2,932,000,000	[1]
Total Liabilities and Members’ Equity		7,460,000,000		7,736,000,000	[1]
Derivative Instruments and Hedges, Assets	[1]			2,000,000
NRG Yield LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		76,000,000		211,000,000	[1]
Restricted cash		0		0	[1]
Accounts receivable — trade		0		0	[1]
Accounts receivable — affiliate		1,000,000		0	[1]
Inventory		0		0	[1]
Notes receivable		0		0	[1]
Prepayments and other current assets		0		0	[1]
Total current assets		77,000,000		211,000,000	[1]
Net property, plant and equipment		0		0	[1]
Investment in consolidated subsidiaries		1,828,000,000		1,867,000,000	[1]
Equity investments in affiliates		0		0	[1]
Intangible assets, net		0		0	[1]
Derivative Instruments and Hedges, Noncurrent	[1]			0
Other non-current assets		0		0	[1]
Total other assets		1,828,000,000		1,867,000,000	[1]
Total Assets		1,905,000,000		2,078,000,000	[1]
Current portion of long-term debt — external		0		0	[1]
Accounts payable — trade		0		0	[1]
Accounts payable — affiliate		0		0	[1]
Derivative instruments		0		0	[1]
Accrued expenses and other current liabilities		0		0	[1]
Current Liabilities		0		0	[1]
Other Liabilities
Long-term debt — external		0		0	[1]
Long-term debt — affiliate		0		0	[1]
Due to Related Parties, Noncurrent		0		0	[1]
Derivative instruments		0		0	[1]
Other non-current liabilities		0		0	[1]
Total non-current liabilities		0		0	[1]
Total Liabilities		0		0	[1]
Contributed capital		1,897,000,000		2,127,000,000	[1]
Retained earnings		86,000,000		36,000,000	[1]
Accumulated other comprehensive loss		(78,000,000)		(85,000,000)	[1]
Noncontrolling interest		0		0	[1]
Total Members' Equity		1,905,000,000		2,078,000,000	[1]
Total Liabilities and Members’ Equity		1,905,000,000		2,078,000,000	[1]
Derivative Instruments and Hedges, Assets	[1]			0
NRG Yield Operating LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0		0	[1]
Restricted cash		0		0	[1]
Accounts receivable — trade		0		0	[1]
Accounts receivable — affiliate		0		0	[1]
Inventory		0		0	[1]
Notes receivable		0		0	[1]
Prepayments and other current assets		0		1,000,000	[1]
Total current assets		0		1,000,000	[1]
Net property, plant and equipment		0		0	[1]
Investment in consolidated subsidiaries		3,134,000,000		3,212,000,000	[1]
Equity investments in affiliates		375,000,000		381,000,000	[1]
Intangible assets, net		0		0	[1]
Derivative Instruments and Hedges, Noncurrent	[1]			0
Other non-current assets		0		1,000,000	[1]
Total other assets		3,509,000,000		3,594,000,000	[1]
Total Assets		3,509,000,000		3,595,000,000	[1]
Current portion of long-term debt — external		0		0	[1]
Accounts payable — trade		0		3,000,000	[1]
Accounts payable — affiliate		21,000,000		18,000,000	[1]
Derivative instruments		0		0	[1]
Accrued expenses and other current liabilities		13,000,000		24,000,000	[1]
Current Liabilities		34,000,000		45,000,000	[1]
Other Liabilities
Long-term debt — external		840,000,000		839,000,000	[1]
Long-term debt — affiliate		618,000,000		618,000,000	[1]
Due to Related Parties, Noncurrent		0		0	[1]
Derivative instruments		0		0	[1]
Other non-current liabilities		8,000,000		0	[1]
Total non-current liabilities		1,466,000,000		1,457,000,000	[1]
Total Liabilities		1,500,000,000		1,502,000,000	[1]
Contributed capital		2,077,000,000		2,103,000,000	[1]
Retained earnings		(171,000,000)		(151,000,000)	[1]
Accumulated other comprehensive loss		(78,000,000)		(85,000,000)	[1]
Noncontrolling interest		181,000,000		226,000,000	[1]
Total Members' Equity		2,009,000,000		2,093,000,000	[1]
Total Liabilities and Members’ Equity		3,509,000,000		3,595,000,000	[1]
Derivative Instruments and Hedges, Assets	[1]			0
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0	[3]	0	[4]
Restricted cash		0	[3]	0	[4]
Accounts receivable — trade		0	[3]	0	[4]
Accounts receivable — affiliate		0	[3]	0	[4]
Inventory		0	[3]	0	[4]
Notes receivable		0	[3]	0	[4]
Prepayments and other current assets		0	[3]	0	[4]
Total current assets		0	[3]	0	[4]
Net property, plant and equipment		0	[3]	0	[4]
Investment in consolidated subsidiaries		(5,444,000,000)	[3]	(5,606,000,000)	[4]
Equity investments in affiliates		0	[5]	0	[4]
Intangible assets, net		0	[3]	0	[4]
Derivative Instruments and Hedges, Noncurrent	[4]			0
Other non-current assets		0	[3]	0	[4]
Total other assets		(5,444,000,000)	[3]	(5,606,000,000)	[4]
Total Assets		(5,444,000,000)	[3]	(5,606,000,000)	[4]
Current portion of long-term debt — external		0	[3]	0	[4]
Accounts payable — trade		0	[3]	0	[4]
Accounts payable — affiliate		0	[3]	0	[4]
Derivative instruments		0	[3]	0	[4]
Accrued expenses and other current liabilities		0	[3]	0	[4]
Current Liabilities		0	[3]	0	[4]
Other Liabilities
Long-term debt — external		0	[3]	0	[4]
Long-term debt — affiliate		0	[3]	0	[4]
Due to Related Parties, Noncurrent		0	[3]	0	[4]
Derivative instruments		0	[3]	0	[4]
Other non-current liabilities		0	[3]	0	[4]
Total non-current liabilities		0	[3]	0	[4]
Total Liabilities		0	[3]	0	[4]
Contributed capital		(5,664,000,000)	[3]	(5,897,000,000)	[4]
Retained earnings		120,000,000	[3]	181,000,000	[4]
Accumulated other comprehensive loss		160,000,000	[3]	174,000,000	[4]
Noncontrolling interest		(60,000,000)	[3]	(64,000,000)	[4]
Total Members' Equity		(5,444,000,000)	[3]	(5,606,000,000)	[4]
Total Liabilities and Members’ Equity		$ (5,444,000,000)	[3]	(5,606,000,000)	[4]
Derivative Instruments and Hedges, Assets	[4]			$ 0
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) All significant intercompany transactions have been eliminated in consolidation.
[4]	(b) All significant intercompany transactions have been eliminated in consolidation.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan56

Condensed Consolidating Financial Information PP Cash Flows (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2017	Sep. 30, 2016
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the Drop Down Assets		$ 176	$ 77	[1],[2]
Net Cash Provided by (Used in) Operating Activities		375	444	[1],[2]
Payments for the revolving credit facility		0	366	[1],[2]
Net contributions from noncontrolling interests		13	7	[2]
Intercompany transactions between Yield LLC and subsidiaries		0	0	[2]
Capital expenditures		(23)	(16)	[1],[2]
Cash receipts from notes receivable		11	11	[1],[2]
Return of investment from unconsolidated affiliates		32	16	[1],[2]
Investments in unconsolidated affiliates		(48)	(69)	[1],[2]
Net Cash Used in Investing Activities		(204)	(135)	[1],[2]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets		(49)	(126)	[1],[2]
Proceeds from the issuance of Class C units		33	0	[1]
Transfer of funds under intercompany cash management arrangement		0	0	[2]
Payments of distributions		(149)	(127)	[1]
Proceeds from the issuance of long-term debt — external		41	550	[1],[2]
Payments of debt issuance costs		(4)	(6)	[1],[2]
Proceeds from the revolving credit facility		0	60	[1],[2]
Payments for long-term debt		(224)	(204)	[1],[2]
Net Cash (Used in) Provided by Financing Activities		(339)	(212)	[1],[2]
Net Decrease in Cash, Cash Equivalents and Restricted Cash		(168)	97	[1],[2]
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		486	241	[1],[2]
Cash, Cash Equivalents and Restricted Cash at End of Period		318	338	[1],[2]
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the Drop Down Assets		0
Net Cash Provided by (Used in) Operating Activities		38	45
Payments for the revolving credit facility			0
Net contributions from noncontrolling interests		0	0
Intercompany transactions between Yield LLC and subsidiaries		0	0
Capital expenditures		(3)	0
Cash receipts from notes receivable		0	0
Return of investment from unconsolidated affiliates		7	3
Investments in unconsolidated affiliates		(41)	(48)
Net Cash Used in Investing Activities		(37)	(45)
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets		0	0
Proceeds from the issuance of Class C units		0
Transfer of funds under intercompany cash management arrangement		(1)	0
Proceeds from the issuance of long-term debt — external		0	0
Payments of debt issuance costs		0	0
Proceeds from the revolving credit facility			0
Payments for long-term debt		0	0
Net Cash (Used in) Provided by Financing Activities		(1)	0
Net Decrease in Cash, Cash Equivalents and Restricted Cash		0	0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		0	0
Cash, Cash Equivalents and Restricted Cash at End of Period		0	0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the Drop Down Assets		0
Net Cash Provided by (Used in) Operating Activities		414	365	[2]
Payments for the revolving credit facility	[2]		0
Net contributions from noncontrolling interests		0	0	[2]
Intercompany transactions between Yield LLC and subsidiaries		0	0	[2]
Capital expenditures		(20)	(16)	[2]
Cash receipts from notes receivable		11	11	[2]
Return of investment from unconsolidated affiliates		9	0	[2]
Investments in unconsolidated affiliates		(7)	0	[2]
Net Cash Used in Investing Activities		(7)	(5)	[2]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets		(42)	(126)	[2]
Proceeds from the issuance of Class C units		0
Transfer of funds under intercompany cash management arrangement		0	0	[2]
Proceeds from the issuance of long-term debt — external		41	200
Payments of debt issuance costs		(4)	(1)
Proceeds from the revolving credit facility	[2]		0
Payments for long-term debt		(224)	(204)	[2]
Net Cash (Used in) Provided by Financing Activities		(440)	(335)	[2]
Net Decrease in Cash, Cash Equivalents and Restricted Cash		(33)	25	[2]
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		275	226	[2]
Cash, Cash Equivalents and Restricted Cash at End of Period		242	251	[2]
NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the Drop Down Assets		0
Net Cash Provided by (Used in) Operating Activities		0	0	[2]
Payments for the revolving credit facility	[2]		0
Net contributions from noncontrolling interests		0	0	[2]
Intercompany transactions between Yield LLC and subsidiaries		(13)	145	[2]
Capital expenditures		0	0	[2]
Cash receipts from notes receivable		0	0	[2]
Return of investment from unconsolidated affiliates		0	0	[2]
Investments in unconsolidated affiliates		0	0	[2]
Net Cash Used in Investing Activities		(13)	145	[2]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets		0	0	[2]
Proceeds from the issuance of Class C units		33
Transfer of funds under intercompany cash management arrangement		(6)	54	[2]
Proceeds from the issuance of long-term debt — external		0	0
Payments of debt issuance costs		0	0
Proceeds from the revolving credit facility	[2]		0
Payments for long-term debt		0	0	[2]
Net Cash (Used in) Provided by Financing Activities		(122)	(73)	[2]
Net Decrease in Cash, Cash Equivalents and Restricted Cash		(135)	72	[2]
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		211	15	[2]
Cash, Cash Equivalents and Restricted Cash at End of Period		76	87	[2]
NRG Yield Operating LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the Drop Down Assets		176	77
Net Cash Provided by (Used in) Operating Activities		(77)	34
Payments for the revolving credit facility			366
Net contributions from noncontrolling interests		13	7
Intercompany transactions between Yield LLC and subsidiaries		13	(145)
Capital expenditures		0	0
Cash receipts from notes receivable		0	0
Return of investment from unconsolidated affiliates		16	13
Investments in unconsolidated affiliates		0	(21)
Net Cash Used in Investing Activities		(147)	(230)
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets		(7)	0
Proceeds from the issuance of Class C units		0
Transfer of funds under intercompany cash management arrangement		7	(54)
Proceeds from the issuance of long-term debt — external		0	350
Payments of debt issuance costs		0	(5)
Proceeds from the revolving credit facility			60
Payments for long-term debt		0	0
Net Cash (Used in) Provided by Financing Activities		224	196
Net Decrease in Cash, Cash Equivalents and Restricted Cash		0	0
Cash, Cash Equivalents and Restricted Cash at Beginning of Period		0	0
Cash, Cash Equivalents and Restricted Cash at End of Period		$ 0	0
Drop Down Assets [Member] | Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the Drop Down Assets			0
Drop Down Assets [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the Drop Down Assets			0
Drop Down Assets [Member] | NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the Drop Down Assets			$ 0
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.