Clearway Energy (CWEN.A) 10-Q 4 Nov 16 2016 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2016	Oct. 31, 2016
Class of Stock [Line Items]
Entity Registrant Name	NRG Yield LLC
Entity Central Index Key	1,637,757
Document Type	10-Q
Document Period End Date	Sep. 30, 2016
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	Q3
Common Class A [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		34,586,250
Common Class B [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		42,738,750
Common Class C [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		62,784,250
Common Class D [Member]
Class of Stock [Line Items]
Entity Common Stock, Shares Outstanding		42,738,750

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Operating Revenues
Total operating revenues		$ 272		$ 256	[1],[2]	$ 789		$ 729	[1],[2]
Operating Costs and Expenses [Abstract]
Cost of operations		76		82	[1]	238		246	[1]
Depreciation and amortization		75		69	[1],[2]	224		222	[1],[2]
General and administrative		3		2	[2]	8		8	[1],[2]
Acquisition-related transaction and integration costs		0		1	[1],[2]	0		2	[1],[2]
Total operating costs and expenses		154		154	[1]	470		478	[1]
Operating Income		118		102	[1],[2]	319		251	[1],[2]
Costs and Expenses [Abstract]
Equity in earnings of unconsolidated affiliates		13		12	[1],[2]	29		19	[1],[2],[3]
Other income, net		1		0	[1]	3		2	[1],[2]
Gains (Losses) on Extinguishment of Debt		0		(2)	[1],[2]	0		(9)	[1],[2],[3]
Interest expense		(68)		(68)	[1],[2]	(204)		(195)	[1],[2]
Total other expense, net		(54)		(58)	[1]	(172)		(183)	[1]
Net Income		64		44	[1],[2]	147		68	[1],[2],[3]
Less: Net loss attributable to noncontrolling interests		(36)		(18)	[1]	(62)		(34)	[1]
Net Income Attributable to NRG Yield LLC		100		62	[1]	209		102	[1]
Consolidation, Eliminations [Member]
Operating Revenues
Total operating revenues		0	[4]	0	[5],[6]	0	[4]	0	[5],[6]
Operating Costs and Expenses [Abstract]
Cost of operations		0	[4]	0	[5],[6]	0	[4]	0	[5],[6]
Depreciation and amortization		0	[4]	0	[5],[6]	0	[4]	0	[5],[6]
General and administrative		0	[4]	0	[5],[6]	0	[4]	0	[5],[6]
Acquisition-related transaction and integration costs	[5],[6]			0				0
Total operating costs and expenses		0	[4]	0	[5],[6]	0	[4]	0	[5],[6]
Operating Income		0	[4]	0	[5],[6]	0	[4]	0	[5],[6]
Costs and Expenses [Abstract]
Equity in earnings of unconsolidated affiliates		0	[4]	0	[5],[6]	0	[4]	0	[5],[6]
Other income, net						0	[4]	0	[5],[6]
Gains (Losses) on Extinguishment of Debt	[5],[6]			0				0
Interest expense		0	[4]	0	[5],[6]	0	[4]	0	[5],[6]
Total other expense, net		(174)	[4]	(101)	[5],[6]	(408)	[4]	(162)	[5],[6]
Net Income		(174)	[4]	(101)	[5],[6]	(408)	[4]	(162)	[5],[6]
Less: Net loss attributable to noncontrolling interests		1	[4]	(2)	[5],[6]	1	[4]	2	[5],[6]
Net Income Attributable to NRG Yield LLC		$ (175)	[4]	$ (99)	[5],[6]	$ (409)	[4]	$ (164)	[5],[6]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	All significant intercompany transactions have been eliminated in consolidation.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidated Stateme3

Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015		Sep. 30, 2016	Sep. 30, 2015
Net Income	$ 64	$ 44	[1],[2]	$ 147	$ 68	[1],[2],[3]
Other Comprehensive Loss, net of tax
Unrealized (loss) gain on derivatives	20	(40)	[4]	(49)	(41)	[4]
Other comprehensive (loss) income	20	(40)	[4]	(49)	(41)	[4]
Comprehensive Income	84	4	[4]	98	27	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(27)	(19)	[4]	(62)	(35)	[4]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	$ 111	$ 23	[4]	$ 160	$ 62	[4]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Current Assets
Cash and cash equivalents	$ 200	$ 110	[1]
Restricted cash	138	131	[1]
Accounts receivable — trade	115	101	[1]
Accounts receivable — affiliate	3	4	[1]
Inventory	37	36	[1]
Notes receivable	17	17	[1]
Derivative instruments — affiliate	1	0	[1]
Prepayments and other current assets	21	20	[1]
Total current assets	532	419	[1]
Property, plant and equipment
Less accumulated depreciation	(1,002)	(782)
Property, plant and equipment, net of accumulated depreciation of $1,002 and $782	5,711	5,878	[1]
Other Assets
Equity investments in affiliates	690	697	[1]
Notes receivable	18	30	[1]
Intangible assets, net of accumulated amortization of $151 and $93	1,303	1,362	[1]
Other non-current assets	47	136	[1]
Total other assets	2,058	2,225	[1]
Total Assets	8,301	8,522	[1]
Current Liabilities
Current portion of long-term debt — external	281	264	[1],[2]
Accounts payable — trade	23	23	[1]
Accounts payable — affiliate	29	86	[1]
Derivative instruments	32	39	[1]
Accrued expenses and other current liabilities	94	76	[1]
Total current liabilities	459	488	[1]
Other Liabilities
Long-term debt — external	4,764	4,743	[1]
Long-term debt — affiliate	618	618	[1]
Due to Related Parties, Noncurrent	11	0	[1]
Derivative instruments	107	61	[1]
Other non-current liabilities	78	72	[1]
Total non-current liabilities	5,578	5,494	[1]
Total Liabilities	6,037	5,982	[1]
Members' Equity
Contributed capital	1,848	2,082	[1]
Retained earnings	164	93	[1]
Accumulated other comprehensive loss	(144)	(95)	[1]
Noncontrolling interest	396	460	[1]
Total Members' Equity	2,264	2,540	[1]
Total Liabilities and Members’ Equity	$ 8,301	$ 8,522	[1]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(c) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidated Stateme

Condensed Consolidated Statements Of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015
Cash Flows from Operating Activities
Net income	$ 147		$ 68	[1],[2],[3]
Adjustments to reconcile net (loss) income to net cash provided by operating activities:
Income (Loss) from Equity Method Investments	29		19	[1],[2],[3]
Distributions from unconsolidated affiliates	39		40	[2]
Depreciation, Amortization and Accretion, Net	226		224	[2]
Amortization of financing costs and debt discounts	6		7	[2]
Amortization of Intangibles and Out of Market Contracts	57		41	[2]
Gains (Losses) on Extinguishment of Debt	0		(9)	[1],[2],[3]
Changes in derivative instruments	(5)		(38)	[2]
Disposal of asset components and ARO accretion	(5)		(2)	[2]
Changes in prepaid and accrued capacity payments	(2)		1	[2]
Changes in other working capital	(8)		(23)	[2]
Net Cash Provided by Operating Activities	440		310	[2]
Cash Flows from Investing Activities
Payments to Acquire Businesses, Net of Cash Acquired	0		37	[2]
Payment to Acquire Business under Common Control	77		489	[2]
Capital expenditures	(16)		(17)	[2]
Increase in restricted cash	(7)		(24)	[2]
Decrease in notes receivable	11		13	[2]
Proceeds from Renewable Energy Grants	0		22
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital	16		16	[2]
Investments in unconsolidated affiliates	(69)		(351)	[2]
Net Cash Used in Investing Activities	(142)		(867)	[2]
Cash Flows from Financing Activities
Net contributions from noncontrolling interests	7		123	[2]
Distributions to NRG for CVSR and NRG Wind TE Holdco	(122)		(52)	[2]
Proceeds from the issuance of Class C and Class A units	0		599	[2]
Payment of distributions	(127)		(99)	[2]
Proceeds from issuance of long-term debt — affiliate	0		281	[2]
Payments of Debt Issuance Costs	(6)		(7)	[2]
Proceeds from (Repayments of) Lines of Credit	(306)		92	[2]
Proceeds from the issuance of long-term debt — external	550		5	[2]
Repayments of Long-term Debt	(204)		(669)
Net Cash (Used in) Provided by Financing Activities	(208)		273	[2]
Net (Increase) Decrease in Cash and Cash Equivalents	90		(284)	[2]
Cash and Cash Equivalents at Beginning of Period	110	[4]	429	[2]
Cash and Cash Equivalents at End of Period	$ 200		$ 145	[2]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Nature of Business

Nature of Business	9 Months Ended
	Sep. 30, 2016
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. NRG Yield LLC, through its wholly owned subsidiary Yield Operating LLC, holds a portfolio of renewable and conventional generation and thermal infrastructure assets, primarily located in the Northeast, Southwest and California regions of the U.S. On June 29, 2015, Yield, Inc. issued 28,198,000 shares of Class C common stock for net proceeds of $599 million . Yield, Inc. utilized the proceeds of the offering to acquire 28,198,000 Class C units of NRG Yield LLC, increasing its voting interest to 44.9% and its economic interest to 53.3% . Yield, Inc. consolidates the results of the Company through its controlling interest as sole managing member of NRG Yield LLC. The following table represents the structure of the Company as of September 30, 2016 : As of September 30, 2016 , 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 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 610 Distributed Solar AZ DG Solar Projects 100 % 5 Various 2025 - 2033 PFMG DG Solar Projects 51 % 4 Various 2032 9 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 74.3 % 16 Corn Belt Power Cooperative 2027 Elbow Creek 75 % 92 NRG Power Marketing LLC 2022 Elkhorn Ridge 50.3 % 41 Nebraska Public Power District 2029 Forward 75 % 22 Constellation NewEnergy, Inc. 2017 Goat Wind 74.9 % 113 Dow Pipeline Company 2025 Hardin 74.3 % 11 Interstate Power and Light Company 2027 Laredo Ridge 100 % 80 Nebraska Public Power District 2031 Lookout 75 % 29 Southern Maryland Electric Cooperative 2030 Odin 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 56.3 % 68 Southwestern Public Service Company 2025 Sleeping Bear 75 % 71 Public Service Company of Oklahoma 2032 South Trent 100 % 101 AEP Energy Partners 2029 Spanish Fork 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 74.9 % 121 Southwestern Public Service Company 2027 1,999 Projects Percentage Ownership Net Capacity (MW) (a) Offtake Counterparty Expiration Thermal Thermal equivalent MWt (c) 100 % 1,315 Various Various NRG Dover Energy Center LLC 100 % 103 NRG Power Marketing LLC 2018 Thermal generation 100 % 20 Various Various 1,438 Total net capacity (excluding equivalent MWt) (d) 4,686 (a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016 . (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) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects, of which the Company's net interests are 41 MW and 49 , respectively, based on cash to be distributed. These projects are part of tax equity arrangements and are consolidated by NRG, as further described in Note 4 , Variable Interest Entities, or VIEs . 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. Three out of the fourteen district energy systems are subject to rate regulation by state public utility commissions while the other district energy systems have rates determined by negotiated bilateral contracts. As described in Note 9 , Related Party Transactions , the Company has a management services agreement with NRG for various services, including human resources, accounting, tax, legal, information systems, treasury, and risk management. As described in Note 3 , Business Acquisitions , on September 1, 2016, the Company acquired the remaining 51.05% of CVSR, or the CVSR Drop Down, from NRG for cash consideration of $78.5 million plus an immaterial working capital adjustment. Prior to the transaction, the Company recorded its 48.95% interest in CVSR as an equity method investment. The acquisition of the CVSR Drop Down 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 removed the equity method investment from all prior periods and adjusted its financial statements to reflect its results of operations, financial position and cash flows as if it had consolidated CVSR from the beginning of the financial statement period. Previously, on November 3, 2015, the Company acquired 75% of the Class B interests of NRG Wind TE Holdco, or the November 2015 Drop Down Assets, from NRG for cash consideration of $209 million . In February 2016, NRG made a final working capital payment of $2 million , reducing total cash consideration to $207 million . On January 2, 2015, the Company acquired the Laredo Ridge, Tapestry, and Walnut Creek projects, or the January 2015 Drop Down Assets, for total cash consideration of $489 million , including $9 million for working capital. The recast for these transactions, referred to as Drop Down Assets, were accounted for as transfers of entities under common control. 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 consolidated financial statements for the year ended December 31, 2015 . Interim results are not necessarily indicative of results for a full year. In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of September 30, 2016 , and the results of operations, comprehensive income (loss) and cash flows for the three and nine months ended September 30, 2016 and 2015 .

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Use of Estimates The preparation of consolidated financial statements in accordance with GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amounts of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could be different from these estimates. Accumulated Depreciation, Accumulated Amortization The following table presents the accumulated depreciation included in the property, plant and equipment, net, and accumulated amortization included in intangible assets, net, respectively, as of September 30, 2016 and December 31, 2015: September 30, 2016 December 31, 2015 (In millions) Property, Plant and Equipment Accumulated Depreciation $ 1,002 $ 782 Intangible Assets Accumulated Amortization 151 93 Noncontrolling Interests The following table reflects the changes in the Company's noncontrolling interest balance: (In millions) Balance as of December 31, 2015 460 Capital contributions from tax equity investors, net of distributions 7 Distributions to NRG for NRG Wind TE Holdco (9 ) Comprehensive loss (62 ) Balance as of September 30, 2016 $ 396 Distributions The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the nine months ended September 30, 2016 : Third Quarter 2016 Second Quarter 2016 First Quarter 2016 Distributions per Class A, B, C and D unit $ 0.24 $ 0.23 $ 0.225 On November 2, 2016 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.25 per unit payable on December 15, 2016 to unit holders of record as of December 1, 2016 . Reclassifications Certain prior-year amounts have been reclassified for comparative purposes. Recent Accounting Developments ASU 2016-16 - In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740) , Intra-Entity Transfers of Assets Other Than Inventory, or ASU No. 2016-16. The amendments of ASU No. 2016-16 were issued to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Current GAAP prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party which has resulted in diversity in practice and increased complexity within financial reporting. The amendments of ASU No. 2016-16 would require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs and do not require new disclosure requirements. The amendments of ASU No. 2016-16 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. 2016-16 should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company is currently evaluating the impact of the standard on the Company’s results of operations, cash flows and financial position. ASU 2016-15 — In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230) , Classification of Certain Cash Receipts and Cash Payments, or ASU No. 2016-15. The amendments of ASU No. 2016-15 were issued to address eight specific cash flow issues for which stakeholders have indicated to the FASB that a diversity in practice existed in how entities were presenting and classifying these items in the statement of cash flows. The issues addressed by ASU No. 2016-15 include but are not limited to the classification of debt prepayment and debt extinguishment costs, payments made for contingent consideration for a business combination, proceeds from the settlement of insurance proceeds, distributions received from equity method investees and separately identifiable cash flows and the application of the predominance principle. The amendments of ASU No. 2016-15 are effective for public entities for fiscal years beginning after December 15, 2017 and interim periods in those fiscal years. Early adoption is permitted, including adoption in an interim fiscal period with all amendments adopted in the same period. The adoption of ASU No. 2016-15 is required to be applied retrospectively. The Company is currently evaluating the impact of the standard on the Company's statement of cash flows. ASU 2016-07 — In March 2016, the FASB issued ASU No. 2016-07, Investments - Equity Method and Joint Ventures (Topic 323), or ASU No. 2016-07. The amendments of ASU No. 2016-07 eliminate the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting with no retroactive adjustment to the investment. In addition, ASU No. 2016-07 requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. The guidance in ASU No. 2016-07 is effective for fiscal years beginning after December 15, 2016, and interim periods within those annual periods. The adoption of ASU No. 2016-07 is required to be applied prospectively and early adoption is permitted. The Company does not expect the standard to have a material impact on its results of operations, cash flows and financial position. ASU 2016-02 — In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), or ASU No. 2016-02. The amendments of ASU No. 2016-02 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common leasing standard for GAAP and International Financial Reporting Standards, or IFRS, 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. The guidance in ASU No. 2016-02 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, ASU No. 2016-02 expands the required quantitative and qualitative disclosures with regards to lease arrangements. The guidance in ASU No. 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those annual periods. The adoption of ASU No. 2016-02 is required to be applied using a modified retrospective approach for the earliest period presented and early adoption is permitted. The Company is currently working through an adoption plan which includes the evaluation of lease contracts compared to the new standard and evaluating the impact of ASU No.2016-02 on the Company's results of operations, cash flows and financial position. ASU 2016-01 — In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , or ASU No. 2016-01. The amendments of ASU No. 2016-01 eliminate available-for-sale classification of equity investments and require that equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be generally measured at fair value with changes in fair value recognized in net income. Further, the amendments require financial assets and financial liabilities to be presented separately in the notes to the financial statements, grouped by measurement category and form of financial asset. The guidance in ASU No. 2016-01 is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those annual periods. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position. ASU 2015-16 — In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments , or ASU No. 2015-16. The amendments of ASU No. 2015-16 require that an acquirer recognize measurement period adjustments to the provisional amounts recognized in a business combination in the reporting period during which the adjustments are determined. Additionally, the amendments of ASU No. 2015-16 require the acquirer to record in the same period's financial statements the effect on earnings of changes in depreciation, amortization or other income effects, if any, as a result of the measurement period adjustment, calculated as if the accounting had been completed at the acquisition date as well as disclosing on either the face of the income statement or in the notes the portion of the amount recorded in current period earnings that would have been recorded in previous reporting periods. The guidance in ASU No. 2015-16 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The amendments should be applied prospectively. The Company adopted this standard on January 1, 2016, and the adoption of this standard did not impact the Company's results of operations, cash flows or financial position. 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. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. In addition to ASU No. 2014-09, the FASB has issued additional guidance which provides further clarification on Topic 606 including ASU No. 2016-08, ASU No. 2016-10, ASU No. 2016-12. 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 four step process to be applied by an entity in evaluating its contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which formally deferred the effective date by one year to make the guidance of ASU No. 2014-09 effective for annual reporting periods beginning after December 15, 2017, including interim periods therein. Early adoption is permitted, but not prior to the original effective date, which was for annual reporting periods beginning after December 15, 2016. The Company is working through an adoption plan which includes the evaluation of revenue contracts compared to the new standard and evaluating the impact of Topic 606 on the Company' results of operations, cash flows and financial position.

Business Acquisitions

Business Acquisitions	9 Months Ended
	Sep. 30, 2016
Business Combinations [Abstract]
Business Acquisition	Business Acquisitions 2016 Acquisitions CVSR Drop Down — Prior to September 1, 2016, the Company had a 48.95% interest in CVSR, which was accounted for as an equity method investment. On September 1, 2016, the Company acquired from NRG the remaining 51.05% interest of CVSR Holdco LLC, which indirectly owns the CVSR solar facility, for total cash consideration of $78.5 million plus an immaterial working capital adjustment. The Company also assumed additional debt of $496 million , which represents 51.05% of the CVSR project level debt and 51.05% of the notes issued under the CVSR Holdco Financing Agreement, as further described in Note 7, Long-term Debt , as of the closing date. The acquisition was funded with cash on hand. The assets and liabilities transferred to the Company relate to interests under common control by NRG and were recorded at historical cost in accordance with ASC 805-50, Business Combinations - Related Issues . The difference between the cash paid and historical value of the entities' equity was recorded as a distribution to NRG with the offset to noncontrolling interest. Because the transaction constituted a transfer of net assets under common control, the guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect since the inception of common control. In connection with the retrospective adjustment of prior periods, the Company has removed the equity method investment from all prior periods and adjusted its financial statements to reflect its results of operations, financial position and cash flows as if it had consolidated CVSR from the beginning of the financial statement period. As of June 30, 2016, the Company's recast consolidated balance sheet included a net receivable of $ 67 million related to current litigation with SunPower pursuant to indemnities in the project. The agreement between NRG and the Company for the CVSR Drop Down acquisition specified that all amounts related to the litigation with SunPower were excluded from the acquisition. Accordingly, prior to close of the transaction, the net receivable was transferred to NRG as a net reduction to its ownership interest in CVSR. The following is the summary of historical net liabilities assumed in connection with the CVSR Drop Down as of September 1, 2016: CVSR (In millions) Current assets $ 95 Property, plant and equipment 826 Non-current assets 13 Total assets 934 Debt (a) 966 Other current and non-current liabilities 12 Total liabilities 978 Net liabilities assumed (44 ) Accumulated Other Comprehensive Loss (25 ) Historical Net Liabilities Assumed $ (19 ) (a) Net of deferred financing costs of $5 million . Since the acquisition date, CVSR has contributed $9 million in operating revenues and $4 million in net income to the Company. The following tables present the historical information summary combining the financial information for the CVSR Drop Down transferred in connection with the acquisition: December 31, 2015 As Previously Reported CVSR As Currently Reported Current assets $ 321 $ 98 $ 419 Property, plant and equipment 5,056 822 5,878 Non-current assets 2,231 (6 ) 2,225 Total assets 7,608 914 8,522 Debt 4,835 790 5,625 Other current and non-current liabilities 339 18 357 Total liabilities 5,174 808 5,982 Net assets $ 2,434 $ 106 $ 2,540 Three months ended September 30, 2015 As Previously Reported (a) CVSR As Currently Reported Total operating revenues $ 225 $ 31 $ 256 Operating income 81 21 102 Net income 36 8 44 (a) Previously reported in Note 15, Unaudited Quarterly Data, to the Company's consolidated financial statements included in the 2015 Form 10-K . Nine months ended September 30, 2015 As Previously Reported (a) CVSR As Currently Reported Total operating revenues $ 660 $ 69 $ 729 Operating income 212 39 251 Net income 57 11 68 (a) Previously reported in Note 15, Unaudited Quarterly Data, to the Company's consolidated financial statements included in the 2015 Form 10-K . 2015 Acquisitions November 2015 Drop Down Assets from NRG — On November 3, 2015, the Company acquired the November 2015 Drop Down Assets, a portfolio of 12 wind facilities totaling 814 net MW, from NRG for cash consideration of $209 million , subject to working capital adjustments. In February 2016, NRG made a final working capital payment of $2 million , reducing total cash consideration to $207 million . The Company is responsible for its pro-rata share of non-recourse project debt of $193 million and noncontrolling interest associated with a tax equity structure of $159 million (as of the acquisition date). The Company funded the acquisition with borrowings from its revolving credit facility. The assets and liabilities transferred to the Company relate to interests under common control by NRG and were recorded at historical cost. The difference between the cash paid and historical value of the entities' equity was recorded as a distribution from NRG with the offset to contributed capital. The Class A interests of NRG Wind TE Holdco 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 8.53% . The Company generally receives 75% of CAFD until the flip point, at which time the allocations to the Company of CAFD change to 68.60% . If the flip point has not occurred by a specified date, 100% of CAFD is allocated to the TE Investor until the flip point occurs. NRG Wind TE Holdco is a VIE and the Company is the primary beneficiary, through its position as managing member, and consolidates NRG Wind TE Holdco. Desert Sunlight — On June 29, 2015, the Company acquired 25% of the membership interest in Desert Sunlight Investment Holdings, LLC, which owns two solar photovoltaic facilities that total 550 MW, located in Desert Center, California from EFS Desert Sun, LLC, an affiliate of GE Energy Financial Services for a purchase price of $285 million . Power generated by the facilities is sold to Southern California Edison and Pacific Gas and Electric under long-term PPAs with approximately 20 years and 25 years of remaining contract life, respectively. The Company accounts for its 25% investment as an equity method investment. Spring Canyon — On May 7, 2015, the Company acquired a 90.1% interest in Spring Canyon II, a 32 MW wind facility, and Spring Canyon III, a 28 MW wind facility, each located in Logan County, Colorado, from Invenergy Wind Global LLC. The purchase price was funded with cash on hand. Power generated by Spring Canyon II and Spring Canyon III is sold to Platte River Power Authority under long-term PPAs with approximately 24 years of remaining contract life. University of Bridgeport Fuel Cell — On April 30, 2015, the Company completed the acquisition of the University of Bridgeport Fuel Cell project in Bridgeport, Connecticut from FuelCell Energy, Inc. The project added an additional 1.4 MW of thermal capacity to the Company's portfolio, with a 12 -year contract, with the option for a 7 -year extension. The acquisition is reflected in the Company's Thermal segment. January 2015 Drop Down Assets from NRG — On January 2, 2015, the Company acquired the following projects from NRG: (i) Laredo Ridge, an 80 MW wind facility located in Petersburg, Nebraska, (ii) Tapestry, which includes Buffalo Bear, a 19 MW wind facility in Buffalo, Oklahoma; Taloga, a 130 MW wind facility in Putnam, Oklahoma; and Pinnacle, a 55 MW wind facility in Keyser, West Virginia, and (iii) Walnut Creek, a 485 MW natural gas facility located in City of Industry, California, for total cash consideration of $489 million , including $9 million for working capital, plus assumed project-level debt of $737 million . The Company funded the acquisition with cash on hand and drawings under its revolving credit facility. The assets and liabilities transferred to the Company relate to interests under common control by NRG and were recorded at historical cost. The difference between the cash paid and the historical value of the entities' equity of $61 million , as well as $23 million of AOCL, was recorded as a distribution to NRG and reduced the balance of its contributed capital.

Variable Interest Entities

Variable Interest Entities	9 Months Ended
	Sep. 30, 2016
Equity Method Investments and Joint Ventures [Abstract]
Investments Accounted for by the Equity Method and Variable Interest Entities	Entities that are Consolidated The Company has a controlling financial interest in certain entities which have been identified as VIEs under ASC 810, Consolidations, or ASC 810. These arrangements are primarily related to tax equity arrangements entered into with third parties in order to monetize certain tax credits associated with wind facilities, as further described in Note 5 , Investments Accounted for by the Equity Method and Variable Interest Entities , to the Company's consolidated financial statements included in the 2015 Form 10-K. Summarized financial information for the Company's consolidated VIEs consisted of the following as of September 30, 2016 : (In millions) NRG Wind TE Holdco Alta Wind TE Holdco Spring Canyon Other current and non-current assets $ 189 $ 19 $ 4 Property, plant and equipment 635 466 101 Intangible assets 2 278 — Total assets 826 763 105 Current and non-current liabilities 225 9 6 Total liabilities 225 9 6 Noncontrolling interest 209 118 69 Net assets less noncontrolling interests $ 392 $ 636 $ 30 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 consolidated financial statements included in the 2015 Form 10-K. NRG DGPV Holdco 1 LLC — The Company and NRG, maintain a partnership, NRG DGPV Holdco 1 LLC, or DGPV Holdco 1, the purpose of which is to own or purchase solar power generation projects and other ancillary related assets from NRG Renew LLC or its subsidiaries, via intermediate funds, including: (i) a tax equity-financed portfolio of 10 recently completed community solar projects representing approximately 8 MW with a weighted average remaining PPA term of 20 years ; and (ii) a tax equity-financed portfolio of approximately 12 commercial photovoltaic systems representing approximately 37 MW with a weighted average remaining PPA term of 19 years . Both of these investments relate to the Company's $100 million commitment to distributed solar projects in partnership with NRG. NRG DGPV Holdco 2 LLC — On February 29, 2016, the Company and NRG entered into an additional partnership by forming NRG DGPV Holdco 2 LLC, or DGPV Holdco 2, to own or purchase solar power generation projects representing approximately 7 MW with a weighted average remaining PPA term of 18 years as well as other ancillary related assets from NRG Renew LLC or its subsidiaries, via intermediate funds. Under this partnership, the Company committed to fund up to $50 million of capital. The Company's maximum exposure to loss is limited to its equity investment in DGPV Holdco 1 and DGPV Holdco 2, which was $77 million on a combined basis as of September 30, 2016 . NRG RPV Holdco 1 LLC — The Company and NRG Residential Solar Solutions LLC, a subsidiary of NRG, maintain a partnership, NRG RPV Holdco 1 LLC, or RPV Holdco, that holds operating portfolios of residential solar assets developed by NRG's residential solar business, including: (i) an existing, unlevered portfolio of over 2,000 leases across nine states representing approximately 15 MW with a weighted average remaining lease term of approximately 17 years that was acquired outside of the partnership; and (ii) a tax equity-financed portfolio of approximately 5,400 leases representing approximately 28 MW, with an average lease term for the existing and new leases of approximately 17 to 20 years . In addition to the acquisition of the unlevered portfolio of leases, the Company had previously committed to fund up to $150 million of capital to invest in the tax equity financed portfolio, which was reduced to $100 million in February 2016. On August 5, 2016, the Company and NRG amended the RPV Holdco partnership to further reduce that capital commitment of $100 million to $60 million in connection with NRG’s change in business model approach in the residential solar business. As of September 30, 2016, the Company had contributed $57 million of this amount. The Company's maximum exposure to loss is limited to its equity investment, which was $70 million as of September 30, 2016 . GenConn Energy LLC — The Company has a 50% interest in GCE Holding LLC, the owner of GenConn, which owns and operates two 190 MW peaking generation facilities in Connecticut at the Devon and Middletown sites. As of September 30, 2016 , the Company's investment in GenConn was $106 million and its maximum exposure to loss is limited to its equity investment. The following table presents summarized financial information for GCE Holding LLC: Three months ended September 30, Nine months ended September 30, (In millions) 2016 2015 2016 2015 Income Statement Data: Operating revenues $ 18 $ 21 $ 54 $ 61 Operating income 9 9 28 29 Net income $ 7 $ 6 $ 20 $ 20 September 30, 2016 December 31, 2015 Balance Sheet Data: (In millions) Current assets $ 29 $ 36 Non-current assets 403 416 Current liabilities 12 16 Non-current liabilities $ 208 $ 215

Fair Value of Financial Instrum

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2016
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, accounts payable — affiliate, accrued expenses and other liabilities, the carrying amounts approximate fair value because of the short-term maturity of those instruments and are classified as Level 1 within the fair value hierarchy. The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows: As of September 30, 2016 As of December 31, 2015 (a) Carrying Amount Fair Value Carrying Amount Fair Value (In millions) Assets: Notes receivable, including current portion $ 35 $ 35 $ 47 $ 47 Liabilities: Long-term debt — affiliate 618 614 618 553 Long-term debt — external, including current portion $ 5,100 $ 5,108 $ 5,060 $ 4,974 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non-publicly traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of September 30, 2016 and December 31, 2015: As of September 30, 2016 As of December 31, 2015 Level 2 Level 3 Level 2 Level 3 (In millions) Long-term debt, including current portion $ 850 $ 4,872 $ 413 $ 5,114 Recurring Fair Value Measurements The Company records its derivative assets and liabilities at fair value on its consolidated balance sheet. There were no derivative asset positions on the Company's consolidated balance sheet as of December 31, 2015 . The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy: As of September 30, 2016 As of December 31, 2015 Fair Value (a) Fair Value (a) (In millions) Level 2 Level 2 Derivative assets: Commodity contracts $ 1 $ — Total assets 1 — Derivative liabilities: Commodity contracts 1 2 Interest rate contracts 138 98 Total liabilities $ 139 $ 100 (a) There were no derivative assets or liabilities classified as Level 1 or Level 3 as of September 30, 2016 , and December 31, 2015 . Derivative Fair Value Measurements The Company's contracts are non-exchange-traded and valued using prices provided by external sources. For the Company’s energy markets, management receives quotes from multiple sources. To the extent that multiple quotes are received, the prices reflect the average of the bid-ask mid-point prices obtained from all sources believed to provide the most liquid market for the commodity. The fair value of each contract is discounted using a risk free interest rate. In addition, a credit reserve is applied to reflect credit risk, which is, for interest rate swaps, calculated based on credit default swaps using the bilateral method. For commodities, to the extent that the net exposure under a specific master agreement is an asset, the Company uses the counterparty’s default swap rate. If the net exposure under a specific master agreement is a liability, the Company uses NRG's default swap rate. For interest rate swaps and commodities, the credit reserve is added to the discounted fair value to reflect the exit price that a market participant would be willing to receive to assume the liabilities or that a market participant would be willing to pay for the assets. As of September 30, 2016 , the credit reserve resulted in a $4 million increase in fair value, which was composed of a $3 million gain in OCI and $1 million reduction 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 consolidated financial statements included in the Company's 2015 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 September 30, 2016 , credit risk exposure to these counterparties attributable to the Company's ownership interests was approximately $2.6 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 11 , Segment Reporting , to the Company's consolidated financial statements included in the Company's 2015 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)	9 Months Ended
	Sep. 30, 2016
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 consolidated financial statements included in the Company's 2015 Form 10-K. Energy-Related Commodities As of September 30, 2016 , the Company had forward contracts for the purchase of fuel commodities relating to the forecasted usage of the Company’s district energy centers extending through 2018. At September 30, 2016 , these contracts were not designated as cash flow or fair value hedges. Interest Rate Swaps As of September 30, 2016 , the Company had interest rate derivative instruments on non-recourse debt extending through 2031, most of which are designated as cash flow hedges. Volumetric Underlying Derivative Transactions The following table summarizes the net notional volume buy/(sell) of the Company's open derivative transactions broken out by commodity: Total Volume September 30, 2016 December 31, 2015 (a) Commodity Units (In millions) Natural Gas MMBtu 3 4 Interest Dollars $ 1,875 $ 1,991 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . Fair Value of Derivative Instruments There were no derivative asset positions on the balance sheet as of December 31, 2015 . The following table summarizes the fair value within the derivative instrument valuation on the balance sheet: Fair Value Derivative Assets Derivative Liabilities September 30, 2016 September 30, 2016 December 31, 2015 (a) (In millions) Derivatives Designated as Cash Flow Hedges: Interest rate contracts current $ — $ 29 $ 34 Interest rate contracts long-term — 94 56 Total Derivatives Designated as Cash Flow Hedges — 123 90 Derivatives Not Designated as Cash Flow Hedges : Interest rate contracts current — 2 3 Interest rate contracts long-term — 13 5 Commodity contracts current 1 1 2 Total Derivatives Not Designated as Cash Flow Hedges 1 16 10 Total Derivatives $ 1 $ 139 $ 100 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. As of September 30, 2016 , and December 31, 2015 , there were no offsetting amounts at the counterparty master agreement level or outstanding collateral paid or received. Accumulated Other Comprehensive Loss The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives: Three months ended September 30, Nine months ended September 30, 2016 2015 (a) 2016 2015 (a) (In millions) Accumulated OCL beginning balance (a) $ (168 ) $ (83 ) $ (99 ) $ (82 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 6 6 13 13 Mark-to-market of cash flow hedge accounting contracts 14 (46 ) (62 ) (54 ) Accumulated OCL ending balance (148 ) (123 ) (148 ) (123 ) Accumulated OCL attributable to noncontrolling interests (4 ) (3 ) (4 ) (3 ) Accumulated OCL attributable to NRG Yield LLC $ (144 ) $ (120 ) $ (144 ) $ (120 ) Losses expected to be realized from OCL during the next 12 months $ 20 $ 20 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . 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 and nine months ended September 30, 2016 and 2015 . Impact of Derivative Instruments on the Statements of Income The Company has interest rate derivative instruments that are not designated as cash flow hedges. The effect of interest rate hedges is recorded to interest expense. For the three months ended September 30, 2016 , and 2015 , the impact to the consolidated statements of income was a gain of $2 million and a loss of $6 million , respectively. For the nine months ended September 30, 2016 , and 2015 , the impact to the consolidated statements of income was a loss of $7 million and a gain of $13 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. In 2015, certain NRG subsidiaries entered into commodity contracts with NRG Power Marketing and NRG Texas Power LLC. The purpose of these commodity contracts was to hedge the forecasted sale of power for Elbow Creek, Goat Wind, Alta X and Alta XI until the start of the PPAs. The effect of these commodity hedges was recorded to operating revenues, as described in Note 9, Related Party Transactions. For the three and nine months ended September 30, 2015 , the impact to the consolidated statements of income was an unrealized loss of $2 million and an unrealized gain of $1 million , respectively. See Note 5 , Fair Value of Financial Instruments , for a discussion regarding concentration of credit risk.

Long-term Debt

Long-term Debt	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Long-term Debt	Long-term Debt This footnote should be read in conjunction with the complete description under Note 9, Long-term Debt , to the Company's consolidated financial statements included in the 2015 Form 10-K. Long-term debt consisted of the following: September 30, 2016 December 31, 2015 (c) September 30, 2016, interest rate % (a) Letters of Credit Outstanding at September 30, 2016 (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 — 5.000 NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, due 2019 (b) — 306 L+2.75 $ 64 Project-level debt: Alpine, due 2022 147 154 L+1.75 37 Alta Wind I, lease financing arrangement, due 2034 245 252 7.015 16 Alta Wind II, lease financing arrangement, due 2034 194 198 5.696 23 Alta Wind III, lease financing arrangement, due 2034 201 206 6.067 23 Alta Wind IV, lease financing arrangement, due 2034 130 133 5.938 16 Alta Wind V, lease financing arrangement, due 2035 208 213 6.071 26 Alta Realty Investments, due 2031 32 33 7.000 — Alta Wind Asset Management, due 2031 18 19 L+2.375 — Avra Valley, due 2031 57 60 L+1.75 3 Blythe, due 2028 20 21 L+1.625 6 Borrego, due 2025 and 2038 70 72 L+ 2.50/5.65 5 CVSR, due 2037 771 793 2.339 - 3.775 — CVSR Holdco, due 2037 199 — 4.68 13 El Segundo Energy Center, due 2023 443 485 L+1.625 - L+2.25 82 Energy Center Minneapolis, due 2017 and 2025 98 108 5.95 -7.25 — Kansas South, due 2031 31 33 L+2.00 4 Laredo Ridge, due 2028 101 104 L+1.875 10 Marsh Landing, due 2017 and 2023 385 418 L+1.75 - L+1.875 33 PFMG and related subsidiaries financing agreement, due 2030 28 29 6.000 — Roadrunner, due 2031 37 40 L+1.625 5 South Trent Wind, due 2020 58 62 L+1.625 10 TA High Desert, due 2020 and 2032 51 52 L+2.50/5.15 8 Tapestry, due 2021 175 181 L+1.625 20 Viento, due 2023 183 189 L+2.75 27 Walnut Creek, due 2023 322 351 L+1.625 49 WCEP Holdings, due 2023 46 46 L+3.00 — Other — 2 various — Subtotal project-level debt: 4,250 4,254 Total debt 5,718 5,678 Less current maturities 281 264 Less deferred financing costs 55 53 Total long-term debt $ 5,382 $ 5,361 (a) As of September 30, 2016 , L+ equals 3 month LIBOR plus x%, except for the Alpine term loan, Marsh Landing term loan, 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 and Viento, where L+ equals 6 month LIBOR plus x%. (b) Applicable rate is determined by the borrower leverage ratio, as defined in the credit agreement. (c) Retrospectively adjusted as discussed in Note 1, Nature of Business . The financing arrangements listed above contain certain covenants, including financial covenants that the Company is required to be in compliance with during the term of the respective arrangement. As of September 30, 2016 , the Company was in compliance with all of the required covenants. The discussion below describes material changes to or additions of long-term debt for the nine months ended September 30, 2016 . NRG Yield Operating LLC 2026 Senior Notes On August 18, 2016, Yield Operating LLC issued $350 million of senior unsecured notes, or the 2026 Senior Notes. The 2026 Senior Notes bear interest at 5.00% and mature on September 15, 2026. Interest on the notes is payable semi-annually on March 15 and September 15 of each year, and interest payments will commence on March 15, 2017. The 2026 Senior Notes are senior unsecured obligations of Yield Operating LLC and are guaranteed by NRG Yield LLC, and by certain of Yield Operating LLC’s wholly owned current and future subsidiaries. A portion of the proceeds of the 2026 Senior Notes were used to repay the revolving credit facility, as described below. CVSR Holdco Financing Arrangement On July 15, 2016, CVSR Holdco, the indirect owner of the CVSR solar facility, issued $200 million of senior secured notes, or the 2037 Notes, that bear interest at 4.68% and mature on March 31, 2037. Net proceeds were distributed to the Company and NRG based on their respective ownership as of July 15, 2016, and accordingly, the Company received net proceeds of $97.5 million . As described in Note 3 , Business Acquisitions , on September 1, 2016, the Company acquired the remaining 51.05% of CVSR, and assumed additional debt of $496 million , which represents 51.05% of the CVSR project level debt and the 2037 Notes. In connection with the retrospective adjustment of prior periods, as described in Note 1, Nature of Business , the Company now consolidates CVSR and 100% of its debt, in all periods presented. NRG Yield LLC and Yield Operating LLC Revolving Credit Facility The Company borrowed $60 million from the revolving credit facility and repaid $366 million during the nine months ended September 30, 2016 . The Company used its pro rata proceeds of $97.5 million from the CVSR Holdco Financing Arrangement, as described above, along with $28 million of cash on hand, to reduce borrowings under the Company’s revolving credit facility in July 2016. Additionally, in August 2016, the Company used a portion of its proceeds from the issuance of the 2026 Senior Notes to pay the remaining revolver balance of $193 million . As of September 30, 2016 , there were no outstanding borrowings under the revolving credit facility and the Company had $64 million of letters of credit outstanding. Thermal Financing On October 31, 2016, NRG Energy Center Minneapolis LLC, a subsidiary of NRG Thermal LLC, received proceeds of $125 million from the issuance of 3.55% Series D notes due October 31, 2031, or the Series D Notes, and entered into a shelf facility for the anticipated issuance of an additional $70 million of notes. The Series D Notes are, and the additional notes, if issued, will be secured by substantially all of the assets of NRG Energy Center Minneapolis LLC. NRG Thermal LLC has guaranteed the indebtedness and its guarantee is secured by a pledge of the equity interests in all of NRG Thermal LLC’s subsidiaries. NRG Energy Center Minneapolis LLC distributed the proceeds of the Series D Notes to NRG Thermal LLC, which in turn distributed the proceeds to NRG Yield Operating LLC to be utilized for general corporate purposes, including potential acquisitions.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2016
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, depreciation and amortization, or Adjusted EBITDA, and CAFD, as well as economic gross margin and net income (loss). Three months ended September 30, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 82 $ 142 $ 48 $ — $ 272 Cost of operations 14 31 31 — 76 Depreciation and amortization 20 50 5 — 75 General and administrative — — — 3 3 Operating income (loss) 48 61 12 (3 ) 118 Equity in earnings of unconsolidated affiliates 3 10 — — 13 Other income, net 1 — — — 1 Interest expense (13 ) (37 ) (2 ) (16 ) (68 ) Net Income (Loss) $ 39 $ 34 $ 10 $ (19 ) $ 64 Total Assets $ 2,001 $ 5,783 $ 427 $ 90 $ 8,301 Three months ended September 30, 2015 (a) (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 86 $ 124 $ 46 $ — $ 256 Cost of operations 15 36 31 — 82 Depreciation and amortization 19 45 5 — 69 General and administrative — — — 2 2 Acquisition-related transaction and integration costs — — — 1 1 Operating income (loss) 52 43 10 (3 ) 102 Equity in earnings of unconsolidated affiliates 3 9 — — 12 Loss on debt extinguishment — (2 ) — — (2 ) Interest expense (11 ) (41 ) (1 ) (15 ) (68 ) Net Income (Loss) $ 44 $ 9 $ 9 $ (18 ) $ 44 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . Nine months ended September 30, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 246 $ 412 $ 131 $ — $ 789 Cost of operations 53 98 87 — 238 Depreciation and amortization 60 149 15 — 224 General and administrative — — — 8 8 Operating income (loss) 133 165 29 (8 ) 319 Equity in earnings of unconsolidated affiliates 10 19 — — 29 Other income, net 1 2 — — 3 Interest expense (36 ) (115 ) (5 ) (48 ) (204 ) Net Income (Loss) $ 108 $ 71 $ 24 $ (56 ) $ 147 Nine months ended September 30, 2015 (a) (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 247 $ 347 $ 135 $ — $ 729 Cost of operations 51 99 96 — 246 Depreciation and amortization 61 147 14 — 222 General and administrative — — — 8 8 Acquisition-related transaction and integration costs — — — 2 2 Operating income (loss) 135 101 25 (10 ) 251 Equity in earnings of unconsolidated affiliates 10 9 — — 19 Other income, net 1 1 — — 2 Loss on debt extinguishment (7 ) (2 ) — — (9 ) Interest expense (36 ) (116 ) (5 ) (38 ) (195 ) Net Income (Loss) $ 103 $ (7 ) $ 20 $ (48 ) $ 68 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business .

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2016
Related Party Transactions [Abstract]
Related Party Transactions Disclosure	Related Party Transactions In addition to the transactions and relationships described elsewhere in these notes to the consolidated financial statements, NRG and certain subsidiaries of NRG provide services to the Company and its project entities. Amounts due to NRG subsidiaries are recorded as accounts payable - affiliate and amounts due to the Company from NRG or its subsidiaries are recorded as accounts receivable - affiliate in the Company's balance sheet. Power Hedge Contracts by and between Renewables segment Entities and NRG Certain NRG Wind TE Holdco entities, which are subsidiaries in the Renewables segment, entered into power hedge contracts with NRG Texas Power LLC and generated $17 million during the nine months ended September 30, 2015 . Effective October 2015, Elbow Creek, one of the NRG Wind TE Holdco entities, entered into a PPA with NRG Power Marketing LLC, or NRG Power Marketing, as further described below, and the hedge agreement between Elbow Creek and NRG Texas Power LLC was terminated. Additionally, Alta X and Alta XI entered into a hedge agreement with NRG Power Marketing, as further described in Note 6 , Accounting for Derivative Instruments and Hedging Activities , to hedge the forecasted sale of power until the start of the PPAs on January 1, 2016. Power Purchase Agreement 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 $6 million of revenue during the nine months ended September 30, 2016 . 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 $15 million and $21 million for the nine months ended September 30, 2016 and 2015 , respectively. There was a balance of $23 million and $29 million due to NRG in accounts payable — affiliate as of September 30, 2016 and December 31, 2015 , respectively. As of September 30, 2016 , $12 million of the balance was recorded in the current liabilities of the consolidated balance sheet and $11 million was recorded in long term liabilities of the consolidated balance sheet. Subsequent to September 30, 2016 , the Company made payments of $4 million to reduce the outstanding balance due to NRG. Power Purchase Agreement by and between NRG Energy Center Dover LLC and NRG In February 2016, NRG Energy Center Dover LLC, or NRG Dover, a subsidiary of the Company, entered into a PPA with NRG Power Marketing for the sale of energy and environmental attributes with an effective date of February 1, 2016 and expiration date of December 31, 2018. NRG Dover generated $4 million of revenue during the nine months ended September 30, 2016 . The agreement in place is in addition to the existing Power Sales and Services Agreement described further below. Power Sales and Services Agreement by and between NRG Energy Center Dover LLC and NRG NRG Dover, a subsidiary of the Company, is party to a Power Sales and Services Agreement with NRG Power Marketing. The agreement is automatically renewed on a month-to-month basis unless terminated by either party upon at least 30 days written notice. Under the agreement, NRG Power Marketing has the exclusive right to (i) manage, market and sell power, (ii) procure fuel and fuel transportation for operation of the Dover generating facility, to include for purposes other than generating power, (iii) procure transmission services required for the sale of power, and (iv) procure and market emissions credits for operation of the Dover generating facility. In addition, NRG Power Marketing has the exclusive right and obligation to direct the output from the generating facility, in accordance with and to meet the terms of any power sales contracts executed against the power generation of the Dover facility. Under the agreement, NRG Power Marketing pays NRG Dover gross receipts generated through sales, less costs incurred by NRG Power Marketing related to providing such services as transmission and delivery costs, as well as fuel costs. In July 2013, the coal-fueled plant was converted to a natural gas facility. For the nine months ended September 30, 2016 and 2015 , NRG Dover purchased $1 million and $4 million , respectively, of natural gas from NRG Power Marketing. 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 nine months ended September 30, 2016 and 2015 , NRG Minneapolis purchased $5 million and $6 million , respectively, of natural gas from NRG Power Marketing. O&M Services Agreements by and between GenConn and NRG GenConn incurs fees under two O&M services agreements with wholly-owned subsidiaries of NRG. The fees incurred under the agreements were $4 million and $3 million for the nine months ended September 30, 2016 and 2015 , respectively. O&M Services Agreement by and between El Segundo and NRG El Segundo incurs fees under an O&M services agreement with NRG El Segundo Operations, Inc., a wholly-owned subsidiary of NRG. Under the O&M services agreement, NRG El Segundo Operations, Inc. manages, operates and maintains the El Segundo facility for an initial term of ten years following the commercial operations date. For the nine months ended September 30, 2016 and 2015 , the costs incurred under the agreement were $4 million . There was a balance of $1 million due to NRG El Segundo in accounts payable — affiliate as of September 30, 2016 , and December 31, 2015 . Administrative Services Agreement by and between Marsh Landing and NRG Marsh Landing is a party to an administrative services agreement with GenOn Energy Services, LLC, a wholly-owned subsidiary of NRG, which provides invoice processing and payment on behalf of Marsh Landing. Marsh Landing reimburses GenOn Energy Services, LLC for the amounts paid by it. The Company reimbursed costs under this agreement of $9 million and $11 million for the nine months ended September 30, 2016 and 2015 , respectively. There was a balance of $1 million and $6 million due to GenOn Energy Services, LLC in accounts payable — affiliate as of September 30, 2016 and December 31, 2015 , respectively. Administrative Services Agreement by and between CVSR and NRG CVSR is a party to an administrative services agreement with NRG Renew Operation & Maintenance LLC, a wholly-owned subsidiary of NRG, which provides O&M services on behalf of CVSR. Initially, the agreement was entered into with NRG Energy Services and was subsequently assigned to NRG Renew Operation & Maintenance LLC on July 15, 2015. The Company reimbursed a total of $2 million and $4 million to both entities for the expenses incurred for the nine months ended September 30, 2016 and 2015 , respectively. Management Services Agreement by and between the Company and NRG NRG provides the Company with various operation, management, and administrative services, which include human resources, accounting, tax, legal, information systems, treasury, and risk management, as set forth in the Management Services Agreement. As of September 30, 2016 , the base management fee was approximately $7.5 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 future acquisitions and as a result of a change in the scope of services provided under the Management Services Agreement. During the nine months ended September 30, 2016 , the fee was increased by $0.5 million on an annual basis primarily due to the acquisition of the CVSR Drop Down. Costs incurred under this agreement were $6 million for the nine months ended September 30, 2016 and 2015 , 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 $3 million due to NRG in accounts payable — affiliate as of September 30, 2016 . Subsequent to September 30, 2016 , the balance has been paid in full. Administrative Services Agreements by and between NRG Wind TE Holdco and NRG Certain subsidiaries of NRG have entered into agreements with the Company's project entities to provide operation and maintenance services for the balance of the plants not covered by turbine supplier's maintenance and service agreements for the post-warranty period. The agreements have various terms with provisions for extension until terminated. For the nine months ended September 30, 2016 and 2015 , the costs incurred under the agreements were $4 million and $3 million , respectively. Certain subsidiaries of NRG provide support services to the NRG Wind TE Holdco project entities pursuant to various support services agreements. The agreements provide for administrative and support services and reimbursements of certain insurance, consultant, and credit costs. For the nine months ended September 30, 2016 and 2015 , the costs incurred under the agreements were $2 million .

Condensed Consolidating Financi

Condensed Consolidating Financial Information Condensed Consolidating Financial Information	9 Months Ended
	Sep. 30, 2016
Condensed Consolidating Financial Information Disclosure [Abstract]
Condensed Financial Statements [Text Block]	Condensed Consolidating Financial Information As of September 30, 2016 , 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 7 , 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 September 30, 2016 : 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 3 , Business Acquisitions , the Company completed the acquisition of the CVSR Drop Down and November 2015 Drop Down Assets from NRG on September 1, 2016, and November 3, 2015, 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. The Company has recorded all minority interests in NRG Wind TE Holdco as noncontrolling interest in the Consolidated Financial Statements for all periods presented. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Three Months Ended September 30, 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 $ — $ 7 $ 265 $ — $ — $ 272 Operating Costs and Expenses Cost of operations — 3 73 — — 76 Depreciation and amortization — 2 73 — — 75 General and administrative — — — 3 — 3 Total operating costs and expenses — 5 146 3 — 154 Operating Income (Loss) — 2 119 (3 ) — 118 Other Income (Expense) Equity in earnings of consolidated affiliates 100 4 — 70 (174 ) — Equity in earnings of unconsolidated affiliates — (1 ) — 14 — 13 Other income, net — — 1 — — 1 Interest expense — — (51 ) (17 ) — (68 ) Total other income (expense), net 100 3 (50 ) 67 (174 ) (54 ) Net Income 100 5 69 64 (174 ) 64 Less: Net loss attributable to noncontrolling interests — — (1 ) (36 ) 1 (36 ) Net Income Attributable to $ 100 $ 5 $ 70 $ 100 $ (175 ) $ 100 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Nine Months Ended September 30, 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 $ — $ 17 $ 772 $ — $ 789 Operating Costs and Expenses Cost of operations — 10 228 — — 238 Depreciation and amortization — 4 220 — — 224 General and administrative — — — 8 — 8 Total operating costs and expenses — 14 448 8 — 470 Operating Income (Loss) — 3 324 (8 ) — 319 Other Income (Expense) Equity in earnings of consolidated affiliates 209 21 — 178 (408 ) — Equity in earnings (losses) of unconsolidated affiliates — 6 (2 ) 25 — 29 Other income, net — — 3 — — 3 Interest expense — — (156 ) (48 ) — (204 ) Total other income (expense), net 209 27 (155 ) 155 (408 ) (172 ) Net Income 209 30 169 147 (408 ) 147 Less: Net loss attributable to noncontrolling interests — — (1 ) (62 ) 1 (62 ) Net Income Attributable to $ 209 $ 30 $ 170 $ 209 $ (409 ) $ 209 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the Three Months Ended September 30, 2016 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income $ 100 $ 5 $ 69 $ 64 $ (174 ) $ 64 Other Comprehensive Income Unrealized gain on derivatives 11 — 18 20 (29 ) 20 Other comprehensive income 11 — 18 20 (29 ) 20 Comprehensive Income 111 5 87 84 (203 ) 84 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (26 ) — (27 ) Comprehensive Income Attributable to NRG Yield LLC $ 111 $ 5 $ 88 $ 110 $ (203 ) $ 111 (a) All significant intercompany transactions have been eliminated in consolidation. For the Nine Months Ended September 30, 2016 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income $ 209 $ 30 $ 169 $ 147 $ (408 ) $ 147 Other Comprehensive Loss Unrealized loss on derivatives (49 ) — (45 ) (49 ) 94 (49 ) Other comprehensive loss (49 ) — (45 ) (49 ) 94 (49 ) Comprehensive Income 160 30 124 98 (314 ) 98 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (61 ) — (62 ) Comprehensive Income Attributable to NRG Yield LLC $ 160 $ 30 $ 125 $ 159 $ (314 ) $ 160 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS September 30, 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 $ 87 $ — $ 113 $ — $ — $ 200 Restricted cash — — 138 — — 138 Accounts receivable — trade — 3 112 — — 115 Accounts receivable — affiliate 2 — 1 — — 3 Inventory — 2 35 — — 37 Derivative instruments — — 1 — — 1 Notes receivable — — 17 — — 17 Prepayments and other current assets — — 20 1 — 21 Total current assets 89 5 437 1 — 532 Net property, plant and equipment — 58 5,653 — — 5,711 Other Assets Investment in consolidated subsidiaries 1,779 540 — 3,132 (5,451 ) — Equity investments in affiliates — 76 160 454 — 690 Notes receivable — — 18 — — 18 Intangible assets, net — 56 1,247 — — 1,303 Other non-current assets — — 45 2 — 47 Total other assets 1,779 672 1,470 3,588 (5,451 ) 2,058 Total Assets $ 1,868 $ 735 $ 7,560 $ 3,589 $ (5,451 ) $ 8,301 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS (Continued) September 30, 2016 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 $ — $ — $ 281 $ — $ — $ 281 Accounts payable — 2 18 3 — 23 Accounts payable — affiliate — 4 18 7 — 29 Derivative instruments — — 32 — — 32 Accrued expenses and other current liabilities — 1 81 12 — 94 Total current liabilities — 7 430 22 — 459 Other Liabilities Long-term debt — external — — 3,925 839 — 4,764 Long-term debt — affiliate — — — 618 — 618 Accounts payable — affiliate — — 11 — — 11 Derivative instruments — — 107 — — 107 Other non-current liabilities — — 78 — — 78 Total non-current liabilities — — 4,121 1,457 — 5,578 Total Liabilities — 7 4,551 1,479 — 6,037 Commitments and Contingencies Members' Equity Contributed capital 1,848 784 2,929 1,832 (5,545 ) 1,848 Retained earnings (accumulated deficit) 164 (53 ) 156 91 (194 ) 164 Accumulated other comprehensive loss (144 ) (3 ) (141 ) (144 ) 288 (144 ) Noncontrolling interest — — 65 331 — 396 Total Members' Equity 1,868 728 3,009 2,110 (5,451 ) 2,264 Total Liabilities and Members’ Equity $ 1,868 $ 735 $ 7,560 $ 3,589 $ (5,451 ) $ 8,301 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Nine Months Ended September 30, 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 $ — $ 45 $ 361 $ 34 $ 440 Cash Flows from Investing Activities Intercompany transactions between Yield LLC and subsidiaries 145 — — (145 ) — Acquisition of Drop Down Assets, net of cash acquired — — — (77 ) (77 ) Capital expenditures — — (16 ) — (16 ) Increase in restricted cash — — (7 ) — (7 ) Decrease in notes receivable — — 11 — 11 Return of investment from unconsolidated affiliates — 3 — 13 16 Net investments in unconsolidated affiliates — (48 ) — (21 ) (69 ) Net Cash Provided by (Used in) Investing Activities 145 (45 ) (12 ) (230 ) (142 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement 54 — — (54 ) — Net contributions from noncontrolling interests — — — 7 7 Distributions to NRG for CVSR and NRG Wind TE Holdco — — (122 ) — (122 ) Payment of distributions (127 ) — (204 ) 204 (127 ) Payment of debt issuance costs — — (1 ) (5 ) (6 ) Net payments for the revolving credit facility — — — (306 ) (306 ) Proceeds from the issuance of long-term debt — external — — 200 350 550 Payments for long-term debt — — (204 ) — (204 ) Net Cash (Used in) Provided by Financing Activities (73 ) — (331 ) 196 (208 ) Net Decrease in Cash and Cash Equivalents 72 — 18 — 90 Cash and Cash Equivalents at Beginning of Period 15 — 95 — 110 Cash and Cash Equivalents at End of Period $ 87 $ — $ 113 $ — $ 200 NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Three Months Ended September 30, 2015 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (a) (b) Consolidated (In millions) Operating Revenues Total operating revenues $ — $ 7 $ 248 $ 1 $ — $ 256 Operating Costs and Expenses Cost of operations — 4 78 — — 82 Depreciation and amortization — 1 68 — — 69 General and administrative — — — 2 — 2 Acquisition-related transaction and integration costs — — — 1 — 1 Total operating costs and expenses — 5 146 3 — 154 Operating Income (Loss) — 2 102 (2 ) — 102 Other (Expense) Income Equity in earnings (losses) of consolidated affiliates 62 (9 ) — 48 (101 ) — Equity in earnings of unconsolidated affiliates — — — 12 — 12 Loss on debt extinguishment — — (2 ) — — (2 ) Interest expense — — (54 ) (14 ) — (68 ) Total other income (expense), net 62 (9 ) (56 ) 46 (101 ) (58 ) Net Income (Loss) 62 (7 ) 46 44 (101 ) 44 Less: Net income (loss) attributable to noncontrolling interests — — 2 (18 ) (2 ) (18 ) Net Income (Loss) Attributable to NRG Yield LLC $ 62 $ (7 ) $ 44 $ 62 $ (99 ) $ 62 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the Nine Months Ended September 30, 2015 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (a) (b) Consolidated (In millions) Operating Revenues Total operating revenues $ — $ 17 $ 703 $ 9 $ — $ 729 Operating Costs and Expenses Cost of operations — 11 235 — — 246 Depreciation and amortization — 3 219 — — 222 General and administrative — — — 8 — 8 Acquisition-related transaction and integration costs — — — 2 — 2 Total operating costs and expenses — 14 454 10 — 478 Operating Income — 3 249 (1 ) — 251 Other (Expense) Income Equity in income (losses) of consolidated affiliates 102 (28 ) — 88 (162 ) — Equity in earnings of unconsolidated affiliates — — — 19 — 19 Other income, net — — 2 — — 2 Loss on debt extinguishment — — (9 ) — — (9 ) Interest expense — — (157 ) (38 ) — (195 ) Total other expense, net 102 (28 ) (164 ) 69 (162 ) (183 ) Net Income (Loss) 102 (25 ) 85 68 (162 ) 68 Less: Net loss attributable to noncontrolling interests — — (2 ) (34 ) 2 (34 ) Net Income (Loss) Attributable to NRG Yield LLC $ 102 $ (25 ) $ 87 $ 102 $ (164 ) $ 102 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2015 NRG Yield LLC (b) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (b) NRG Yield Operating LLC (b) Eliminations (a)(b) Consolidated ASSETS (In millions) Current Assets Cash and cash equivalents $ 15 $ — $ 95 $ — $ — $ 110 Restricted cash — — 131 — — 131 Accounts receivable — trade — 1 100 — — 101 Accounts receivable — affiliate 55 4 6 10 (71 ) 4 Inventory — 2 34 — — 36 Notes receivable — — 17 3 (3 ) 17 Prepayments and other current assets — 1 19 — — 20 Total current assets 70 8 402 13 (74 ) 419 Net property, plant and equipment — 61 5,817 — — 5,878 Other Assets Investment in consolidated subsidiaries 2,010 548 — 3,477 (6,035 ) — Equity investments in affiliates — 70 176 451 — 697 Notes receivable — — 30 — — 30 Intangible assets, net — 57 1,305 — — 1,362 Other non-current assets — — 134 2 — 136 Total other assets 2,010 675 1,645 3,930 (6,035 ) 2,225 Total Assets $ 2,080 $ 744 $ 7,864 $ 3,943 $ (6,109 ) $ 8,522 (a) All significant intercompany transactions have been eliminated in consolidation. (b) Retrospectively adjusted as discussed in Note 1, Nature of Business . NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS (Continued) December 31, 2015 NRG Yield LLC (b) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (b) NRG Yield Operating LLC (b) Eliminations (a)(b) Consolidated LIABILITIES AND MEMBERS' EQUITY (In millions) Current Liabilities Current portion of long-term debt — external $ — $ — $ 267 $ — $ (3 ) $ 264 Accounts payable — 1 19 3 — 23 Accounts payable — affiliate — 8 46 104 (72 ) 86 Derivative instruments — 1 38 — — 39 Accrued expenses and other current liabilities — 1 58 17 — 76 Total current liabilities — 11 428 124 (75 ) 488 Other Liabilities Long-term debt — external — — 3,943 800 — 4,743 Long-term debt — affiliate — — — 618 — 618 Derivative instruments — — 61 — — 61 Other non-current liabilities — — 72 — — 72 Total non-current liabilities — — 4,076 1,418 — 5,494 Total Liabilities — 11 4,504 1,542 (75 ) 5,982 Commitments and Contingencies Members' Equity Contributed capital 2,082 821 3,397 2,014 (6,232 ) 2,082 Retained earnings (Accumulated deficit) 93 (85 ) (12 ) 93 4 93 Accumulated other comprehensive loss (95 ) (3 ) (96 ) (95 ) 194 (95 ) Noncontrolling Interest — — 71 389 — 460 Total Members' Equity 2,080 733 3,360 2,401 (6,034 ) 2,540 Total Liabilities and Members’ Equity $ 2,080 $ 744 $ 7,864 $ 3,943 $ (6,109 ) $ 8,522 (a) All significant intercompany transactions have been eliminated in consolidation. (b) Retrospectively adjusted as discussed in Note 1, Nature of Business . NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Nine Months Ended September 30, 2015 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) Consolidated (In millions) Net Cash (Used in) Provided by Operating Activities $ — $ 28 $ 224 $ 58 $ 310 Cash Flows from Investing Activities Intercompany transactions from Yield LLC to subsidiaries (501 ) — — 501 — Acquisition of businesses, net of cash acquired — — — (37 ) (37 ) Acquisition of Drop Down Assets, net of cash acquired — — — (489 ) (489 ) Capital expenditures — — (17 ) — (17 ) Increase in restricted cash — — (24 ) — (24 ) Decrease in notes receivable — — 13 — 13 Proceeds from renewable energy grants — — 22 — 22 Return of investment from unconsolidated affiliates — — — 16 16 Investments in unconsolidated affiliates — (19 ) — (332 ) (351 ) Net Cash Used in Investing Activities (501 ) (19 ) (6 ) (341 ) (867 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement (277 ) (9 ) — 286 — Net contributions from noncontrolling interests — — 4 119 123 Distributions to NRG for NRG Wind TE Holdco and CVSR — — (52 ) — (52 ) Proceeds from the issuance of Class C and Class A units 599 — — — 599 Payment of distributions (99 ) — — — (99 ) Proceeds from issuance of long-term debt affiliate — — — 281 281 Payment of debt issuance costs — — (6 ) (1 ) (7 ) Net borrowings from the revolving credit facility — — — 92 92 Proceeds from the issuance of long-term debt - external — — 5 — 5 Payments for long-term debt — — (175 ) (494 ) (669 ) Net Cash Provided by (Used in) Financing Activities 223 (9 ) (224 ) 283 273 Net Decrease in Cash and Cash Equivalents (278 ) — (6 ) — (284 ) Cash and Cash Equivalents at Beginning of Period 328 — 101 — 429 Cash and Cash Equivalents at End of Period $ 50 $ — $ 95 $ — $ 145 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business .

Commitments and Contingencies (

Commitments and Contingencies (Notes)	9 Months Ended
	Sep. 30, 2016
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. Braun v. NRG Yield, Inc. — On April 19, 2016, plaintiffs filed a putative class action lawsuit against NRG Yield, Inc., the current and former members of its board of directors individually, and other parties in California Superior Court in Kern County, CA. Plaintiffs allege various violations of the Securities Act due to the defendants’ alleged failure to disclose material facts related to low wind production prior to NRG Yield, Inc.'s June 22, 2015 Class C common stock offering. Plaintiffs seek compensatory damages, rescission, attorney’s fees and costs. On August 3, 2016, the court approved a stipulation entered into by the parties. The stipulation provided that the plaintiffs would file an amended complaint by August 19, 2016, which they did on August 18, 2016. The defendants filed demurrers and a motion challenging jurisdiction on October 18, 2016. Ahmed v. NRG Energy, Inc. and the NRG Yield Board of Directors — On September 15, 2016, plaintiffs filed a putative class action lawsuit against NRG Energy, Inc., the directors of NRG Yield, Inc., and other parties in the Delaware Chancery Court. The complaint alleges that the defendants breached their respective fiduciary duties with regard to the recapitalization of NRG Yield, Inc. common stock in 2015. The plaintiffs generally seek economic damages, attorney’s fees and injunctive relief. The defendants filed responsive pleadings on November 4, 2016.

Summary of Significant Accoun17

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2016
Accounting Policies [Abstract]
Distributions [Policy Text Block]	Distributions The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the nine months ended September 30, 2016 : Third Quarter 2016 Second Quarter 2016 First Quarter 2016 Distributions per Class A, B, C and D unit $ 0.24 $ 0.23 $ 0.225 On November 2, 2016 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.25 per unit payable on December 15, 2016 to unit holders of record as of December 1, 2016 . 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 2016-16 - In October 2016, the FASB issued ASU No. 2016-16, Income Taxes (Topic 740) , Intra-Entity Transfers of Assets Other Than Inventory, or ASU No. 2016-16. The amendments of ASU No. 2016-16 were issued to improve the accounting for the income tax consequences of intra-entity transfers of assets other than inventory. Current GAAP prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party which has resulted in diversity in practice and increased complexity within financial reporting. The amendments of ASU No. 2016-16 would require an entity to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs and do not require new disclosure requirements. The amendments of ASU No. 2016-16 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. 2016-16 should be applied on a modified retrospective basis through a cumulative-effect adjustment directly to retained earnings as of the beginning of the period of adoption. The Company is currently evaluating the impact of the standard on the Company’s results of operations, cash flows and financial position. ASU 2016-15 — In August 2016, the FASB issued ASU No. 2016-15, Statement of Cash Flows (Topic 230) , Classification of Certain Cash Receipts and Cash Payments, or ASU No. 2016-15. The amendments of ASU No. 2016-15 were issued to address eight specific cash flow issues for which stakeholders have indicated to the FASB that a diversity in practice existed in how entities were presenting and classifying these items in the statement of cash flows. The issues addressed by ASU No. 2016-15 include but are not limited to the classification of debt prepayment and debt extinguishment costs, payments made for contingent consideration for a business combination, proceeds from the settlement of insurance proceeds, distributions received from equity method investees and separately identifiable cash flows and the application of the predominance principle. The amendments of ASU No. 2016-15 are effective for public entities for fiscal years beginning after December 15, 2017 and interim periods in those fiscal years. Early adoption is permitted, including adoption in an interim fiscal period with all amendments adopted in the same period. The adoption of ASU No. 2016-15 is required to be applied retrospectively. The Company is currently evaluating the impact of the standard on the Company's statement of cash flows. ASU 2016-07 — In March 2016, the FASB issued ASU No. 2016-07, Investments - Equity Method and Joint Ventures (Topic 323), or ASU No. 2016-07. The amendments of ASU No. 2016-07 eliminate the requirement that when an investment qualifies for use of the equity method as a result of an increase in the level of ownership interest or degree of influence, an investor must adjust the investment, results of operations, and retained earnings retroactively on a step-by-step basis as if the equity method had been in effect during all previous periods that the investment had been held. The amendments require that the equity method investor add the cost of acquiring the additional interest in the investee to the current basis of the investor's previously held interest and adopt the equity method of accounting with no retroactive adjustment to the investment. In addition, ASU No. 2016-07 requires that an entity that has an available-for-sale equity security that becomes qualified for the equity method of accounting recognize through earnings the unrealized holding gain or loss in accumulated other comprehensive income at the date the investment becomes qualified for use of the equity method. The guidance in ASU No. 2016-07 is effective for fiscal years beginning after December 15, 2016, and interim periods within those annual periods. The adoption of ASU No. 2016-07 is required to be applied prospectively and early adoption is permitted. The Company does not expect the standard to have a material impact on its results of operations, cash flows and financial position. ASU 2016-02 — In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), or ASU No. 2016-02. The amendments of ASU No. 2016-02 complete the joint effort between the FASB and the International Accounting Standards Board, or IASB, to develop a common leasing standard for GAAP and International Financial Reporting Standards, or IFRS, 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. The guidance in ASU No. 2016-02 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, ASU No. 2016-02 expands the required quantitative and qualitative disclosures with regards to lease arrangements. The guidance in ASU No. 2016-02 is effective for fiscal years beginning after December 15, 2018, and interim periods within those annual periods. The adoption of ASU No. 2016-02 is required to be applied using a modified retrospective approach for the earliest period presented and early adoption is permitted. The Company is currently working through an adoption plan which includes the evaluation of lease contracts compared to the new standard and evaluating the impact of ASU No.2016-02 on the Company's results of operations, cash flows and financial position. ASU 2016-01 — In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities , or ASU No. 2016-01. The amendments of ASU No. 2016-01 eliminate available-for-sale classification of equity investments and require that equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be generally measured at fair value with changes in fair value recognized in net income. Further, the amendments require financial assets and financial liabilities to be presented separately in the notes to the financial statements, grouped by measurement category and form of financial asset. The guidance in ASU No. 2016-01 is effective for financial statements issued for fiscal years beginning after December 15, 2017, and interim periods within those annual periods. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position. ASU 2015-16 — In September 2015, the FASB issued ASU No. 2015-16, Business Combinations (Topic 805): Simplifying the Accounting for Measurement-Period Adjustments , or ASU No. 2015-16. The amendments of ASU No. 2015-16 require that an acquirer recognize measurement period adjustments to the provisional amounts recognized in a business combination in the reporting period during which the adjustments are determined. Additionally, the amendments of ASU No. 2015-16 require the acquirer to record in the same period's financial statements the effect on earnings of changes in depreciation, amortization or other income effects, if any, as a result of the measurement period adjustment, calculated as if the accounting had been completed at the acquisition date as well as disclosing on either the face of the income statement or in the notes the portion of the amount recorded in current period earnings that would have been recorded in previous reporting periods. The guidance in ASU No. 2015-16 is effective for financial statements issued for fiscal years beginning after December 15, 2015, and interim periods within those fiscal years. The amendments should be applied prospectively. The Company adopted this standard on January 1, 2016, and the adoption of this standard did not impact the Company's results of operations, cash flows or financial position. 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. The amendments of ASU No. 2014-09 complete the joint effort between the FASB and the IASB, to develop a common revenue standard for GAAP and IFRS, and to improve financial reporting. In addition to ASU No. 2014-09, the FASB has issued additional guidance which provides further clarification on Topic 606 including ASU No. 2016-08, ASU No. 2016-10, ASU No. 2016-12. 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 four step process to be applied by an entity in evaluating its contracts with customers. In August 2015, the FASB issued ASU No. 2015-14, which formally deferred the effective date by one year to make the guidance of ASU No. 2014-09 effective for annual reporting periods beginning after December 15, 2017, including interim periods therein. Early adoption is permitted, but not prior to the original effective date, which was for annual reporting periods beginning after December 15, 2016. The Company is working through an adoption plan which includes the evaluation of revenue contracts compared to the new standard and evaluating the impact of Topic 606 on the Company' results of operations, cash flows and financial position.
Noncontrolling Interest Disclosure [Text Block]	The following table reflects the changes in the Company's noncontrolling interest balance: (In millions) Balance as of December 31, 2015 460 Capital contributions from tax equity investors, net of distributions 7 Distributions to NRG for NRG Wind TE Holdco (9 ) Comprehensive loss (62 ) Balance as of September 30, 2016 $ 396

Segment Reporting Segment Repor

Segment Reporting Segment Reporting (Policies)	9 Months Ended
	Sep. 30, 2016
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, depreciation and amortization, or Adjusted EBITDA, and CAFD, as well as economic gross margin and net income (loss).

Nature of Business Nature of Bu

Nature of Business Nature of Business (Tables)	9 Months Ended
	Sep. 30, 2016
Nature of Business Disclosure [Abstract]
IPO of NRG Yield [Table Text Block]	The following table represents the structure of the Company as of September 30, 2016 :
Schedule of Ownership [Table Text Block]	As of September 30, 2016 , 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 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 610 Distributed Solar AZ DG Solar Projects 100 % 5 Various 2025 - 2033 PFMG DG Solar Projects 51 % 4 Various 2032 9 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 74.3 % 16 Corn Belt Power Cooperative 2027 Elbow Creek 75 % 92 NRG Power Marketing LLC 2022 Elkhorn Ridge 50.3 % 41 Nebraska Public Power District 2029 Forward 75 % 22 Constellation NewEnergy, Inc. 2017 Goat Wind 74.9 % 113 Dow Pipeline Company 2025 Hardin 74.3 % 11 Interstate Power and Light Company 2027 Laredo Ridge 100 % 80 Nebraska Public Power District 2031 Lookout 75 % 29 Southern Maryland Electric Cooperative 2030 Odin 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 56.3 % 68 Southwestern Public Service Company 2025 Sleeping Bear 75 % 71 Public Service Company of Oklahoma 2032 South Trent 100 % 101 AEP Energy Partners 2029 Spanish Fork 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 74.9 % 121 Southwestern Public Service Company 2027 1,999 Projects Percentage Ownership Net Capacity (MW) (a) Offtake Counterparty Expiration Thermal Thermal equivalent MWt (c) 100 % 1,315 Various Various NRG Dover Energy Center LLC 100 % 103 NRG Power Marketing LLC 2018 Thermal generation 100 % 20 Various Various 1,438 Total net capacity (excluding equivalent MWt) (d) 4,686 (a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016 . (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) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects, of which the Company's net interests are 41 MW and 49 , respectively, based on cash to be distributed. These projects are part of tax equity arrangements and are consolidated by NRG, as further described in Note 4 , Variable Interest Entities, or VIEs .

Summary of Significant Accoun20

Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Tables)	9 Months Ended
	Sep. 30, 2016
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 September 30, 2016 and December 31, 2015: September 30, 2016 December 31, 2015 (In millions) Property, Plant and Equipment Accumulated Depreciation $ 1,002 $ 782 Intangible Assets Accumulated Amortization 151 93
Distributions Made to Limited Liability Company (LLC) Member, by Distribution [Table Text Block]	Distributions The following table lists the distributions paid on NRG Yield LLC's Class A, B, C and D units during the nine months ended September 30, 2016 : Third Quarter 2016 Second Quarter 2016 First Quarter 2016 Distributions per Class A, B, C and D unit $ 0.24 $ 0.23 $ 0.225 On November 2, 2016 , the Company declared a distribution on its Class A, Class B, Class C and Class D units of $0.25 per unit payable on December 15, 2016 to unit holders of record as of December 1, 2016 . 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, 2015 460 Capital contributions from tax equity investors, net of distributions 7 Distributions to NRG for NRG Wind TE Holdco (9 ) Comprehensive loss (62 ) Balance as of September 30, 2016 $ 396

Business Acquisitions Business

Business Acquisitions Business Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015
Business Acquisition [Line Items]
Schedule of Business Acquisitions, by Acquisition [Table Text Block]	The following is the summary of historical net liabilities assumed in connection with the CVSR Drop Down as of September 1, 2016: CVSR (In millions) Current assets $ 95 Property, plant and equipment 826 Non-current assets 13 Total assets 934 Debt (a) 966 Other current and non-current liabilities 12 Total liabilities 978 Net liabilities assumed (44 ) Accumulated Other Comprehensive Loss (25 ) Historical Net Liabilities Assumed $ (19 ) (a) Net of deferred financing costs of $5 million . Since the acquisition date, CVSR has contributed $9 million in operating revenues and $4 million in net income to the Company.	The following tables present the historical information summary combining the financial information for the CVSR Drop Down transferred in connection with the acquisition: December 31, 2015 As Previously Reported CVSR As Currently Reported Current assets $ 321 $ 98 $ 419 Property, plant and equipment 5,056 822 5,878 Non-current assets 2,231 (6 ) 2,225 Total assets 7,608 914 8,522 Debt 4,835 790 5,625 Other current and non-current liabilities 339 18 357 Total liabilities 5,174 808 5,982 Net assets $ 2,434 $ 106 $ 2,540 Three months ended September 30, 2015 As Previously Reported (a) CVSR As Currently Reported Total operating revenues $ 225 $ 31 $ 256 Operating income 81 21 102 Net income 36 8 44 (a) Previously reported in Note 15, Unaudited Quarterly Data, to the Company's consolidated financial statements included in the 2015 Form 10-K . Nine months ended September 30, 2015 As Previously Reported (a) CVSR As Currently Reported Total operating revenues $ 660 $ 69 $ 729 Operating income 212 39 251 Net income 57 11 68 (a) Previously reported in Note 15, Unaudited Quarterly Data, to the Company's consolidated financial statements included in the 2015 Form 10-K .

Variable Interest Entities (Tab

Variable Interest Entities (Tables)	9 Months Ended
	Sep. 30, 2016
Schedule of Equity Method Investments [Line Items]
Schedule of Variable Interest Entities [Table Text Block]	Summarized financial information for the Company's consolidated VIEs consisted of the following as of September 30, 2016 : (In millions) NRG Wind TE Holdco Alta Wind TE Holdco Spring Canyon Other current and non-current assets $ 189 $ 19 $ 4 Property, plant and equipment 635 466 101 Intangible assets 2 278 — Total assets 826 763 105 Current and non-current liabilities 225 9 6 Total liabilities 225 9 6 Noncontrolling interest 209 118 69 Net assets less noncontrolling interests $ 392 $ 636 $ 30
GCE Holding LLC [Member]
Schedule of Equity Method Investments [Line Items]
Summarized financial information of equity method investment	The following table presents summarized financial information for GCE Holding LLC: Three months ended September 30, Nine months ended September 30, (In millions) 2016 2015 2016 2015 Income Statement Data: Operating revenues $ 18 $ 21 $ 54 $ 61 Operating income 9 9 28 29 Net income $ 7 $ 6 $ 20 $ 20 September 30, 2016 December 31, 2015 Balance Sheet Data: (In millions) Current assets $ 29 $ 36 Non-current assets 403 416 Current liabilities 12 16 Non-current liabilities $ 208 $ 215

Fair Value of Financial Instr23

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives: Three months ended September 30, Nine months ended September 30, 2016 2015 (a) 2016 2015 (a) (In millions) Accumulated OCL beginning balance (a) $ (168 ) $ (83 ) $ (99 ) $ (82 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 6 6 13 13 Mark-to-market of cash flow hedge accounting contracts 14 (46 ) (62 ) (54 ) Accumulated OCL ending balance (148 ) (123 ) (148 ) (123 ) Accumulated OCL attributable to noncontrolling interests (4 ) (3 ) (4 ) (3 ) Accumulated OCL attributable to NRG Yield LLC $ (144 ) $ (120 ) $ (144 ) $ (120 ) Losses expected to be realized from OCL during the next 12 months $ 20 $ 20
Estimated carrying values and fair values of the Company's recorded financial instruments	The estimated carrying amounts and fair values of the Company’s recorded financial instruments not carried at fair market value are as follows: As of September 30, 2016 As of December 31, 2015 (a) Carrying Amount Fair Value Carrying Amount Fair Value (In millions) Assets: Notes receivable, including current portion $ 35 $ 35 $ 47 $ 47 Liabilities: Long-term debt — affiliate 618 614 618 553 Long-term debt — external, including current portion $ 5,100 $ 5,108 $ 5,060 $ 4,974 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business .
Fair Value, Option, Quantitative Disclosures [Table Text Block]	The fair value of the Company's publicly-traded long-term debt is based on quoted market prices and is classified as Level 2 within the fair value hierarchy. The fair value of debt securities, non-publicly traded long-term debt and certain notes receivable of the Company are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments with equivalent credit quality and are classified as Level 3 within the fair value hierarchy. The following table presents the level within the fair value hierarchy for long-term debt, including current portion as of September 30, 2016 and December 31, 2015: As of September 30, 2016 As of December 31, 2015 Level 2 Level 3 Level 2 Level 3 (In millions) Long-term debt, including current portion $ 850 $ 4,872 $ 413 $ 5,114
Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]	The Company records its derivative assets and liabilities at fair value on its consolidated balance sheet. There were no derivative asset positions on the Company's consolidated balance sheet as of December 31, 2015 . The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy: As of September 30, 2016 As of December 31, 2015 Fair Value (a) Fair Value (a) (In millions) Level 2 Level 2 Derivative assets: Commodity contracts $ 1 $ — Total assets 1 — Derivative liabilities: Commodity contracts 1 2 Interest rate contracts 138 98 Total liabilities $ 139 $ 100

Accounting for Derivative Ins24

Accounting for Derivative Instruments and Hedging Activities (Tables)	9 Months Ended
	Sep. 30, 2016
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/(sell) of the Company's open derivative transactions broken out by commodity: Total Volume September 30, 2016 December 31, 2015 (a) Commodity Units (In millions) Natural Gas MMBtu 3 4 Interest Dollars $ 1,875 $ 1,991
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 September 30, 2016 September 30, 2016 December 31, 2015 (a) (In millions) Derivatives Designated as Cash Flow Hedges: Interest rate contracts current $ — $ 29 $ 34 Interest rate contracts long-term — 94 56 Total Derivatives Designated as Cash Flow Hedges — 123 90 Derivatives Not Designated as Cash Flow Hedges : Interest rate contracts current — 2 3 Interest rate contracts long-term — 13 5 Commodity contracts current 1 1 2 Total Derivatives Not Designated as Cash Flow Hedges 1 16 10 Total Derivatives $ 1 $ 139 $ 100 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business .
Offsetting of derivatives by counterparty master agreement level and collateral received or paid	The Company has elected to present derivative assets and liabilities on the balance sheet on a trade-by-trade basis and does not offset amounts at the counterparty master agreement level. As of September 30, 2016 , and December 31, 2015 , there were no offsetting amounts at the counterparty master agreement level or outstanding collateral paid or received.
Effects of NRG Yield's accumulated OCI balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax	The following table summarizes the effects on the Company’s accumulated OCL balance attributable to interest rate swaps designated as cash flow hedge derivatives: Three months ended September 30, Nine months ended September 30, 2016 2015 (a) 2016 2015 (a) (In millions) Accumulated OCL beginning balance (a) $ (168 ) $ (83 ) $ (99 ) $ (82 ) Reclassified from accumulated OCL to income due to realization of previously deferred amounts 6 6 13 13 Mark-to-market of cash flow hedge accounting contracts 14 (46 ) (62 ) (54 ) Accumulated OCL ending balance (148 ) (123 ) (148 ) (123 ) Accumulated OCL attributable to noncontrolling interests (4 ) (3 ) (4 ) (3 ) Accumulated OCL attributable to NRG Yield LLC $ (144 ) $ (120 ) $ (144 ) $ (120 ) Losses expected to be realized from OCL during the next 12 months $ 20 $ 20

Long-term Debt (Tables)

Long-term Debt (Tables)	9 Months Ended
	Sep. 30, 2016
Debt Disclosure [Abstract]
Schedule of long-term debt	This footnote should be read in conjunction with the complete description under Note 9, Long-term Debt , to the Company's consolidated financial statements included in the 2015 Form 10-K. Long-term debt consisted of the following: September 30, 2016 December 31, 2015 (c) September 30, 2016, interest rate % (a) Letters of Credit Outstanding at September 30, 2016 (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 — 5.000 NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility, due 2019 (b) — 306 L+2.75 $ 64 Project-level debt: Alpine, due 2022 147 154 L+1.75 37 Alta Wind I, lease financing arrangement, due 2034 245 252 7.015 16 Alta Wind II, lease financing arrangement, due 2034 194 198 5.696 23 Alta Wind III, lease financing arrangement, due 2034 201 206 6.067 23 Alta Wind IV, lease financing arrangement, due 2034 130 133 5.938 16 Alta Wind V, lease financing arrangement, due 2035 208 213 6.071 26 Alta Realty Investments, due 2031 32 33 7.000 — Alta Wind Asset Management, due 2031 18 19 L+2.375 — Avra Valley, due 2031 57 60 L+1.75 3 Blythe, due 2028 20 21 L+1.625 6 Borrego, due 2025 and 2038 70 72 L+ 2.50/5.65 5 CVSR, due 2037 771 793 2.339 - 3.775 — CVSR Holdco, due 2037 199 — 4.68 13 El Segundo Energy Center, due 2023 443 485 L+1.625 - L+2.25 82 Energy Center Minneapolis, due 2017 and 2025 98 108 5.95 -7.25 — Kansas South, due 2031 31 33 L+2.00 4 Laredo Ridge, due 2028 101 104 L+1.875 10 Marsh Landing, due 2017 and 2023 385 418 L+1.75 - L+1.875 33 PFMG and related subsidiaries financing agreement, due 2030 28 29 6.000 — Roadrunner, due 2031 37 40 L+1.625 5 South Trent Wind, due 2020 58 62 L+1.625 10 TA High Desert, due 2020 and 2032 51 52 L+2.50/5.15 8 Tapestry, due 2021 175 181 L+1.625 20 Viento, due 2023 183 189 L+2.75 27 Walnut Creek, due 2023 322 351 L+1.625 49 WCEP Holdings, due 2023 46 46 L+3.00 — Other — 2 various — Subtotal project-level debt: 4,250 4,254 Total debt 5,718 5,678 Less current maturities 281 264 Less deferred financing costs 55 53 Total long-term debt $ 5,382 $ 5,361 (a) As of September 30, 2016 , L+ equals 3 month LIBOR plus x%, except for the Alpine term loan, Marsh Landing term loan, 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 and Viento, where L+ equals 6 month LIBOR plus x%. (b) Applicable rate is determined by the borrower leverage ratio, as defined in the credit agreement. (c) Retrospectively adjusted as discussed in Note 1, Nature of Business .

Segment Reporting (Tables)

Segment Reporting (Tables)	9 Months Ended
	Sep. 30, 2016
Segment Reporting [Abstract]
Schedule of Segment Reporting Information, by Segment	Three months ended September 30, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 82 $ 142 $ 48 $ — $ 272 Cost of operations 14 31 31 — 76 Depreciation and amortization 20 50 5 — 75 General and administrative — — — 3 3 Operating income (loss) 48 61 12 (3 ) 118 Equity in earnings of unconsolidated affiliates 3 10 — — 13 Other income, net 1 — — — 1 Interest expense (13 ) (37 ) (2 ) (16 ) (68 ) Net Income (Loss) $ 39 $ 34 $ 10 $ (19 ) $ 64 Total Assets $ 2,001 $ 5,783 $ 427 $ 90 $ 8,301 Three months ended September 30, 2015 (a) (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 86 $ 124 $ 46 $ — $ 256 Cost of operations 15 36 31 — 82 Depreciation and amortization 19 45 5 — 69 General and administrative — — — 2 2 Acquisition-related transaction and integration costs — — — 1 1 Operating income (loss) 52 43 10 (3 ) 102 Equity in earnings of unconsolidated affiliates 3 9 — — 12 Loss on debt extinguishment — (2 ) — — (2 ) Interest expense (11 ) (41 ) (1 ) (15 ) (68 ) Net Income (Loss) $ 44 $ 9 $ 9 $ (18 ) $ 44 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . Nine months ended September 30, 2016 (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 246 $ 412 $ 131 $ — $ 789 Cost of operations 53 98 87 — 238 Depreciation and amortization 60 149 15 — 224 General and administrative — — — 8 8 Operating income (loss) 133 165 29 (8 ) 319 Equity in earnings of unconsolidated affiliates 10 19 — — 29 Other income, net 1 2 — — 3 Interest expense (36 ) (115 ) (5 ) (48 ) (204 ) Net Income (Loss) $ 108 $ 71 $ 24 $ (56 ) $ 147 Nine months ended September 30, 2015 (a) (In millions) Conventional Generation Renewables Thermal Corporate Total Operating revenues $ 247 $ 347 $ 135 $ — $ 729 Cost of operations 51 99 96 — 246 Depreciation and amortization 61 147 14 — 222 General and administrative — — — 8 8 Acquisition-related transaction and integration costs — — — 2 2 Operating income (loss) 135 101 25 (10 ) 251 Equity in earnings of unconsolidated affiliates 10 9 — — 19 Other income, net 1 1 — — 2 Loss on debt extinguishment (7 ) (2 ) — — (9 ) Interest expense (36 ) (116 ) (5 ) (38 ) (195 ) Net Income (Loss) $ 103 $ (7 ) $ 20 $ (48 ) $ 68 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business .

Condensed Consolidating Finan27

Condensed Consolidating Financial Information Condensed Consolidating Financial Information (Tables)	9 Months Ended
	Sep. 30, 2016
Condensed Consolidating Financial Information Disclosure [Abstract]
Condensed Cash Flow Statement [Table Text Block]	NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Nine Months Ended September 30, 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 $ — $ 45 $ 361 $ 34 $ 440 Cash Flows from Investing Activities Intercompany transactions between Yield LLC and subsidiaries 145 — — (145 ) — Acquisition of Drop Down Assets, net of cash acquired — — — (77 ) (77 ) Capital expenditures — — (16 ) — (16 ) Increase in restricted cash — — (7 ) — (7 ) Decrease in notes receivable — — 11 — 11 Return of investment from unconsolidated affiliates — 3 — 13 16 Net investments in unconsolidated affiliates — (48 ) — (21 ) (69 ) Net Cash Provided by (Used in) Investing Activities 145 (45 ) (12 ) (230 ) (142 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement 54 — — (54 ) — Net contributions from noncontrolling interests — — — 7 7 Distributions to NRG for CVSR and NRG Wind TE Holdco — — (122 ) — (122 ) Payment of distributions (127 ) — (204 ) 204 (127 ) Payment of debt issuance costs — — (1 ) (5 ) (6 ) Net payments for the revolving credit facility — — — (306 ) (306 ) Proceeds from the issuance of long-term debt — external — — 200 350 550 Payments for long-term debt — — (204 ) — (204 ) Net Cash (Used in) Provided by Financing Activities (73 ) — (331 ) 196 (208 ) Net Decrease in Cash and Cash Equivalents 72 — 18 — 90 Cash and Cash Equivalents at Beginning of Period 15 — 95 — 110 Cash and Cash Equivalents at End of Period $ 87 $ — $ 113 $ — $ 200 NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF CASH FLOWS For the Nine Months Ended September 30, 2015 (Unaudited) NRG Yield LLC Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) Consolidated (In millions) Net Cash (Used in) Provided by Operating Activities $ — $ 28 $ 224 $ 58 $ 310 Cash Flows from Investing Activities Intercompany transactions from Yield LLC to subsidiaries (501 ) — — 501 — Acquisition of businesses, net of cash acquired — — — (37 ) (37 ) Acquisition of Drop Down Assets, net of cash acquired — — — (489 ) (489 ) Capital expenditures — — (17 ) — (17 ) Increase in restricted cash — — (24 ) — (24 ) Decrease in notes receivable — — 13 — 13 Proceeds from renewable energy grants — — 22 — 22 Return of investment from unconsolidated affiliates — — — 16 16 Investments in unconsolidated affiliates — (19 ) — (332 ) (351 ) Net Cash Used in Investing Activities (501 ) (19 ) (6 ) (341 ) (867 ) Cash Flows from Financing Activities Transfer of funds under intercompany cash management arrangement (277 ) (9 ) — 286 — Net contributions from noncontrolling interests — — 4 119 123 Distributions to NRG for NRG Wind TE Holdco and CVSR — — (52 ) — (52 ) Proceeds from the issuance of Class C and Class A units 599 — — — 599 Payment of distributions (99 ) — — — (99 ) Proceeds from issuance of long-term debt affiliate — — — 281 281 Payment of debt issuance costs — — (6 ) (1 ) (7 ) Net borrowings from the revolving credit facility — — — 92 92 Proceeds from the issuance of long-term debt - external — — 5 — 5 Payments for long-term debt — — (175 ) (494 ) (669 ) Net Cash Provided by (Used in) Financing Activities 223 (9 ) (224 ) 283 273 Net Decrease in Cash and Cash Equivalents (278 ) — (6 ) — (284 ) Cash and Cash Equivalents at Beginning of Period 328 — 101 — 429 Cash and Cash Equivalents at End of Period $ 50 $ — $ 95 $ — $ 145 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business .
Condensed Balance Sheet [Table Text Block]	NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS September 30, 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 $ 87 $ — $ 113 $ — $ — $ 200 Restricted cash — — 138 — — 138 Accounts receivable — trade — 3 112 — — 115 Accounts receivable — affiliate 2 — 1 — — 3 Inventory — 2 35 — — 37 Derivative instruments — — 1 — — 1 Notes receivable — — 17 — — 17 Prepayments and other current assets — — 20 1 — 21 Total current assets 89 5 437 1 — 532 Net property, plant and equipment — 58 5,653 — — 5,711 Other Assets Investment in consolidated subsidiaries 1,779 540 — 3,132 (5,451 ) — Equity investments in affiliates — 76 160 454 — 690 Notes receivable — — 18 — — 18 Intangible assets, net — 56 1,247 — — 1,303 Other non-current assets — — 45 2 — 47 Total other assets 1,779 672 1,470 3,588 (5,451 ) 2,058 Total Assets $ 1,868 $ 735 $ 7,560 $ 3,589 $ (5,451 ) $ 8,301 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS (Continued) September 30, 2016 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 $ — $ — $ 281 $ — $ — $ 281 Accounts payable — 2 18 3 — 23 Accounts payable — affiliate — 4 18 7 — 29 Derivative instruments — — 32 — — 32 Accrued expenses and other current liabilities — 1 81 12 — 94 Total current liabilities — 7 430 22 — 459 Other Liabilities Long-term debt — external — — 3,925 839 — 4,764 Long-term debt — affiliate — — — 618 — 618 Accounts payable — affiliate — — 11 — — 11 Derivative instruments — — 107 — — 107 Other non-current liabilities — — 78 — — 78 Total non-current liabilities — — 4,121 1,457 — 5,578 Total Liabilities — 7 4,551 1,479 — 6,037 Commitments and Contingencies Members' Equity Contributed capital 1,848 784 2,929 1,832 (5,545 ) 1,848 Retained earnings (accumulated deficit) 164 (53 ) 156 91 (194 ) 164 Accumulated other comprehensive loss (144 ) (3 ) (141 ) (144 ) 288 (144 ) Noncontrolling interest — — 65 331 — 396 Total Members' Equity 1,868 728 3,009 2,110 (5,451 ) 2,264 Total Liabilities and Members’ Equity $ 1,868 $ 735 $ 7,560 $ 3,589 $ (5,451 ) $ 8,301 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS December 31, 2015 NRG Yield LLC (b) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (b) NRG Yield Operating LLC (b) Eliminations (a)(b) Consolidated ASSETS (In millions) Current Assets Cash and cash equivalents $ 15 $ — $ 95 $ — $ — $ 110 Restricted cash — — 131 — — 131 Accounts receivable — trade — 1 100 — — 101 Accounts receivable — affiliate 55 4 6 10 (71 ) 4 Inventory — 2 34 — — 36 Notes receivable — — 17 3 (3 ) 17 Prepayments and other current assets — 1 19 — — 20 Total current assets 70 8 402 13 (74 ) 419 Net property, plant and equipment — 61 5,817 — — 5,878 Other Assets Investment in consolidated subsidiaries 2,010 548 — 3,477 (6,035 ) — Equity investments in affiliates — 70 176 451 — 697 Notes receivable — — 30 — — 30 Intangible assets, net — 57 1,305 — — 1,362 Other non-current assets — — 134 2 — 136 Total other assets 2,010 675 1,645 3,930 (6,035 ) 2,225 Total Assets $ 2,080 $ 744 $ 7,864 $ 3,943 $ (6,109 ) $ 8,522 (a) All significant intercompany transactions have been eliminated in consolidation. (b) Retrospectively adjusted as discussed in Note 1, Nature of Business . NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING BALANCE SHEETS (Continued) December 31, 2015 NRG Yield LLC (b) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (b) NRG Yield Operating LLC (b) Eliminations (a)(b) Consolidated LIABILITIES AND MEMBERS' EQUITY (In millions) Current Liabilities Current portion of long-term debt — external $ — $ — $ 267 $ — $ (3 ) $ 264 Accounts payable — 1 19 3 — 23 Accounts payable — affiliate — 8 46 104 (72 ) 86 Derivative instruments — 1 38 — — 39 Accrued expenses and other current liabilities — 1 58 17 — 76 Total current liabilities — 11 428 124 (75 ) 488 Other Liabilities Long-term debt — external — — 3,943 800 — 4,743 Long-term debt — affiliate — — — 618 — 618 Derivative instruments — — 61 — — 61 Other non-current liabilities — — 72 — — 72 Total non-current liabilities — — 4,076 1,418 — 5,494 Total Liabilities — 11 4,504 1,542 (75 ) 5,982 Commitments and Contingencies Members' Equity Contributed capital 2,082 821 3,397 2,014 (6,232 ) 2,082 Retained earnings (Accumulated deficit) 93 (85 ) (12 ) 93 4 93 Accumulated other comprehensive loss (95 ) (3 ) (96 ) (95 ) 194 (95 ) Noncontrolling Interest — — 71 389 — 460 Total Members' Equity 2,080 733 3,360 2,401 (6,034 ) 2,540 Total Liabilities and Members’ Equity $ 2,080 $ 744 $ 7,864 $ 3,943 $ (6,109 ) $ 8,522 (a) All significant intercompany transactions have been eliminated in consolidation. (b) Retrospectively adjusted as discussed in Note 1, Nature of Business .
Condensed Statement of Comprehensive Income [Table Text Block]	CONDENSED CONSOLIDATING STATEMENTS OF COMPREHENSIVE INCOME For the Three Months Ended September 30, 2016 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income $ 100 $ 5 $ 69 $ 64 $ (174 ) $ 64 Other Comprehensive Income Unrealized gain on derivatives 11 — 18 20 (29 ) 20 Other comprehensive income 11 — 18 20 (29 ) 20 Comprehensive Income 111 5 87 84 (203 ) 84 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (26 ) — (27 ) Comprehensive Income Attributable to NRG Yield LLC $ 111 $ 5 $ 88 $ 110 $ (203 ) $ 111 (a) All significant intercompany transactions have been eliminated in consolidation. For the Nine Months Ended September 30, 2016 (Unaudited) NRG Yield LLC Guarantor Subsidiaries Non-Guarantor Subsidiaries NRG Yield Operating LLC (Note Issuer) Eliminations (a) Consolidated (In millions) Net Income $ 209 $ 30 $ 169 $ 147 $ (408 ) $ 147 Other Comprehensive Loss Unrealized loss on derivatives (49 ) — (45 ) (49 ) 94 (49 ) Other comprehensive loss (49 ) — (45 ) (49 ) 94 (49 ) Comprehensive Income 160 30 124 98 (314 ) 98 Less: Comprehensive loss attributable to noncontrolling interests — — (1 ) (61 ) — (62 ) Comprehensive Income Attributable to NRG Yield LLC $ 160 $ 30 $ 125 $ 159 $ (314 ) $ 160 (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 September 30, 2015 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (a)(b) Consolidated (In millions) Net Income (Loss) $ 62 $ (7 ) $ 46 $ 44 $ (101 ) $ 44 Other Comprehensive Loss Unrealized loss on derivatives (39 ) — (37 ) (40 ) 76 (40 ) Other comprehensive loss (39 ) — (37 ) (40 ) 76 (40 ) Comprehensive Income (Loss) 23 (7 ) 9 4 (25 ) 4 Less: Comprehensive loss attributable to noncontrolling interests — — 2 (21 ) — (19 ) Comprehensive Income (Loss)Attributable to NRG Yield LLC $ 23 $ (7 ) $ 7 $ 25 $ (25 ) $ 23 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. For the Nine Months Ended September 30, 2015 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (a) (b) Consolidated (In millions) Net Income (Loss) $ 102 $ (25 ) $ 85 $ 68 $ (162 ) $ 68 Other Comprehensive Loss Unrealized loss on derivatives (40 ) — (37 ) (41 ) 77 (41 ) Other comprehensive loss (40 ) — (37 ) (41 ) 77 (41 ) Comprehensive Income (Loss) 62 (25 ) 48 27 (85 ) 27 Less: Comprehensive loss attributable to noncontrolling interests — — (2 ) (33 ) — (35 ) Comprehensive Income (Loss) attributable to NRG Yield LLC $ 62 $ (25 ) $ 50 $ 60 $ (85 ) $ 62 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation.
Condensed Income Statement [Table Text Block]	NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Three Months Ended September 30, 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 $ — $ 7 $ 265 $ — $ — $ 272 Operating Costs and Expenses Cost of operations — 3 73 — — 76 Depreciation and amortization — 2 73 — — 75 General and administrative — — — 3 — 3 Total operating costs and expenses — 5 146 3 — 154 Operating Income (Loss) — 2 119 (3 ) — 118 Other Income (Expense) Equity in earnings of consolidated affiliates 100 4 — 70 (174 ) — Equity in earnings of unconsolidated affiliates — (1 ) — 14 — 13 Other income, net — — 1 — — 1 Interest expense — — (51 ) (17 ) — (68 ) Total other income (expense), net 100 3 (50 ) 67 (174 ) (54 ) Net Income 100 5 69 64 (174 ) 64 Less: Net loss attributable to noncontrolling interests — — (1 ) (36 ) 1 (36 ) Net Income Attributable to $ 100 $ 5 $ 70 $ 100 $ (175 ) $ 100 (a) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF INCOME For the Nine Months Ended September 30, 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 $ — $ 17 $ 772 $ — $ 789 Operating Costs and Expenses Cost of operations — 10 228 — — 238 Depreciation and amortization — 4 220 — — 224 General and administrative — — — 8 — 8 Total operating costs and expenses — 14 448 8 — 470 Operating Income (Loss) — 3 324 (8 ) — 319 Other Income (Expense) Equity in earnings of consolidated affiliates 209 21 — 178 (408 ) — Equity in earnings (losses) of unconsolidated affiliates — 6 (2 ) 25 — 29 Other income, net — — 3 — — 3 Interest expense — — (156 ) (48 ) — (204 ) Total other income (expense), net 209 27 (155 ) 155 (408 ) (172 ) Net Income 209 30 169 147 (408 ) 147 Less: Net loss attributable to noncontrolling interests — — (1 ) (62 ) 1 (62 ) Net Income Attributable to $ 209 $ 30 $ 170 $ 209 $ (409 ) $ 209 (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 September 30, 2015 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (a) (b) Consolidated (In millions) Operating Revenues Total operating revenues $ — $ 7 $ 248 $ 1 $ — $ 256 Operating Costs and Expenses Cost of operations — 4 78 — — 82 Depreciation and amortization — 1 68 — — 69 General and administrative — — — 2 — 2 Acquisition-related transaction and integration costs — — — 1 — 1 Total operating costs and expenses — 5 146 3 — 154 Operating Income (Loss) — 2 102 (2 ) — 102 Other (Expense) Income Equity in earnings (losses) of consolidated affiliates 62 (9 ) — 48 (101 ) — Equity in earnings of unconsolidated affiliates — — — 12 — 12 Loss on debt extinguishment — — (2 ) — — (2 ) Interest expense — — (54 ) (14 ) — (68 ) Total other income (expense), net 62 (9 ) (56 ) 46 (101 ) (58 ) Net Income (Loss) 62 (7 ) 46 44 (101 ) 44 Less: Net income (loss) attributable to noncontrolling interests — — 2 (18 ) (2 ) (18 ) Net Income (Loss) Attributable to NRG Yield LLC $ 62 $ (7 ) $ 44 $ 62 $ (99 ) $ 62 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation. NRG YIELD LLC AND SUBSIDIARIES CONDENSED CONSOLIDATING STATEMENTS OF OPERATIONS For the Nine Months Ended September 30, 2015 (Unaudited) NRG Yield LLC (a) Other Guarantor Subsidiaries Non-Guarantor Subsidiaries (a) NRG Yield Operating LLC (Note Issuer) (a) Eliminations (a) (b) Consolidated (In millions) Operating Revenues Total operating revenues $ — $ 17 $ 703 $ 9 $ — $ 729 Operating Costs and Expenses Cost of operations — 11 235 — — 246 Depreciation and amortization — 3 219 — — 222 General and administrative — — — 8 — 8 Acquisition-related transaction and integration costs — — — 2 — 2 Total operating costs and expenses — 14 454 10 — 478 Operating Income — 3 249 (1 ) — 251 Other (Expense) Income Equity in income (losses) of consolidated affiliates 102 (28 ) — 88 (162 ) — Equity in earnings of unconsolidated affiliates — — — 19 — 19 Other income, net — — 2 — — 2 Loss on debt extinguishment — — (9 ) — — (9 ) Interest expense — — (157 ) (38 ) — (195 ) Total other expense, net 102 (28 ) (164 ) 69 (162 ) (183 ) Net Income (Loss) 102 (25 ) 85 68 (162 ) 68 Less: Net loss attributable to noncontrolling interests — — (2 ) (34 ) 2 (34 ) Net Income (Loss) Attributable to NRG Yield LLC $ 102 $ (25 ) $ 87 $ 102 $ (164 ) $ 102 (a) Retrospectively adjusted as discussed in Note 1, Nature of Business . (b) All significant intercompany transactions have been eliminated in consolidation.

Nature of Business (Details)

Nature of Business (Details) $ in Millions

Sep. 02, 2016USD ($)

Feb. 19, 2016USD ($)

Nov. 03, 2015USD ($)

Jun. 30, 2015

Jun. 29, 2015USD ($)shares

Jan. 02, 2015USD ($)

Sep. 30, 2016USD ($)MW

Sep. 30, 2015USD ($)

Sep. 01, 2016USD ($)

Aug. 31, 2016

Nov. 02, 2015MW

Nature of Business

Megawatts Thermal Equivalent, Available Under right-to-use Provisions

134

Equity Method Investment, Ownership Percentage

48.95%

Power Generation Capacity, Megawatts

[1],[2]

4,686

Acquisition of businesses, net of cash acquired | $

$ (37)

Proceeds from the issuance of Class C and Class A units | $

$ 0

599

[3]

Distributed Solar

Nature of Business

Power Generation Capacity, Megawatts

[2]

9

Wind Farms [Member]

Nature of Business

Power Generation Capacity, Megawatts

[2]

1,999

Thermal [Member]

Nature of Business

Percentage of Ownership

[4]

100.00%

Steam and Chilled Water Capacity, Megawatts Thermal Equivalent

[2],[4]

1,315

Power Generation Capacity, Megawatts

1,438

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]

610

Thermal [Member] | Thermal [Member]

Nature of Business

Power Generation Capacity, Megawatts

[2]

20

NRG RPV Holdco [Member]

Nature of Business

Power Generation Capacity, Megawatts

43

NRG DGPV Holdco [Member]

Nature of Business

Power Generation Capacity, Megawatts

52

NRG Yield [Member] | NRG Yield [Member]

Nature of Business

Sale of Stock, Number of Shares Issued in Transaction | shares

28,198,000

NRG Yield LLC

Nature of Business

Acquisition of businesses, net of cash acquired | $

0

Proceeds from the issuance of Class C and Class A units | $

$ 599

NRG Yield LLC | NRG

Nature of Business

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Voting Interest

55.10%

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest

46.70%

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%

44.90%

Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest

53.30%

53.30%

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

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

Roadrunner | Utility-Scale Solar

Nature of Business

Percentage of Ownership

100.00%

Power Generation Capacity, Megawatts

[2]

20

CVSR [Member] | Utility-Scale Solar

Nature of Business

Equity Method Investment, Ownership Percentage

100.00%

Power Generation Capacity, Megawatts

[2]

250

TA - High Desert LLC [Member] | Utility-Scale Solar

Nature of Business

Percentage of Ownership

100.00%

Power Generation Capacity, Megawatts

[2]

20

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

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

51.00%

Power Generation Capacity, Megawatts

[2]

4

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

NRG Energy Center Dover [Member] | Thermal [Member]

Nature of Business

Power Generation Capacity, Megawatts

[2]

103

November 2015 Drop Down Assets [Member]

Nature of Business

Business Acquisition, Percentage of Voting Interests Acquired

75.00%

Payments to Acquire Businesses, Gross | $

$ 207

$ 209

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $

$ 193

Business Acquisition, Consideration Transferred, Working Capital | $

$ 2

November 2015 Drop Down Assets [Member] | Wind Farms [Member]

Nature of Business

Power Generation Capacity, Megawatts

814

January 2015 Drop Down Assets [Member]

Nature of Business

Acquisition of businesses, net of cash acquired | $

$ (489)

Business Combination, Consideration Transferred, Liabilities Incurred | $

737

Business Acquisition, Consideration Transferred, Working Capital | $

$ 9

CVSR [Member]

Nature of Business

Business Acquisition, Percentage of Voting Interests Acquired

51.05%

Payments to Acquire Businesses, Gross | $

$ 78.5

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt | $

$ 496

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%

Common Class C [Member]

Nature of Business

Proceeds from the issuance of Class C and Class A units | $

$ 599

[1]

(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,

[2]

a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.

[3]

(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

[4]

(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.

[5]

(b) Projects are part of tax equity arrangements.

Summary of Significant Accoun29

Summary of Significant Accounting Policies (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended					9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Sep. 30, 2015	[2]	Sep. 30, 2016	Sep. 30, 2015		Dec. 31, 2015
Summary of Significant Accounting Policies [Line Items]
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment	$ 1,002					$ 1,002			$ 782
Noncontrolling interest	396					396			460
Capital contributions from tax equity investors, net of distributions						7	$ 123	[1]
Distributions to NRG for NRG Wind TE Holdco						(122)	(52)	[1]
Comprehensive loss	$ (27)			$ (19)		$ (62)	$ (35)	[2]
Dividends Payable, Date Declared						Nov. 2, 2016
Common Stock, Dividends, Per Share, Declared						$ 0.25
Dividends Payable, Date to be Paid						Dec. 15, 2016
Dividends Payable, Date of Record						Dec. 1, 2016
Dividends Per Class A Common Share	$ 0.24	$ 0.23
Intangible assets, accumulated amortization	$ 151					$ 151			$ 93
Financial Institutions [Member]
Summary of Significant Accounting Policies [Line Items]
Capital contributions from tax equity investors, net of distributions						7
November 2015 Drop Down Assets [Member]
Summary of Significant Accounting Policies [Line Items]
Distributions to NRG for NRG Wind TE Holdco						$ (9)
Common Class A [Member]
Summary of Significant Accounting Policies [Line Items]
Dividends Per Class A Common Share			$ 0.225
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Business Acquisitions Busines30

Business Acquisitions Business Acquisitions - CVSR (Details) - USD ($) $ in Millions	Sep. 02, 2016	Sep. 30, 2016	Sep. 30, 2016	Sep. 30, 2015		Sep. 30, 2016	Sep. 30, 2015		Sep. 01, 2016		Aug. 31, 2016	Dec. 31, 2015
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage											48.95%
Total operating revenues			$ 272	$ 256	[1],[2]	$ 789	$ 729	[1],[2]
Total current assets		$ 532	532			532						$ 419	[3]
Debt Issuance Costs, Net		55	55			55						53	[4]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(144)	(144)			(144)						(95)	[3]
Net property, plant and equipment		5,711	5,711			5,711						5,878	[3]
Total other assets		(2,058)	(2,058)			(2,058)						(2,225)	[3]
Total Assets		8,301	8,301			8,301						8,522	[3]
Long-term Debt and Capital Lease Obligations, Including Current Maturities												5,625
Other Liabilities												357
Liabilities		6,037	6,037			6,037						5,982	[3]
Total Members' Equity		2,264	2,264			2,264						2,540	[3]
Operating income (loss)			118	102	[1],[2]	319	251	[1],[2]
Net Income (Loss)			$ 64	44	[1],[2]	$ 147	68	[1],[2],[5]
CVSR [Member]
Business Acquisition [Line Items]
Total operating revenues				31			69
Total current assets									$ 95			98
Business Acquisition, Percentage of Voting Interests Acquired									51.05%
Payments to Acquire Businesses, Gross	$ 78.5
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt									$ 496
Business Combination, Indemnification Assets, Amount as of Acquisition Date									67
Debt Issuance Costs, Net									5
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		9
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ 4
Assets, Noncurrent									13
Net Assets									(44)
Accumulated Other Comprehensive Income (Loss), Net of Tax									(25)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net excluding AOCI									(19)
Net property, plant and equipment									826			822
Total other assets												(6)
Total Assets									934			914
Long-term Debt and Capital Lease Obligations, Including Current Maturities									966	[6]		790
Other Liabilities									12			18
Liabilities									$ 978			808
Total Members' Equity												106
Operating income (loss)				21			39
Net Income (Loss)				8			11
Scenario, Previously Reported [Member]
Business Acquisition [Line Items]
Total operating revenues				225	[7]		660	[8]
Total current assets												321
Net property, plant and equipment												5,056
Total other assets												(2,231)
Total Assets												7,608
Long-term Debt and Capital Lease Obligations, Including Current Maturities												4,835
Other Liabilities												339
Liabilities												5,174
Total Members' Equity												$ 2,434
Operating income (loss)				81	[7]		212	[8]
Net Income (Loss)				$ 36	[7]		$ 57	[8]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(c) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) Net of deferred financing costs of $5 million.
[7]	(a) Previously reported in Note 15, Unaudited Quarterly Data, to the Company's consolidated financial statements included in the 2015 Form 10-K.
[8]	(a) Previously reported in Note 15, Unaudited Quarterly Data, to the Company's consolidated financial statements included in the 2015 Form 10-K.

Business Acquisitions Busines31

Business Acquisitions Business Acquisitions - November 2015 Drop Down (Details)		Feb. 19, 2016USD ($)	Nov. 03, 2015USD ($)	Sep. 30, 2016MW	Nov. 02, 2015USD ($)MW
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[1],[2]			4,686
November 2015 Drop Down Assets [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					75.00%
Payments to Acquire Businesses, Gross		$ 207,000,000	$ 209,000,000
Business Acquisition, Consideration Transferred, Working Capital		$ 2,000,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 193,000,000
Number of Facilities					12
Financial Institutions [Member] | November 2015 Drop Down Assets [Member]
Business Acquisition [Line Items]
Taxable Income Allocation, Pre-Flip			99.00%
Taxable Income Allocation, Post-Flip			8.53%
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 159,000,000
Pre-Flip Point [Member] | November 2015 Drop Down Assets [Member]
Business Acquisition [Line Items]
Percentage of Cash Available for Distributions			75.00%
Post-Flip Point [Member] | November 2015 Drop Down Assets [Member]
Business Acquisition [Line Items]
Percentage of Cash Available for Distributions			68.60%
Pre-determined Date Through Flip Point If Flip Has Not Occured [Member] | Financial Institutions [Member] | November 2015 Drop Down Assets [Member]
Business Acquisition [Line Items]
Percentage of Cash Available for Distributions			100.00%
Wind Farms [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[2]			1,999
Wind Farms [Member] | November 2015 Drop Down Assets [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW					814
[1]	(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,
[2]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.

Business Acquisitions Busines32

Business Acquisitions Business Acquisitions - Desert Sunlight/Spring Canyon/Fuel Cell (Details)		Jun. 30, 2015USD ($)	May 08, 2015	Apr. 30, 2015	Sep. 30, 2016MW	Aug. 31, 2016	Jun. 29, 2015USD ($)	May 07, 2015
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage						48.95%
Power Generation Capacity, Megawatts	[1],[2]				4,686
Utility-Scale Solar [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts	[2]				610
Wind Farms [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts	[2]				1,999
Wind Farms [Member] | Spring Canyon [Member]
Business Acquisition [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired								90.10%
Wind Farms [Member] | Spring Canyon II [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts					32
Wind Farms [Member] | Spring Canyon III [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts					28
Thermal [Member]
Business Acquisition [Line Items]
Percentage of Ownership	[3]				100.00%
Power Generation Capacity, Megawatts					1,438
Desert Sunlight [Member]
Business Acquisition [Line Items]
Number of Facilities | $							2
Payments to Acquire Equity Method Investments | $		$ 285,000,000
Power Generation Capacity, Megawatts					550
Desert Sunlight [Member] | Utility-Scale Solar [Member]
Business Acquisition [Line Items]
Equity Method Investment, Ownership Percentage					25.00%
UB Fuel Cell [Member] | Thermal [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts					1.4
Supply Commitment [Member] | Spring Canyon [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life			24 years
Supply Commitment [Member] | UB Fuel Cell [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life				12 years
Southern California Edison [Member] | Supply Commitment [Member] | Desert Sunlight [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		20 years
Pacific Gas and Electric [Member] | Supply Commitment [Member] | Desert Sunlight [Member]
Business Acquisition [Line Items]
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		25 years
[1]	(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,
[2]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.
[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.

Business Acquisitions Busines33

Business Acquisitions Business Acquisitions - January 2015 Drop Downs (Details) $ in Millions		Jan. 02, 2015USD ($)	Sep. 30, 2015USD ($)	Sep. 30, 2016USD ($)MW	Dec. 31, 2015USD ($)
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[1],[2]			4,686
Acquisition of businesses, net of cash acquired			$ (37)
Total current assets				$ 532	$ 419	[3]
Net property, plant and equipment				5,711	5,878	[3]
Total Assets				8,301	8,522	[3]
Long-term Debt				5,718	5,678	[4]
Total Liabilities				$ 6,037	$ 5,982	[3]
January 2015 Drop Down Assets [Member]
Business Acquisition [Line Items]
Acquisition of businesses, net of cash acquired		$ (489)
Business Acquisition, Consideration Transferred, Working Capital		9
Business Combination, Consideration Transferred, Liabilities Incurred		737
Business Combination, Separately Recognized Transactions, Net Gains and Losses		61
AOCI Including Portion Attributable to Noncontrolling Interest, before Tax		$ 23
Conventional Generation [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[2]			1,945
Conventional Generation [Member] | Walnut Creek [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[2]			485
Wind Farms [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[2]			1,999
Wind Farms [Member] | Pinnacle [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[2]			55
Wind Farms [Member] | Buffalo Bear [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[2]			19
Wind Farms [Member] | Taloga [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[2]			130
Wind Farms [Member] | Laredo Ridge [Member]
Business Acquisition [Line Items]
Power Generation Capacity, Megawatts | MW	[2]			80
[1]	(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,
[2]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(c) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Vari

Variable Interest Entities Variable Interest Entities - Alta TE Holdco (Details) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	[2]	Dec. 31, 2015	[1]
Schedule of Equity Method Investments [Line Items]
Total other assets	$ 2,058			$ 2,225
Net contributions from noncontrolling interests	7	$ 123
Net property, plant and equipment	5,711			5,878
Total Assets	8,301			8,522
Total Liabilities	6,037			$ 5,982
Financial Institutions [Member]
Schedule of Equity Method Investments [Line Items]
Net contributions from noncontrolling interests	7
Alta X and XI TE Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	19
Net property, plant and equipment	466
Intangible Assets, Net (Excluding Goodwill)	278
Total Assets	763
Total Liabilities	9
Noncontrolling Interest in Variable Interest Entity	118
Net Assets	$ 636
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Va35

Variable Interest Entities Variable Interest Entities - DGPV (Details) $ in Millions		Feb. 29, 2016MW	May 08, 2015generatingunitMW	Sep. 30, 2016USD ($)MW	Sep. 30, 2015USD ($)		Dec. 31, 2015USD ($)	[4]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW	[1],[2]			4,686
Payments to Acquire Businesses and Interest in Affiliates				$ 69	$ 351	[3]
Business Combination, Consideration Transferred					$ 37
Equity investments in affiliates				690			$ 697
NRG DGPV Fund 2 [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW		7
NRG DGPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates				77
NRG DGPV Fund 1 [Member]
Schedule of Equity Method Investments [Line Items]
Remaining Lease Term		18 years
Tax Equity Financed Portfolio of Leases - Community Solar [Member] | NRG DGPV Fund 1 [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW			8
Remaining Lease Term			20 years
Number of Solar Leases in Portfolio | generatingunit			10
Tax Equity Financed Portfolio of Leases - Commercial PV [Member] | NRG DGPV Fund 1 [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW			37
Remaining Lease Term			19 years
Number of Solar Leases in Portfolio | generatingunit			12
Maximum [Member] | Tax Equity Financed Portfolio of Leases [Member] | NRG DGPV Fund 2 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates				50
Maximum [Member] | Tax Equity Financed Portfolio of Leases [Member] | NRG DGPV Fund 1 [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates				$ 100
[1]	(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,
[2]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.
[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 Va36

Variable Interest Entities Variable Interest Entities - RPV (Details) $ in Millions		9 Months Ended
		Sep. 30, 2016USD ($)generatingunitMW	Aug. 05, 2016USD ($)	Dec. 31, 2015USD ($)	[3]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW	[1],[2]	4,686
Equity investments in affiliates		$ 690		$ 697
NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		$ 70
Existing Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Number of Solar Leases in Portfolio | generatingunit		2,000
Power Generation Capacity, Megawatts | MW		15
Remaining Lease Term		17 years
Tax Equity Financed Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Number of Solar Leases in Portfolio | generatingunit		5,400
Power Generation Capacity, Megawatts | MW		28
Capital Contributions From Partners in Equity Method Investment		$ 57
Minimum [Member] | Tax Equity Financed Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Remaining Lease Term		17 years
Maximum [Member] | Tax Equity Financed Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Remaining Lease Term		20 years
Equity investments in affiliates		$ 150
Capital Contributions From Partners in Equity Method Investment		$ 60	$ 100
NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW		43
[1]	(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,
[2]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Va37

Variable Interest Entities Variable Interest Entities - GenConn (Details) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2016USD ($)facilityMW	Sep. 30, 2015USD ($)		Sep. 30, 2016USD ($)facilityMW	Sep. 30, 2015USD ($)		Aug. 31, 2016	Dec. 31, 2015USD ($)
Schedule of Equity Method Investments [Line Items]
Net contributions from noncontrolling interests					$ 7	$ 123	[1]
Equity Method Investment, Ownership Percentage								48.95%
Power Generation Capacity, Megawatts | MW	[2],[3]	4,686			4,686
Equity investments in affiliates		$ 690			$ 690				$ 697	[4]
Long-term Debt		5,718			5,718				5,678	[5]
Total operating revenues		272	$ 256	[6],[7]	789	729	[6],[7]
Operating income (loss)		118	102	[6],[7]	319	251	[6],[7]
Net Income (Loss)		64	44	[6],[7]	147	68	[1],[6],[7]
Total current assets		532			532				419	[4]
Current Liabilities		459			459				488	[4]
Total non-current liabilities		5,578			5,578				5,494	[4]
NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		$ 70			$ 70
GCE Holding LLC [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage		50.00%			50.00%
Equity investments in affiliates		$ 106			$ 106
Total operating revenues		18	21		54	61
Operating income (loss)		9	9		28	29
Net Income (Loss)		7	$ 6		20	$ 20
Total current assets		29			29				36
Assets, Noncurrent		403			403				416
Current Liabilities		12			12				16
Total non-current liabilities		$ 208			$ 208				$ 215
Gen Conn Energy LLC [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Units, Number | facility		2			2
Power Generation Capacity, Megawatts | MW		190			190
Tax Equity Financed Portfolio of Leases [Member] | NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW		28			28
Tax Equity Financed Portfolio of Leases [Member] | Maximum [Member] | NRG RPV Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Equity investments in affiliates		$ 150			$ 150
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,
[3]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(c) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[7]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Va38

Variable Interest Entities Variable Interest Entities (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015	[1]
Schedule of Equity Method Investments [Line Items]
Total other assets	$ 2,058	$ 2,225
Net property, plant and equipment	5,711	5,878
Total Assets	8,301	8,522
Liabilities	6,037	$ 5,982
Alta X and XI TE Holdco [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	19
Net property, plant and equipment	466
Intangible Assets, Net (Excluding Goodwill)	278
Total Assets	763
Liabilities	9
Noncontrolling Interest in Variable Interest Entity	118
Net Assets	636
November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets	189
Net property, plant and equipment	635
Intangible Assets, Net (Excluding Goodwill)	2
Total Assets	826
Liabilities	225
Noncontrolling Interest in Variable Interest Entity	209
Net Assets	$ 392
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Variable Interest Entities Spri

Variable Interest Entities Spring Canyon (Details) $ in Millions		Sep. 30, 2016USD ($)MW	Dec. 31, 2015USD ($)	[1]	May 07, 2015
Schedule of Equity Method Investments [Line Items]
Total other assets		$ 2,058	$ 2,225
Net property, plant and equipment		5,711	5,878
Total Assets		8,301	8,522
Liabilities		$ 6,037	$ 5,982
Power Generation Capacity, Megawatts | MW	[2],[3]	4,686
Spring Canyon [Member]
Schedule of Equity Method Investments [Line Items]
Total other assets		$ 4
Net property, plant and equipment		101
Intangible Assets, Net (Excluding Goodwill)		0
Total Assets		105
Liabilities		6
Noncontrolling Interest in Variable Interest Entity		69
Net Assets		$ 30
Wind Farms [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW	[3]	1,999
Wind Farms [Member] | Spring Canyon II [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW		32
Wind Farms [Member] | Spring Canyon [Member]
Schedule of Equity Method Investments [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired					90.10%
Wind Farms [Member] | Spring Canyon III [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW		28
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,
[3]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.

Variable Interest Entities NRG

Variable Interest Entities NRG Wind TE Holdco (Details)		Feb. 19, 2016USD ($)	Nov. 03, 2015USD ($)	Sep. 30, 2016USD ($)MW	Dec. 31, 2015USD ($)	[1]	Nov. 02, 2015USD ($)MW
Schedule of Equity Method Investments [Line Items]
Total other assets				$ 2,058,000,000	$ 2,225,000,000
Total Assets				8,301,000,000	8,522,000,000
Liabilities				$ 6,037,000,000	$ 5,982,000,000
Power Generation Capacity, Megawatts | MW	[2],[3]			4,686
November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Net Assets				$ 392,000,000
Intangible Assets, Net (Excluding Goodwill)				2,000,000
Total other assets				189,000,000
Total Assets				826,000,000
Liabilities				$ 225,000,000
November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Number of Facilities							12
Payments to Acquire Businesses, Gross		$ 207,000,000	$ 209,000,000
Business Acquisition, Consideration Transferred, Working Capital		$ 2,000,000
Pre-Flip Point [Member] | November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Cash Available for Distributions			75.00%
Post-Flip Point [Member] | November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Cash Available for Distributions			68.60%
Wind Farms [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW	[3]			1,999
Wind Farms [Member] | November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Power Generation Capacity, Megawatts | MW							814
Financial Institutions [Member] | November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Business Combination, Acquisition of Less than 100 Percent, Noncontrolling Interest, Fair Value			$ 159,000,000
Taxable Income Allocation, Pre-Flip			99.00%
Taxable Income Allocation, Post-Flip			8.53%
Financial Institutions [Member] | Pre-determined Date Through Flip Point If Flip Has Not Occured [Member] | November 2015 Drop Down Assets [Member]
Schedule of Equity Method Investments [Line Items]
Percentage of Cash Available for Distributions			100.00%
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(d) Total net capacity excludes 43 MW for RPV Holdco and 52 MW for DGPV Holdco 1 and DGPV Holdco 2 projects,
[3]	a) Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of September 30, 2016.

Fair Value of Financial Instr41

Fair Value of Financial Instruments Fair Value of Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Reported Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Net	$ 35	$ 47	[1]
Long-term debt — affiliate	618	618	[1]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	5,100	5,060	[1]
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Financing Receivable, Net	35	47	[1]
Long-term debt — affiliate	614	553	[1]
Long-term Debt and Capital Lease Obligations, Including Current Maturities	5,108	4,974	[1]
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	850	413
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	$ 4,872	$ 5,114
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Fair Value of Financial Instr42

Fair Value of Financial Instruments Fair Value of Financial Instruments - Recurring Fair Value (Details) - USD ($)		Sep. 30, 2016	Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset, Fair Value, Gross Asset		$ 1,000,000
Derivative Liability, Fair Value, Gross Liability		139,000,000	$ 100,000,000	[1]
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	[2]	1,000,000	0
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 Assets (Liabilities), at Fair Value, Net		0	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	[2]	139,000,000	100,000,000
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, 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	[2]	138,000,000	98,000,000
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	[2]	1,000,000	0
Derivative Liability, Fair Value, Gross Liability	[2]	$ 1,000,000	$ 2,000,000
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) There were no derivative assets or liabilities classified as Level 1 or Level 3 as of September 30, 2016, and December 31, 2015.

Fair Value of Financial Instr43

Fair Value of Financial Instruments Fair Value of Financial Instruments - Credit Risk and Derivative FV Measurements (Details) $ in Millions	9 Months Ended
	Sep. 30, 2016USD ($)
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	$ 4
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure	$ 2,600
Estimated Counterparty Credit Risk Exposure to Certain Counterparties, Period	5 years
Gain (Loss) on Derivative Instruments [Member]
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	$ 3
Interest Expense [Member]
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

Accounting for Derivative Ins44

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - FV of Derivatives (Details) - USD ($) $ in Millions	Sep. 30, 2016	Dec. 31, 2015
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 1
Derivative Liability, Fair Value, Gross Liability	139	$ 100	[1]
Derivative, Collateral, Right to Reclaim Cash	0	0
Derivative, Collateral, Obligation to Return Cash	0	0
Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	123	90	[1]
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1
Derivative Liability, Fair Value, Gross Liability	16	10	[1]
Interest Rate Contract Current [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	29	34	[1]
Interest Rate Contract Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	2	3	[1]
Interest Rate Contract Non Current [Member] | Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	94	56	[1]
Interest Rate Contract Non Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	0
Derivative Liability, Fair Value, Gross Liability	13	5	[1]
Commodity Contract Current [Member] | Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	1
Derivative Liability, Fair Value, Gross Liability	1	2	[1]
United States of America, Dollars | Interest [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	1,875	1,991	[2]
MMbtu [Member] | Natural Gas [Member]
Derivatives, Fair Value [Line Items]
Derivative, Notional Amount	$ 3	$ 4	[2]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Accounting for Derivative Ins45

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - AOCI (Details) - USD ($) $ in Millions	3 Months Ended			9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	[1]	Sep. 30, 2016	Sep. 30, 2015		Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015	[1]	Dec. 31, 2014	[1]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (148)	$ (123)		$ (148)	$ (123)	[1]	$ (168)	$ (99)	$ (83)		$ (82)
Mark-to-market of cash flow hedge accounting contracts	14	(46)		(62)	(54)	[1]
Losses expected to be realized from OCL during the next 12 months				20
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	6	6		13	13	[1]
Noncontrolling Interest [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	(4)	(3)		(4)	(3)	[1]
Successor [Member]
Derivative [Line Items]
Accumulated Other Comprehensive Loss	$ (144)	$ (120)		$ (144)	$ (120)	[1]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Accounting for Derivative Ins46

Accounting for Derivative Instruments and Hedging Activities Accounting for Derivative Instruments and Hedging Activities - Impact on Statement of Operations (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Interest Rate Contract [Member] | Interest Expense [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives	$ (2,000,000)	$ 6,000,000	$ 7,000,000	$ (13,000,000)
Commodity Contract [Member] | Sales [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Unrealized Gain (Loss) on Derivatives		$ 2,000,000	$ 0	$ (1,000,000)

Long-term Debt Long-term Debt -

Long-term Debt Long-term Debt - Debt Table (Details) - USD ($) $ in Thousands		Aug. 24, 2016	Jul. 15, 2016	Jul. 31, 2016	Sep. 30, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Long-term debt — affiliate					$ 618,000	$ 618,000	[1]
Long-term Debt					5,718,000	5,678,000	[2]
Current portion of long-term debt — external					281,000	264,000	[1],[2]
Deferred Finance Costs, Net					55,000	53,000	[2]
Long-term Debt, Excluding Current Maturities					5,382,000	5,361,000	[2]
5.375% Senior Notes due in 2024 [Member]
Debt Instrument [Line Items]
Senior Notes					$ 500,000	500,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				5.375%
5.00% Senior Notes due in 2026 [Member]
Debt Instrument [Line Items]
Senior Notes					$ 350,000	0	[2]
Debt Instrument, Interest Rate, Stated Percentage					5.00%
Intercompany Credit Agreement due 2019 [Member]
Debt Instrument [Line Items]
Long-term debt — affiliate					$ 337,000	337,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				3.58%
Intercompany Credit Agreement due 2020 [Member]
Debt Instrument [Line Items]
Long-term debt — affiliate					$ 281,000	281,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				3.325%
NRG Yield Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Long-term Debt	[4]				$ 0	306,000	[2]
Debt Instrument, Description of Variable Rate Basis	[4]				1 month LIBOR
Debt Instrument, Basis Spread on Variable Rate					2.75%
Proceeds from Issuance of Debt					$ 60,000
Repayments of Debt		$ 193,000		$ 28,000	366,000
Alta Wind I, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 245,000	252,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				7.015%
Alta Wind II, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 194,000	198,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				5.696%
Alta Wind III, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 201,000	206,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				6.067%
Alta Wind IV, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 130,000	133,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				5.938%
Alta Wind V, lease financing arrangement, due 2035 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 208,000	213,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				6.071%
Alta Realty Investments, due 2031 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 32,000	33,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				7.00%
Alta Wind Asset Management, due 2031 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 18,000	19,000	[2]
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					$ 443,000	485,000	[2]
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					$ 385,000	418,000	[2]
Walnut Creek Energy, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 322,000	351,000	[2]
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					$ 175,000	181,000	[2]
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					$ 183,000	189,000	[2]
Debt Instrument, Description of Variable Rate Basis					3-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					$ 98,000	108,000	[2]
Laredo Ridge Wind, LLC, due in 2026 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 101,000	104,000	[2]
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					$ 58,000	62,000	[2]
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					$ 57,000	60,000	[2]
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					$ 51,000	52,000	[2]
WCEP Holdings, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 46,000	46,000	[2]
Debt Instrument, Description of Variable Rate Basis					3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate					3.00%
Other Debt [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 0	2,000	[2]
Letters of Credit Outstanding, Amount					0
Roadrunner Financing Agreement [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 37,000	40,000	[2]
Debt Instrument, Description of Variable Rate Basis					3-Month LIBOR
Debt Instrument, Basis Spread on Variable Rate					1.625%
Kansas South Facility, due 2031 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 31,000	33,000	[2]
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					$ 20,000	21,000	[2]
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					$ 28,000	29,000	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				6.00%
Project [Domain]
Debt Instrument [Line Items]
Long-term Debt					$ 4,250,000	4,254,000	[2]
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					$ 147,000	154,000	[2]
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					$ 70,000	72,000	[2]
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					$ 771,000	793,000	[2]
Debt Instrument, Interest Rate, Stated Percentage			4.68%
Proceeds from Debt, Net of Issuance Costs			$ 97,500
Proceeds from Issuance of Debt			$ 200,000
CVSR Holdco due 2037 [Member]
Debt Instrument [Line Items]
Long-term Debt					$ 199,000	$ 0	[2]
Debt Instrument, Interest Rate, Stated Percentage	[3]				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	[4]				$ 64,000
Letter of Credit [Member] | Alta Wind I, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					16,000
Letter of Credit [Member] | Alta Wind II, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					23,000
Letter of Credit [Member] | Alta Wind III, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					23,000
Letter of Credit [Member] | Alta Wind IV, lease financing arrangement, due 2034 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					16,000
Letter of Credit [Member] | Alta Wind V, lease financing arrangement, due 2035 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					26,000
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					82,000
Letter of Credit [Member] | Marsh Landing Term Loan Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					33,000
Letter of Credit [Member] | Walnut Creek Energy, LLC, due in 2023 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					49,000
Letter of Credit [Member] | Tapestry Wind LLC due in 2021 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					20,000
Letter of Credit [Member] | Viento Funding II, Inc., due in 2023 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					27,000
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] | Laredo Ridge Wind, LLC, due in 2026 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					10,000
Letter of Credit [Member] | South Trent Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					10,000
Letter of Credit [Member] | Avra Valley Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					3,000
Letter of Credit [Member] | High Desert Facility [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					8,000
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					5,000
Letter of Credit [Member] | Kansas South Facility, due 2031 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					4,000
Letter of Credit [Member] | NRG Solar Blythe LLC Credit Agreement Due 2028 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					6,000
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					37,000
Letter of Credit [Member] | Borrego Financing Agreement, due 2024 [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount					5,000
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					$ 13,000
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]	(c) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	As of September 30, 2016, L+ equals 3 month LIBOR plus x%, except for the Alpine term loan, Marsh Landing term loan, 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 and Viento, where L+ equals 6 month LIBOR plus x%.
[4]	(b) Applicable rate is determined by the borrower leverage ratio, as defined in the credit agreement.

Long-term Debt Long-term Debt48

Long-term Debt Long-term Debt - Corporate Debt (Details) - USD ($) $ in Millions		Oct. 31, 2016	Aug. 24, 2016	Aug. 18, 2016	Jul. 15, 2016	Jul. 31, 2016	Sep. 30, 2016	Sep. 01, 2016	Aug. 31, 2016
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage									48.95%
NRG Yield Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt							$ 60
Repayments of Debt			$ 193			$ 28	366
Line of Credit Facility, Fair Value of Amount Outstanding							$ 0
CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt					$ 200
Debt Instrument, Interest Rate, Stated Percentage					4.68%
Proceeds from Debt, Net of Issuance Costs					$ 97.5
5.00% Senior Notes due in 2026 [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Stated Percentage							5.00%
Proceeds from Issuance of Unsecured Debt				$ 350
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] | CVSR Financing Agreement [Member]
Debt Instrument [Line Items]
Letters of Credit Outstanding, Amount							$ 0
Subsequent Event [Member] | NRG Energy Center Minneapolis Series D Notes [Member]
Debt Instrument [Line Items]
Proceeds from Issuance of Debt		$ 125
Debt Instrument, Interest Rate, Stated Percentage		3.55%
CVSR [Member] | Utility-Scale Solar [Member]
Debt Instrument [Line Items]
Equity Method Investment, Ownership Percentage							100.00%
CVSR [Member]
Debt Instrument [Line Items]
Business Acquisition, Percentage of Voting Interests Acquired								51.05%
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt								$ 496
[1]	(b) Applicable rate is determined by the borrower leverage ratio, as defined in the credit agreement.

Segment Reporting (Details)

Segment Reporting (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended
		Sep. 30, 2016	Sep. 30, 2015		Sep. 30, 2016	Sep. 30, 2015		Dec. 31, 2015	[4]
Segment Reporting
Operating revenues		$ 272	$ 256	[1],[2]	$ 789	$ 729	[1],[2]
Cost of operations		76	82	[2]	238	246	[2]
Depreciation and amortization		75	69	[1],[2]	224	222	[1],[2]
General and administrative		3	2	[2]	8	8	[1],[2]
Business Combination, Acquisition Related Costs		0	1	[1],[2]	0	2	[1],[2]
Operating income (loss)		118	102	[1],[2]	319	251	[1],[2]
Equity in earnings of unconsolidated affiliates		13	12	[1],[2]	29	19	[1],[2],[3]
Other income, net		1	0	[1]	3	2	[1],[2]
Gains (Losses) on Extinguishment of Debt		0	(2)	[1],[2]	0	(9)	[1],[2],[3]
Interest expense		(68)	(68)	[1],[2]	(204)	(195)	[1],[2]
Net Income		64	44	[1],[2]	147	68	[1],[2],[3]
Total Assets		8,301			8,301			$ 8,522
Conventional Generation [Member]
Segment Reporting
Operating revenues		82	86	[2]	246	247	[2]
Cost of operations		14	15	[2]	53	51	[2]
Depreciation and amortization		20	19	[2]	60	61	[2]
General and administrative		0	0	[2]	0	0	[2]
Business Combination, Acquisition Related Costs	[2]		0			0
Operating income (loss)		48	52	[2]	133	135	[2]
Equity in earnings of unconsolidated affiliates		3	3	[2]	10	10	[2]
Other income, net		1			1	1	[2]
Gains (Losses) on Extinguishment of Debt	[2]		0			(7)
Interest expense		(13)	(11)	[2]	(36)	(36)	[2]
Net Income		39	44	[2]	108	103	[2]
Total Assets		2,001			2,001
Corporate
Segment Reporting
Operating revenues		0	0	[2]	0	0	[2]
Cost of operations		0	0	[2]	0	0	[2]
Depreciation and amortization		0	0	[2]	0	0	[2]
General and administrative		3	2	[2]	8	8	[2]
Business Combination, Acquisition Related Costs	[2]		1			2
Operating income (loss)		(3)	(3)	[2]	(8)	(10)	[2]
Equity in earnings of unconsolidated affiliates		0	0	[2]	0	0	[2]
Other income, net		0			0	0	[2]
Gains (Losses) on Extinguishment of Debt	[2]		0			0
Interest expense		(16)	(15)	[2]	(48)	(38)	[2]
Net Income		(19)	(18)	[2]	(56)	(48)	[2]
Total Assets		90			90
Thermal [Member]
Segment Reporting
Operating revenues		48	46	[2]	131	135	[2]
Cost of operations		31	31	[2]	87	96	[2]
Depreciation and amortization		5	5	[2]	15	14	[2]
General and administrative		0	0	[2]	0	0	[2]
Business Combination, Acquisition Related Costs	[2]		0			0
Operating income (loss)		12	10	[2]	29	25	[2]
Equity in earnings of unconsolidated affiliates		0	0	[2]	0	0	[2]
Other income, net		0			0	0	[2]
Gains (Losses) on Extinguishment of Debt	[2]		0			0
Interest expense		(2)	(1)	[2]	(5)	(5)	[2]
Net Income		10	9	[2]	24	20	[2]
Total Assets		427			427
Renewables
Segment Reporting
Operating revenues		142	124	[2]	412	347	[2]
Cost of operations		31	36	[2]	98	99	[2]
Depreciation and amortization		50	45	[2]	149	147	[2]
General and administrative		0	0	[2]	0	0	[2]
Business Combination, Acquisition Related Costs	[2]		0			0
Operating income (loss)		61	43	[2]	165	101	[2]
Equity in earnings of unconsolidated affiliates		10	9	[2]	19	9	[2]
Other income, net		0			2	1	[2]
Gains (Losses) on Extinguishment of Debt	[2]		(2)			(2)
Interest expense		(37)	(41)	[2]	(115)	(116)	[2]
Net Income		34	$ 9	[2]	71	$ (7)	[2]
Total Assets		$ 5,783			$ 5,783
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Related Party Transactions (Det

Related Party Transactions (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended			9 Months Ended			12 Months Ended
	Oct. 31, 2016	Sep. 30, 2016	Sep. 30, 2015	[1]	Sep. 30, 2016	Sep. 30, 2015		Dec. 31, 2015
Related Party Transaction
General and administrative		$ 3	$ 2		$ 8	$ 8	[1],[2]
Accounts payable — affiliate		29			29			$ 86	[3]
Due to Affiliate, Noncurrent		618			618			618	[3]
GenOn Energy Services LLC [Member]
Related Party Transaction
Due to Affiliate		1			1			6
NRG Repowering Holdings LLC [Member]
Related Party Transaction
Cost of Natural Gas Purchases					1	4
NRG Yield [Member] | NRG [Member]
Related Party Transaction
Management Services Fee, Increase								0.5
General and administrative					6	6
NRG Yield [Member] | NRG [Member] | Scenario, Plan [Member]
Related Party Transaction
Management Services Fee, Annual					7.5
NRG Yield, Inc. [Member] | NRG [Member]
Related Party Transaction
Due to Affiliate		3			3
November 2015 Drop Down Assets [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Other Revenues from Transactions with Related Party						17
Elbow Creek [Member] | NRG [Member]
Related Party Transaction
Revenues					6
Thermal [Member] | NRG [Member]
Related Party Transaction
Due to Affiliate		23			23			29
Accounts payable — affiliate		12			12
Due to Affiliate, Noncurrent		11			11
Related Party Transaction, Expenses from Transactions with Related Party					15	21
NRG Energy Center Dover [Member] | NRG [Member]
Related Party Transaction
Revenues					4
NRG Energy Center Minneapolis LLC [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party					5	6
Marsh Landing [Member] | GenOn Energy Services LLC [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party					9	11
El Segundo [Member] | NRG El Segundo Operations, Inc. [Member]
Related Party Transaction
Due to Affiliate		$ 1			1			$ 1
Related Party Transaction, Expenses from Transactions with Related Party					4	4
Gen Conn Energy LLC [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party					4	3
CVSR [Member] | NRG Energy Services LLC [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party					2	4
Operations and Maintenance services [Member] | November 2015 Drop Down Assets [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party					4	3
Support services [Member] | November 2015 Drop Down Assets [Member] | NRG [Member]
Related Party Transaction
Related Party Transaction, Expenses from Transactions with Related Party					$ 2	$ 2
Subsequent Event [Member]
Related Party Transaction
Repayments of Related Party Debt	$ 4
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidating Finan51

Condensed Consolidating Financial Information CP Income Statement (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2015	[7]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		$ 272		$ 256	[1],[2]	$ 789		$ 729	[1],[2]
Operating Costs and Expenses [Abstract]
Cost of operations		76		82	[1]	238		246	[1]
Depreciation and amortization		75		69	[1],[2]	224		222	[1],[2]
General and administrative		3		2	[2]	8		8	[1],[2]
Total operating costs and expenses		154		154	[1]	470		478	[1]
Operating income (loss)		118		102	[1],[2]	319		251	[1],[2]
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		0		0		0		0
Equity in earnings of unconsolidated affiliates		13		12	[1],[2]	29		19	[1],[2],[3]
Other income, net		1		0	[1]	3		2	[1],[2]
Gains (Losses) on Extinguishment of Debt		0		(2)	[1],[2]	0		(9)	[1],[2],[3]
Interest expense		68		68	[1],[2]	204		195	[1],[2]
Total other income (expense), net		(54)		(58)	[1]	(172)		(183)	[1]
Net Income (Loss)		64		44	[1],[2]	147		68	[1],[2],[3]
Less: Net loss attributable to noncontrolling interests		(36)		(18)	[1]	(62)		(34)	[1]
Net Income Attributable to NRG Yield LLC		100		62	[1]	209		102	[1]
NRG Yield LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0	[4]	0		0	[4]
Operating Costs and Expenses [Abstract]
Cost of operations		0		0	[4]	0		0	[4]
Depreciation and amortization		0		0	[4]	0		0	[4]
General and administrative		0		0	[4]	0		0	[4]
Total operating costs and expenses		0		0	[4]	0		0	[4]
Operating income (loss)		0		0	[4]	0		0	[4]
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		100		62	[4]	209		102	[4]
Equity in earnings of unconsolidated affiliates		0		0	[4]	0		0	[4]
Other income, net						0		0	[4]
Gains (Losses) on Extinguishment of Debt	[4]			0				0
Interest expense		0		0	[4]	0		0	[4]
Total other income (expense), net		100		62	[4]	209		102	[4]
Net Income (Loss)		100		62	[4]	209		102	[4]
Less: Net loss attributable to noncontrolling interests		0		0	[4]	0		0	[4]
Net Income Attributable to NRG Yield LLC		100		62	[4]	209		102	[4]
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		7		7		17		17
Operating Costs and Expenses [Abstract]
Cost of operations		3		4		10		11
Depreciation and amortization		2		1		4		3
General and administrative		0		0		0		0
Total operating costs and expenses		5		5		14		14
Operating income (loss)		2		2		3		3
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		4		(9)		21		(28)
Equity in earnings of unconsolidated affiliates		(1)		0		6		0
Other income, net						0		0
Gains (Losses) on Extinguishment of Debt				0				0
Interest expense		0		0		0		0
Total other income (expense), net		3		(9)		27		(28)
Net Income (Loss)		5		(7)		30		(25)
Less: Net loss attributable to noncontrolling interests		0		0		0		0
Net Income Attributable to NRG Yield LLC		5		(7)		30		(25)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		265		248	[4]	772		703	[4]
Operating Costs and Expenses [Abstract]
Cost of operations		73		78	[4]	228		235	[4]
Depreciation and amortization		73		68	[4]	220		219	[4]
General and administrative		0		0	[4]	0		0	[4]
Total operating costs and expenses		146		146	[4]	448		454	[4]
Operating income (loss)		119		102	[4]	324		249	[4]
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		0		0	[4]	0		0	[4]
Equity in earnings of unconsolidated affiliates		0		0	[4]	(2)		0	[4]
Other income, net						3		2	[4]
Gains (Losses) on Extinguishment of Debt	[4]			(2)				(9)
Interest expense		51		54	[4]	156		157	[4]
Total other income (expense), net		(50)		(56)	[4]	(155)		(164)	[4]
Net Income (Loss)		69		46	[4]	169		85	[4]
Less: Net loss attributable to noncontrolling interests		(1)		2	[4]	(1)		(2)	[4]
Net Income Attributable to NRG Yield LLC		70		44	[4]	170		87	[4]
NRG Yield Operating LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		1	[4]			9	[4]
Operating Costs and Expenses [Abstract]
Cost of operations		0		0	[4]	0		0	[4]
Depreciation and amortization		0		0	[4]	0		0	[4]
General and administrative		3		2	[4]	8		8	[4]
Total operating costs and expenses		3		3	[4]	8		10	[4]
Operating income (loss)		(3)		(2)	[4]	(8)		(1)	[4]
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		70		48	[4]	178		88	[4]
Equity in earnings of unconsolidated affiliates		14		12	[4]	25		19	[4]
Other income, net						0		0	[4]
Gains (Losses) on Extinguishment of Debt	[4]			0				0
Interest expense		17		14	[4]	48		38	[4]
Total other income (expense), net		67		46	[4]	155		69	[4]
Net Income (Loss)		64		44	[4]	147		68	[4]
Less: Net loss attributable to noncontrolling interests		(36)		(18)	[4]	(62)		(34)	[4]
Net Income Attributable to NRG Yield LLC		100		62	[4]	209		102	[4]
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Operating Costs and Expenses [Abstract]
Cost of operations		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Depreciation and amortization		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
General and administrative		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Total operating costs and expenses		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Operating income (loss)		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Costs and Expenses [Abstract]
Equity in earnings of consolidated affiliates		(174)	[5]	(101)	[4],[6]	(408)	[5]	(162)	[4],[6]
Equity in earnings of unconsolidated affiliates		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Other income, net						0	[5]	0	[4],[6]
Gains (Losses) on Extinguishment of Debt	[4],[6]			0				0
Interest expense		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Total other income (expense), net		(174)	[5]	(101)	[4],[6]	(408)	[5]	(162)	[4],[6]
Net Income (Loss)		(174)	[5]	(101)	[4],[6]	(408)	[5]	(162)	[4],[6]
Less: Net loss attributable to noncontrolling interests		1	[5]	(2)	[4],[6]	1	[5]	2	[4],[6]
Net Income Attributable to NRG Yield LLC		(175)	[5]	$ (99)	[4],[6]	(409)	[5]	$ (164)	[4],[6]
5.00% Senior Notes due in 2026 [Member]
Condensed Income Statements, Captions [Line Items]
Senior Notes		$ 350				$ 350				$ 0
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	All significant intercompany transactions have been eliminated in consolidation.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.
[7]	(c) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidating Finan52

Condensed Consolidating Financial Information CP Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	$ 64		$ 44	[1],[2]	$ 147		$ 68	[1],[2],[3]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	20		(40)	[4]	(49)		(41)	[4]
Other Comprehensive Income (Loss), Net of Tax	20		(40)	[4]	(49)		(41)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	84		4	[4]	98		27	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(27)		(19)	[4]	(62)		(35)	[4]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	111		23	[4]	160		62	[4]
NRG Yield LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	100		62	[5]	209		102	[5]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	11		(39)	[6]	(49)		(40)	[6]
Other Comprehensive Income (Loss), Net of Tax	11		(39)	[6]	(49)		(40)	[6]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	111		23	[6]	160		62	[6]
Less: Comprehensive loss attributable to noncontrolling interests	0		0	[6]	0		0	[6]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	111		23	[6]	160		62	[6]
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	5		(7)		30		(25)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0		0		0		0
Other Comprehensive Income (Loss), Net of Tax	0		0		0		0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	5		(7)		30		(25)
Less: Comprehensive loss attributable to noncontrolling interests	0		0		0		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	5		(7)		30		(25)
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	69		46	[5]	169		85	[5]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	18		(37)	[6]	(45)		(37)	[6]
Other Comprehensive Income (Loss), Net of Tax	18		(37)	[6]	(45)		(37)	[6]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	87		9	[6]	124		48	[6]
Less: Comprehensive loss attributable to noncontrolling interests	(1)		2	[6]	(1)		(2)	[6]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	88		7	[6]	125		50	[6]
NRG Yield Operating LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	64		44	[5]	147		68	[5]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	20		(40)	[6]	(49)		(41)	[6]
Other Comprehensive Income (Loss), Net of Tax	20		(40)	[6]	(49)		(41)	[6]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	84		4	[6]	98		27	[6]
Less: Comprehensive loss attributable to noncontrolling interests	(26)		(21)	[6]	(61)		(33)
Comprehensive Income (Loss) Attributable to NRG Yield LLC	110		25	[6]	159		60	[6]
Consolidation, Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(174)	[7]	(101)	[5],[8]	(408)	[7]	(162)	[5],[8]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(29)	[7]	76	[6],[9]	94	[7]	77	[6],[9]
Other Comprehensive Income (Loss), Net of Tax	(29)	[7]	76	[6],[9]	94	[7]	77	[6],[9]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(203)	[7]	(25)	[6],[9]	(314)	[7]	(85)	[6],[9]
Less: Comprehensive loss attributable to noncontrolling interests	0	[7]	0	[6],[9]	0	[7]	0	[6],[9]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	$ (203)	[10]	$ (25)	[6],[9]	$ (314)	[7]	$ (85)	[6],[9]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[7]	All significant intercompany transactions have been eliminated in consolidation.
[8]	(b) All significant intercompany transactions have been eliminated in consolidation.
[9]	(b) All significant intercompany transactions have been eliminated in consolidation.
[10]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan53

Condensed Consolidating Financial Information CP Balance Sheet (Details) - USD ($) $ in Millions		Sep. 30, 2016		Dec. 31, 2015		Sep. 30, 2015	[2]	Jun. 30, 2015		Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		$ 200		$ 110	[1]	$ 145		$ 145		$ 429	[2]
Restricted cash		138		131	[1]
Accounts receivable — trade		115		101	[1]
Accounts receivable — affiliate		3		4	[1]
Inventory		37		36	[1]
Derivative Asset		1
Notes receivable		17		17	[1]
Prepayments and other current assets		21		20	[1]
Total current assets		532		419	[1]
Net property, plant and equipment		5,711		5,878	[1]
Investment in consolidated subsidiaries		0		0
Equity investments in affiliates		690		697	[1]
Notes receivable		18		30	[1]
Intangible assets, net		1,303		1,362	[1]
Other non-current assets		47		136	[1]
Total other assets		2,058		2,225	[1]
Total Assets		8,301		8,522	[1]
Current portion of long-term debt — external		281		264	[1],[3]
Accounts payable — trade		23		23	[1]
Accounts payable — affiliate		29		86	[1]
Derivative instruments		32		39	[1]
Accrued expenses and other current liabilities		94		76	[1]
Current Liabilities		459		488	[1]
Other Liabilities
Long-term debt — external		4,764		4,743	[1]
Long-term debt — affiliate		618		618	[1]
Due to Related Parties, Noncurrent		11		0	[1]
Derivative instruments		107		61	[1]
Other non-current liabilities		78		72	[1]
Total non-current liabilities		5,578		5,494	[1]
Total Liabilities		6,037		5,982	[1]
Contributed capital		1,848		2,082	[1]
Retained earnings		164		93	[1]
Noncontrolling interest		396		460	[1]
Accumulated other comprehensive loss		(144)		(95)	[1]
Stockholders' Equity Attributable to Noncontrolling Interest		396		460
Total Members' Equity		2,264		2,540	[1]
Total Liabilities and Members’ Equity		8,301		8,522	[1]
NRG Yield LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		87		15	[4]			50		328
Restricted cash		0		0	[4]
Accounts receivable — trade		0		0	[4]
Accounts receivable — affiliate		2		55	[4]
Inventory		0		0	[4]
Derivative Asset		0
Notes receivable		0		0	[4]
Prepayments and other current assets		0		0	[4]
Total current assets		89		70	[4]
Net property, plant and equipment		0		0	[4]
Investment in consolidated subsidiaries		1,779		2,010	[4]
Equity investments in affiliates		0		0	[4]
Notes receivable		0		0	[4]
Intangible assets, net		0		0	[4]
Other non-current assets		0		0	[4]
Total other assets		1,779		2,010	[4]
Total Assets		1,868		2,080	[4]
Current portion of long-term debt — external		0		0	[4]
Accounts payable — trade		0		0	[4]
Accounts payable — affiliate		0		0	[4]
Derivative instruments		0		0	[4]
Accrued expenses and other current liabilities		0		0	[4]
Current Liabilities		0		0	[4]
Other Liabilities
Long-term debt — external		0		0	[4]
Long-term debt — affiliate		0		0	[4]
Due to Related Parties, Noncurrent		0
Derivative instruments		0		0	[4]
Other non-current liabilities		0		0	[4]
Total non-current liabilities		0		0	[4]
Total Liabilities		0		0	[4]
Contributed capital		1,848		2,082	[4]
Retained earnings		164		93	[4]
Accumulated other comprehensive loss		(144)		(95)	[4]
Stockholders' Equity Attributable to Noncontrolling Interest		0		0	[4]
Total Members' Equity		1,868		2,080	[4]
Total Liabilities and Members’ Equity		1,868		2,080	[4]
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		3		1
Accounts receivable — affiliate		0		4
Inventory		2		2
Derivative Asset		0
Notes receivable		0		0
Prepayments and other current assets		0		1
Total current assets		5		8
Net property, plant and equipment		58		61
Investment in consolidated subsidiaries		540		548
Equity investments in affiliates		76		70
Notes receivable		0		0
Intangible assets, net		56		57
Other non-current assets		0		0
Total other assets		672		675
Total Assets		735		744
Current portion of long-term debt — external		0		0
Accounts payable — trade		2		1
Accounts payable — affiliate		4		8
Derivative instruments		0		1
Accrued expenses and other current liabilities		1		1
Current Liabilities		7		11
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		11
Contributed capital		784		821
Retained earnings		(53)		(85)
Accumulated other comprehensive loss		(3)		(3)
Stockholders' Equity Attributable to Noncontrolling Interest		0		0
Total Members' Equity		728		733
Total Liabilities and Members’ Equity		735		744
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		113		95	[4]			95	[5]	101	[5]
Restricted cash		138		131	[4]
Accounts receivable — trade		112		100	[4]
Accounts receivable — affiliate		1		6	[4]
Inventory		35		34	[4]
Derivative Asset		1
Notes receivable		17		17	[4]
Prepayments and other current assets		20		19	[4]
Total current assets		437		402	[4]
Net property, plant and equipment		5,653		5,817	[4]
Investment in consolidated subsidiaries		0		0	[4]
Equity investments in affiliates		160		176	[4]
Notes receivable		18		30	[4]
Intangible assets, net		1,247		1,305	[4]
Other non-current assets		45		134	[4]
Total other assets		1,470		1,645	[4]
Total Assets		7,560		7,864	[4]
Current portion of long-term debt — external		281		267	[4]
Accounts payable — trade		18		19	[4]
Accounts payable — affiliate		18		46	[4]
Derivative instruments		32		38	[4]
Accrued expenses and other current liabilities		81		58	[4]
Current Liabilities		430		428	[4]
Other Liabilities
Long-term debt — external		3,925		3,943	[4]
Long-term debt — affiliate		0		0	[4]
Due to Related Parties, Noncurrent		11
Derivative instruments		107		61	[4]
Other non-current liabilities		78		72	[4]
Total non-current liabilities		4,121		4,076	[4]
Total Liabilities		4,551		4,504	[4]
Contributed capital		2,929		3,397	[4]
Retained earnings		156		(12)	[4]
Accumulated other comprehensive loss		(141)		(96)	[4]
Stockholders' Equity Attributable to Noncontrolling Interest		65		71	[4]
Total Members' Equity		3,009		3,360	[4]
Total Liabilities and Members’ Equity		7,560		7,864	[4]
NRG Yield Operating LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0		0	[4]			$ 0		$ 0
Restricted cash		0		0	[4]
Accounts receivable — trade		0		0	[4]
Accounts receivable — affiliate		0		10	[4]
Inventory		0		0	[4]
Derivative Asset		0
Notes receivable		0		3	[4]
Prepayments and other current assets		1		0	[4]
Total current assets		1		13	[4]
Net property, plant and equipment		0		0	[4]
Investment in consolidated subsidiaries		3,132		3,477	[4]
Equity investments in affiliates		454		451	[4]
Notes receivable		0		0	[4]
Intangible assets, net		0		0	[4]
Other non-current assets		2		2	[4]
Total other assets		3,588		3,930	[4]
Total Assets		3,589		3,943	[4]
Current portion of long-term debt — external		0		0	[4]
Accounts payable — trade		3		3	[4]
Accounts payable — affiliate		7		104	[4]
Derivative instruments		0		0	[4]
Accrued expenses and other current liabilities		12		17	[4]
Current Liabilities		22		124	[4]
Other Liabilities
Long-term debt — external		839		800	[4]
Long-term debt — affiliate		618		618	[4]
Due to Related Parties, Noncurrent		0
Derivative instruments		0		0	[4]
Other non-current liabilities		0		0	[4]
Total non-current liabilities		1,457		1,418	[4]
Total Liabilities		1,479		1,542	[4]
Contributed capital		1,832		2,014	[4]
Retained earnings		91		93	[4]
Accumulated other comprehensive loss		(144)		(95)	[4]
Stockholders' Equity Attributable to Noncontrolling Interest		331		389	[4]
Total Members' Equity		2,110		2,401	[4]
Total Liabilities and Members’ Equity		3,589		3,943	[4]
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0	[6]	0	[4],[7]
Restricted cash		0	[6]	0	[4],[8]
Accounts receivable — trade		0	[6]	0	[4],[8]
Accounts receivable — affiliate		0	[6]	(71)	[4],[8]
Inventory		0	[6]	0	[4],[8]
Derivative Asset	[6]	0
Notes receivable	[6]	0		(3)	[4]
Prepayments and other current assets	[6]	0		0	[4]
Total current assets	[6]	0		(74)	[4]
Net property, plant and equipment		0	[6]	0	[4],[8]
Investment in consolidated subsidiaries		(5,451)	[6]	(6,035)	[4],[7]
Equity investments in affiliates		0	[6]	0	[4],[7]
Notes receivable		0	[6]	0	[4],[7]
Intangible assets, net		0	[6]	0	[4],[7]
Other non-current assets		0	[6]	0	[4],[8]
Total other assets		(5,451)	[6]	(6,035)	[4],[8]
Total Assets		(5,451)	[6]	(6,109)	[4],[8]
Current portion of long-term debt — external		0	[6]	(3)	[4],[7]
Accounts payable — trade		0	[6]	0	[4],[7]
Accounts payable — affiliate		0	[6]	(72)	[4],[7]
Derivative instruments		0	[6]	0	[4],[7]
Accrued expenses and other current liabilities		0	[6]	0	[4],[7]
Current Liabilities		0	[6]	(75)	[4],[7]
Other Liabilities
Long-term debt — external		0	[6]	0	[4],[8]
Long-term debt — affiliate		0	[6]	0	[4],[8]
Due to Related Parties, Noncurrent	[6]	0
Derivative instruments		0	[6]	0	[4],[8]
Other non-current liabilities		0	[6]	0	[4],[8]
Total non-current liabilities		0	[6]	0	[4],[8]
Total Liabilities		0	[6]	(75)	[4],[8]
Contributed capital		(5,545)	[6]	(6,232)	[4],[8]
Retained earnings		(194)	[6]	4	[4],[8]
Accumulated other comprehensive loss		288	[6]	194	[4],[8]
Stockholders' Equity Attributable to Noncontrolling Interest		0	[6]	0	[4],[8]
Total Members' Equity		(5,451)	[6]	(6,034)	[4],[8]
Total Liabilities and Members’ Equity		$ (5,451)	[6]	$ (6,109)	[4],[8]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(c) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(b) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	All significant intercompany transactions have been eliminated in consolidation.
[7]	All significant intercompany transactions have been eliminated in consolidation.(b) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[8]	All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan54

Condensed Consolidating Financial Information CP Cash Flows (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2015		Jun. 30, 2015		Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from (Repayments of) Lines of Credit		$ (306)		$ 92	[1]
Net Cash Provided by Operating Activities		440		310	[1]
Intercompany transactions between Yield LLC and subsidiaries		0		0
Acquisition of businesses, net of cash acquired				(37)
Capital expenditures		(16)		(17)	[1]
Increase (Decrease) in Restricted Cash		(7)		(24)	[1]
Decrease in notes receivable		11		13	[1]
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital		16		16	[1]
Investments in unconsolidated affiliates		(69)		(351)	[1]
Net Cash Provided by (Used in) Investing Activities		(142)		(867)	[1]
Transfer of funds under intercompany cash management arrangement		0		0
Net contributions from noncontrolling interests		7		123	[1]
Distributions to NRG for CVSR and NRG Wind TE Holdco		(122)		(52)	[1]
Distributions to NRG for NRG Wind TE Holdco		0		599	[1]
Payment of distributions		127		99	[1]
Proceeds from issuance of long-term debt — external		(204)
Proceeds from the issuance of long-term debt — external		550		5	[1]
Net Cash (Used in) Provided by Financing Activities		(208)		273	[1]
Cash and Cash Equivalents, Period Increase (Decrease)		90		(284)	[1]
Cash and cash equivalents		200		145	[1]	$ 110	[2]	$ 145		$ 429	[1]
NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from (Repayments of) Lines of Credit		0		0
Net Cash Provided by Operating Activities		0		0
Intercompany transactions between Yield LLC and subsidiaries		145		(501)
Acquisition of businesses, net of cash acquired				0
Capital expenditures		0		0
Increase (Decrease) in Restricted Cash		0		0
Decrease in 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		145		(501)
Transfer of funds under intercompany cash management arrangement		54		(277)
Net contributions from noncontrolling interests		0		0
Distributions to NRG for CVSR and NRG Wind TE Holdco		0		0
Distributions to NRG for NRG Wind TE Holdco				599
Payment of distributions		127		99
Proceeds from issuance of long-term debt — external		0
Proceeds from the issuance of long-term debt — external		0		0
Net Cash (Used in) Provided by Financing Activities		(73)		223
Cash and Cash Equivalents, Period Increase (Decrease)		72		(278)
Cash and cash equivalents		87				15	[3]	50		328
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from (Repayments of) Lines of Credit		0		0
Net Cash Provided by Operating Activities		45		28
Intercompany transactions between Yield LLC and subsidiaries		0		0
Acquisition of businesses, net of cash acquired				0
Capital expenditures		0		0
Increase (Decrease) in Restricted Cash		0		0
Decrease in notes receivable		0		0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital		3		0
Investments in unconsolidated affiliates		(48)		(19)
Net Cash Provided by (Used in) Investing Activities		(45)		(19)
Transfer of funds under intercompany cash management arrangement		0		(9)
Net contributions from noncontrolling interests		0		0
Distributions to NRG for CVSR and NRG Wind TE Holdco		0		0
Distributions to NRG for NRG Wind TE Holdco				0
Payment of distributions		0		0
Proceeds from issuance of long-term debt — external		0
Proceeds from the issuance of long-term debt — external		0		0
Net Cash (Used in) Provided by Financing Activities		0		(9)
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]
Proceeds from (Repayments of) Lines of Credit		0		0	[4]
Net Cash Provided by Operating Activities		361		224	[4]
Intercompany transactions between Yield LLC and subsidiaries		0		0	[4]
Acquisition of businesses, net of cash acquired	[4]			0
Capital expenditures		(16)		(17)	[4]
Increase (Decrease) in Restricted Cash		(7)		(24)	[4]
Decrease in notes receivable		11		13	[4]
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital		0		0	[4]
Investments in unconsolidated affiliates		0		0	[4]
Net Cash Provided by (Used in) Investing Activities		(12)		(6)	[4]
Transfer of funds under intercompany cash management arrangement		0		0	[4]
Net contributions from noncontrolling interests		0		4	[4]
Distributions to NRG for CVSR and NRG Wind TE Holdco		(122)		(52)	[4]
Distributions to NRG for NRG Wind TE Holdco	[4]			0
Payment of distributions		204		0
Proceeds from issuance of long-term debt — external		(204)
Proceeds from the issuance of long-term debt — external		200		5	[4]
Net Cash (Used in) Provided by Financing Activities		(331)		(224)	[4]
Cash and Cash Equivalents, Period Increase (Decrease)		18		(6)	[4]
Cash and cash equivalents		113				95	[3]	95	[4]	101	[4]
NRG Yield Operating LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Proceeds from (Repayments of) Lines of Credit		(306)		92
Net Cash Provided by Operating Activities		34		58
Intercompany transactions between Yield LLC and subsidiaries		(145)		501
Acquisition of businesses, net of cash acquired				(37)
Capital expenditures		0		0
Increase (Decrease) in Restricted Cash		0		0
Decrease in notes receivable		0		0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital		13		16
Investments in unconsolidated affiliates		(21)		(332)
Net Cash Provided by (Used in) Investing Activities		(230)		(341)
Transfer of funds under intercompany cash management arrangement		(54)		286
Net contributions from noncontrolling interests		7		119
Distributions to NRG for CVSR and NRG Wind TE Holdco		0		0
Distributions to NRG for NRG Wind TE Holdco				0
Payment of distributions		204		0
Proceeds from issuance of long-term debt — external		0
Proceeds from the issuance of long-term debt — external		350		0
Net Cash (Used in) Provided by Financing Activities		196		283
Cash and Cash Equivalents, Period Increase (Decrease)		0		0
Cash and cash equivalents		0				0	[3]	$ 0		$ 0
Drop-down Acquisition [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		(77)		(489)
Drop-down Acquisition [Member] | NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		0		0
Drop-down Acquisition [Member] | Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		0		0
Drop-down Acquisition [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		0		0	[4]
Drop-down Acquisition [Member] | NRG Yield Operating LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		(77)		$ (489)
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Distributions to NRG for CVSR and NRG Wind TE Holdco		(122)
Cash and cash equivalents		$ 0	[5]			$ 0	[3],[6]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(b) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	All significant intercompany transactions have been eliminated in consolidation.
[6]	All significant intercompany transactions have been eliminated in consolidation.(b) Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed Consolidating Finan55

Condensed Consolidating Financial Information PP Income Statement (Details) - USD ($) $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Condensed Income Statements, Captions [Line Items]
Total operating revenues		$ 272		$ 256	[1],[2]	$ 789		$ 729	[1],[2]
Operating Costs and Expenses [Abstract]
Cost of operations		76		82	[1]	238		246	[1]
Depreciation and amortization		75		69	[1],[2]	224		222	[1],[2]
General and administrative		3		2	[2]	8		8	[1],[2]
Business Combination, Acquisition Related Costs		0		1	[1],[2]	0		2	[1],[2]
Total operating costs and expenses		154		154	[1]	470		478	[1]
Operating income (loss)		118		102	[1],[2]	319		251	[1],[2]
Equity in earnings of consolidated affiliates		0		0		0		0
Equity in earnings of unconsolidated affiliates		13		12	[1],[2]	29		19	[1],[2],[3]
Other income, net		1		0	[1]	3		2	[1],[2]
Gains (Losses) on Extinguishment of Debt		0		(2)	[1],[2]	0		(9)	[1],[2],[3]
Interest expense		68		68	[1],[2]	204		195	[1],[2]
Total other income (expense), net		(54)		(58)	[1]	(172)		(183)	[1]
Net Income (Loss)		64		44	[1],[2]	147		68	[1],[2],[3]
Less: Net loss attributable to noncontrolling interests		(36)		(18)	[1]	(62)		(34)	[1]
Net Income Attributable to NRG Yield LLC		100		62	[1]	209		102	[1]
NRG Yield LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		0	[4]	0		0	[4]
Operating Costs and Expenses [Abstract]
Cost of operations		0		0	[4]	0		0	[4]
Depreciation and amortization		0		0	[4]	0		0	[4]
General and administrative		0		0	[4]	0		0	[4]
Business Combination, Acquisition Related Costs	[4]			0				0
Total operating costs and expenses		0		0	[4]	0		0	[4]
Operating income (loss)		0		0	[4]	0		0	[4]
Equity in earnings of consolidated affiliates		100		62	[4]	209		102	[4]
Equity in earnings of unconsolidated affiliates		0		0	[4]	0		0	[4]
Other income, net						0		0	[4]
Gains (Losses) on Extinguishment of Debt	[4]			0				0
Interest expense		0		0	[4]	0		0	[4]
Total other income (expense), net		100		62	[4]	209		102	[4]
Net Income (Loss)		100		62	[4]	209		102	[4]
Less: Net loss attributable to noncontrolling interests		0		0	[4]	0		0	[4]
Net Income Attributable to NRG Yield LLC		100		62	[4]	209		102	[4]
Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		7		7		17		17
Operating Costs and Expenses [Abstract]
Cost of operations		3		4		10		11
Depreciation and amortization		2		1		4		3
General and administrative		0		0		0		0
Business Combination, Acquisition Related Costs				0				0
Total operating costs and expenses		5		5		14		14
Operating income (loss)		2		2		3		3
Equity in earnings of consolidated affiliates		4		(9)		21		(28)
Equity in earnings of unconsolidated affiliates		(1)		0		6		0
Other income, net						0		0
Gains (Losses) on Extinguishment of Debt				0				0
Interest expense		0		0		0		0
Total other income (expense), net		3		(9)		27		(28)
Net Income (Loss)		5		(7)		30		(25)
Less: Net loss attributable to noncontrolling interests		0		0		0		0
Net Income Attributable to NRG Yield LLC		5		(7)		30		(25)
Non-Guarantor Subsidiaries [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		265		248	[4]	772		703	[4]
Operating Costs and Expenses [Abstract]
Cost of operations		73		78	[4]	228		235	[4]
Depreciation and amortization		73		68	[4]	220		219	[4]
General and administrative		0		0	[4]	0		0	[4]
Business Combination, Acquisition Related Costs	[4]			0				0
Total operating costs and expenses		146		146	[4]	448		454	[4]
Operating income (loss)		119		102	[4]	324		249	[4]
Equity in earnings of consolidated affiliates		0		0	[4]	0		0	[4]
Equity in earnings of unconsolidated affiliates		0		0	[4]	(2)		0	[4]
Other income, net						3		2	[4]
Gains (Losses) on Extinguishment of Debt	[4]			(2)				(9)
Interest expense		51		54	[4]	156		157	[4]
Total other income (expense), net		(50)		(56)	[4]	(155)		(164)	[4]
Net Income (Loss)		69		46	[4]	169		85	[4]
Less: Net loss attributable to noncontrolling interests		(1)		2	[4]	(1)		(2)	[4]
Net Income Attributable to NRG Yield LLC		70		44	[4]	170		87	[4]
NRG Yield Operating LLC [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0		1	[4]			9	[4]
Operating Costs and Expenses [Abstract]
Cost of operations		0		0	[4]	0		0	[4]
Depreciation and amortization		0		0	[4]	0		0	[4]
General and administrative		3		2	[4]	8		8	[4]
Business Combination, Acquisition Related Costs				1	[4]			2
Total operating costs and expenses		3		3	[4]	8		10	[4]
Operating income (loss)		(3)		(2)	[4]	(8)		(1)	[4]
Equity in earnings of consolidated affiliates		70		48	[4]	178		88	[4]
Equity in earnings of unconsolidated affiliates		14		12	[4]	25		19	[4]
Other income, net						0		0	[4]
Gains (Losses) on Extinguishment of Debt	[4]			0				0
Interest expense		17		14	[4]	48		38	[4]
Total other income (expense), net		67		46	[4]	155		69	[4]
Net Income (Loss)		64		44	[4]	147		68	[4]
Less: Net loss attributable to noncontrolling interests		(36)		(18)	[4]	(62)		(34)	[4]
Net Income Attributable to NRG Yield LLC		100		62	[4]	209		102	[4]
Consolidation, Eliminations [Member]
Condensed Income Statements, Captions [Line Items]
Total operating revenues		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Operating Costs and Expenses [Abstract]
Cost of operations		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Depreciation and amortization		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
General and administrative		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Business Combination, Acquisition Related Costs	[4],[6]			0				0
Total operating costs and expenses		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Operating income (loss)		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Equity in earnings of consolidated affiliates		(174)	[5]	(101)	[4],[6]	(408)	[5]	(162)	[4],[6]
Equity in earnings of unconsolidated affiliates		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Other income, net						0	[5]	0	[4],[6]
Gains (Losses) on Extinguishment of Debt	[4],[6]			0				0
Interest expense		0	[5]	0	[4],[6]	0	[5]	0	[4],[6]
Total other income (expense), net		(174)	[5]	(101)	[4],[6]	(408)	[5]	(162)	[4],[6]
Net Income (Loss)		(174)	[5]	(101)	[4],[6]	(408)	[5]	(162)	[4],[6]
Less: Net loss attributable to noncontrolling interests		1	[5]	(2)	[4],[6]	1	[5]	2	[4],[6]
Net Income Attributable to NRG Yield LLC		$ (175)	[5]	$ (99)	[4],[6]	$ (409)	[5]	$ (164)	[4],[6]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	All significant intercompany transactions have been eliminated in consolidation.
[6]	(b) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan56

Condensed Consolidating Financial Information PP Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended				9 Months Ended
	Sep. 30, 2016		Sep. 30, 2015		Sep. 30, 2016		Sep. 30, 2015
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	$ 64		$ 44	[1],[2]	$ 147		$ 68	[1],[2],[3]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	20		(40)	[4]	(49)		(41)	[4]
Other Comprehensive Income (Loss), Net of Tax	20		(40)	[4]	(49)		(41)	[4]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	84		4	[4]	98		27	[4]
Less: Comprehensive loss attributable to noncontrolling interests	(27)		(19)	[4]	(62)		(35)	[4]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	111		23	[4]	160		62	[4]
NRG Yield LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	100		62	[5]	209		102	[5]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	11		(39)	[6]	(49)		(40)	[6]
Other Comprehensive Income (Loss), Net of Tax	11		(39)	[6]	(49)		(40)	[6]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	111		23	[6]	160		62	[6]
Less: Comprehensive loss attributable to noncontrolling interests	0		0	[6]	0		0	[6]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	111		23	[6]	160		62	[6]
Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	5		(7)		30		(25)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0		0		0		0
Other Comprehensive Income (Loss), Net of Tax	0		0		0		0
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	5		(7)		30		(25)
Less: Comprehensive loss attributable to noncontrolling interests	0		0		0		0
Comprehensive Income (Loss) Attributable to NRG Yield LLC	5		(7)		30		(25)
Non-Guarantor Subsidiaries [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	69		46	[5]	169		85	[5]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	18		(37)	[6]	(45)		(37)	[6]
Other Comprehensive Income (Loss), Net of Tax	18		(37)	[6]	(45)		(37)	[6]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	87		9	[6]	124		48	[6]
Less: Comprehensive loss attributable to noncontrolling interests	(1)		2	[6]	(1)		(2)	[6]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	88		7	[6]	125		50	[6]
NRG Yield Operating LLC [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	64		44	[5]	147		68	[5]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	20		(40)	[6]	(49)		(41)	[6]
Other Comprehensive Income (Loss), Net of Tax	20		(40)	[6]	(49)		(41)	[6]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	84		4	[6]	98		27	[6]
Less: Comprehensive loss attributable to noncontrolling interests	(26)		(21)	[6]	(61)		(33)
Comprehensive Income (Loss) Attributable to NRG Yield LLC	110		25	[6]	159		60	[6]
Consolidation, Eliminations [Member]
Condensed Statement of Income Captions [Line Items]
Net Income (Loss)	(174)	[7]	(101)	[5],[8]	(408)	[7]	(162)	[5],[8]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(29)	[7]	76	[6],[9]	94	[7]	77	[6],[9]
Other Comprehensive Income (Loss), Net of Tax	(29)	[7]	76	[6],[9]	94	[7]	77	[6],[9]
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest	(203)	[7]	(25)	[6],[9]	(314)	[7]	(85)	[6],[9]
Less: Comprehensive loss attributable to noncontrolling interests	0	[7]	0	[6],[9]	0	[7]	0	[6],[9]
Comprehensive Income (Loss) Attributable to NRG Yield LLC	$ (203)	[10]	$ (25)	[6],[9]	$ (314)	[7]	$ (85)	[6],[9]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[7]	All significant intercompany transactions have been eliminated in consolidation.
[8]	(b) All significant intercompany transactions have been eliminated in consolidation.
[9]	(b) All significant intercompany transactions have been eliminated in consolidation.
[10]	(a) All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan57

Condensed Consolidating Financial Information PP Balance Sheet (Details) - USD ($) $ in Millions		Sep. 30, 2016		Dec. 31, 2015		Sep. 30, 2015	[2]	Jun. 30, 2015		Dec. 31, 2014
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		$ 200		$ 110	[1]	$ 145		$ 145		$ 429	[2]
Restricted cash		138		131	[1]
Accounts receivable — trade		115		101	[1]
Accounts receivable — affiliate		3		4	[1]
Inventory		37		36	[1]
Notes receivable		17		17	[1]
Prepayments and other current assets		21		20	[1]
Total current assets		532		419	[1]
Net property, plant and equipment		5,711		5,878	[1]
Investment in consolidated subsidiaries		0		0
Equity investments in affiliates		690		697	[1]
Notes receivable		18		30	[1]
Intangible assets, net		1,303		1,362	[1]
Other non-current assets		47		136	[1]
Total other assets		2,058		2,225	[1]
Total Assets		8,301		8,522	[1]
Current portion of long-term debt — external		281		264	[1],[3]
Accounts payable — trade		23		23	[1]
Accounts payable — affiliate		29		86	[1]
Derivative instruments		32		39	[1]
Accrued expenses and other current liabilities		94		76	[1]
Current Liabilities		459		488	[1]
Other Liabilities
Long-term debt — external		4,764		4,743	[1]
Long-term debt — affiliate		618		618	[1]
Derivative instruments		107		61	[1]
Other non-current liabilities		78		72	[1]
Total non-current liabilities		5,578		5,494	[1]
Total Liabilities		6,037		5,982	[1]
Contributed capital		1,848		2,082	[1]
Retained earnings		164		93	[1]
Accumulated other comprehensive loss		(144)		(95)	[1]
Noncontrolling interest		396		460
Total Members' Equity		2,264		2,540	[1]
Total Liabilities and Members’ Equity		8,301		8,522	[1]
NRG Yield LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		87		15	[4]			50		328
Restricted cash		0		0	[4]
Accounts receivable — trade		0		0	[4]
Accounts receivable — affiliate		2		55	[4]
Inventory		0		0	[4]
Notes receivable		0		0	[4]
Prepayments and other current assets		0		0	[4]
Total current assets		89		70	[4]
Net property, plant and equipment		0		0	[4]
Investment in consolidated subsidiaries		1,779		2,010	[4]
Equity investments in affiliates		0		0	[4]
Notes receivable		0		0	[4]
Intangible assets, net		0		0	[4]
Other non-current assets		0		0	[4]
Total other assets		1,779		2,010	[4]
Total Assets		1,868		2,080	[4]
Current portion of long-term debt — external		0		0	[4]
Accounts payable — trade		0		0	[4]
Accounts payable — affiliate		0		0	[4]
Derivative instruments		0		0	[4]
Accrued expenses and other current liabilities		0		0	[4]
Current Liabilities		0		0	[4]
Other Liabilities
Long-term debt — external		0		0	[4]
Long-term debt — affiliate		0		0	[4]
Derivative instruments		0		0	[4]
Other non-current liabilities		0		0	[4]
Total non-current liabilities		0		0	[4]
Total Liabilities		0		0	[4]
Contributed capital		1,848		2,082	[4]
Retained earnings		164		93	[4]
Accumulated other comprehensive loss		(144)		(95)	[4]
Noncontrolling interest		0		0	[4]
Total Members' Equity		1,868		2,080	[4]
Total Liabilities and Members’ Equity		1,868		2,080	[4]
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		3		1
Accounts receivable — affiliate		0		4
Inventory		2		2
Notes receivable		0		0
Prepayments and other current assets		0		1
Total current assets		5		8
Net property, plant and equipment		58		61
Investment in consolidated subsidiaries		540		548
Equity investments in affiliates		76		70
Notes receivable		0		0
Intangible assets, net		56		57
Other non-current assets		0		0
Total other assets		672		675
Total Assets		735		744
Current portion of long-term debt — external		0		0
Accounts payable — trade		2		1
Accounts payable — affiliate		4		8
Derivative instruments		0		1
Accrued expenses and other current liabilities		1		1
Current Liabilities		7		11
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		11
Contributed capital		784		821
Retained earnings		(53)		(85)
Accumulated other comprehensive loss		(3)		(3)
Noncontrolling interest		0		0
Total Members' Equity		728		733
Total Liabilities and Members’ Equity		735		744
Non-Guarantor Subsidiaries [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		113		95	[4]			95	[5]	101	[5]
Restricted cash		138		131	[4]
Accounts receivable — trade		112		100	[4]
Accounts receivable — affiliate		1		6	[4]
Inventory		35		34	[4]
Notes receivable		17		17	[4]
Prepayments and other current assets		20		19	[4]
Total current assets		437		402	[4]
Net property, plant and equipment		5,653		5,817	[4]
Investment in consolidated subsidiaries		0		0	[4]
Equity investments in affiliates		160		176	[4]
Notes receivable		18		30	[4]
Intangible assets, net		1,247		1,305	[4]
Other non-current assets		45		134	[4]
Total other assets		1,470		1,645	[4]
Total Assets		7,560		7,864	[4]
Current portion of long-term debt — external		281		267	[4]
Accounts payable — trade		18		19	[4]
Accounts payable — affiliate		18		46	[4]
Derivative instruments		32		38	[4]
Accrued expenses and other current liabilities		81		58	[4]
Current Liabilities		430		428	[4]
Other Liabilities
Long-term debt — external		3,925		3,943	[4]
Long-term debt — affiliate		0		0	[4]
Derivative instruments		107		61	[4]
Other non-current liabilities		78		72	[4]
Total non-current liabilities		4,121		4,076	[4]
Total Liabilities		4,551		4,504	[4]
Contributed capital		2,929		3,397	[4]
Retained earnings		156		(12)	[4]
Accumulated other comprehensive loss		(141)		(96)	[4]
Noncontrolling interest		65		71	[4]
Total Members' Equity		3,009		3,360	[4]
Total Liabilities and Members’ Equity		7,560		7,864	[4]
NRG Yield Operating LLC [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0		0	[4]			$ 0		$ 0
Restricted cash		0		0	[4]
Accounts receivable — trade		0		0	[4]
Accounts receivable — affiliate		0		10	[4]
Inventory		0		0	[4]
Notes receivable		0		3	[4]
Prepayments and other current assets		1		0	[4]
Total current assets		1		13	[4]
Net property, plant and equipment		0		0	[4]
Investment in consolidated subsidiaries		3,132		3,477	[4]
Equity investments in affiliates		454		451	[4]
Notes receivable		0		0	[4]
Intangible assets, net		0		0	[4]
Other non-current assets		2		2	[4]
Total other assets		3,588		3,930	[4]
Total Assets		3,589		3,943	[4]
Current portion of long-term debt — external		0		0	[4]
Accounts payable — trade		3		3	[4]
Accounts payable — affiliate		7		104	[4]
Derivative instruments		0		0	[4]
Accrued expenses and other current liabilities		12		17	[4]
Current Liabilities		22		124	[4]
Other Liabilities
Long-term debt — external		839		800	[4]
Long-term debt — affiliate		618		618	[4]
Derivative instruments		0		0	[4]
Other non-current liabilities		0		0	[4]
Total non-current liabilities		1,457		1,418	[4]
Total Liabilities		1,479		1,542	[4]
Contributed capital		1,832		2,014	[4]
Retained earnings		91		93	[4]
Accumulated other comprehensive loss		(144)		(95)	[4]
Noncontrolling interest		331		389	[4]
Total Members' Equity		2,110		2,401	[4]
Total Liabilities and Members’ Equity		3,589		3,943	[4]
Consolidation, Eliminations [Member]
Condensed Balance Sheet Statements, Captions [Line Items]
Cash and cash equivalents		0	[6]	0	[4],[7]
Restricted cash		0	[6]	0	[4],[8]
Accounts receivable — trade		0	[6]	0	[4],[8]
Accounts receivable — affiliate		0	[6]	(71)	[4],[8]
Inventory		0	[6]	0	[4],[8]
Notes receivable	[6]	0		(3)	[4]
Prepayments and other current assets	[6]	0		0	[4]
Total current assets	[6]	0		(74)	[4]
Net property, plant and equipment		0	[6]	0	[4],[8]
Investment in consolidated subsidiaries		(5,451)	[6]	(6,035)	[4],[7]
Equity investments in affiliates		0	[6]	0	[4],[7]
Notes receivable		0	[6]	0	[4],[7]
Intangible assets, net		0	[6]	0	[4],[7]
Other non-current assets		0	[6]	0	[4],[8]
Total other assets		(5,451)	[6]	(6,035)	[4],[8]
Total Assets		(5,451)	[6]	(6,109)	[4],[8]
Current portion of long-term debt — external		0	[6]	(3)	[4],[7]
Accounts payable — trade		0	[6]	0	[4],[7]
Accounts payable — affiliate		0	[6]	(72)	[4],[7]
Derivative instruments		0	[6]	0	[4],[7]
Accrued expenses and other current liabilities		0	[6]	0	[4],[7]
Current Liabilities		0	[6]	(75)	[4],[7]
Other Liabilities
Long-term debt — external		0	[6]	0	[4],[8]
Long-term debt — affiliate		0	[6]	0	[4],[8]
Derivative instruments		0	[6]	0	[4],[8]
Other non-current liabilities		0	[6]	0	[4],[8]
Total non-current liabilities		0	[6]	0	[4],[8]
Total Liabilities		0	[6]	(75)	[4],[8]
Contributed capital		(5,545)	[6]	(6,232)	[4],[8]
Retained earnings		(194)	[6]	4	[4],[8]
Accumulated other comprehensive loss		288	[6]	194	[4],[8]
Noncontrolling interest		0	[6]	0	[4],[8]
Total Members' Equity		(5,451)	[6]	(6,034)	[4],[8]
Total Liabilities and Members’ Equity		$ (5,451)	[6]	$ (6,109)	[4],[8]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(c) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(b) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[6]	All significant intercompany transactions have been eliminated in consolidation.
[7]	All significant intercompany transactions have been eliminated in consolidation.(b) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[8]	All significant intercompany transactions have been eliminated in consolidation.

Condensed Consolidating Finan58

Condensed Consolidating Financial Information PP Cash Flows (Details) - USD ($) $ in Millions		9 Months Ended
		Sep. 30, 2016		Sep. 30, 2015		Dec. 31, 2015		Jun. 30, 2015		Dec. 31, 2014
Condensed Cash Flow Statements, Captions [Line Items]
Net contributions from noncontrolling interests		$ 7		$ 123	[1]
Net Cash Provided by Operating Activities		440		310	[1]
Intercompany transactions between Yield LLC and subsidiaries		0		0
Acquisition of businesses, net of cash acquired				(37)
Capital expenditures		(16)		(17)	[1]
Increase (Decrease) in Restricted Cash		(7)		(24)	[1]
Decrease in notes receivable		11		13	[1]
Proceeds from Renewable Energy Grants		0		22
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital		16		16	[1]
Investments in unconsolidated affiliates		(69)		(351)	[1]
Net Cash Provided by (Used in) Investing Activities		(142)		(867)	[1]
Distributions to NRG for CVSR and NRG Wind TE Holdco		(122)		(52)	[1]
Proceeds from the issuance of Class C and Class A units		0		599	[1]
Transfer of funds under intercompany cash management arrangement		0		0
Payment of distributions		(127)		(99)	[1]
Proceeds from the issuance of long-term debt — external		550		5	[1]
Proceeds from (Repayments of) Lines of Credit		(306)		92	[1]
Payments of Debt Issuance Costs		(6)		(7)	[1]
Proceeds from issuance of long-term debt — external		(204)
Repayments of Long-term Debt		(204)		(669)
Net Cash (Used in) Provided by Financing Activities		(208)		273	[1]
Cash and Cash Equivalents, Period Increase (Decrease)		90		(284)	[1]
Cash and cash equivalents		200		145	[1]	$ 110	[2]	$ 145		$ 429	[1]
Proceeds from issuance of long-term debt — affiliate		0		281	[1]
NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net contributions from noncontrolling interests		0		0
Net Cash Provided by Operating Activities		0		0
Intercompany transactions between Yield LLC and subsidiaries		145		(501)
Acquisition of businesses, net of cash acquired				0
Capital expenditures		0		0
Increase (Decrease) in Restricted Cash		0		0
Decrease in notes receivable		0		0
Proceeds from Renewable Energy Grants				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		145		(501)
Distributions to NRG for CVSR and NRG Wind TE Holdco		0		0
Proceeds from the issuance of Class C and Class A units				599
Transfer of funds under intercompany cash management arrangement		54		(277)
Payment of distributions		(127)		(99)
Proceeds from the issuance of long-term debt — external		0		0
Proceeds from (Repayments of) Lines of Credit		0		0
Payments of Debt Issuance Costs		0		0
Proceeds from issuance of long-term debt — external		0
Repayments of Long-term Debt				0
Net Cash (Used in) Provided by Financing Activities		(73)		223
Cash and Cash Equivalents, Period Increase (Decrease)		72		(278)
Cash and cash equivalents		87				15	[3]	50		328
Proceeds from issuance of long-term debt — affiliate				0
Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net contributions from noncontrolling interests		0		0
Net Cash Provided by Operating Activities		45		28
Intercompany transactions between Yield LLC and subsidiaries		0		0
Acquisition of businesses, net of cash acquired				0
Capital expenditures		0		0
Increase (Decrease) in Restricted Cash		0		0
Decrease in notes receivable		0		0
Proceeds from Renewable Energy Grants				0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital		3		0
Investments in unconsolidated affiliates		(48)		(19)
Net Cash Provided by (Used in) Investing Activities		(45)		(19)
Distributions to NRG for CVSR and NRG Wind TE Holdco		0		0
Proceeds from the issuance of Class C and Class A units				0
Transfer of funds under intercompany cash management arrangement		0		(9)
Payment of distributions		0		0
Proceeds from the issuance of long-term debt — external		0		0
Proceeds from (Repayments of) Lines of Credit		0		0
Payments of Debt Issuance Costs		0		0
Proceeds from issuance of long-term debt — external		0
Repayments of Long-term Debt				0
Net Cash (Used in) Provided by Financing Activities		0		(9)
Cash and Cash Equivalents, Period Increase (Decrease)		0		0
Cash and cash equivalents		0				0		0		0
Proceeds from issuance of long-term debt — affiliate				0
Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net contributions from noncontrolling interests		0		4	[4]
Net Cash Provided by Operating Activities		361		224	[4]
Intercompany transactions between Yield LLC and subsidiaries		0		0	[4]
Acquisition of businesses, net of cash acquired	[4]			0
Capital expenditures		(16)		(17)	[4]
Increase (Decrease) in Restricted Cash		(7)		(24)	[4]
Decrease in notes receivable		11		13	[4]
Proceeds from Renewable Energy Grants	[4]			22
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital		0		0	[4]
Investments in unconsolidated affiliates		0		0	[4]
Net Cash Provided by (Used in) Investing Activities		(12)		(6)	[4]
Distributions to NRG for CVSR and NRG Wind TE Holdco		(122)		(52)	[4]
Proceeds from the issuance of Class C and Class A units	[4]			0
Transfer of funds under intercompany cash management arrangement		0		0	[4]
Payment of distributions		(204)		0
Proceeds from the issuance of long-term debt — external		200		5	[4]
Proceeds from (Repayments of) Lines of Credit		0		0	[4]
Payments of Debt Issuance Costs		(1)		(6)	[4]
Proceeds from issuance of long-term debt — external		(204)
Repayments of Long-term Debt	[4]			(175)
Net Cash (Used in) Provided by Financing Activities		(331)		(224)	[4]
Cash and Cash Equivalents, Period Increase (Decrease)		18		(6)	[4]
Cash and cash equivalents		113				95	[3]	95	[4]	101	[4]
Proceeds from issuance of long-term debt — affiliate	[4]			0
NRG Yield Operating LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Net contributions from noncontrolling interests		7		119
Net Cash Provided by Operating Activities		34		58
Intercompany transactions between Yield LLC and subsidiaries		(145)		501
Acquisition of businesses, net of cash acquired				(37)
Capital expenditures		0		0
Increase (Decrease) in Restricted Cash		0		0
Decrease in notes receivable		0		0
Proceeds from Renewable Energy Grants				0
Proceeds from Equity Method Investment, Dividends or Distributions, Return of Capital		13		16
Investments in unconsolidated affiliates		(21)		(332)
Net Cash Provided by (Used in) Investing Activities		(230)		(341)
Distributions to NRG for CVSR and NRG Wind TE Holdco		0		0
Proceeds from the issuance of Class C and Class A units				0
Transfer of funds under intercompany cash management arrangement		(54)		286
Payment of distributions		(204)		0
Proceeds from the issuance of long-term debt — external		350		0
Proceeds from (Repayments of) Lines of Credit		(306)		92
Payments of Debt Issuance Costs		(5)		(1)
Proceeds from issuance of long-term debt — external		0
Repayments of Long-term Debt				(494)
Net Cash (Used in) Provided by Financing Activities		196		283
Cash and Cash Equivalents, Period Increase (Decrease)		0		0
Cash and cash equivalents		0				0	[3]	$ 0		$ 0
Proceeds from issuance of long-term debt — affiliate				281
Drop-down Acquisition [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		(77)		(489)
Drop-down Acquisition [Member] | NRG Yield LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		0		0
Drop-down Acquisition [Member] | Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		0		0
Drop-down Acquisition [Member] | Non-Guarantor Subsidiaries [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		0		0	[4]
Drop-down Acquisition [Member] | NRG Yield Operating LLC [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Acquisition of businesses, net of cash acquired		(77)		$ (489)
Consolidation, Eliminations [Member]
Condensed Cash Flow Statements, Captions [Line Items]
Distributions to NRG for CVSR and NRG Wind TE Holdco		(122)
Cash and cash equivalents		$ 0	[5]			$ 0	[3],[6]
[1]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[3]	(b) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[4]	(a) Retrospectively adjusted as discussed in Note 1, Nature of Business.
[5]	All significant intercompany transactions have been eliminated in consolidation.
[6]	All significant intercompany transactions have been eliminated in consolidation.(b) Retrospectively adjusted as discussed in Note 1, Nature of Business.