Clearway Energy (CWEN.A) 10-Q 2 May 17 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2017	Apr. 30, 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	Mar. 31, 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	2,016
Document Fiscal Period Focus	Q1
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		63,213,831
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
		Mar. 31, 2017		Mar. 31, 2016
Operating Revenues
Total operating revenues		$ 218		$ 234	[1],[2]
Operating Costs and Expenses [Abstract]
Cost of operations		84		85	[1]
Depreciation and amortization		75		74	[1],[2]
General and administrative		4		2	[1],[2]
Acquisition-related transaction and integration costs		1		0	[1]
Total operating costs and expenses		164		161	[1]
Operating Income		54		73	[2]
Costs and Expenses [Abstract]
Equity in earnings of unconsolidated affiliates		19		4	[1],[2],[3]
Other income, net		1		0	[1]
Interest expense		(73)		(71)	[1],[2]
Total other expense, net		(53)		(67)	[1]
Net Income		1		6	[1],[2],[3]
Less: Net loss attributable to noncontrolling interests		(9)		(11)	[1]
Net Income Attributable to NRG Yield LLC		10		17	[1]
Consolidation, Eliminations [Member]
Operating Revenues
Total operating revenues		0	[4]	0	[5]
Operating Costs and Expenses [Abstract]
Cost of operations		0	[4]	0	[5]
Depreciation and amortization		0	[4]	0	[5]
General and administrative		0	[4]	0	[5]
Acquisition-related transaction and integration costs	[4]	0
Total operating costs and expenses		0	[4]	0	[5]
Operating Income		0	[4]	0	[5]
Costs and Expenses [Abstract]
Equity in earnings of unconsolidated affiliates		0	[4]	0	[5]
Other income, net	[4]	0
Interest expense		0	[4]	0	[5]
Total other expense, net		(22)	[4]	(31)	[5]
Net Income		(22)		(31)	[5]
Less: Net loss attributable to noncontrolling interests		1	[4]	0	[5]
Net Income Attributable to NRG Yield LLC		$ (23)	[4]	$ (31)	[5]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	All significant intercompany transactions have been eliminated in consolidation.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.

Consolidated Statements of Comp

Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Net Income	$ 1	$ 6	[1],[2],[3]
Other Comprehensive Loss, net of tax
Unrealized gain (loss) on derivatives	7	(50)	[4]
Other comprehensive income (loss)	7	(50)	[4]
Comprehensive Income (Loss)	8	(44)	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(9)	(12)	[4]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	$ 17	$ (32)	[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]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Current Assets
Cash and cash equivalents	$ 210,000,000	$ 321,000,000	[1]
Restricted cash	106,000,000	165,000,000	[1]
Accounts receivable — trade	82,000,000	92,000,000	[1]
Accounts receivable — affiliate	3,000,000	1,000,000	[1]
Inventory	40,000,000	39,000,000	[1]
Notes receivable	15,000,000	16,000,000	[1]
Derivative instruments — affiliate	1,000,000	2,000,000	[1]
Prepayments and other current assets	19,000,000	20,000,000	[1]
Total current assets	476,000,000	656,000,000	[1]
Property, plant and equipment
Less accumulated depreciation	(1,025,000,000)	(951,000,000)
Property, plant and equipment, net	5,390,000,000	5,460,000,000	[1]
Other Assets
Equity investments in affiliates	1,154,000,000	1,152,000,000	[1]
Notes receivable	10,000,000	14,000,000	[1]
Intangible assets, net	1,268,000,000	1,286,000,000	[1]
Derivative instruments	2,000,000	1,000,000
Other non-current assets	66,000,000	51,000,000	[1]
Total other assets	2,500,000,000	2,504,000,000	[1]
Total Assets	8,366,000,000	8,620,000,000	[1]
Current Liabilities
Current portion of long-term debt — external	296,000,000	291,000,000	[1]
Accounts payable — trade	26,000,000	23,000,000	[1]
Accounts payable — affiliate	50,000,000	40,000,000	[1]
Derivative instruments	28,000,000	32,000,000	[1]
Accrued expenses and other current liabilities	54,000,000	85,000,000	[1]
Total current liabilities	454,000,000	471,000,000	[1]
Other Liabilities
Long-term debt — external	5,061,000,000	5,098,000,000	[1]
Long-term debt — affiliate	618,000,000	618,000,000	[1]
Due to Related Parties, Noncurrent	6,000,000	9,000,000	[1]
Derivative instruments	40,000,000	44,000,000	[1]
Other non-current liabilities	79,000,000	76,000,000	[1]
Total non-current liabilities	5,804,000,000	5,845,000,000	[1]
Total Liabilities	6,258,000,000	6,316,000,000	[1]
Commitments and Contingencies	0	0
Members' Equity
Contributed capital	1,865,000,000	1,995,000,000	[1]
Retained earnings	6,000,000	79,000,000	[1]
Accumulated other comprehensive loss	(76,000,000)	(83,000,000)	[1]
Noncontrolling interest	313,000,000	313,000,000	[1]
Total Members' Equity	2,108,000,000	2,304,000,000	[1]
Total Liabilities and Members’ Equity	$ 8,366,000,000	$ 8,620,000,000	[1]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Consolidated Statements Of Cas

Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Cash Flows from Operating Activities
Net Income	$ 1		$ 6	[1],[2],[3]
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Income (Loss) from Equity Method Investments	19		4	[1],[2],[3]
Distributions from unconsolidated affiliates	13		7	[2]
Depreciation, Amortization and Accretion, Net	75		74	[2]
Amortization of financing costs	2		2	[2]
Amortization of Intangibles and Out of Market Contracts	17		23	[2]
Changes in derivative instruments	(3)		3	[2]
Disposal of asset components and ARO accretion	(3)		0	[2]
Changes in prepaid and accrued capacity payments	36		37	[2]
Changes in other working capital	8		15	[2]
Net Cash Provided by Operating Activities	61		89	[2]
Cash Flows from Investing Activities
Payment to Acquire Business under Common Control	131		0	[2]
Capital expenditures	(4)		(7)	[2]
Decrease in restricted cash	(59)		(23)	[2]
Cash receipts from notes receivable	4		4	[2]
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	16		8	[2]
Investments in unconsolidated affiliates	(7)		(51)	[2]
Other	0		(2)	[2]
Net Cash Provided by (Used in) Investing Activities	(63)		(21)	[2]
Cash Flows from Financing Activities
Net contributions from noncontrolling interests	14		10	[2]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(38)		(11)	[2]
Proceeds from the issuance of Class C units	5		0
Payments of distributions	(53)		(45)	[2]
Payments of Debt Issuance Costs	(3)		0	[2]
Proceeds from Lines of Credit	0		50	[2]
Payments for the revolving credit facility	0		40
Proceeds from the issuance of long-term debt — external	41		0	[2]
Repayments of Long-term Debt	(75)		(67)
Net Cash Used in Financing Activities	(109)		(103)	[2]
Net Decrease in Cash and Cash Equivalents	(111)		(35)	[2]
Cash and Cash Equivalents at Beginning of Period	321	[4]	$ 110	[2]
Cash and Cash Equivalents at End of Period	$ 210
[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]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Nature of Business

Nature of Business	3 Months Ended
	Mar. 31, 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 4,879 net MW as of March 31, 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 March 31, 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 March 31, 2017 : As of March 31, 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 (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) 74.3 % 16 Corn Belt Power Cooperative 2027 Elbow Creek (b) (f) 75 % 92 NRG Power Marketing LLC 2022 Elkhorn Ridge (b) (f) 50.3 % 41 Nebraska Public Power District 2029 Forward (b) (f) 75 % 22 Constellation NewEnergy, Inc. 2017 Goat Wind (b) (f) 74.9 % 113 Dow Pipeline Company 2025 Hardin (b) (f) 74.3 % 11 Interstate Power and Light Company 2027 Laredo Ridge 100 % 80 Nebraska Public Power District 2031 Lookout (b) (f) 75 % 29 Southern Maryland Electric Cooperative 2030 Odin (b) (f) 74.9 % 15 Missouri River Energy Services 2028 Pinnacle 100 % 55 Maryland Department of General Services and University System of Maryland 2031 San Juan Mesa (b) (f) 56.3 % 68 Southwestern Public Service Company 2025 Sleeping Bear (b) (f) 75 % 71 Public Service Company of Oklahoma 2032 South Trent 100 % 101 AEP Energy Partners 2029 Spanish Fork (b) (f) 75 % 14 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) 74.9 % 121 Southwestern Public Service Company 2027 Projects Percentage Ownership Net Capacity (MW) (a) Offtake Counterparty Expiration 1,999 Thermal Thermal equivalent MWt (c) 100 % 1,319 Various Various NRG Dover Energy Center LLC 100 % 103 NRG Power Marketing LLC 2018 Thermal generation 100 % 20 Various Various 1,442 Total net capacity (excluding equivalent MWt) (d) 5,002 (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 March 31, 2017 . (b) Projects are part of tax equity arrangements . (c) 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. (d) 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 5,008 MWs. (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 151 MW based on cash to be distributed. For further discussions, refer to Note 3, Investments Accounted for by the Equity Method and Variable Interest Entities to the Consolidated Financial Statements. 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 further described in Note 3 , Investments Accounted for by the Equity Method and Variable Interest Entities , 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 NRG 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 $1 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 acquisition of the March 2017 Drop Down Assets was accounted for as 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 Aqua Caliente Borrower 2 LLC on January 1, 2016, and its interests in the Utah Solar Portfolio on November 2, 2016. In addition, the Company's results of operations for the three months ended March 31, 2016 were recast for the Company's acquisition of the CVSR Drop Down Asset on September 1, 2016; refer to Note 3, Business Acquisitions, in the Company's 2016 Report on Form 10-K for additional information. 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 Company's audited consolidated financial statements for the year ended December 31, 2016 included in the 2016 Form 10-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 March 31, 2017 , and the results of operations, comprehensive income (loss) and cash flows for the three months ended March 31, 2017 and 2016 .

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 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 March 31, 2017 and December 31, 2016: March 31, 2017 December 31, 2016 (In millions) Property, Plant and Equipment Accumulated Depreciation $ 1,025 $ 951 Intangible Assets Accumulated Amortization 181 163 Noncontrolling Interests The following table reflects the changes in the Company's noncontrolling interest balance: (In millions) Balance as of December 31, 2016 313 Capital contributions from tax equity investors, net of distributions 14 Comprehensive income (9 ) Distributions to NRG for its 25% interest in TE Holdco (5 ) Balance as of March 31, 2017 $ 313 Distributions The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the three months ended March 31, 2017 : First Quarter 2017 Distributions per Class A, B, C and D unit $ 0.26 On April 25, 2017 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.27 per unit payable on June 15, 2017 to unit holders of record as of June 1, 2017 . Reclassifications Certain prior-year amounts have been reclassified for comparative purposes. Recent Accounting Developments 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 calculated the impact of the ASU No. 2016-18 on its statement of cash flows to be a decrease of $59 million and $23 million in the net cash used in investing activities for the three months ended March 31, 2017 and 2016, respectively . 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. As this review is still in process, it is currently not practicable to quantify the impact of adopting Topic 842 at this time. 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; however, the Company continues to assess the impact in connection with its plan of adoption.

Variable Interest Entities

Variable Interest Entities	3 Months Ended
	Mar. 31, 2017
Equity Method Investments and Joint Ventures [Abstract]
Investments Accounted for by the Equity Method and Variable Interest Entities	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 NRG 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 $1 million of working capital. 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 $328 million , which it consolidates, as further described in Note 6 , Long-term Debt , as well as its pro-rata share of non-recourse project-level debt of $135 million , as further described below. 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 $139 million was recorded as an adjustment to the Company'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). 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. 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 Company's 2016 Form 10-K. Summarized financial information for the Company's consolidated VIEs consisted of the following as of March 31, 2017 : (In millions) NRG Wind TE Holdco Alta Wind TE Holdco Spring Canyon Other current and non-current assets $ 193 $ 18 $ 4 Property, plant and equipment 435 455 99 Intangible assets 2 271 — Total assets 630 744 103 Current and non-current liabilities 210 8 6 Total liabilities 210 8 6 Noncontrolling interest 141 106 66 Net assets less noncontrolling interests $ 279 $ 630 $ 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 Company's 2016 Form 10-K. The Company's maximum exposure to loss as of March 31, 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 $ 228 Granite Mountain Holdings, LLC 81 Iron Springs Holdings, LLC 54 NRG DGPV Holdco 1 LLC 73 NRG DGPV Holdco 2 LLC 34 NRG RPV Holdco 1 LLC 70 GenConn Energy LLC 104 Utah Solar Portfolio — As described above, 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 Company's significant equity method investments: Three months ended March 31, (In millions) 2017 2016 Income Statement Data: Utah Solar Portfolio Operating revenues $ 13 $ — Operating loss (2 ) — Net loss (2 ) — GenConn Energy LLC Operating revenues $ 17 $ 18 Operating income 9 9 Net income 6 7 March 31, 2017 December 31, 2016 Balance Sheet Data: (In millions) Utah Solar Portfolio Current assets $ 15 $ 20 Non-current assets 1,109 1,105 Current liabilities 3 14 Non-current liabilities 21 38 GenConn Energy LLC Current assets $ 29 $ 36 Non-current assets 385 389 Current liabilities 12 16 Non-current liabilities 193 196 Non-recourse project-level debt of unconsolidated affiliates Agua Caliente Financing — As described above, the Company acquired a 16% interest in the Agua Caliente solar facility through its acquisition of Agua Caliente Borrower 2 LLC. As of March 31, 2017 , Agua Caliente Solar LLC, the direct owner of the Agua Caliente solar facility, had $846 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 Agua Caliente Financing was approximately $135 million as of March 31, 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	3 Months Ended
	Mar. 31, 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 March 31, 2017 As of December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value (In millions) Assets: Notes receivable, including current portion $ 25 $ 25 $ 30 $ 30 Liabilities: Long-term debt — affiliate 618 613 618 608 Long-term debt — external, including current portion $ 5,418 $ 5,413 $ 5,451 $ 5,435 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 March 31, 2017 and December 31, 2016 : As of March 31, 2017 As of December 31, 2016 Level 2 Level 3 Level 2 Level 3 (In millions) Long-term debt, including current portion $ 844 $ 5,182 $ 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 March 31, 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 $ 1 Interest rate contracts 2 — 1 Total assets 3 1 2 Derivative liabilities: Commodity contracts 2 — 1 Interest rate contracts 66 — 75 Total liabilities $ 68 $ — $ 76 (a) There were no derivative assets or liabilities classified as Level 1 as of March 31, 2017 . There were no derivative assets or liabilities classified as Level 3 as of March 31, 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 March 31, 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 Company's 2016 Form 10-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 March 31, 2017 , credit risk exposure to these counterparties attributable to the Company's ownership interests was approximately $3 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, as further described in Note 12 , Segment Reporting , to the Company's 2016 Form 10-K . 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)	3 Months Ended
	Mar. 31, 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 Company's 2016 Form 10-K. Energy-Related Commodities As of March 31, 2017 , the Company had energy-related derivative instruments extending through 2020. At March 31, 2017 , these contracts were not designated as cash flow or fair value hedges. Interest Rate Swaps As of March 31, 2017 , the Company had interest rate derivative instruments on non-recourse debt extending through 2036, most 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 March 31, 2017 December 31, 2016 Commodity Units (In millions) Natural Gas MMBtu 2 3 Interest Dollars $ 2,028 $ 2,070 Fair Value of Derivative Instruments The following table summarizes the fair value within the derivative instrument valuation on the balance sheet: Fair Value Derivative Assets Derivative Liabilities March 31, 2017 December 31, 2016 March 31, 2017 December 31, 2016 (In millions) Derivatives Designated as Cash Flow Hedges: Interest rate contracts current $ — $ — $ 20 $ 26 Interest rate contracts long-term 2 1 29 39 Total Derivatives Designated as Cash Flow Hedges 2 1 49 65 Derivatives Not Designated as Cash Flow Hedges : Interest rate contracts current — — 7 5 Interest rate contracts long-term — — 10 5 Commodity contracts current 1 2 1 1 Commodity contracts long-term — — 1 — Total Derivatives Not Designated as Cash Flow Hedges 1 2 19 11 Total Derivatives $ 3 $ 3 $ 68 $ 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 March 31, 2017 and 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 March 31, 2017 and December 31, 2016 : As of March 31, 2017 Gross Amounts of Recognized Assets/Liabilities Derivative Instruments Net Amount Commodity contracts: (In millions) Derivative assets $ 1 $ — $ 1 Derivative liabilities (2 ) — (2 ) Total commodity contracts (1 ) — (1 ) Interest rate contracts: Derivative assets 2 (1 ) 1 Derivative liabilities (66 ) 1 (65 ) Total interest rate contracts (64 ) — (64 ) Total derivative instruments $ (65 ) $ — $ (65 ) 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 March 31, 2017 2016 (In millions) Accumulated OCL beginning balance $ (86 ) $ (99 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 5 4 Mark-to-market of cash flow hedge accounting contracts 2 (54 ) Accumulated OCL ending balance (79 ) (149 ) Accumulated OCL attributable to noncontrolling interests (3 ) (4 ) Accumulated OCL attributable to NRG Yield LLC $ (76 ) $ (145 ) Losses expected to be realized from OCL during the next 12 months $ (18 ) 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 three months ended March 31, 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. 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 March 31, 2017 and 2016 , the impact to the consolidated statements of income was a gain of $2 million and a loss of $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 4 , Fair Value of Financial Instruments , for a discussion regarding concentration of credit risk.

Long-term Debt

Long-term Debt	3 Months Ended
	Mar. 31, 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 Company's 2016 Form 10-K. Long-term debt consisted of the following: March 31, 2017 December 31, 2016 March 31, 2017, interest rate % (a) Letters of Credit Outstanding at March 31, 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 144 145 L+1.750 37 Alta Wind I, lease financing arrangement, due 2034 242 242 7.015 16 Alta Wind II, lease financing arrangement, due 2034 191 191 5.696 27 Alta Wind III, lease financing arrangement, due 2034 198 198 6.067 27 Alta Wind IV, lease financing arrangement, due 2034 128 128 5.938 19 Alta Wind V, lease financing arrangement, due 2035 206 206 6.071 30 Alta Realty Investments, due 2031 31 31 7.000 — Alta Wind Asset Management, due 2031 18 18 L+2.375 — Avra Valley, due 2031 56 57 L+1.750 3 Blythe, due 2028 19 19 L+1.625 2 Borrego, due 2025 and 2038 69 69 L+ 2.500/5.650 5 CVSR, due 2037 757 771 2.339 - 3.775 — CVSR Holdco Notes, due 2037 194 199 4.680 13 El Segundo Energy Center, due 2023 414 443 L+1.625 - L+2.250 82 Energy Center Minneapolis, due 2017 and 2025 94 96 5.950 -7.250 — Energy Center Minneapolis Series D Notes, due 2031 125 125 3.550 — Kansas South, due 2031 30 30 L+2.000 4 Laredo Ridge, due 2028 98 100 L+1.875 10 Marsh Landing, due 2017 and 2023 361 370 L+1.750 - L+1.875 37 Apple I LLC projects and related subsidiaries financing agreement, due 2030 27 27 6.000 — Roadrunner, due 2031 37 37 L+1.625 5 South Trent Wind, due 2020 57 57 L+1.625 10 TA High Desert, due 2020 and 2032 49 49 L+2.500/5.150 — Tapestry, due 2021 168 172 L+1.625 20 Utah Solar Portfolio, due 2022 287 287 L+2.625 11 Viento, due 2023 178 178 L+2.750 27 Walnut Creek, due 2023 303 310 L+1.625 52 WCEP Holdings, due 2023 46 46 L+3.000 — Subtotal project-level debt: 4,568 4,601 Total debt 6,036 6,069 Less current maturities (296 ) (291 ) Less net debt issuance costs (61 ) (62 ) Total long-term debt $ 5,679 $ 5,716 (a) As of March 31, 2017 , L+ equals 3 month LIBOR plus x%, except for the Alpine term loan, Marsh Landing term loan, Utah Solar Portfolio, Viento, Walnut Creek term loan, and NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, where L+ equals 1 month LIBOR plus x% and Kansas South, where L+ equals 6 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 March 31, 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 three months ended March 31, 2017 .

Segment Reporting

Segment Reporting	3 Months Ended
	Mar. 31, 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 March 31, 2017 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 75 $ 99 $ 44 $ — $ 218 Cost of operations 22 32 30 — 84 Depreciation and amortization 24 46 5 — 75 General and administrative — — — 4 4 Acquisition-related transaction and integration costs — — — 1 1 Operating income (loss) 29 21 9 (5 ) 54 Equity in earnings of unconsolidated affiliates 3 16 — — 19 Other income, net — 1 — — 1 Interest expense (12 ) (40 ) (3 ) (18 ) (73 ) Net Income (Loss) $ 20 $ (2 ) $ 6 $ (23 ) $ 1 Total Assets $ 1,937 $ 5,901 $ 431 $ 97 $ 8,366 Three months ended March 31, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 79 $ 111 $ 44 $ — $ 234 Cost of operations 23 33 29 — 85 Depreciation and amortization 20 49 5 — 74 General and administrative — — — 2 2 Operating income (loss) 36 29 10 (2 ) 73 Equity in earnings of unconsolidated affiliates 3 1 — — 4 Interest expense (11 ) (42 ) (2 ) (16 ) (71 ) Net Income (Loss) $ 28 $ (12 ) $ 8 $ (18 ) $ 6

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 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. PPA by and between Elbow Creek and NRG In October 2015, Elbow Creek, the Company's subsidiary in the Renewables segment, entered into a PPA with NRG Power Marketing for the sale of energy and environmental attributes with the effective date of November 1, 2015, and expiring on October 31, 2022. Elbow Creek generated $3 million of revenue during the three months ended March 31, 2017 and 2016 , respectively. Energy Marketing Services Agreement by and between NRG Energy Center Minneapolis LLC and NRG NRG Energy Center Minneapolis LLC, or NRG Minneapolis, a subsidiary of the Company is party to an Energy Marketing Services Agreement with NRG Power Marketing, a wholly-owned subsidiary of NRG. Under the agreement, NRG Power Marketing procures fuel and fuel transportation for the operation of the Minneapolis generating facility. For the three months ended March 31, 2017 and 2016 , NRG Minneapolis purchased $4 million and $3 million , respectively, of natural gas from NRG Power Marketing. Operation and Maintenance (O&M) Services Agreements by and between Thermal Entities and NRG Certain thermal entities which are wholly-owned subsidiaries of the Company are party to a Plant O&M Services Agreement with NRG, pursuant to which NRG provides 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. Total fees incurred under the agreements were $8 million and $7 million for the three months ended March 31, 2017 and 2016 , respectively. There was a balance of $19 million and $20 million due to NRG in accounts payable — affiliate as of March 31, 2017 and December 31, 2016 , respectively. As of March 31, 2017 , $13 million of the balance was recorded in the current liabilities of the consolidated balance sheet and $6 million was recorded in long term liabilities of the consolidated balance sheet. 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. The Company reimbursed costs under this agreement of $3 million and $2 million for the three months ended March 31, 2017 and 2016 , respectively. There was a balance of $1 million due to NRG West Coast LLC in accounts payable — affiliate as of March 31, 2017 . Administrative Services Agreement by and between the Company and NRG Renew Operations & Maintenance LLC Various wholly-owned subsidiaries of the Company in the Renewables segment are party to an administrative services agreement with NRG Renew Operations 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 $3 million and $2 million for the three months ended March 31, 2017 and 2016 , respectively. There was a balance of $3 million and $5 million due to RENOM as of March 31, 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 March 31, 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 for the three months ended March 31, 2017 and 2016 , which included certain direct expenses incurred by NRG on behalf of the Company in addition to the base management fee. There was a balance of $2 million due to NRG in accounts payable — affiliate as of March 31, 2017 .

Condensed Consolidating Financi

Condensed Consolidating Financial Information Condensed Consolidating Financial Information	3 Months Ended
	Mar. 31, 2017
Condensed Consolidating Financial Information Disclosure [Abstract]
Condensed Financial Statements [Text Block]	Condensed Consolidating Financial Information As of March 31, 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 6 , Long-term Debt , 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 March 31, 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 2024 Senior Notes and the 2026 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 March 2017 Drop Down Assets and CVSR Drop Down Asset from NRG on 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 March 31, 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 $ — $ 5 $ 213 $ — $ — $ 218 Operating Costs and Expenses Cost of operations — 4 80 — — 84 Depreciation and amortization — 1 74 — — 75 General and administrative — — — 4 — 4 Acquisition-related transaction and integration costs — — — 1 — 1 Total operating costs and expenses — 5 154 5 — 164 Operating Income (Loss) — — 59 (5 ) — 54 Other Income (Expense) Equity in earnings (losses) of consolidated affiliates 10 (11 ) — 23 (22 ) — Equity in earnings of unconsolidated affiliates — 2 16 1 — 19 Other income, net — — 1 — — 1 Interest expense — — (55 ) (18 ) — (73 ) Total other income (expense), net 10 (9 ) (38 ) 6 (22 ) (53 ) Net Income (Loss) 10 (9 ) 21 1 (22 ) 1 Less: Net loss attributable to noncontrolling interests — — (1 ) (9 ) 1 (9 ) Net Income (Loss) Attributable to $ 10 $ (9 ) $ 22 $ 10 $ (23 ) $ 10 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) For the Three Months Ended March 31, 2017 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income (Loss) $ 10 $ (9 ) $ 21 $ 1 $ (22 ) $ 1 Other Comprehensive Income Unrealized gain on derivatives 7 — 6 7 (13 ) 7 Other comprehensive income 7 — 6 7 (13 ) 7 Comprehensive Income (Loss) 17 (9 ) 27 8 (35 ) 8 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (9 ) 1 (9 ) Comprehensive Income (Loss) Attributable to NRG Yield LLC $ 17 $ (9 ) $ 28 $ 17 $ (36 ) $ 17 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 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 $ 93 $ — $ 117 $ — $ — $ 210 Restricted cash — — 106 — — 106 Accounts receivable — trade — 2 80 — — 82 Accounts receivable — affiliate 3 — — — — 3 Inventory — 1 39 — — 40 Derivative instruments — — 1 — — 1 Notes receivable — — 15 — — 15 Prepayments and other current assets — — 19 — — 19 Total current assets 96 3 377 — — 476 Net property, plant and equipment — 58 5,332 — — 5,390 Other Assets Investment in consolidated subsidiaries 1,699 483 — 3,134 (5,316 ) — Equity investments in affiliates — 177 610 367 — 1,154 Notes receivable — — 10 — — 10 Intangible assets, net — 55 1,213 — — 1,268 Derivative instruments — — 2 — — 2 Other non-current assets — — 65 1 — 66 Total other assets 1,699 715 1,900 3,502 (5,316 ) 2,500 Total Assets $ 1,795 $ 776 $ 7,609 $ 3,502 $ (5,316 ) $ 8,366 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 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 $ — $ — $ 296 $ — $ — $ 296 Accounts payable — 1 25 — — 26 Accounts payable — affiliate — 5 23 22 — 50 Derivative instruments — — 28 — — 28 Accrued expenses and other current liabilities — 1 42 11 — 54 Total current liabilities — 7 414 33 — 454 Other Liabilities Long-term debt — external — — 4,222 839 — 5,061 Long-term debt — affiliate — — — 618 — 618 Accounts payable — affiliate — — 6 — — 6 Derivative instruments — — 40 — — 40 Other non-current liabilities — — 79 — — 79 Total non-current liabilities — — 4,347 1,457 — 5,804 Total Liabilities — 7 4,761 1,490 — 6,258 Commitments and Contingencies Members' Equity Contributed capital 1,865 845 2,856 1,957 (5,658 ) 1,865 Retained earnings (accumulated deficit) 6 (74 ) 11 (182 ) 245 6 Accumulated other comprehensive loss (76 ) (2 ) (81 ) (76 ) 159 (76 ) Noncontrolling interest — — 62 313 (62 ) 313 Total Members' Equity 1,795 769 2,848 2,012 (5,316 ) 2,108 Total Liabilities and Members’ Equity $ 1,795 $ 776 $ 7,609 $ 3,502 $ (5,316 ) $ 8,366 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Three Months ended March 31, 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 $ — $ 1 $ 109 $ (49 ) $ 61 Cash Flows from Investing Activities Intercompany transactions between Yield LLC and subsidiaries (65 ) — — 65 — Acquisition of Drop Down Assets — — — (131 ) (131 ) Capital expenditures — — (4 ) — (4 ) Increase in restricted cash — — 59 — 59 Decrease in notes receivable — — 4 — 4 Return of investment from unconsolidated affiliates — 3 — 13 16 Net investments in unconsolidated affiliates — (3 ) (4 ) — (7 ) Net Cash (Used in) Provided by Investing Activities (65 ) — 55 (53 ) (63 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement (5 ) (1 ) — 6 — Net contributions from noncontrolling interests — — — 14 14 Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets — — (38 ) — (38 ) (Payments of) proceeds from distributions (53 ) — (82 ) 82 (53 ) Payment of debt issuance costs — — (3 ) — (3 ) Proceeds from Issuance of Class C units 5 — — — 5 Proceeds from the issuance of long-term debt — external — — 41 — 41 Payments for long-term debt — — (75 ) — (75 ) Net Cash (Used in) Provided by Financing Activities (53 ) (1 ) (157 ) 102 (109 ) Net (Decrease) Increase in Cash and Cash Equivalents (118 ) — 7 — (111 ) Cash and Cash Equivalents at Beginning of Period 211 — 110 — 321 Cash and Cash Equivalents at End of Period $ 93 $ — $ 117 $ — $ 210 NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Three Months Ended March 31, 2016 (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 $ — $ 5 $ 229 $ — $ — $ 234 Operating Costs and Expenses Cost of operations — 3 82 — — 85 Depreciation and amortization — 1 73 — — 74 General and administrative — — — 2 — 2 Total operating costs and expenses — 4 155 2 — 161 Operating Income (Loss) — 1 74 (2 ) — 73 Other (Expense) Income Equity in income (losses) of consolidated affiliates 17 (7 ) — 21 (31 ) — Equity in earnings (losses) of unconsolidated affiliates — 2 (1 ) 3 — 4 Interest expense — — (55 ) (16 ) — (71 ) Total other income (expense), net 17 (5 ) (56 ) 8 (31 ) (67 ) Net Income (Loss) 17 (4 ) 18 6 (31 ) 6 Less: Net loss attributable to noncontrolling interests — — — (11 ) — (11 ) Net Income (Loss) Attributable to NRG Yield LLC $ 17 $ (4 ) $ 18 $ 17 $ (31 ) $ 17 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2016 (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 $ 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 1,780 527 — 3,212 (5,519 ) — Equity investments in affiliates — 171 600 381 — 1,152 Notes receivable — — 14 — — 14 Intangible assets, net — 56 1,230 — — 1,286 Derivative instruments — — 1 — — 1 Other non-current assets — — 50 1 — 51 Total other assets 1,780 754 1,895 3,594 (5,519 ) 2,504 Total Assets $ 1,991 $ 817 $ 7,736 $ 3,595 $ (5,519 ) $ 8,620 (a) 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 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 $ — $ — $ 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 1,995 874 2,920 1,971 (5,765 ) 1,995 Retained earnings (Accumulated deficit) 79 (65 ) 35 (108 ) 138 79 Accumulated other comprehensive loss (83 ) (2 ) (87 ) (83 ) 172 (83 ) Noncontrolling Interest — — 64 313 (64 ) 313 Total Members' Equity 1,991 807 2,932 2,093 (5,519 ) 2,304 Total Liabilities and Members’ Equity $ 1,991 $ 817 $ 7,736 $ 3,595 $ (5,519 ) $ 8,620 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Three Months Ended March 31, 2016 (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 $ — $ 1 $ 99 $ (11 ) $ 89 Cash Flows from Investing Activities Intercompany transactions from Yield LLC to subsidiaries 12 40 — (52 ) — Capital expenditures — — (7 ) — (7 ) Decrease in restricted cash — — 23 — 23 Decrease in notes receivable — — 4 — 4 Return of investment from unconsolidated affiliates — — — 8 8 Net investments in unconsolidated affiliates — (40 ) — (11 ) (51 ) Other — — — 2 2 Net Cash Provided by (Used in) Investing Activities 12 — 20 (53 ) (21 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement 24 (1 ) — (23 ) — Net contributions from noncontrolling interests — — — 10 10 Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets — — (11 ) — (11 ) (Payments of) proceeds from distributions (41 ) — (71 ) 67 (45 ) Proceeds from the revolving credit facility — — — 50 50 Payments for the revolving credit facility — — — (40 ) (40 ) Payments for long-term debt — — (67 ) — (67 ) Net Cash (Used in) Provided by Financing Activities (17 ) (1 ) (149 ) 64 (103 ) Net (Decrease) Increase in Cash and Cash Equivalents (5 ) — (30 ) — (35 ) Cash and Cash Equivalents at Beginning of Period 15 — 95 — 110 Cash and Cash Equivalents at End of Period $ 10 $ — $ 65 $ — $ 75

Commitments and Contingencies (

Commitments and Contingencies (Notes)	3 Months Ended
	Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies Disclosure [Text Block]	Contingencies 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. 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.

Summary of Significant Accoun16

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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 three months ended March 31, 2017 : First Quarter 2017 Distributions per Class A, B, C and D unit $ 0.26 On April 25, 2017 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.27 per unit payable on June 15, 2017 to unit holders of record as of June 1, 2017 . 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.
Recent Accounting Developments	Recent Accounting Developments 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 calculated the impact of the ASU No. 2016-18 on its statement of cash flows to be a decrease of $59 million and $23 million in the net cash used in investing activities for the three months ended March 31, 2017 and 2016, respectively . 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. As this review is still in process, it is currently not practicable to quantify the impact of adopting Topic 842 at this time. 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; however, the Company continues to assess the impact in connection with its plan of adoption.
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 313 Capital contributions from tax equity investors, net of distributions 14 Comprehensive income (9 ) Distributions to NRG for its 25% interest in TE Holdco (5 ) Balance as of March 31, 2017 $ 313

Segment Reporting Segment Repor

Segment Reporting Segment Reporting (Policies)	3 Months Ended
	Mar. 31, 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)	3 Months Ended
	Mar. 31, 2017
Nature of Business Disclosure [Abstract]
IPO of NRG Yield [Table Text Block]	The following table represents the structure of the Company as of March 31, 2017 :
Schedule of Ownership [Table Text Block]	As of March 31, 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 (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) 74.3 % 16 Corn Belt Power Cooperative 2027 Elbow Creek (b) (f) 75 % 92 NRG Power Marketing LLC 2022 Elkhorn Ridge (b) (f) 50.3 % 41 Nebraska Public Power District 2029 Forward (b) (f) 75 % 22 Constellation NewEnergy, Inc. 2017 Goat Wind (b) (f) 74.9 % 113 Dow Pipeline Company 2025 Hardin (b) (f) 74.3 % 11 Interstate Power and Light Company 2027 Laredo Ridge 100 % 80 Nebraska Public Power District 2031 Lookout (b) (f) 75 % 29 Southern Maryland Electric Cooperative 2030 Odin (b) (f) 74.9 % 15 Missouri River Energy Services 2028 Pinnacle 100 % 55 Maryland Department of General Services and University System of Maryland 2031 San Juan Mesa (b) (f) 56.3 % 68 Southwestern Public Service Company 2025 Sleeping Bear (b) (f) 75 % 71 Public Service Company of Oklahoma 2032 South Trent 100 % 101 AEP Energy Partners 2029 Spanish Fork (b) (f) 75 % 14 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) 74.9 % 121 Southwestern Public Service Company 2027 Projects Percentage Ownership Net Capacity (MW) (a) Offtake Counterparty Expiration 1,999 Thermal Thermal equivalent MWt (c) 100 % 1,319 Various Various NRG Dover Energy Center LLC 100 % 103 NRG Power Marketing LLC 2018 Thermal generation 100 % 20 Various Various 1,442 Total net capacity (excluding equivalent MWt) (d) 5,002 (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 March 31, 2017 . (b) Projects are part of tax equity arrangements . (c) 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. (d) 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 5,008 MWs. (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 Accoun19

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2017
Accounting Policies [Abstract]
Schedule of Accumulated Depreciation and Amortization [Table Text Block]	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 March 31, 2017 and December 31, 2016: March 31, 2017 December 31, 2016 (In millions) Property, Plant and Equipment Accumulated Depreciation $ 1,025 $ 951 Intangible Assets Accumulated Amortization 181 163
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 three months ended March 31, 2017 : First Quarter 2017 Distributions per Class A, B, C and D unit $ 0.26 On April 25, 2017 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.27 per unit payable on June 15, 2017 to unit holders of record as of June 1, 2017 . 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 313 Capital contributions from tax equity investors, net of distributions 14 Comprehensive income (9 ) Distributions to NRG for its 25% interest in TE Holdco (5 ) Balance as of March 31, 2017 $ 313

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	3 Months Ended
	Mar. 31, 2017
March 2017 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Schedule of Variable Interest Entities [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
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 March 31, 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 $ 228 Granite Mountain Holdings, LLC 81 Iron Springs Holdings, LLC 54 NRG DGPV Holdco 1 LLC 73 NRG DGPV Holdco 2 LLC 34 NRG RPV Holdco 1 LLC 70 GenConn Energy LLC 104
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 March 31, 2017 : (In millions) NRG Wind TE Holdco Alta Wind TE Holdco Spring Canyon Other current and non-current assets $ 193 $ 18 $ 4 Property, plant and equipment 435 455 99 Intangible assets 2 271 — Total assets 630 744 103 Current and non-current liabilities 210 8 6 Total liabilities 210 8 6 Noncontrolling interest 141 106 66 Net assets less noncontrolling interests $ 279 $ 630 $ 31

Fair Value of Financial Instr21

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 2016 (In millions) Accumulated OCL beginning balance $ (86 ) $ (99 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 5 4 Mark-to-market of cash flow hedge accounting contracts 2 (54 ) Accumulated OCL ending balance (79 ) (149 ) Accumulated OCL attributable to noncontrolling interests (3 ) (4 ) Accumulated OCL attributable to NRG Yield LLC $ (76 ) $ (145 ) Losses expected to be realized from OCL during the next 12 months $ (18 )
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 March 31, 2017 As of December 31, 2016 Carrying Amount Fair Value Carrying Amount Fair Value (In millions) Assets: Notes receivable, including current portion $ 25 $ 25 $ 30 $ 30 Liabilities: Long-term debt — affiliate 618 613 618 608 Long-term debt — external, including current portion $ 5,418 $ 5,413 $ 5,451 $ 5,435
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 March 31, 2017 and December 31, 2016 : As of March 31, 2017 As of December 31, 2016 Level 2 Level 3 Level 2 Level 3 (In millions) Long-term debt, including current portion $ 844 $ 5,182 $ 833 $ 5,210
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	As of March 31, 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 $ 1 Interest rate contracts 2 — 1 Total assets 3 1 2 Derivative liabilities: Commodity contracts 2 — 1 Interest rate contracts 66 — 75 Total liabilities $ 68 $ — $ 76

Accounting for Derivative Ins22

Accounting for Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2017 December 31, 2016 Commodity Units (In millions) Natural Gas MMBtu 2 3 Interest Dollars $ 2,028 $ 2,070
Fair value within the derivative instrument valuation on the balance sheets	he following table summarizes the fair value within the derivative instrument valuation on the balance sheet: Fair Value Derivative Assets Derivative Liabilities March 31, 2017 December 31, 2016 March 31, 2017 December 31, 2016 (In millions) Derivatives Designated as Cash Flow Hedges: Interest rate contracts current $ — $ — $ 20 $ 26 Interest rate contracts long-term 2 1 29 39 Total Derivatives Designated as Cash Flow Hedges 2 1 49 65 Derivatives Not Designated as Cash Flow Hedges : Interest rate contracts current — — 7 5 Interest rate contracts long-term — — 10 5 Commodity contracts current 1 2 1 1 Commodity contracts long-term — — 1 — Total Derivatives Not Designated as Cash Flow Hedges 1 2 19 11 Total Derivatives $ 3 $ 3 $ 68 $ 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 March 31, 2017 and 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 March 31, 2017 and December 31, 2016 : As of March 31, 2017 Gross Amounts of Recognized Assets/Liabilities Derivative Instruments Net Amount Commodity contracts: (In millions) Derivative assets $ 1 $ — $ 1 Derivative liabilities (2 ) — (2 ) Total commodity contracts (1 ) — (1 ) Interest rate contracts: Derivative assets 2 (1 ) 1 Derivative liabilities (66 ) 1 (65 ) Total interest rate contracts (64 ) — (64 ) Total derivative instruments $ (65 ) $ — $ (65 ) 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 March 31, 2017 2016 (In millions) Accumulated OCL beginning balance $ (86 ) $ (99 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 5 4 Mark-to-market of cash flow hedge accounting contracts 2 (54 ) Accumulated OCL ending balance (79 ) (149 ) Accumulated OCL attributable to noncontrolling interests (3 ) (4 ) Accumulated OCL attributable to NRG Yield LLC $ (76 ) $ (145 ) Losses expected to be realized from OCL during the next 12 months $ (18 )

Long-term Debt (Tables)

Long-term Debt (Tables)	3 Months Ended
	Mar. 31, 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 Company's 2016 Form 10-K. Long-term debt consisted of the following: March 31, 2017 December 31, 2016 March 31, 2017, interest rate % (a) Letters of Credit Outstanding at March 31, 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 144 145 L+1.750 37 Alta Wind I, lease financing arrangement, due 2034 242 242 7.015 16 Alta Wind II, lease financing arrangement, due 2034 191 191 5.696 27 Alta Wind III, lease financing arrangement, due 2034 198 198 6.067 27 Alta Wind IV, lease financing arrangement, due 2034 128 128 5.938 19 Alta Wind V, lease financing arrangement, due 2035 206 206 6.071 30 Alta Realty Investments, due 2031 31 31 7.000 — Alta Wind Asset Management, due 2031 18 18 L+2.375 — Avra Valley, due 2031 56 57 L+1.750 3 Blythe, due 2028 19 19 L+1.625 2 Borrego, due 2025 and 2038 69 69 L+ 2.500/5.650 5 CVSR, due 2037 757 771 2.339 - 3.775 — CVSR Holdco Notes, due 2037 194 199 4.680 13 El Segundo Energy Center, due 2023 414 443 L+1.625 - L+2.250 82 Energy Center Minneapolis, due 2017 and 2025 94 96 5.950 -7.250 — Energy Center Minneapolis Series D Notes, due 2031 125 125 3.550 — Kansas South, due 2031 30 30 L+2.000 4 Laredo Ridge, due 2028 98 100 L+1.875 10 Marsh Landing, due 2017 and 2023 361 370 L+1.750 - L+1.875 37 Apple I LLC projects and related subsidiaries financing agreement, due 2030 27 27 6.000 — Roadrunner, due 2031 37 37 L+1.625 5 South Trent Wind, due 2020 57 57 L+1.625 10 TA High Desert, due 2020 and 2032 49 49 L+2.500/5.150 — Tapestry, due 2021 168 172 L+1.625 20 Utah Solar Portfolio, due 2022 287 287 L+2.625 11 Viento, due 2023 178 178 L+2.750 27 Walnut Creek, due 2023 303 310 L+1.625 52 WCEP Holdings, due 2023 46 46 L+3.000 — Subtotal project-level debt: 4,568 4,601 Total debt 6,036 6,069 Less current maturities (296 ) (291 ) Less net debt issuance costs (61 ) (62 ) Total long-term debt $ 5,679 $ 5,716 (a) As of March 31, 2017 , L+ equals 3 month LIBOR plus x%, except for the Alpine term loan, Marsh Landing term loan, Utah Solar Portfolio, Viento, Walnut Creek term loan, and NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, where L+ equals 1 month LIBOR plus x% and Kansas South, where L+ equals 6 month LIBOR plus x%.

Segment Reporting (Tables)

Segment Reporting (Tables)	3 Months Ended
	Mar. 31, 2017
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three months ended March 31, 2017 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 75 $ 99 $ 44 $ — $ 218 Cost of operations 22 32 30 — 84 Depreciation and amortization 24 46 5 — 75 General and administrative — — — 4 4 Acquisition-related transaction and integration costs — — — 1 1 Operating income (loss) 29 21 9 (5 ) 54 Equity in earnings of unconsolidated affiliates 3 16 — — 19 Other income, net — 1 — — 1 Interest expense (12 ) (40 ) (3 ) (18 ) (73 ) Net Income (Loss) $ 20 $ (2 ) $ 6 $ (23 ) $ 1 Total Assets $ 1,937 $ 5,901 $ 431 $ 97 $ 8,366 Three months ended March 31, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 79 $ 111 $ 44 $ — $ 234 Cost of operations 23 33 29 — 85 Depreciation and amortization 20 49 5 — 74 General and administrative — — — 2 2 Operating income (loss) 36 29 10 (2 ) 73 Equity in earnings of unconsolidated affiliates 3 1 — — 4 Interest expense (11 ) (42 ) (2 ) (16 ) (71 ) Net Income (Loss) $ 28 $ (12 ) $ 8 $ (18 ) $ 6

Condensed Consolidating Finan25

Condensed Consolidating Financial Information Condensed Consolidating Financial Information (Tables)	3 Months Ended
	Mar. 31, 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 Three Months ended March 31, 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 $ — $ 1 $ 109 $ (49 ) $ 61 Cash Flows from Investing Activities Intercompany transactions between Yield LLC and subsidiaries (65 ) — — 65 — Acquisition of Drop Down Assets — — — (131 ) (131 ) Capital expenditures — — (4 ) — (4 ) Increase in restricted cash — — 59 — 59 Decrease in notes receivable — — 4 — 4 Return of investment from unconsolidated affiliates — 3 — 13 16 Net investments in unconsolidated affiliates — (3 ) (4 ) — (7 ) Net Cash (Used in) Provided by Investing Activities (65 ) — 55 (53 ) (63 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement (5 ) (1 ) — 6 — Net contributions from noncontrolling interests — — — 14 14 Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets — — (38 ) — (38 ) (Payments of) proceeds from distributions (53 ) — (82 ) 82 (53 ) Payment of debt issuance costs — — (3 ) — (3 ) Proceeds from Issuance of Class C units 5 — — — 5 Proceeds from the issuance of long-term debt — external — — 41 — 41 Payments for long-term debt — — (75 ) — (75 ) Net Cash (Used in) Provided by Financing Activities (53 ) (1 ) (157 ) 102 (109 ) Net (Decrease) Increase in Cash and Cash Equivalents (118 ) — 7 — (111 ) Cash and Cash Equivalents at Beginning of Period 211 — 110 — 321 Cash and Cash Equivalents at End of Period $ 93 $ — $ 117 $ — $ 210 NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Three Months Ended March 31, 2016 (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 $ — $ 1 $ 99 $ (11 ) $ 89 Cash Flows from Investing Activities Intercompany transactions from Yield LLC to subsidiaries 12 40 — (52 ) — Capital expenditures — — (7 ) — (7 ) Decrease in restricted cash — — 23 — 23 Decrease in notes receivable — — 4 — 4 Return of investment from unconsolidated affiliates — — — 8 8 Net investments in unconsolidated affiliates — (40 ) — (11 ) (51 ) Other — — — 2 2 Net Cash Provided by (Used in) Investing Activities 12 — 20 (53 ) (21 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement 24 (1 ) — (23 ) — Net contributions from noncontrolling interests — — — 10 10 Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets — — (11 ) — (11 ) (Payments of) proceeds from distributions (41 ) — (71 ) 67 (45 ) Proceeds from the revolving credit facility — — — 50 50 Payments for the revolving credit facility — — — (40 ) (40 ) Payments for long-term debt — — (67 ) — (67 ) Net Cash (Used in) Provided by Financing Activities (17 ) (1 ) (149 ) 64 (103 ) Net (Decrease) Increase in Cash and Cash Equivalents (5 ) — (30 ) — (35 ) Cash and Cash Equivalents at Beginning of Period 15 — 95 — 110 Cash and Cash Equivalents at End of Period $ 10 $ — $ 65 $ — $ 75
Condensed Balance Sheet [Table Text Block]	NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 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 $ 93 $ — $ 117 $ — $ — $ 210 Restricted cash — — 106 — — 106 Accounts receivable — trade — 2 80 — — 82 Accounts receivable — affiliate 3 — — — — 3 Inventory — 1 39 — — 40 Derivative instruments — — 1 — — 1 Notes receivable — — 15 — — 15 Prepayments and other current assets — — 19 — — 19 Total current assets 96 3 377 — — 476 Net property, plant and equipment — 58 5,332 — — 5,390 Other Assets Investment in consolidated subsidiaries 1,699 483 — 3,134 (5,316 ) — Equity investments in affiliates — 177 610 367 — 1,154 Notes receivable — — 10 — — 10 Intangible assets, net — 55 1,213 — — 1,268 Derivative instruments — — 2 — — 2 Other non-current assets — — 65 1 — 66 Total other assets 1,699 715 1,900 3,502 (5,316 ) 2,500 Total Assets $ 1,795 $ 776 $ 7,609 $ 3,502 $ (5,316 ) $ 8,366 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS March 31, 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 $ — $ — $ 296 $ — $ — $ 296 Accounts payable — 1 25 — — 26 Accounts payable — affiliate — 5 23 22 — 50 Derivative instruments — — 28 — — 28 Accrued expenses and other current liabilities — 1 42 11 — 54 Total current liabilities — 7 414 33 — 454 Other Liabilities Long-term debt — external — — 4,222 839 — 5,061 Long-term debt — affiliate — — — 618 — 618 Accounts payable — affiliate — — 6 — — 6 Derivative instruments — — 40 — — 40 Other non-current liabilities — — 79 — — 79 Total non-current liabilities — — 4,347 1,457 — 5,804 Total Liabilities — 7 4,761 1,490 — 6,258 Commitments and Contingencies Members' Equity Contributed capital 1,865 845 2,856 1,957 (5,658 ) 1,865 Retained earnings (accumulated deficit) 6 (74 ) 11 (182 ) 245 6 Accumulated other comprehensive loss (76 ) (2 ) (81 ) (76 ) 159 (76 ) Noncontrolling interest — — 62 313 (62 ) 313 Total Members' Equity 1,795 769 2,848 2,012 (5,316 ) 2,108 Total Liabilities and Members’ Equity $ 1,795 $ 776 $ 7,609 $ 3,502 $ (5,316 ) $ 8,366 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2016 (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 $ 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 1,780 527 — 3,212 (5,519 ) — Equity investments in affiliates — 171 600 381 — 1,152 Notes receivable — — 14 — — 14 Intangible assets, net — 56 1,230 — — 1,286 Derivative instruments — — 1 — — 1 Other non-current assets — — 50 1 — 51 Total other assets 1,780 754 1,895 3,594 (5,519 ) 2,504 Total Assets $ 1,991 $ 817 $ 7,736 $ 3,595 $ (5,519 ) $ 8,620 (a) 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 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 $ — $ — $ 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 1,995 874 2,920 1,971 (5,765 ) 1,995 Retained earnings (Accumulated deficit) 79 (65 ) 35 (108 ) 138 79 Accumulated other comprehensive loss (83 ) (2 ) (87 ) (83 ) 172 (83 ) Noncontrolling Interest — — 64 313 (64 ) 313 Total Members' Equity 1,991 807 2,932 2,093 (5,519 ) 2,304 Total Liabilities and Members’ Equity $ 1,991 $ 817 $ 7,736 $ 3,595 $ (5,519 ) $ 8,620 (a) All significant intercompany transactions have been eliminated in consolidation.
Condensed Statement of Comprehensive Income [Table Text Block]	CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) For the Three Months Ended March 31, 2017 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income (Loss) $ 10 $ (9 ) $ 21 $ 1 $ (22 ) $ 1 Other Comprehensive Income Unrealized gain on derivatives 7 — 6 7 (13 ) 7 Other comprehensive income 7 — 6 7 (13 ) 7 Comprehensive Income (Loss) 17 (9 ) 27 8 (35 ) 8 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (9 ) 1 (9 ) Comprehensive Income (Loss) Attributable to NRG Yield LLC $ 17 $ (9 ) $ 28 $ 17 $ (36 ) $ 17 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME (LOSS) For the Three Months Ended March 31, 2016 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income (Loss) $ 17 $ (4 ) $ 18 $ 6 $ (31 ) $ 6 Other Comprehensive Loss Unrealized loss on derivatives (49 ) (1 ) (46 ) (50 ) 96 (50 ) Other comprehensive loss (49 ) (1 ) (46 ) (50 ) 96 (50 ) Comprehensive Income (Loss) (32 ) (5 ) (28 ) (44 ) 65 (44 ) Less: Comprehensive loss attributable to noncontrolling interests — — — (12 ) — (12 ) Comprehensive Loss Attributable to NRG Yield LLC $ (32 ) $ (5 ) $ (28 ) $ (32 ) $ 65 $ (32 ) (a) 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 March 31, 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 $ — $ 5 $ 213 $ — $ — $ 218 Operating Costs and Expenses Cost of operations — 4 80 — — 84 Depreciation and amortization — 1 74 — — 75 General and administrative — — — 4 — 4 Acquisition-related transaction and integration costs — — — 1 — 1 Total operating costs and expenses — 5 154 5 — 164 Operating Income (Loss) — — 59 (5 ) — 54 Other Income (Expense) Equity in earnings (losses) of consolidated affiliates 10 (11 ) — 23 (22 ) — Equity in earnings of unconsolidated affiliates — 2 16 1 — 19 Other income, net — — 1 — — 1 Interest expense — — (55 ) (18 ) — (73 ) Total other income (expense), net 10 (9 ) (38 ) 6 (22 ) (53 ) Net Income (Loss) 10 (9 ) 21 1 (22 ) 1 Less: Net loss attributable to noncontrolling interests — — (1 ) (9 ) 1 (9 ) Net Income (Loss) Attributable to $ 10 $ (9 ) $ 22 $ 10 $ (23 ) $ 10 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Three Months Ended March 31, 2016 (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 $ — $ 5 $ 229 $ — $ — $ 234 Operating Costs and Expenses Cost of operations — 3 82 — — 85 Depreciation and amortization — 1 73 — — 74 General and administrative — — — 2 — 2 Total operating costs and expenses — 4 155 2 — 161 Operating Income (Loss) — 1 74 (2 ) — 73 Other (Expense) Income Equity in income (losses) of consolidated affiliates 17 (7 ) — 21 (31 ) — Equity in earnings (losses) of unconsolidated affiliates — 2 (1 ) 3 — 4 Interest expense — — (55 ) (16 ) — (71 ) Total other income (expense), net 17 (5 ) (56 ) 8 (31 ) (67 ) Net Income (Loss) 17 (4 ) 18 6 (31 ) 6 Less: Net loss attributable to noncontrolling interests — — — (11 ) — (11 ) Net Income (Loss) Attributable to NRG Yield LLC $ 17 $ (4 ) $ 18 $ 17 $ (31 ) $ 17 (a) All significant intercompany transactions have been eliminated in consolidation.

Nature of Business (Details)

Nature of Business (Details) $ in Millions		Mar. 27, 2017USD ($)	Mar. 31, 2017USD ($)MW	Mar. 31, 2016USD ($)
Nature of Business
Megawatts Thermal Equivalent, Available Under right-to-use Provisions			134
Power Generation Capacity, Megawatts	[1],[2]		5,002
Weighted Average Remaining PPA Term			16 years
Proceeds from the issuance of Class C units | $			$ 5	$ 0
Power Generation Capacity, Megawatts, including portion attributable to noncontrolling interest			5,008
Conventional Generation, Utility-Scale Solar, Distributed Solar, and Wind [Member]
Nature of Business
Power Generation Capacity, Megawatts			4,879
Distributed Solar
Nature of Business
Power Generation Capacity, Megawatts	[2]		14
Wind Farms [Member]
Nature of Business
Power Generation Capacity, Megawatts	[2]		1,999
Thermal [Member]
Nature of Business
Percentage of Ownership	[3]		100.00%
Steam and Chilled Water Capacity, Megawatts Thermal Equivalent	[2],[3]		1,319
Power Generation Capacity, Megawatts			123
Power Generation Capacity, Megawatts and Megawatt Thermal Equivalent			1,442
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 | $			$ 5
NRG Yield LLC | NRG
Nature of Business
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest			55.10%
NRG Yield LLC | NRG Yield, Inc. [Member]
Nature of Business
Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest			44.90%
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			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%
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	[4]		50.00%
Power Generation Capacity, Megawatts	[2],[4]		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	[5]		100.00%
Power Generation Capacity, Megawatts	[2],[5]		137
Alta XI [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[5]		100.00%
Power Generation Capacity, Megawatts	[2],[5]		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			75.00%
Power Generation Capacity, Megawatts	[2]		14
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	[5]		90.10%
Power Generation Capacity, Megawatts	[2],[5]		29
Spring Canyon III [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership	[5]		90.10%
Power Generation Capacity, Megawatts	[2],[5]		25
Crosswinds [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			74.30%
Power Generation Capacity, Megawatts	[2]		16
Elbow Creek [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			75.00%
Power Generation Capacity, Megawatts	[2]		92
Elkhorn Ridge Wind, LLC [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			50.30%
Power Generation Capacity, Megawatts	[2]		41
Forward [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			75.00%
Power Generation Capacity, Megawatts	[2]		22
Goat Wind [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			74.90%
Power Generation Capacity, Megawatts	[2]		113
Hardin [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			74.30%
Power Generation Capacity, Megawatts	[2]		11
Lookout [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			75.00%
Power Generation Capacity, Megawatts	[2]		29
Odin Wind Farm [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			74.90%
Power Generation Capacity, Megawatts	[2]		15
San Juan Mesa Wind Project, LLC [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			56.30%
Power Generation Capacity, Megawatts	[2]		68
Sleeping Bear [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			75.00%
Power Generation Capacity, Megawatts	[2]		71
Wildorado [Member] | Wind Farms [Member]
Nature of Business
Percentage of Ownership			74.90%
Power Generation Capacity, Megawatts	[2]		121
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
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%
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 | $		$ 1
[1]	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 5,008 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 March 31, 2017.
[3]	(c) 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.
[4]	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).
[5]	(b) Projects are part of tax equity arrangements.

Summary of Significant Accoun27

Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016		Dec. 31, 2016		Dec. 31, 2015	[2]	Sep. 30, 2015	[2]	Jun. 30, 2015
Summary of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 210			$ 321	[1]	$ 110		$ 75		$ 75
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	1,025			951
Noncontrolling interest	313			313
Capital contributions from tax equity investors, net of distributions	14	$ 10
Distributions to NRG for NRG Wind TE Holdco	(38)	(11)	[2]
Comprehensive loss	$ (9)	$ (12)	[3]
Dividends Payable, Date Declared	Apr. 25, 2017
Common Stock, Dividends, Per Share, Declared	$ 0.27
Dividends Payable, Date to be Paid	Jun. 15, 2017
Dividends Payable, Date of Record	Jun. 1, 2017
Intangible assets, accumulated amortization	$ 181			163
Restricted cash	106			$ 165	[1]
Financial Institutions [Member]
Summary of Significant Accounting Policies [Line Items]
Capital contributions from tax equity investors, net of distributions	14
November 2015 Drop Down Assets [Member]
Summary of Significant Accounting Policies [Line Items]
Distributions to NRG for NRG Wind TE Holdco	$ (5)
Common Class A [Member]
Summary of Significant Accounting Policies [Line Items]
Dividends Per Class A Common Share	$ 0.26
[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.

Variable Interest Entities Vari

Variable Interest Entities Variable Interest Entities - March 2017 Drop Down Assets (Details) $ in Millions		Mar. 27, 2017USD ($)	Feb. 24, 2017MW	Mar. 31, 2017USD ($)MW	Dec. 31, 2016USD ($)
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW	[1],[2]			5,002
Long-term Debt				$ 6,036	$ 6,069
Agua Caliente [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		16.00%
Long-term Debt				$ 846
Agua Caliente Borrower 2 [Member]
Schedule of Equity Method Investments [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
Pro-Rate Share of Debt Held by Unconsolidated Affiliates		$ 135
Utah Portfolio [Member]
Schedule of Equity Method Investments [Line Items]
Remaining Power Purchase Agreement term			20 years
Percentage of Cash Available for Distributions				50.00%
March 2017 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Debt Issuance Costs, Noncurrent, Net		8
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents		6
Business Combination, Consideration Transferred		130
Business Acquisition, Consideration Transferred, Working Capital		1
Long-term Debt	[3]	320
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Equity Method Investments		456
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets		462
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Current and Non-Current Liabilities		3
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities		323
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net		$ 139
NRG [Member] | Agua Caliente Borrower 2 [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Ownership			51.00%
NRG [Member] | Utah Portfolio [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Cash Available for Distributions			50.00%
[1]	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 5,008 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 March 31, 2017.
[3]	Net of $8 million of debt issuance costs.

Variable Interest Entities Va29

Variable Interest Entities Variable Interest Entities - Consolidated Entities (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016	[1]
Schedule of Equity Method Investments [Line Items]
Total other assets	$ 2,500	$ 2,504
Net property, plant and equipment	5,390	5,460
Total Assets	8,366	8,620
Liabilities	6,258	$ 6,316
November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	193
Net property, plant and equipment	435
Intangible Assets, Net (Excluding Goodwill)	2
Total Assets	630
Liabilities	210
Noncontrolling Interest in Variable Interest Entity	141
Net Assets	279
Alta X and XI TE Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	18
Net property, plant and equipment	455
Intangible Assets, Net (Excluding Goodwill)	271
Total Assets	744
Liabilities	8
Noncontrolling Interest in Variable Interest Entity	106
Net Assets	630
Spring Canyon [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	4
Net property, plant and equipment	99
Intangible Assets, Net (Excluding Goodwill)	0
Total Assets	103
Liabilities	6
Noncontrolling Interest in Variable Interest Entity	66
Net Assets	$ 31
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Va30

Variable Interest Entities Variable Interest Entities - Unconsolidated Entities (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016		Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Total operating revenues	$ 218	$ 234	[1],[2]
Equity investments in affiliates	1,154			$ 1,152	[3]
Operating income (loss)	54	73	[2]
Net Income (Loss)	1	6	[1],[2],[4]
Total current assets	476			656	[3]
Current Liabilities	454			471	[3]
Total non-current liabilities	5,804			5,845	[3]
Utah Portfolio [Member]
Schedule of Equity Method Investments [Line Items]
Total operating revenues	13	0
Operating income (loss)	(2)	0
Net Income (Loss)	(2)	0
Total current assets	15			20
Assets, Noncurrent	1,109			1,105
Current Liabilities	3			14
Total non-current liabilities	21			38
Four Brothers Solar [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	228
Granite Mountain Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	81
Iron Springs Holdings [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	54
NRG DGPV Holdco 1 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	73
NRG DGPV Holdco 2 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	34
NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	70
Gen Conn Energy LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates	104
GCE Holding LLC [Member]
Schedule of Equity Method Investments [Line Items]
Total operating revenues	17	18
Operating income (loss)	9	9
Net Income (Loss)	6	$ 7
Total current assets	29			36
Assets, Noncurrent	385			389
Current Liabilities	12			16
Total non-current liabilities	$ 193			$ 196
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Va31

Variable Interest Entities Variable Interest Entities - Utah Solar Portfolio (Details) - Utah Portfolio [Member]	Mar. 31, 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 Va32

Variable Interest Entities Variable Interest Entities - Debt Held by Unconsolidated Affiliates (Details) - USD ($) $ in Millions	Mar. 31, 2017	Mar. 27, 2017	Dec. 31, 2016
Schedule of Equity Method Investments [Line Items]
Long-term Debt	$ 6,036		$ 6,069
Agua Caliente Borrower 2 [Member]
Schedule of Equity Method Investments [Line Items]
Pro-Rate Share of Debt Held by Unconsolidated Affiliates		$ 135
Agua Caliente [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		16.00%
Long-term Debt	$ 846

Fair Value of Financial Instr33

Fair Value of Financial Instruments Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Millions	Mar. 31, 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	25	30
Long-term debt — affiliate	618
Long-term Debt and Capital Lease Obligations, Including Current Maturities	5,418	5,451
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Net	25	30
Long-term debt — affiliate	613	608
Long-term Debt and Capital Lease Obligations, Including Current Maturities	5,413	5,435
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	844	833
Fair Value, Inputs, Level 3 [Member] | Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	$ 5,182	$ 5,210
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Fair Value of Financial Instr34

Fair Value of Financial Instruments Fair Value of Financial Instruments - Recurring Fair Value (Details) - USD ($)		Mar. 31, 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	$ 3,000,000
Derivative Liability, Fair Value, Gross Liability		68,000,000	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]	3,000,000	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]	68,000,000	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		2,000,000	1,000,000
Derivative Liability, Fair Value, Gross Liability		66,000,000	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]	2,000,000	1,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	66,000,000	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		1,000,000	2,000,000
Derivative Liability, Fair Value, Gross Liability		2,000,000	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]	1,000,000	1,000,000
Derivative Liability, Fair Value, Gross Liability	[1]	$ 2,000,000	$ 1,000,000
[1]	There were no derivative assets or liabilities classified as Level 1 as of March 31, 2017. There were no derivative assets or liabilities classified as Level 3 as of March 31, 2017 and December 31, 2016.

Fair Value of Financial Instr35

Fair Value of Financial Instruments Fair Value of Financial Instruments - Credit Risk and Derivative FV Measurements (Details) $ in Millions	3 Months Ended
	Mar. 31, 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	$ 3,000
Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period	5 years

Accounting for Derivative Ins36

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($) $ in Millions	Mar. 31, 2017	Dec. 31, 2016
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 3	$ 3
Derivative Liability, Fair Value, Gross Liability	68	76
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Derivative Asset	1
Fair Value of Gross Derivative Assets/(Liabilities), Net	(65)	(73)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(65)	(73)
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	1
Derivative Liability, Fair Value, Gross Liability	49	65
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	2
Derivative Liability, Fair Value, Gross Liability	19	11
Commodity Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	2
Derivative Liability, Fair Value, Gross Liability	2	1
Derivative Asset, Fair Value, Gross Liability	0	0
Derivative Asset	1	2
Derivative Liability, Fair Value, Gross Asset	0	0
Derivative Liability	2	1
Fair Value of Gross Derivative Assets/(Liabilities), Net	(1)	1
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(1)	1
Interest Rate Contract Current [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	20	26
Interest Rate Contract Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0	0
Derivative Liability, Fair Value, Gross Liability	7	5
Interest Rate Contract Non Current [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	1
Derivative Liability, Fair Value, Gross Liability	29	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	0
Derivative Liability, Fair Value, Gross Liability	10	5
Commodity Contract Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1	2
Derivative Liability, Fair Value, Gross Liability	1	1
Interest Rate Contract [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	2	1
Derivative Liability, Fair Value, Gross Liability	66	75
Derivative Asset, Fair Value, Gross Liability	1	1
Derivative Asset	1	0
Derivative Liability, Fair Value, Gross Asset	1	1
Derivative Liability	65	74
Fair Value of Gross Derivative Assets/(Liabilities), Net	(64)	(74)
Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset	0	0
Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral	(64)	(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	0
United States of America, Dollars | Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	2,028	2,070
MMbtu [Member] | Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 2	$ 3

Accounting for Derivative Ins37

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - AOCI (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Sep. 30, 2015
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (79)		$ (86)	$ (99)	$ (149)
Mark-to-market of cash flow hedge accounting contracts	2	$ (54)
Losses expected to be realized from OCL during the next 12 months	(18)
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net	0	0
Reclassification out of Accumulated Other Comprehensive Income [Member]
Derivative [Line Items]
Reclassified from accumulated OCL to income due to realization of previously deferred amounts	5	$ 4
Noncontrolling Interest [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	(3)		(4)
Successor [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (76)		$ (145)

Accounting for Derivative Ins38

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - Impact on Statement of Operations (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	$ 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		3 Months Ended
		Dec. 31, 2016		Mar. 31, 2017
Debt Instrument [Line Items]
Long-term debt — affiliate		$ 618	[1]	$ 618
Long-term Debt		6,069		6,036
Current portion of long-term debt — external		(291)	[1]	(296)
Deferred Finance Costs, Net		(62)		(61)
Long-term Debt, Excluding Current Maturities		5,716		5,679
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				5.00%
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	[3]			1 month LIBOR
Debt Instrument, Basis Spread on Variable Rate				2.75%
Aqua Caliente Borrower 2, due 2038 [Member]
Debt Instrument [Line Items]
Long-term Debt		0		$ 41
Debt Instrument, Interest Rate, Stated Percentage				5.43%
Alta Wind I, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Long-term Debt		242		$ 242
Debt Instrument, Interest Rate, Stated Percentage	[2]			7.015%
Alta Wind II, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Long-term Debt		191		$ 191
Debt Instrument, Interest Rate, Stated Percentage	[2]			5.696%
Alta Wind III, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Long-term Debt		198		$ 198
Debt Instrument, Interest Rate, Stated Percentage	[2]			6.067%
Alta Wind IV, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Long-term Debt		128		$ 128
Debt Instrument, Interest Rate, Stated Percentage	[2]			5.938%
Alta Wind V, lease financing arrangement, due 2035 [Member]
Debt Instrument [Line Items]
Long-term Debt		206		$ 206
Debt Instrument, Interest Rate, Stated Percentage	[2]			6.071%
Alta Realty Investments, due 2031 [Member]
Debt Instrument [Line Items]
Long-term Debt		31		$ 31
Debt Instrument, Interest Rate, Stated Percentage	[2]			7.00%
Alta Wind Asset Management, due 2031 [Member]
Debt Instrument [Line Items]
Long-term Debt		18		$ 18
Debt Instrument, Description of Variable Rate Basis				3 month LIBOR
Debt Instrument, Basis Spread on Variable Rate				2.375%
West Holdings Credit Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt		443		$ 414
Debt Instrument, Description of Variable Rate Basis				3 month LIBOR
West Holdings Credit Agreement due 2023 Tranche A [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				1.625%
Marsh Landing Term Loan Facility [Member]
Debt Instrument [Line Items]
Long-term Debt		370		$ 361
Walnut Creek Energy, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt		310		$ 303
Debt Instrument, Description of Variable Rate Basis				1 month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.625%
Tapestry Wind LLC due in 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt		172		$ 168
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.625%
Viento Funding II, Inc., due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt		178		$ 178
Debt Instrument, Description of Variable Rate Basis				1-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				2.75%
NRG Energy Center Minneapolis LLC Senior Secured Notes [Member]
Debt Instrument [Line Items]
Long-term Debt		96		$ 94
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		$ 98
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.875%
South Trent Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt		57		$ 57
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.625%
Avra Valley Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt		57		$ 56
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.75%
High Desert Facility [Member]
Debt Instrument [Line Items]
Long-term Debt		49		$ 49
WCEP Holdings, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt		46		$ 46
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				3.00%
Roadrunner Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt		37		$ 37
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.625%
Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt		287		$ 287
Debt Instrument, Description of Variable Rate Basis				1-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				2.625%
Proceeds from Issuance of Debt		65
Kansas South Facility, due 2031 [Member]
Debt Instrument [Line Items]
Long-term Debt		30		$ 30
Debt Instrument, Description of Variable Rate Basis				6-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				2.00%
NRG Solar Blythe LLC Credit Agreement Due 2028 [Member]
Debt Instrument [Line Items]
Long-term Debt		19		$ 19
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.625%
PFMG Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt		27		$ 27
Debt Instrument, Interest Rate, Stated Percentage	[2]			6.00%
Project [Domain]
Debt Instrument [Line Items]
Long-term Debt		4,601		$ 4,568
West Holdings Credit Agreement due 2023 Tranche B [Member]
Debt Instrument [Line Items]
Debt Instrument, Basis Spread on Variable Rate				2.25%
Marsh Landing Tranche A due December 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis				1 month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.75%
Marsh Landing Tranche B due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis				1 month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.875%
Alpine Financing Agreement, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt		145		$ 144
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				1.75%
NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2017 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.95%
NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2025 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				7.25%
Borrego Financing Agreement, due 2024 [Member]
Debt Instrument [Line Items]
Long-term Debt		69		$ 69
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				2.50%
CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt		771		$ 757
CVSR Holdco due 2037 [Member]
Debt Instrument [Line Items]
Long-term Debt		$ 199		$ 194
Debt Instrument, Interest Rate, Stated Percentage	[2]			4.68%
Borrego Financing Agreement, due 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.65%
High Desert Facility, due 2033 [Member]
Debt Instrument [Line Items]
Debt Instrument, Description of Variable Rate Basis				3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate				2.50%
TA - High Desert, due 2023 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				5.15%
Letter of Credit [Member] | NRG Yield Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	[3]			$ 64
Letter of Credit [Member] | Aqua Caliente Borrower 2, due 2038 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				17
Letter of Credit [Member] | Alta Wind I, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				16
Letter of Credit [Member] | Alta Wind II, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				27
Letter of Credit [Member] | Alta Wind III, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				27
Letter of Credit [Member] | Alta Wind IV, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				19
Letter of Credit [Member] | Alta Wind V, lease financing arrangement, due 2035 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				30
Letter of Credit [Member] | Alta Realty Investments, due 2031 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				0
Letter of Credit [Member] | Alta Wind Asset Management, due 2031 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				0
Letter of Credit [Member] | West Holdings Credit Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				82
Letter of Credit [Member] | Marsh Landing Term Loan Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				37
Letter of Credit [Member] | Walnut Creek Energy, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				52
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] | South Trent Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				10
Letter of Credit [Member] | Avra Valley Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				3
Letter of Credit [Member] | High Desert Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				0
Letter of Credit [Member] | WCEP Holdings LLC [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				0
Letter of Credit [Member] | Roadrunner Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				5
Letter of Credit [Member] | Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				11
Letter of Credit [Member] | Kansas South Facility, due 2031 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				4
Letter of Credit [Member] | NRG Solar Blythe LLC Credit Agreement Due 2028 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				2
Letter of Credit [Member] | PFMG Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				0
Letter of Credit [Member] | Alpine Financing Agreement, due 2022 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				37
Letter of Credit [Member] | Borrego Financing Agreement, due 2024 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount				5
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] | CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				2.339%
Maximum [Member] | CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage				3.775%
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	As of March 31, 2017, L+ equals 3 month LIBOR plus x%, except for the Alpine term loan, Marsh Landing term loan, Utah Solar Portfolio, Viento, Walnut Creek term loan, and NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, where L+ equals 1 month LIBOR plus x% and Kansas South, where L+ equals 6 month LIBOR plus x%.
[3]	{F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmVlYzVkMmZmM2Q2MzRmYjlhNDlhODY1NDQxNzVhN2JmfFRleHRTZWxlY3Rpb246MkE1QTk4QzlGOUM0NzkyQUNGMTI4QUExRTZBNDkxMTkM}

Long-term Debt Long-term Debt40

Long-term Debt Long-term Debt - Debt Disclosures (Details) - USD ($) $ in Millions		2 Months Ended	3 Months Ended
		Dec. 31, 2016	Mar. 31, 2017	Mar. 16, 2017	Nov. 02, 2016
Debt Instrument [Line Items]
Long-term Debt		$ 6,069	$ 6,036
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			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
Aqua Caliente Borrower 2, due 2038 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage			5.43%
Long-term Debt		0	$ 41
Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Long-term Debt		287	$ 287
Debt Instrument, Basis Spread on Variable Rate			2.625%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt					$ 222
Proceeds from Issuance of Debt		$ 65
Letter of Credit [Member] | NRG Yield Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount	[1]		$ 64
Letter of Credit [Member] | Aqua Caliente Borrower 2, due 2038 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			17
Letter of Credit [Member] | Utah Solar Portfolio, due 2022 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount			$ 11
[1]	{F|ahBzfndlYmZpbGluZ3MtaHJkcmoLEgZYTUxEb2MiXlhCUkxEb2NHZW5JbmZvOmVlYzVkMmZmM2Q2MzRmYjlhNDlhODY1NDQxNzVhN2JmfFRleHRTZWxlY3Rpb246MkE1QTk4QzlGOUM0NzkyQUNGMTI4QUExRTZBNDkxMTkM}

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016		Dec. 31, 2016	[4]
Segment Reporting
Operating revenues	$ 218	$ 234	[1],[2]
Cost of operations	84	85	[2]
Depreciation and amortization	75	74	[1],[2]
General and administrative	4	2	[1],[2]
Business Combination, Acquisition Related Costs	1	0	[1]
Operating Income	54	73	[2]
Equity in earnings of unconsolidated affiliates	19	4	[1],[2],[3]
Other income, net	1	0	[1]
Interest expense	(73)	(71)	[1],[2]
Net Income	1	6	[1],[2],[3]
Total Assets	8,366			$ 8,620
Conventional Generation [Member]
Segment Reporting
Operating revenues	75	79	[2]
Cost of operations	22	23	[2]
Depreciation and amortization	24	20	[2]
General and administrative	0	0	[2]
Business Combination, Acquisition Related Costs	0
Operating Income	29	36	[2]
Equity in earnings of unconsolidated affiliates	3	3	[2]
Other income, net	0
Interest expense	(12)	(11)	[2]
Net Income	20	28	[2]
Total Assets	1,937
Corporate
Segment Reporting
Operating revenues	0	0	[2]
Cost of operations	0	0	[2]
Depreciation and amortization	0	0	[2]
General and administrative	4	2	[2]
Business Combination, Acquisition Related Costs	1
Operating Income	(5)	(2)	[2]
Equity in earnings of unconsolidated affiliates	0	0	[2]
Other income, net	0
Interest expense	(18)	(16)	[2]
Net Income	(23)	(18)	[2]
Total Assets	97
Thermal [Member]
Segment Reporting
Operating revenues	44	44	[2]
Cost of operations	30	29	[2]
Depreciation and amortization	5	5	[2]
General and administrative	0	0	[2]
Business Combination, Acquisition Related Costs	0
Operating Income	9	10	[2]
Equity in earnings of unconsolidated affiliates	0	0	[2]
Other income, net	0
Interest expense	(3)	(2)	[2]
Net Income	6	8	[2]
Total Assets	431
Renewables
Segment Reporting
Operating revenues	99	111	[2]
Cost of operations	32	33	[2]
Depreciation and amortization	46	49	[2]
General and administrative	0	0	[2]
Business Combination, Acquisition Related Costs	0
Operating Income	21	29	[2]
Equity in earnings of unconsolidated affiliates	16	1	[2]
Other income, net	1
Interest expense	(40)	(42)	[2]
Net Income	(2)	$ (12)	[2]
Total Assets	$ 5,901
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(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
	Mar. 31, 2017	Mar. 31, 2016		Dec. 31, 2016
Related Party Transaction
General and administrative	$ 4	$ 2	[1],[2]
Accounts payable — affiliate	50			$ 40	[3]
Due to Affiliate, Noncurrent	618			618	[3]
GenOn Energy Services LLC [Member]
Related Party Transaction
Due to Affiliate	1
NRG RENOM [Member]
Related Party Transaction
Due to Affiliate	3			5
Related Party Transaction, Expenses from Transactions with Related Party	3	2
NRG Yield [Member] | NRG [Member]
Related Party Transaction
General and administrative	2	2
NRG Yield [Member] | NRG [Member] | Scenario, Plan [Member]
Related Party Transaction
Management Services Fee, Annual	8
NRG Yield, Inc. [Member] | NRG [Member]
Related Party Transaction
Due to Affiliate	2
Elbow Creek [Member] | NRG [Member]
Related Party Transaction
Revenues	3	3
Thermal [Member] | NRG [Member]
Related Party Transaction
Due to Affiliate	19			$ 20
Accounts payable — affiliate	13
Due to Affiliate, Noncurrent	6
Related Party Transaction, Expenses from Transactions with Related Party	8	7
NRG Energy Center Minneapolis LLC [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party	4	3
Marsh Landing [Member] | GenOn Energy Services LLC [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party	$ 3	$ 2
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidating Finan43

Condensed Consolidating Financial Information CP Income Statement (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2016
Condensed Income Statements, Captions [Line Items]
Total operating revenues		$ 218		$ 234	[1],[2]
Operating Costs and Expenses [Abstract]
Cost of operations		84		85	[1]
Depreciation and amortization		75		74	[1],[2]
General and administrative		4		2	[1],[2]
Business Combination, Acquisition Related Costs		1		0	[1]
Total operating costs and expenses		164		161	[1]
Operating income (loss)		54		73	[2]
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		0		0
Equity in earnings of unconsolidated affiliates		19		4	[1],[2],[3]
Other income, net		1		0	[1]
Interest expense		73		71	[1],[2]
Total other income (expense), net		(53)		(67)	[1]
Net Income (Loss)		1		6	[1],[2],[3]
Less: Net loss attributable to noncontrolling interests		(9)		(11)	[1]
Net Income Attributable to NRG Yield LLC		10		17	[1]
NRG Yield LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0
Operating Costs and Expenses [Abstract]
Cost of operations		0		0
Depreciation and amortization		0		0
General and administrative		0		0
Business Combination, Acquisition Related Costs		0
Total operating costs and expenses		0		0
Operating income (loss)		0		0
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		10		17
Equity in earnings of unconsolidated affiliates		0		0
Other income, net		0
Interest expense		0		0
Total other income (expense), net		10		17
Net Income (Loss)		10		17
Less: Net loss attributable to noncontrolling interests		0		0
Net Income Attributable to NRG Yield LLC		10		17
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		5		5
Operating Costs and Expenses [Abstract]
Cost of operations		4		3
Depreciation and amortization		1		1
General and administrative		0		0
Business Combination, Acquisition Related Costs		0
Total operating costs and expenses		5		4
Operating income (loss)		0		1
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		(11)		(7)
Equity in earnings of unconsolidated affiliates		2		2
Other income, net		0
Interest expense		0		0
Total other income (expense), net		(9)		(5)
Net Income (Loss)		(9)		(4)
Less: Net loss attributable to noncontrolling interests		0		0
Net Income Attributable to NRG Yield LLC		(9)		(4)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		213		229
Operating Costs and Expenses [Abstract]
Cost of operations		80		82
Depreciation and amortization		74		73
General and administrative		0		0
Business Combination, Acquisition Related Costs		0
Total operating costs and expenses		154		155
Operating income (loss)		59		74
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		0		0
Equity in earnings of unconsolidated affiliates		16		(1)
Other income, net		1
Interest expense		55		55
Total other income (expense), net		(38)		(56)
Net Income (Loss)		21		18
Less: Net loss attributable to noncontrolling interests		(1)		0
Net Income Attributable to NRG Yield LLC		22		18
NRG Yield Operating LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0
Operating Costs and Expenses [Abstract]
Cost of operations		0		0
Depreciation and amortization		0		0
General and administrative		4		2
Business Combination, Acquisition Related Costs		1
Total operating costs and expenses		5		2
Operating income (loss)		(5)		(2)
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		23		21
Equity in earnings of unconsolidated affiliates		1		3
Other income, net		0
Interest expense		18		16
Total other income (expense), net		6		8
Net Income (Loss)		1		6
Less: Net loss attributable to noncontrolling interests		(9)		(11)
Net Income Attributable to NRG Yield LLC		10		17
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0	[4]	0	[5]
Operating Costs and Expenses [Abstract]
Cost of operations		0	[4]	0	[5]
Depreciation and amortization		0	[4]	0	[5]
General and administrative		0	[4]	0	[5]
Business Combination, Acquisition Related Costs	[4]	0
Total operating costs and expenses		0	[4]	0	[5]
Operating income (loss)		0	[4]	0	[5]
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		(22)	[4]	(31)	[5]
Equity in earnings of unconsolidated affiliates		0	[4]	0	[5]
Other income, net	[4]	0
Interest expense		0	[4]	0	[5]
Total other income (expense), net		(22)	[4]	(31)	[5]
Net Income (Loss)		(22)		(31)	[5]
Less: Net loss attributable to noncontrolling interests		1	[4]	0	[5]
Net Income Attributable to NRG Yield LLC		(23)	[4]	$ (31)	[5]
5.00% Senior Notes due in 2026 [Member]
Condensed Income Statements, Captions [Line Items]
Senior Notes		$ 350				$ 350
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	All significant intercompany transactions have been eliminated in consolidation.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan44

Condensed Consolidating Financial Information CP Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	$ 1		$ 6	[1],[2],[3]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		(50)	[4]
Other Comprehensive Income (Loss), Net of Tax	7		(50)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	8		(44)	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(9)		(12)	[4]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	17		(32)	[4]
NRG Yield LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	10		17
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		(49)
Other Comprehensive Income (Loss), Net of Tax	7		(49)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	17		(32)
Less: Comprehensive loss attributable to noncontrolling interests	0		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	17		(32)
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(9)		(4)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0		(1)
Other Comprehensive Income (Loss), Net of Tax	0		(1)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(9)		(5)
Less: Comprehensive loss attributable to noncontrolling interests	0		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	(9)		(5)
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	21		18
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	6		(46)
Other Comprehensive Income (Loss), Net of Tax	6		(46)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	27		(28)
Less: Comprehensive loss attributable to noncontrolling interests	(1)		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	28		(28)
NRG Yield Operating LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	1		6
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		(50)
Other Comprehensive Income (Loss), Net of Tax	7		(50)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	8		(44)
Less: Comprehensive loss attributable to noncontrolling interests	(9)		(12)
Comprehensive Income (Loss) Attributable to NRG Yield LLC	17		(32)
Consolidation, Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(22)		(31)	[5]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(13)	[6]	96
Other Comprehensive Income (Loss), Net of Tax	(13)	[6]	96
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(35)	[6]	65
Less: Comprehensive loss attributable to noncontrolling interests	1		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	$ (36)		$ 65
[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]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.
[6]	All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan45

Condensed Consolidating Financial Information CP Balance Sheet (Details) - USD ($)		Mar. 31, 2017		Dec. 31, 2016		Dec. 31, 2015		Sep. 30, 2015	[2]	Jun. 30, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		$ 210,000,000		$ 321,000,000	[1]	$ 110,000,000	[2]	$ 75,000,000		$ 75,000,000
Restricted cash		106,000,000		165,000,000	[1]
Accounts receivable — trade		82,000,000		92,000,000	[1]
Accounts receivable — affiliate		3,000,000		1,000,000	[1]
Inventory		40,000,000		39,000,000	[1]
Derivative Asset		1,000,000
Notes receivable		15,000,000		16,000,000	[1]
Prepayments and other current assets		19,000,000		20,000,000	[1]
Total current assets		476,000,000		656,000,000	[1]
Net property, plant and equipment		5,390,000,000		5,460,000,000	[1]
Investment in consolidated subsidiaries		0		0
Equity investments in affiliates		1,154,000,000		1,152,000,000	[1]
Notes receivable		10,000,000		14,000,000	[1]
Intangible assets, net		1,268,000,000		1,286,000,000	[1]
Derivative Asset, Noncurrent		2,000,000		1,000,000
Other non-current assets		66,000,000		51,000,000	[1]
Total other assets		2,500,000,000		2,504,000,000	[1]
Total Assets		8,366,000,000		8,620,000,000	[1]
Current portion of long-term debt — external		296,000,000		291,000,000	[1]
Accounts payable — trade		26,000,000		23,000,000	[1]
Accounts payable — affiliate		50,000,000		40,000,000	[1]
Derivative instruments		28,000,000		32,000,000	[1]
Accrued expenses and other current liabilities		54,000,000		85,000,000	[1]
Current Liabilities		454,000,000		471,000,000	[1]
Other Liabilities
Long-term debt — external		5,061,000,000		5,098,000,000	[1]
Long-term debt — affiliate		618,000,000		618,000,000	[1]
Due to Related Parties, Noncurrent		6,000,000		9,000,000	[1]
Derivative instruments		40,000,000		44,000,000	[1]
Other non-current liabilities		79,000,000		76,000,000	[1]
Total non-current liabilities		5,804,000,000		5,845,000,000	[1]
Total Liabilities		6,258,000,000		6,316,000,000	[1]
Commitments and Contingencies		0		0
Contributed capital		1,865,000,000		1,995,000,000	[1]
Retained earnings		6,000,000		79,000,000	[1]
Noncontrolling interest		313,000,000		313,000,000	[1]
Accumulated other comprehensive loss		(76,000,000)		(83,000,000)	[1]
Stockholders' Equity Attributable to Noncontrolling Interest		313,000,000		313,000,000
Total Members' Equity		2,108,000,000		2,304,000,000	[1]
Total Liabilities and Members’ Equity		8,366,000,000		8,620,000,000	[1]
NRG Yield LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		93,000,000		211,000,000		15,000,000				10,000,000
Restricted cash		0		0
Accounts receivable — trade		0		0
Accounts receivable — affiliate		3,000,000		0
Inventory		0		0
Derivative Asset		0
Notes receivable		0		0
Prepayments and other current assets		0		0
Total current assets		96,000,000		211,000,000
Net property, plant and equipment		0		0
Investment in consolidated subsidiaries		1,699,000,000		1,780,000,000
Equity investments in affiliates		0		0
Notes receivable		0		0
Intangible assets, net		0		0
Derivative Asset, Noncurrent		0
Other non-current assets		0		0
Total other assets		1,699,000,000		1,780,000,000
Total Assets		1,795,000,000		1,991,000,000
Current portion of long-term debt — external		0		0
Accounts payable — trade		0		0
Accounts payable — affiliate		0		0
Derivative instruments		0		0
Accrued expenses and other current liabilities		0		0
Current Liabilities		0		0
Other Liabilities
Long-term debt — external		0		0
Long-term debt — affiliate		0		0
Due to Related Parties, Noncurrent		0
Derivative instruments		0		0
Other non-current liabilities		0		0
Total non-current liabilities		0		0
Total Liabilities		0		0
Contributed capital		1,865,000,000		1,995,000,000
Retained earnings		6,000,000		79,000,000
Accumulated other comprehensive loss		(76,000,000)		(83,000,000)
Stockholders' Equity Attributable to Noncontrolling Interest		0		0
Total Members' Equity		1,795,000,000		1,991,000,000
Total Liabilities and Members’ Equity		1,795,000,000		1,991,000,000
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0		0		0				0
Restricted cash		0		0
Accounts receivable — trade		2,000,000		2,000,000
Accounts receivable — affiliate		0		0
Inventory		1,000,000		2,000,000
Derivative Asset		0
Notes receivable		0		0
Prepayments and other current assets		0		0
Total current assets		3,000,000		4,000,000
Net property, plant and equipment		58,000,000		59,000,000
Investment in consolidated subsidiaries		483,000,000		527,000,000
Equity investments in affiliates		177,000,000		171,000,000
Notes receivable		0		0
Intangible assets, net		55,000,000		56,000,000
Derivative Asset, Noncurrent		0
Other non-current assets		0		0
Total other assets		715,000,000		754,000,000
Total Assets		776,000,000		817,000,000
Current portion of long-term debt — external		0		0
Accounts payable — trade		1,000,000		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		7,000,000		10,000,000
Other Liabilities
Long-term debt — external		0		0
Long-term debt — affiliate		0		0
Due to Related Parties, Noncurrent		0
Derivative instruments		0		0
Other non-current liabilities		0		0
Total non-current liabilities		0		0
Total Liabilities		7,000,000		10,000,000
Contributed capital		845,000,000		874,000,000
Retained earnings		(74,000,000)		(65,000,000)
Accumulated other comprehensive loss		(2,000,000)		(2,000,000)
Stockholders' Equity Attributable to Noncontrolling Interest		0		0
Total Members' Equity		769,000,000		807,000,000
Total Liabilities and Members’ Equity		776,000,000		817,000,000
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		117,000,000		110,000,000		95,000,000				65,000,000
Restricted cash		106,000,000		165,000,000
Accounts receivable — trade		80,000,000		90,000,000
Accounts receivable — affiliate		0		1,000,000
Inventory		39,000,000		37,000,000
Derivative Asset		1,000,000
Notes receivable		15,000,000		16,000,000
Prepayments and other current assets		19,000,000		19,000,000
Total current assets		377,000,000		440,000,000
Net property, plant and equipment		5,332,000,000		5,401,000,000
Investment in consolidated subsidiaries		0		0
Equity investments in affiliates		610,000,000		600,000,000
Notes receivable		10,000,000		14,000,000
Intangible assets, net		1,213,000,000		1,230,000,000
Derivative Asset, Noncurrent		2,000,000
Other non-current assets		65,000,000		50,000,000
Total other assets		1,900,000,000		1,895,000,000
Total Assets		7,609,000,000		7,736,000,000
Current portion of long-term debt — external		296,000,000		291,000,000
Accounts payable — trade		25,000,000		18,000,000
Accounts payable — affiliate		23,000,000		15,000,000
Derivative instruments		28,000,000		32,000,000
Accrued expenses and other current liabilities		42,000,000		60,000,000
Current Liabilities		414,000,000		416,000,000
Other Liabilities
Long-term debt — external		4,222,000,000		4,259,000,000
Long-term debt — affiliate		0		0
Due to Related Parties, Noncurrent		6,000,000
Derivative instruments		40,000,000		44,000,000
Other non-current liabilities		79,000,000		76,000,000
Total non-current liabilities		4,347,000,000		4,388,000,000
Total Liabilities		4,761,000,000		4,804,000,000
Contributed capital		2,856,000,000		2,920,000,000
Retained earnings		11,000,000		35,000,000
Accumulated other comprehensive loss		(81,000,000)		(87,000,000)
Stockholders' Equity Attributable to Noncontrolling Interest		62,000,000		64,000,000
Total Members' Equity		2,848,000,000		2,932,000,000
Total Liabilities and Members’ Equity		7,609,000,000		7,736,000,000
NRG Yield Operating LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0		0		$ 0				$ 0
Restricted cash		0		0
Accounts receivable — trade		0		0
Accounts receivable — affiliate		0		0
Inventory		0		0
Derivative Asset		0
Notes receivable		0		0
Prepayments and other current assets		0		1,000,000
Total current assets		0		1,000,000
Net property, plant and equipment		0		0
Investment in consolidated subsidiaries		3,134,000,000		3,212,000,000
Equity investments in affiliates		367,000,000		381,000,000
Notes receivable		0		0
Intangible assets, net		0		0
Derivative Asset, Noncurrent		0
Other non-current assets		1,000,000		1,000,000
Total other assets		3,502,000,000		3,594,000,000
Total Assets		3,502,000,000		3,595,000,000
Current portion of long-term debt — external		0		0
Accounts payable — trade		0		3,000,000
Accounts payable — affiliate		22,000,000		18,000,000
Derivative instruments		0		0
Accrued expenses and other current liabilities		11,000,000		24,000,000
Current Liabilities		33,000,000		45,000,000
Other Liabilities
Long-term debt — external		839,000,000		839,000,000
Long-term debt — affiliate		618,000,000		618,000,000
Due to Related Parties, Noncurrent		0
Derivative instruments		0		0
Other non-current liabilities		0		0
Total non-current liabilities		1,457,000,000		1,457,000,000
Total Liabilities		1,490,000,000		1,502,000,000
Contributed capital		1,957,000,000		1,971,000,000
Retained earnings		(182,000,000)		(108,000,000)
Accumulated other comprehensive loss		(76,000,000)		(83,000,000)
Stockholders' Equity Attributable to Noncontrolling Interest		313,000,000		313,000,000
Total Members' Equity		2,012,000,000		2,093,000,000
Total Liabilities and Members’ Equity		3,502,000,000		3,595,000,000
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0	[3]	0	[4]
Restricted cash		0	[3]	0	[5]
Accounts receivable — trade		0	[3]	0	[5]
Accounts receivable — affiliate		0	[3]	0	[5]
Inventory		0	[3]	0	[5]
Derivative Asset	[3]	0
Notes receivable	[3]	0		0
Prepayments and other current assets	[3]	0		0
Total current assets	[3]	0		0
Net property, plant and equipment		0	[3]	0	[5]
Investment in consolidated subsidiaries		(5,316,000,000)	[3]	(5,519,000,000)	[4]
Equity investments in affiliates		0	[3]	0	[4]
Notes receivable		0	[3]	0	[4]
Intangible assets, net		0	[3]	0	[4]
Derivative Asset, Noncurrent	[6]	0
Other non-current assets		0	[3]	0	[5]
Total other assets		(5,316,000,000)	[3]	(5,519,000,000)	[5]
Total Assets		(5,316,000,000)	[3]	(5,519,000,000)	[5]
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	[5]
Long-term debt — affiliate		0	[3]	0	[5]
Due to Related Parties, Noncurrent	[3]	0
Derivative instruments		0	[3]	0	[5]
Other non-current liabilities		0	[3]	0	[5]
Total non-current liabilities		0	[3]	0	[5]
Total Liabilities		0	[3]	0	[5]
Contributed capital		(5,658,000,000)	[3]	(5,765,000,000)	[5]
Retained earnings		245,000,000	[3]	138,000,000	[5]
Accumulated other comprehensive loss		159,000,000	[3]	172,000,000	[5]
Stockholders' Equity Attributable to Noncontrolling Interest		(62,000,000)	[3]	(64,000,000)	[5]
Total Members' Equity		(5,316,000,000)	[3]	(5,519,000,000)	[5]
Total Liabilities and Members’ Equity		$ (5,316,000,000)	[3]	$ (5,519,000,000)	[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]	All significant intercompany transactions have been eliminated in consolidation.
[4]	All significant intercompany transactions have been eliminated in consolidation.
[5]	All significant intercompany transactions have been eliminated in consolidation.
[6]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan46

Condensed Consolidating Financial Information CP Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2016		Dec. 31, 2015		Sep. 30, 2015	[1]	Jun. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	$ 61		$ 89	[1]
Intercompany transactions between Yield LLC and subsidiaries	0		0
Payment to Acquire Business under Common Control	131		0	[1]
Capital expenditures	(4)		(7)	[1]
Increase (Decrease) in Restricted Cash	59		23	[1]
Cash receipts from notes receivable	4		4	[1]
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	16		8	[1]
Investments in unconsolidated affiliates	(7)		(51)	[1]
Net Cash Provided by (Used in) Investing Activities	(63)		(21)	[1]
Transfer of funds under intercompany cash management arrangement	0		0
Net contributions from noncontrolling interests	14		10
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(38)		(11)	[1]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	5		0
Payment of distributions	53		45	[1]
Proceeds from the issuance of long-term debt — external	41		0	[1]
Net Cash (Used in) Provided by Financing Activities	(109)		(103)	[1]
Cash and Cash Equivalents, Period Increase (Decrease)	(111)		(35)	[1]
Cash and cash equivalents	210				$ 321	[2]	$ 110	[1]	$ 75		$ 75
Payments of (Proceeds from) distributions	53		45
NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	0		0
Intercompany transactions between Yield LLC and subsidiaries	(65)		12
Payment to Acquire Business under Common Control	0
Capital expenditures	0		0
Increase (Decrease) in Restricted Cash	0		0
Cash receipts from notes receivable	0		0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	0		0
Investments in unconsolidated affiliates	0		0
Net Cash Provided by (Used in) Investing Activities	(65)		12
Transfer of funds under intercompany cash management arrangement	(5)		24
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
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	5
Proceeds from the issuance of long-term debt — external	0
Net Cash (Used in) Provided by Financing Activities	(53)		(17)
Cash and Cash Equivalents, Period Increase (Decrease)	(118)		(5)
Cash and cash equivalents	93				211		15				10
Payments of (Proceeds from) distributions	53		41
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	1		1
Intercompany transactions between Yield LLC and subsidiaries	0		40
Payment to Acquire Business under Common Control	0
Capital expenditures	0		0
Increase (Decrease) in Restricted Cash	0		0
Cash receipts from notes receivable	0		0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	3		0
Investments in unconsolidated affiliates	(3)		(40)
Net Cash Provided by (Used in) Investing Activities	0		0
Transfer of funds under intercompany cash management arrangement	(1)		(1)
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
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	0
Proceeds from the issuance of long-term debt — external	0
Net Cash (Used in) Provided by Financing Activities	(1)		(1)
Cash and Cash Equivalents, Period Increase (Decrease)	0		0
Cash and cash equivalents	0				0		0				0
Payments of (Proceeds from) distributions	0		0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	109		99
Intercompany transactions between Yield LLC and subsidiaries	0		0
Payment to Acquire Business under Common Control	0
Capital expenditures	(4)		(7)
Increase (Decrease) in Restricted Cash	59		23
Cash receipts from notes receivable	4		4
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	0		0
Investments in unconsolidated affiliates	(4)		0
Net Cash Provided by (Used in) Investing Activities	55		20
Transfer of funds under intercompany cash management arrangement	0		0
Net contributions from noncontrolling interests	0		0
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(38)		(11)
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	0
Proceeds from the issuance of long-term debt — external	41
Net Cash (Used in) Provided by Financing Activities	(157)		(149)
Cash and Cash Equivalents, Period Increase (Decrease)	7		(30)
Cash and cash equivalents	117				110		95				65
Payments of (Proceeds from) distributions	82		71
NRG Yield Operating LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net Cash Provided by (Used in) Operating Activities	(49)		(11)
Intercompany transactions between Yield LLC and subsidiaries	65		(52)
Payment to Acquire Business under Common Control	131
Capital expenditures	0		0
Increase (Decrease) in Restricted Cash	0		0
Cash receipts from notes receivable	0		0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	13		8
Investments in unconsolidated affiliates	0		(11)
Net Cash Provided by (Used in) Investing Activities	(53)		(53)
Transfer of funds under intercompany cash management arrangement	6		(23)
Net contributions from noncontrolling interests	14		10
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	0		0
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	0
Proceeds from the issuance of long-term debt — external	0
Net Cash (Used in) Provided by Financing Activities	102		64
Cash and Cash Equivalents, Period Increase (Decrease)	0		0
Cash and cash equivalents	0				0		$ 0				$ 0
Payments of (Proceeds from) distributions	(82)		$ (67)
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 0	[3]			$ 0	[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]	All significant intercompany transactions have been eliminated in consolidation.
[4]	All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan47

Condensed Consolidating Financial Information PP Income Statement (Details) - USD ($) $ in Millions		3 Months Ended
		Mar. 31, 2017		Mar. 31, 2016
Condensed Income Statements, Captions [Line Items]
Total operating revenues		$ 218		$ 234	[1],[2]
Operating Costs and Expenses [Abstract]
Cost of operations		84		85	[1]
Depreciation and amortization		75		74	[1],[2]
General and administrative		4		2	[1],[2]
Business Combination, Acquisition Related Costs		1		0	[1]
Total operating costs and expenses		164		161	[1]
Operating income (loss)		54		73	[2]
Equity in earnings of consolidated affiliates		0		0
Equity in earnings of unconsolidated affiliates		19		4	[1],[2],[3]
Other income, net		1		0	[1]
Interest expense		73		71	[1],[2]
Total other income (expense), net		(53)		(67)	[1]
Net Income (Loss)		1		6	[1],[2],[3]
Less: Net loss attributable to noncontrolling interests		(9)		(11)	[1]
Net Income Attributable to NRG Yield LLC		10		17	[1]
NRG Yield LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0
Operating Costs and Expenses [Abstract]
Cost of operations		0		0
Depreciation and amortization		0		0
General and administrative		0		0
Business Combination, Acquisition Related Costs		0
Total operating costs and expenses		0		0
Operating income (loss)		0		0
Equity in earnings of consolidated affiliates		10		17
Equity in earnings of unconsolidated affiliates		0		0
Other income, net		0
Interest expense		0		0
Total other income (expense), net		10		17
Net Income (Loss)		10		17
Less: Net loss attributable to noncontrolling interests		0		0
Net Income Attributable to NRG Yield LLC		10		17
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		5		5
Operating Costs and Expenses [Abstract]
Cost of operations		4		3
Depreciation and amortization		1		1
General and administrative		0		0
Business Combination, Acquisition Related Costs		0
Total operating costs and expenses		5		4
Operating income (loss)		0		1
Equity in earnings of consolidated affiliates		(11)		(7)
Equity in earnings of unconsolidated affiliates		2		2
Other income, net		0
Interest expense		0		0
Total other income (expense), net		(9)		(5)
Net Income (Loss)		(9)		(4)
Less: Net loss attributable to noncontrolling interests		0		0
Net Income Attributable to NRG Yield LLC		(9)		(4)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		213		229
Operating Costs and Expenses [Abstract]
Cost of operations		80		82
Depreciation and amortization		74		73
General and administrative		0		0
Business Combination, Acquisition Related Costs		0
Total operating costs and expenses		154		155
Operating income (loss)		59		74
Equity in earnings of consolidated affiliates		0		0
Equity in earnings of unconsolidated affiliates		16		(1)
Other income, net		1
Interest expense		55		55
Total other income (expense), net		(38)		(56)
Net Income (Loss)		21		18
Less: Net loss attributable to noncontrolling interests		(1)		0
Net Income Attributable to NRG Yield LLC		22		18
NRG Yield Operating LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0
Operating Costs and Expenses [Abstract]
Cost of operations		0		0
Depreciation and amortization		0		0
General and administrative		4		2
Business Combination, Acquisition Related Costs		1
Total operating costs and expenses		5		2
Operating income (loss)		(5)		(2)
Equity in earnings of consolidated affiliates		23		21
Equity in earnings of unconsolidated affiliates		1		3
Other income, net		0
Interest expense		18		16
Total other income (expense), net		6		8
Net Income (Loss)		1		6
Less: Net loss attributable to noncontrolling interests		(9)		(11)
Net Income Attributable to NRG Yield LLC		10		17
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0	[4]	0	[5]
Operating Costs and Expenses [Abstract]
Cost of operations		0	[4]	0	[5]
Depreciation and amortization		0	[4]	0	[5]
General and administrative		0	[4]	0	[5]
Business Combination, Acquisition Related Costs	[4]	0
Total operating costs and expenses		0	[4]	0	[5]
Operating income (loss)		0	[4]	0	[5]
Equity in earnings of consolidated affiliates		(22)	[4]	(31)	[5]
Equity in earnings of unconsolidated affiliates		0	[4]	0	[5]
Other income, net	[4]	0
Interest expense		0	[4]	0	[5]
Total other income (expense), net		(22)	[4]	(31)	[5]
Net Income (Loss)		(22)		(31)	[5]
Less: Net loss attributable to noncontrolling interests		1	[4]	0	[5]
Net Income Attributable to NRG Yield LLC		$ (23)	[4]	$ (31)	[5]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	All significant intercompany transactions have been eliminated in consolidation.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan48

Condensed Consolidating Financial Information PP Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	$ 1		$ 6	[1],[2],[3]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		(50)	[4]
Other Comprehensive Income (Loss), Net of Tax	7		(50)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	8		(44)	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(9)		(12)	[4]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	17		(32)	[4]
NRG Yield LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	10		17
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		(49)
Other Comprehensive Income (Loss), Net of Tax	7		(49)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	17		(32)
Less: Comprehensive loss attributable to noncontrolling interests	0		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	17		(32)
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(9)		(4)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0		(1)
Other Comprehensive Income (Loss), Net of Tax	0		(1)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(9)		(5)
Less: Comprehensive loss attributable to noncontrolling interests	0		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	(9)		(5)
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	21		18
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	6		(46)
Other Comprehensive Income (Loss), Net of Tax	6		(46)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	27		(28)
Less: Comprehensive loss attributable to noncontrolling interests	(1)		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	28		(28)
NRG Yield Operating LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	1		6
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	7		(50)
Other Comprehensive Income (Loss), Net of Tax	7		(50)
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	8		(44)
Less: Comprehensive loss attributable to noncontrolling interests	(9)		(12)
Comprehensive Income (Loss) Attributable to NRG Yield LLC	17		(32)
Consolidation, Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(22)		(31)	[5]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(13)	[6]	96
Other Comprehensive Income (Loss), Net of Tax	(13)	[6]	96
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(35)	[6]	65
Less: Comprehensive loss attributable to noncontrolling interests	1		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	$ (36)		$ 65
[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]	Three months ended March 31, 2016(In millions)Conventional Generation Renewables Thermal Corporate TotalOperating revenues$79 $111 $44 $— $234Cost of operations23 33 29 — 85Depreciation and amortization20 49 5 — 74General and administrative— — — 2 2Operating income (loss)36 29 10 (2) 73Equity in earnings of unconsolidated affiliates3 1 — — 4Interest expense(11) (42) (2) (16) (71)Net Income (Loss)$28 $(12) $8 $(18) $6
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) All significant intercompany transactions have been eliminated in consolidation.
[6]	All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan49

Condensed Consolidating Financial Information PP Balance Sheet (Details) - USD ($)		Mar. 31, 2017		Dec. 31, 2016		Dec. 31, 2015		Sep. 30, 2015	[2]	Jun. 30, 2015
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		$ 210,000,000		$ 321,000,000	[1]	$ 110,000,000	[2]	$ 75,000,000		$ 75,000,000
Restricted cash		106,000,000		165,000,000	[1]
Accounts receivable — trade		82,000,000		92,000,000	[1]
Accounts receivable — affiliate		3,000,000		1,000,000	[1]
Inventory		40,000,000		39,000,000	[1]
Notes receivable		15,000,000		16,000,000	[1]
Prepayments and other current assets		19,000,000		20,000,000	[1]
Total current assets		476,000,000		656,000,000	[1]
Net property, plant and equipment		5,390,000,000		5,460,000,000	[1]
Investment in consolidated subsidiaries		0		0
Equity investments in affiliates		1,154,000,000		1,152,000,000	[1]
Notes receivable		10,000,000		14,000,000	[1]
Intangible assets, net		1,268,000,000		1,286,000,000	[1]
Derivative Instruments and Hedges, Noncurrent				1,000,000
Other non-current assets		66,000,000		51,000,000	[1]
Total other assets		2,500,000,000		2,504,000,000	[1]
Total Assets		8,366,000,000		8,620,000,000	[1]
Current portion of long-term debt — external		296,000,000		291,000,000	[1]
Accounts payable — trade		26,000,000		23,000,000	[1]
Accounts payable — affiliate		50,000,000		40,000,000	[1]
Derivative instruments		28,000,000		32,000,000	[1]
Accrued expenses and other current liabilities		54,000,000		85,000,000	[1]
Current Liabilities		454,000,000		471,000,000	[1]
Other Liabilities
Long-term debt — external		5,061,000,000		5,098,000,000	[1]
Long-term debt — affiliate		618,000,000		618,000,000	[1]
Derivative instruments		40,000,000		44,000,000	[1]
Other non-current liabilities		79,000,000		76,000,000	[1]
Total non-current liabilities		5,804,000,000		5,845,000,000	[1]
Total Liabilities		6,258,000,000		6,316,000,000	[1]
Commitments and Contingencies		0		0
Contributed capital		1,865,000,000		1,995,000,000	[1]
Retained earnings		6,000,000		79,000,000	[1]
Accumulated other comprehensive loss		(76,000,000)		(83,000,000)	[1]
Noncontrolling interest		313,000,000		313,000,000
Total Members' Equity		2,108,000,000		2,304,000,000	[1]
Total Liabilities and Members’ Equity		8,366,000,000		8,620,000,000	[1]
Derivative Instruments and Hedges, Assets				2,000,000
Derivative Asset		1,000,000
NRG Yield LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		93,000,000		211,000,000		15,000,000				10,000,000
Restricted cash		0		0
Accounts receivable — trade		0		0
Accounts receivable — affiliate		3,000,000		0
Inventory		0		0
Notes receivable		0		0
Prepayments and other current assets		0		0
Total current assets		96,000,000		211,000,000
Net property, plant and equipment		0		0
Investment in consolidated subsidiaries		1,699,000,000		1,780,000,000
Equity investments in affiliates		0		0
Notes receivable		0		0
Intangible assets, net		0		0
Derivative Instruments and Hedges, Noncurrent				0
Other non-current assets		0		0
Total other assets		1,699,000,000		1,780,000,000
Total Assets		1,795,000,000		1,991,000,000
Current portion of long-term debt — external		0		0
Accounts payable — trade		0		0
Accounts payable — affiliate		0		0
Derivative instruments		0		0
Accrued expenses and other current liabilities		0		0
Current Liabilities		0		0
Other Liabilities
Long-term debt — external		0		0
Long-term debt — affiliate		0		0
Derivative instruments		0		0
Other non-current liabilities		0		0
Total non-current liabilities		0		0
Total Liabilities		0		0
Contributed capital		1,865,000,000		1,995,000,000
Retained earnings		6,000,000		79,000,000
Accumulated other comprehensive loss		(76,000,000)		(83,000,000)
Noncontrolling interest		0		0
Total Members' Equity		1,795,000,000		1,991,000,000
Total Liabilities and Members’ Equity		1,795,000,000		1,991,000,000
Derivative Instruments and Hedges, Assets				0
Derivative Asset		0
Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0		0		0				0
Restricted cash		0		0
Accounts receivable — trade		2,000,000		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		3,000,000		4,000,000
Net property, plant and equipment		58,000,000		59,000,000
Investment in consolidated subsidiaries		483,000,000		527,000,000
Equity investments in affiliates		177,000,000		171,000,000
Notes receivable		0		0
Intangible assets, net		55,000,000		56,000,000
Derivative Instruments and Hedges, Noncurrent				0
Other non-current assets		0		0
Total other assets		715,000,000		754,000,000
Total Assets		776,000,000		817,000,000
Current portion of long-term debt — external		0		0
Accounts payable — trade		1,000,000		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		7,000,000		10,000,000
Other Liabilities
Long-term debt — external		0		0
Long-term debt — affiliate		0		0
Derivative instruments		0		0
Other non-current liabilities		0		0
Total non-current liabilities		0		0
Total Liabilities		7,000,000		10,000,000
Contributed capital		845,000,000		874,000,000
Retained earnings		(74,000,000)		(65,000,000)
Accumulated other comprehensive loss		(2,000,000)		(2,000,000)
Noncontrolling interest		0		0
Total Members' Equity		769,000,000		807,000,000
Total Liabilities and Members’ Equity		776,000,000		817,000,000
Derivative Instruments and Hedges, Assets				0
Derivative Asset		0
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		117,000,000		110,000,000		95,000,000				65,000,000
Restricted cash		106,000,000		165,000,000
Accounts receivable — trade		80,000,000		90,000,000
Accounts receivable — affiliate		0		1,000,000
Inventory		39,000,000		37,000,000
Notes receivable		15,000,000		16,000,000
Prepayments and other current assets		19,000,000		19,000,000
Total current assets		377,000,000		440,000,000
Net property, plant and equipment		5,332,000,000		5,401,000,000
Investment in consolidated subsidiaries		0		0
Equity investments in affiliates		610,000,000		600,000,000
Notes receivable		10,000,000		14,000,000
Intangible assets, net		1,213,000,000		1,230,000,000
Derivative Instruments and Hedges, Noncurrent				1,000,000
Other non-current assets		65,000,000		50,000,000
Total other assets		1,900,000,000		1,895,000,000
Total Assets		7,609,000,000		7,736,000,000
Current portion of long-term debt — external		296,000,000		291,000,000
Accounts payable — trade		25,000,000		18,000,000
Accounts payable — affiliate		23,000,000		15,000,000
Derivative instruments		28,000,000		32,000,000
Accrued expenses and other current liabilities		42,000,000		60,000,000
Current Liabilities		414,000,000		416,000,000
Other Liabilities
Long-term debt — external		4,222,000,000		4,259,000,000
Long-term debt — affiliate		0		0
Derivative instruments		40,000,000		44,000,000
Other non-current liabilities		79,000,000		76,000,000
Total non-current liabilities		4,347,000,000		4,388,000,000
Total Liabilities		4,761,000,000		4,804,000,000
Contributed capital		2,856,000,000		2,920,000,000
Retained earnings		11,000,000		35,000,000
Accumulated other comprehensive loss		(81,000,000)		(87,000,000)
Noncontrolling interest		62,000,000		64,000,000
Total Members' Equity		2,848,000,000		2,932,000,000
Total Liabilities and Members’ Equity		7,609,000,000		7,736,000,000
Derivative Instruments and Hedges, Assets				2,000,000
Derivative Asset		1,000,000
NRG Yield Operating LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0		0		$ 0				$ 0
Restricted cash		0		0
Accounts receivable — trade		0		0
Accounts receivable — affiliate		0		0
Inventory		0		0
Notes receivable		0		0
Prepayments and other current assets		0		1,000,000
Total current assets		0		1,000,000
Net property, plant and equipment		0		0
Investment in consolidated subsidiaries		3,134,000,000		3,212,000,000
Equity investments in affiliates		367,000,000		381,000,000
Notes receivable		0		0
Intangible assets, net		0		0
Derivative Instruments and Hedges, Noncurrent				0
Other non-current assets		1,000,000		1,000,000
Total other assets		3,502,000,000		3,594,000,000
Total Assets		3,502,000,000		3,595,000,000
Current portion of long-term debt — external		0		0
Accounts payable — trade		0		3,000,000
Accounts payable — affiliate		22,000,000		18,000,000
Derivative instruments		0		0
Accrued expenses and other current liabilities		11,000,000		24,000,000
Current Liabilities		33,000,000		45,000,000
Other Liabilities
Long-term debt — external		839,000,000		839,000,000
Long-term debt — affiliate		618,000,000		618,000,000
Derivative instruments		0		0
Other non-current liabilities		0		0
Total non-current liabilities		1,457,000,000		1,457,000,000
Total Liabilities		1,490,000,000		1,502,000,000
Contributed capital		1,957,000,000		1,971,000,000
Retained earnings		(182,000,000)		(108,000,000)
Accumulated other comprehensive loss		(76,000,000)		(83,000,000)
Noncontrolling interest		313,000,000		313,000,000
Total Members' Equity		2,012,000,000		2,093,000,000
Total Liabilities and Members’ Equity		3,502,000,000		3,595,000,000
Derivative Instruments and Hedges, Assets				0
Derivative Asset		0
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0	[3]	0	[4]
Restricted cash		0	[3]	0	[5]
Accounts receivable — trade		0	[3]	0	[5]
Accounts receivable — affiliate		0	[3]	0	[5]
Inventory		0	[3]	0	[5]
Notes receivable	[3]	0		0
Prepayments and other current assets	[3]	0		0
Total current assets	[3]	0		0
Net property, plant and equipment		0	[3]	0	[5]
Investment in consolidated subsidiaries		(5,316,000,000)	[3]	(5,519,000,000)	[4]
Equity investments in affiliates		0	[3]	0	[4]
Notes receivable		0	[3]	0	[4]
Intangible assets, net		0	[3]	0	[4]
Derivative Instruments and Hedges, Noncurrent	[5]			0
Other non-current assets		0	[3]	0	[5]
Total other assets		(5,316,000,000)	[3]	(5,519,000,000)	[5]
Total Assets		(5,316,000,000)	[3]	(5,519,000,000)	[5]
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	[5]
Long-term debt — affiliate		0	[3]	0	[5]
Derivative instruments		0	[3]	0	[5]
Other non-current liabilities		0	[3]	0	[5]
Total non-current liabilities		0	[3]	0	[5]
Total Liabilities		0	[3]	0	[5]
Contributed capital		(5,658,000,000)	[3]	(5,765,000,000)	[5]
Retained earnings		245,000,000	[3]	138,000,000	[5]
Accumulated other comprehensive loss		159,000,000	[3]	172,000,000	[5]
Noncontrolling interest		(62,000,000)	[3]	(64,000,000)	[5]
Total Members' Equity		(5,316,000,000)	[3]	(5,519,000,000)	[5]
Total Liabilities and Members’ Equity		(5,316,000,000)	[3]	(5,519,000,000)	[5]
Derivative Instruments and Hedges, Assets				$ 0
Derivative Asset	[3]	$ 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]	All significant intercompany transactions have been eliminated in consolidation.
[4]	All significant intercompany transactions have been eliminated in consolidation.
[5]	All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan50

Condensed Consolidating Financial Information PP Cash Flows (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017		Mar. 31, 2016		Dec. 31, 2016		Dec. 31, 2015		Sep. 30, 2015	[1]	Jun. 30, 2015
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the revolving credit facility	$ 0		$ 40
Net contributions from noncontrolling interests	14		10
Net Cash Provided by (Used in) Operating Activities	61		89	[1]
Intercompany transactions between Yield LLC and subsidiaries	0		0
Capital expenditures	(4)		(7)	[1]
Increase (Decrease) in Restricted Cash	59		23	[1]
Cash receipts from notes receivable	4		4	[1]
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	16		8	[1]
Investments in unconsolidated affiliates	(7)		(51)	[1]
Other	0		(2)	[1]
Net Cash Provided by (Used in) Investing Activities	(63)		(21)	[1]
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(38)		(11)	[1]
Proceeds from the issuance of Class C units	5		0
Transfer of funds under intercompany cash management arrangement	0		0
Payments of distributions	(53)		(45)	[1]
Proceeds from the issuance of long-term debt — external	41		0	[1]
Payments of Debt Issuance Costs	(3)		0	[1]
Proceeds from Lines of Credit	0		50	[1]
Repayments of Long-term Debt	(75)		(67)
Net Cash (Used in) Provided by Financing Activities	(109)		(103)	[1]
Cash and Cash Equivalents, Period Increase (Decrease)	(111)		(35)	[1]
Cash and cash equivalents	210				$ 321	[2]	$ 110	[1]	$ 75		$ 75
NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the revolving credit facility			0
Net contributions from noncontrolling interests	0		0
Net Cash Provided by (Used in) Operating Activities	0		0
Intercompany transactions between Yield LLC and subsidiaries	(65)		12
Capital expenditures	0		0
Increase (Decrease) in Restricted Cash	0		0
Cash receipts from notes receivable	0		0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	0		0
Investments in unconsolidated affiliates	0		0
Other			0
Net Cash Provided by (Used in) Investing Activities	(65)		12
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	5
Transfer of funds under intercompany cash management arrangement	(5)		24
Proceeds from the issuance of long-term debt — external	0
Payments of Debt Issuance Costs	0
Proceeds from Lines of Credit			0
Repayments of Long-term Debt	0		0
Net Cash (Used in) Provided by Financing Activities	(53)		(17)
Cash and Cash Equivalents, Period Increase (Decrease)	(118)		(5)
Cash and cash equivalents	93				211		15				10
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the revolving credit facility			0
Net contributions from noncontrolling interests	0		0
Net Cash Provided by (Used in) Operating Activities	1		1
Intercompany transactions between Yield LLC and subsidiaries	0		40
Capital expenditures	0		0
Increase (Decrease) in Restricted Cash	0		0
Cash receipts from notes receivable	0		0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	3		0
Investments in unconsolidated affiliates	(3)		(40)
Other			0
Net Cash Provided by (Used in) Investing Activities	0		0
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)		(1)
Proceeds from the issuance of long-term debt — external	0
Payments of Debt Issuance Costs	0
Proceeds from Lines of Credit			0
Repayments of Long-term Debt	0		0
Net Cash (Used in) Provided by Financing Activities	(1)		(1)
Cash and Cash Equivalents, Period Increase (Decrease)	0		0
Cash and cash equivalents	0				0		0				0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the revolving credit facility			0
Net contributions from noncontrolling interests	0		0
Net Cash Provided by (Used in) Operating Activities	109		99
Intercompany transactions between Yield LLC and subsidiaries	0		0
Capital expenditures	(4)		(7)
Increase (Decrease) in Restricted Cash	59		23
Cash receipts from notes receivable	4		4
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	0		0
Investments in unconsolidated affiliates	(4)		0
Other			0
Net Cash Provided by (Used in) Investing Activities	55		20
Net distributions and return of capital to NRG prior to the acquisition of Drop Down Assets	(38)		(11)
Proceeds from the issuance of Class C units	0
Transfer of funds under intercompany cash management arrangement	0		0
Proceeds from the issuance of long-term debt — external	41
Payments of Debt Issuance Costs	(3)
Proceeds from Lines of Credit			0
Repayments of Long-term Debt	(75)		(67)
Net Cash (Used in) Provided by Financing Activities	(157)		(149)
Cash and Cash Equivalents, Period Increase (Decrease)	7		(30)
Cash and cash equivalents	117				110		95				65
NRG Yield Operating LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Payments for the revolving credit facility			40
Net contributions from noncontrolling interests	14		10
Net Cash Provided by (Used in) Operating Activities	(49)		(11)
Intercompany transactions between Yield LLC and subsidiaries	65		(52)
Capital expenditures	0		0
Increase (Decrease) in Restricted Cash	0		0
Cash receipts from notes receivable	0		0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	13		8
Investments in unconsolidated affiliates	0		(11)
Other			(2)
Net Cash Provided by (Used in) Investing Activities	(53)		(53)
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	6		(23)
Proceeds from the issuance of long-term debt — external	0
Payments of Debt Issuance Costs	0
Proceeds from Lines of Credit			50
Repayments of Long-term Debt	0		0
Net Cash (Used in) Provided by Financing Activities	102		64
Cash and Cash Equivalents, Period Increase (Decrease)	0		$ 0
Cash and cash equivalents	0				0		$ 0				$ 0
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Cash and cash equivalents	$ 0	[3]			$ 0	[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]	All significant intercompany transactions have been eliminated in consolidation.
[4]	All significant intercompany transactions have been eliminated in consolidation.