Clearway Energy (CWEN) 10-Q 7 Aug 14 2014 Q2 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014	Jun. 30, 2014	Jul. 31, 2014
		Common Class A	Common Class A	Common Class B
Document And Entity Information [Abstract]	'	'	'	'
Entity Registrant Name	'NRG Yield, Inc.	'	'	'
Entity Central Index Key	'0001567683	'	'	'
Document Type	'10-Q	'	'	'
Document Period End Date	30-Jun-14	'	'	'
Amendment Flag	'false	'	'	'
Current Fiscal Year End Date	'--12-31	'	'	'
Entity Current Reporting Status	'Yes	'	'	'
Entity Filer Category	'Non-accelerated Filer	'	'	'
Document Fiscal Year Focus	'2014	'	'	'
Document Fiscal Period Focus	'Q2	'	'	'
Class of Stock [Line Items]	'	'	'	'
Entity Common Stock, Shares Outstanding	'	34,586,250	22,511,250	42,738,750

Condensed_Consolidated_Stateme

Condensed Consolidated Statements of Operations (USD $)	3 Months Ended				6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013		Jun. 30, 2014		Jun. 30, 2013
Operating Revenues	'		'		'		'
Total operating revenues	$134		$82	[1]	$274		$135	[1]
Operating Costs and Expenses	'		'		'		'
Cost of operations	45		32	[1]	105		61	[1]
Depreciation and amortization	36		10	[1]	60		20	[1]
General and administrative b affiliate	2		2	[1]	4		4	[1]
Total operating costs and expenses	83		44	[1]	169		85	[1]
Operating Income	51		38	[1]	105		50	[1]
Other Income/(Expense)	'		'		'		'
Equity in earnings of unconsolidated affiliates	14		2	[1]	15		6	[1]
Other income, net	0		1	[1]	1		1	[1]
Interest expense	-29		-6	[1]	-56		-11	[1]
Total other expense	-15		-3	[1]	-40		-4	[1]
Income/(loss) before income taxes	36		35	[1]	65		46	[1]
Income tax expense	2		0	[1]	5		0	[1]
Net Income	34		35	[1]	60		46	[1]
Less: Pre-acquisition net income of Acquired ROFO Assets	9		1	[1]	17		1	[1]
Net Income Excluding Pre-acquisition Net Income of Acquired ROFO Assets	25		34	[1]	43		45	[1]
Income attributable to NRG (b)	19	[2]	'		33	[1],[2]	'
Net Income Attributable to NRG Yield, Inc.	$6		'		$10		'
Basic and Diluted Earnings per Share Attributable to Class A Common Stockholders	'		'		'		'
Weighted average number of Class A common shares outstanding	23		'		23		'
Basic and Diluted Earnings per Class A Common Share	$0.26		'		$0.42		'
Dividends per Class A Common Share	$0.35		'		$0.68		'
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.
[2]	The calculation of income attributable to NRG excludes pre-acquisition net income of the Acquired ROFO Assets.

Condensed_Consolidated_Stateme1

Condensed Consolidated Statements of Comprehensive Income (USD $)	3 Months Ended			6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'		'	'
Net income/(loss)	$34	$35	[1]	$60	$46	[1]
Other Comprehensive (Loss) Income, net of tax	'	'		'	'
Other comprehensive (loss) income	-12	25	[1]	-24	29	[1]
Comprehensive Income	22	60	[1]	36	75	[1]
Less: Pre-acquisition net income of Acquired ROFO Assets	9	1	[1]	17	1	[1]
Less: Comprehensive income attributable to NRG	11	59		18	74
Comprehensive Income Attributable to NRG Yield, Inc.	$2	$0	[1]	$1	$0	[1]
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed_Consolidated_Stateme2

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	3 Months Ended		6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement of Comprehensive Income [Abstract]	'	'	'	'
Unrealized gain/loss on derivatives, income tax expense /(benefit)	$0	$13	$0	$15

Condensed_Consolidated_Balance

Condensed Consolidated Balance Sheets (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, unless otherwise specified
Current Assets	'	'
Cash and cash equivalents	$87	$59	[1]
Restricted cash	23	67	[1]
Accounts receivable b trade	56	51	[1]
Accounts receivable b affiliate	1	5	[1]
Inventory	14	15	[1]
Derivative instruments	1	1	[1]
Notes receivable	6	6	[1]
Renewable energy grant receivable	0	147	[1]
Deferred income taxes	1	0	[1]
Prepayments and other current assets	7	27	[1]
Total current assets	196	378	[1]
In service	2,477	2,459	[1]
Under construction	11	6	[1]
Total property, plant and equipment	2,488	2,465	[1]
Less accumulated depreciation	233	174	[1]
Net property, plant and equipment	2,255	2,291	[1]
Other Assets	'	'
Equity investments in affiliates	253	227	[1]
Intangible assets, net of accumulated amortization of $8 and $6	105	103	[1]
Derivative instruments	5	20	[1]
Deferred income taxes	312	146	[1]
Other non-current assets	93	50	[1]
Total other assets	785	569	[1]
Total Assets	3,236	3,238	[1]
Current Liabilities	'	'
Current portion of long-term debt	119	214	[1]
Derivative instruments	30	31	[1]
Accrued expenses and other current liabilities	19	30	[1]
Total current liabilities	233	369	[1]
Other Liabilities	'	'
Long-term debt	1,880	1,569	[1]
Deferred Tax Liabilities, Net, Noncurrent	5	5	[1]
Derivative instruments	24	16	[1]
Other non-current liabilities	21	27	[1]
Total non-current liabilities	1,930	1,617	[1]
Total Liabilities	2,163	1,986	[1]
Preferred stock, $0.01 par value; 10,000,000 shares authorized; none issued	0	0	[1]
Stockholders' Equity	'	'
Additional paid-in capital	815	621	[1]
Retained earnings	3	8	[1]
Accumulated other comprehensive loss	-9	0	[1]
Noncontrolling interest	264	623	[1]
Total Stockholders' Equity	1,073	1,252	[1]
Total Liabilities and Stockholdersb Equity	3,236	3,238	[1]
Non-affiliate	'	'
Other Assets	'	'
Notes receivable	0	2	[1]
Current Liabilities	'	'
Accounts payable	15	42	[1]
Affiliate	'	'
Other Assets	'	'
Notes receivable	17	21	[1]
Current Liabilities	'	'
Accounts payable	50	52	[1]
Common Class A	'	'
Other Liabilities	'	'
Class A common stock, $0.01 par value; 500,000,000 shares authorized; 22,511,250 shares issued Class B common stock, $0.01 par value; 500,000,000 shares authorized; 42,738,750 shares issued	$0	$0	[1]
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed_Consolidated_Balance1

Condensed Consolidated Balance Sheets (Parenthetical) (USD $)	Jun. 30, 2014	Dec. 31, 2013
In Millions, except Share data, unless otherwise specified
Preferred Stock, Par or Stated Value Per Share	$0.01	$0.01
Preferred Stock, Shares Authorized	10,000,000	10,000,000
Preferred Stock, Shares Issued	0	0
Property, plant and equipment, accumulated depreciation	$233	$174	[1]
Intangible assets, accumulated amortization	$8	$6
Common Class A	'	'
Common Stock, Par Value Per Share	$0.01	$0.01
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	22,511,250	22,511,250
Common Class B	'	'
Common Stock, Shares Authorized	500,000,000	500,000,000
Common Stock, Shares, Issued	42,738,750	42,738,750
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Condensed_Consolidated_Stateme3

Condensed Consolidated Statements Of Cash Flows (USD $)	6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014		Jun. 30, 2013
Cash Flows from Operating Activities	'		'
Net income/(loss)	$60		$46	[1]
Adjustments to reconcile net income to net cash provided by (used in) operating activities:	'		'
Distributions and equity in earnings of unconsolidated affiliates	-8		3	[1]
Depreciation and amortization	60		20	[1]
Amortization of financing costs and debt discount/premium	5		1	[1]
Amortization of intangibles and out-of-market contracts	1		1	[1]
Changes in deferred income taxes	5		0	[1]
Changes in derivative instruments	0		-10	[1]
Changes in other working capital	-50		-80	[1]
Net Cash Provided by (Used in) Operating Activities	73		-19	[1]
Cash Flows from Investing Activities	'		'
Payment to NRG for Acquired ROFO Assets	-357		0	[1]
Capital expenditures	-29		-267	[1]
Decrease (increase) in restricted cash	44		-52	[1]
Decrease in notes receivable, including affiliates	5		3	[1]
Proceeds from renewable energy grants	137		24	[1]
Investments in unconsolidated affiliates	-15		-19	[1]
Other	11		0	[1]
Net Cash Used in Investing Activities	-204		-311	[1]
Cash Flows from Financing Activities	'		'
Payment of dividends and distributions	-44		0	[1]
Proceeds from issuance of long-term debt b external	386		519	[1]
Payment of debt issuance costs	-13		-4	[1]
Payment of borrowings from affiliate	0		-2	[1]
Net Cash Provided by Financing Activities	159		326	[1]
Net Increase in Cash and Cash Equivalents	28		-4	[1]
Cash and Cash Equivalents at Beginning of Period	59	[1]	22	[1]
Cash and Cash Equivalents at End of Period	87		18	[1]
Affiliate	'		'
Cash Flows from Financing Activities	'		'
Capital contributions from NRG	2		150	[1]
Dividends and returns of capital to NRG	-24		-312	[1]
Non-affiliate	'		'
Cash Flows from Financing Activities	'		'
Payments for long-term debt b external	($148)		($25)	[1]
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Nature_of_Business_Notes

Nature of Business (Notes)	6 Months Ended
	Jun. 30, 2014
Nature of Business Disclosure [Abstract]	'
Nature of Business	'
	Nature of Business
	NRG Yield, Inc., or the Company, was formed by NRG as a Delaware corporation on December 20, 2012. On July 22, 2013, the Company issued 22,511,250 shares of Class A common stock in an initial public offering. The Company utilized the net proceeds of the initial public offering to acquire 19,011,250 Class A units of NRG Yield LLC from NRG, in return for $395 million and 3,500,000 Class A units of NRG Yield LLC directly from NRG Yield LLC in return for $73 million.  In connection with the acquisition of the Class A units, the Company also became the sole managing member of NRG Yield LLC thereby acquiring a controlling interest in NRG Yield LLC.
	Immediately prior to the acquisition, NRG Yield LLC acquired a portfolio of contracted renewable and conventional generation and thermal infrastructure assets, primarily located in the Northeast, Southwest and California regions of the United States, from NRG in return for Class B units in NRG Yield LLC.  These assets were simultaneously contributed by NRG Yield LLC to its direct wholly owned subsidiary NRG Yield Operating LLC at their historical cost.  As of June 30, 2014, the Company owned 34.5% of NRG Yield LLC and consolidates the results of NRG Yield LLC through its controlling interest, with NRG's 65.5% interest shown as noncontrolling interest in the financial statements. As described in Note 3, Business Acquisitions, on June 30, 2014, NRG Yield Operating LLC acquired the TA High Desert, RE Kansas South, and El Segundo projects from NRG for total cash consideration of $357 million plus assumed project level debt.
	The following table represents the structure of the Company as of June 30, 2014:
	On July 29, 2014, the Company issued 12,075,000 shares of Class A common stock for net proceeds, after underwriting discount and expenses, of $630 million. The Company utilized the proceeds of the offering to acquire 12,075,000 additional Class A units of NRG Yield LLC and, as a result, it currently owns 44.7% of NRG Yield LLC, with NRG retaining 55.3% of NRG Yield LLC.
	For the period prior to the initial public offering, the accompanying unaudited combined financial statements represent the combination of the assets that NRG Yield LLC acquired and were prepared using NRG's historical basis in the assets and liabilities. For the purposes of the unaudited combined financial statements, the term "NRG Yield" represents the accounting predecessor, or the combination of the acquired businesses. For all periods subsequent to the initial public offering, the accompanying unaudited consolidated financial statements represent the consolidated results of the Company, which consolidates NRG Yield LLC through its controlling interest.
	As of June 30, 2014, the Company's operating assets are comprised of the following projects:
	Projects	Percentage Ownership		Net Capacity (MW) (a)	Offtake Counterparty	Expiration
	Conventional
	GenConn Middletown	49.95	%	95	Connecticut Light & Power	2041
	GenConn Devon	49.95	%	95	Connecticut Light & Power	2040
	Marsh Landing	100	%	720	Pacific Gas and Electric	2023
	El Segundo	100	%	550	Southern California Edison	2023
				1,460
	Utility-Scale Solar
	Alpine	100	%	66	Pacific Gas and Electric	2033
	Avenal	49.95	%	23	Pacific Gas and Electric	2031
	Avra Valley	100	%	25	Tucson Electric Power	2032
	Blythe	100	%	21	Southern California Edison	2029
	Borrego	100	%	26	San Diego Gas and Electric	2038
	CVSR	48.95	%	122	Pacific Gas and Electric	2038
	Roadrunner	100	%	20	El Paso Electric	2031
	RE Kansas South	100	%	20	Pacific Gas and Electric	2033
	TA High Desert	100	%	20	Southern California Edison	2033
				343
	Distributed Solar
	AZ DG Solar Projects	100	%	5	Various	2025 - 2033
	PFMG DG Solar Projects	51	%	5	Various	2032
				10
	Wind
	South Trent	100	%	101	AEP Energy Partners	2029
	Thermal
	Thermal equivalent MWt(b)	100	%	1,346	Various	Various
	Thermal generation	100	%	123	Various	Various
	Total net capacity (excluding equivalent MWt)			2,037
	(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 June 30, 2014.
	(b) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 118 MWt which is available under the right-to-use provisions contained in agreements between two of NRG Yield Inc.'s thermal facilities and certain of their customers.
	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 of the 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.
	The historical combined financial statements include allocations of certain NRG corporate expenses. Management believes the assumptions and methodology underlying the allocation of general corporate overhead expenses are reasonable. The allocated costs include legal, accounting, tax, treasury, information technology, insurance, employee benefit costs, and other corporate costs. However, such expenses may not be indicative of the actual level of expense that would have been incurred if the Company had operated as an independent, publicly-traded company during the periods prior to the initial public offering or of the costs expected to be incurred in the future. Allocation of NRG corporate expenses was $4 million for the period ending June 30, 2013. In connection with the initial public offering, the Company entered into a management services agreement with NRG for various services, including human resources, accounting, tax, legal, information systems, treasury, and risk management. Costs incurred by the Company under this agreement were $4 million for the six months ending June 30, 2014.
	For all periods prior to the initial public offering, member's equity represents the combined equity of the Company's subsidiaries, including adjustments necessary to present the Company's financial statements as if the Company were in existence as of the beginning of the periods represented. Member's equity represents NRG's equity in the subsidiaries, and accordingly, in connection with the initial public offering, the historical equity balance as of that date was reclassified into noncontrolling interest. Subsequent to the initial public offering, stockholders' equity represents the equity associated with the Class A common stockholders, with the equity associated with the Class B common stockholders, or NRG, classified as noncontrolling interest.
	The acquisition of the TA High Desert, RE Kansas South, and El Segundo projects from NRG on June 30, 2014 was accounted for as a transfer of entities 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. Accordingly, the Company prepared its consolidated financial statements to reflect the transfer as if it had taken place on January 1, 2013, or from the date the entities were under common control, which was May 13, 2013 for RE Kansas South and March 28, 2013 for TA High Desert, which represent the dates these entities were acquired by NRG. Member's equity represents NRG's equity in the subsidiaries, and accordingly, in connection with the acquisition by the Company, the balance was reclassified into noncontrolling interest.
	The accompanying unaudited interim consolidated financial statements have been prepared in accordance with the Securities and Exchange Commission’s, or SEC’s, regulations for interim financial information. Accordingly, they do not include all of the information and notes required by U.S. 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 set forth in the 2013 Form 10-K. Interim results are not necessarily indicative of results for a full year.
	In the opinion of management, the accompanying unaudited interim consolidated financial statements contain all material adjustments consisting of normal and recurring accruals necessary to present fairly the Company's consolidated financial position as of June 30, 2014, and the results of operations, comprehensive income and cash flows for the six months ended June 30, 2014, and 2013.

Summary_of_Significant_Account

Summary of Significant Accounting Policies (Notes)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Significant Accounting Policies [Text Block]	'
	Summary of Significant Accounting Policies
	Use of Estimates
	The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amount of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements. They also impact the reported amount of net earnings during the reporting period. Actual results could be different from these estimates.
	Noncontrolling Interest
	The following table reflects the changes in the Company's noncontrolling interest balance:
		(In millions)
	Balance as of December 31, 2013 (As previously reported)	$	382
	Net Assets of Acquired ROFO Assets as of December 31, 2013	241
	Balance as of December 31, 2013 (As currently reported)	623
	Payment to NRG for Acquired ROFO assets	(357		)
	Comprehensive income, including pre-acquisition net income from Acquired ROFO Assets	35
	Non-cash contributions	14
	Cash distributions, net of cash contributions	(51		)
	Balance as of June 30, 2014	$	264
	Distributions
	On January 30, 2014, NRG Yield LLC declared a distribution on its units of $0.33 per unit, which was paid on March 17, 2014. The portion of the distribution paid by NRG Yield LLC to NRG was recorded as a reduction to the Company's noncontrolling interest balance.
	On May 5, 2014, NRG Yield LLC declared a distribution on its Class B unit of $0.35 per share, which was paid to NRG, its Class B unitholder, on June 16, 2014. The distribution by NRG Yield LLC to NRG was recorded as a reduction to the Company's noncontrolling interest balance.
	On June 30, 2014, the Company acquired the TA High Desert, RE Kansas South, and El Segundo projects, as discussed in Note 3, Business Acquisitions. The difference between the cash paid and historical value of the entities' equity of $113 million was recorded as a distribution to NRG and reduced the balance of its noncontrolling interest. In addition, as the TA High Desert, RE Kansas South and El Segundo projects were owned by NRG until June 30, 2014, the pre-acquisition earnings of such projects are recorded as attributable to NRG's noncontrolling interest. Prior to the date of acquisition, El Segundo made a distribution to NRG of $24 million.
	Recent Accounting Developments
	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 International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 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 the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position.
	ASU 2013-11 - In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740) Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, or ASU No. 2013-11.  The amendments of ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction of a deferred tax asset for an NOL, a similar tax loss or tax credit carryforwards rather than a liability when the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and the entity intends to use the deferred tax asset for that purpose.  The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 with early adoption permitted. The Company adopted this standard effective January 1, 2014. The adoption of this standard did not impact the Company's results of operations or cash flows as the unrecognized tax benefits relate to state issues and the Company either has no NOLs or the NOLs are limited for that particular jurisdiction.

Business_Acquisition_Notes

Business Acquisition (Notes)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Business Acquisition	'
	Business Acquisitions
	2014 Acquisitions
	Alta Wind Portfolio Acquisition — On June 3, 2014, the Company and NRG Yield Operating LLC entered into a purchase and sale agreement with the Alta Sellers, whereby the Company agreed to acquire 100% of the membership interests of Alta Wind Asset Management Holdings, LLC, Alta Wind Company, LLC, Alta Wind X Holding Company, LLC and Alta Wind XI Holding Company, LLC, which collectively own 7 wind facilities that total 947 MW located in Tehachapi, California and a portfolio of associated land leases, or the Alta Wind Assets. The purchase price for the Alta Wind Assets is $870 million, as well as working capital adjustments, plus the assumption of $1.6 billion of non-recourse project-level debt. The purchase price is expected to be funded by the following components:
			(in millions)
	Issuance of corporate bonds		$	500
	Issuance of Class A common stock		370
	Total		$	870
	In order to fund the purchase price, the Company completed an equity offering of 12,075,000 shares of its Class A common stock at an offering price of $54.00 per share on July 29, 2014, which resulted in net proceeds of $630 million, after underwriting discount and expenses. In addition, on August 5, 2014, NRG Yield Operating LLC issued $500 million of senior unsecured notes, which bear interest at a rate of 5.375% and mature in August 2024. The acquisition of the Alta Wind Assets is subject to customary closing conditions, including the receipt of regulatory approvals. The Company expects the acquisition to close during the third quarter of 2014. The excess of the proceeds over the amount utilized for the acquisition will be available for general corporate purposes, including future acquisitions.
	Acquired ROFO Assets — On June 30, 2014, NRG Yield Operating LLC acquired the El Segundo, TA High Desert, and RE Kansas South projects for a total cash consideration of $357 million, which represents a base purchase price of $349 million and $8 million of working capital adjustments. In addition, the acquisition included the assumption of $612 million in project level debt. The assets and liabilities transferred to the Company relate to interests under common control by NRG and accordingly, were recorded at historical cost in accordance with ASC 805-50, Business Combinations - Related Issues. The difference between the cash proceeds and historical value of the net assets was recorded as a distribution to NRG and reduced the balance of its noncontrolling interest. Since the transaction constituted a transfer of net assets under common control, the guidance requires retrospective combination of the entities for all periods presented as if the combination has been in effect since the inception of common control.
	The following is a summary of assets and liabilities transferred in connection with the acquisition:
		RE Kansas South			TA High Desert		El Segundo
		(In millions)
	Current assets	$	1		$	3	$	43
	Property, plant and equipment	50			67		625
	Non-current assets	2			13		76
	Total assets	53			83		744
	Debt	35			57		520
	Other current and non-current liabilities	2			—		30
	Total liabilities	37			57		550
	Net assets acquired	$	16		$	26	$	194
	The following table presents historical information summary combining the financial information for the Acquired ROFO assets transferred in connection with the acquisition:
		December 31, 2013
		As Previously Reported			RE Kansas South		TA High Desert		El Segundo			As Currently Reported
					(In millions)
	Current assets	$	267		$	25	$	28	$	58		$	378
	Property, plant and equipment	1,541			51		63		636			2,291
	Non-current assets	505			3		10		51			569
	Total assets	2,313			79		101		745			3,238
	Debt	1,133			58		80		512			1,783
	Other current and non-current liabilities	169			5		3		26			203
	Total liabilities	$	1,302		$	63	$	83	$	538		$	1,986
		Three months ended June 30, 2013												Six months ended June 30, 2013
		As Previously Reported			RE Kansas South		TA High Desert		El Segundo			As Currently Reported		As Previously Reported		RE Kansas South		TA High Desert		El Segundo			As Currently Reported
							(In millions)
	Operating revenues	$	79		$	—	$	3	$	—		$	82	$	132	$	—	$	3	$	—		$	135
	Operating income	38			—		1		(1		)	38		50		—		1		(1		)	50
	Net income	$	34		$	1	$	—	$	—		$	35	$	45	$	1	$	—	$	—		$	46
	2013 Acquisitions
	Energy Systems — On December 31, 2013, NRG Energy Center Omaha Holdings, LLC, an indirect wholly owned subsidiary of NRG Yield LLC, acquired Energy Systems Company, or Energy Systems, for approximately $120 million. The acquisition was financed from cash on hand. Energy Systems is an operator of steam and chilled water thermal facilities that provides heating and cooling services to nonresidential customers in Omaha, Nebraska. The acquisition was recorded as a business combination under ASC 805, with identifiable assets acquired and liabilities assumed provisionally recorded at their estimated fair values on the acquisition date. The purchase price was primarily allocated to property, plant and equipment of $60 million, customer relationships of $59 million, and $1 million of working capital. The initial accounting for the business combination is not complete because the evaluations necessary to assess the fair values of certain net assets acquired are still in process. The provisional amounts are subject to revision until the evaluations are completed to the extent that additional information is obtained about the facts and circumstances that existed as of the acquisition date.

Property_Plant_and_Equipment_N

Property, Plant and Equipment (Notes)	6 Months Ended
	Jun. 30, 2014
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment Disclosure	'
	Property, Plant and Equipment
	The Company’s major classes of property, plant, and equipment were as follows:
		June 30, 2014			31-Dec-13			Depreciable Lives
		(In millions)
	Facilities and equipment	$	2,429		$	2,411		5 - 40 Years
	Land and improvements	48			48
	Construction in progress	11			6
	Total property, plant and equipment	2,488			2,465
	Accumulated depreciation	(233		)	(174		)
	Net property, plant and equipment	$	2,255		$	2,291
	Renewable Energy Grants
	Borrego achieved commercial operations on February 12, 2013 and transferred the construction in progress to property, plant and equipment. On May 16, 2013, the Borrego solar project, as a qualified renewable energy project, applied for a cash grant in lieu of investment tax credit from the U.S. Treasury Department in the amount of $39 million. A receivable for the cash grant was recorded when the application was filed, which resulted in a reduction to the book basis of the property, plant and equipment. In addition, the receivable was reduced to $36 million as a result of the federal government’s sequestration, which was put into effect on March 1, 2013. The related deferred tax asset of $10 million recognizable was recorded with a corresponding reduction of the book value of Borrego’s property plant and equipment. In March 2014, the Company received payment of $30 million for the cash grant related to Borrego. The Company recorded a reserve for the shortage and is in the process of evaluating all of its options for recovering the full amount of the reserve.
	TA High Desert achieved commercial operations on March 25, 2013 and transferred the construction in progress to property, plant and equipment. On May 22, 2013, the TA High Desert solar project, as a qualified renewable energy project, applied for a cash grant in lieu of investment tax credit from the U.S. Treasury Department in the amount of $25 million. A receivable for the cash grant was recorded when the application was filed, which resulted in a reduction to the book basis of the property, plant and equipment. In addition, the receivable was reduced as a result of the federal government’s sequestration, which was put into effect on March 1, 2013. The related deferred tax asset of $6 million was recorded with a corresponding reduction of the book value of TA High Desert's property plant and equipment. In April 2014, TA High Desert received a payment of $20 million for the cash grant and reduced the book value of its property plant and equipment by the amount by which the grant was reduced.
	RE Kansas South achieved commercial operations on June 7, 2013 and transferred the construction in progress to property, plant and equipment. On June 27, 2013, the RE Kansas South solar project, as a qualified renewable energy project, applied for a cash grant in lieu of investment tax credit from the U.S. Treasury Department in the amount of $23 million. A receivable for the cash grant was recorded when the application was filed, which resulted in a reduction to the book basis of the property, plant and equipment. In addition, the receivable was reduced to $21 million as a result of the federal government’s sequestration, which was put into effect on March 1, 2013. The related deferred tax asset of $6 million recognizable was recorded with a corresponding reduction of the book value of RE Kansas South's property plant and equipment. In April 2014, RE Kansas South received a payment of $21 million for the cash grant.

Variable_Interest_Entities_or_

Variable Interest Entities, or VIEs (Notes)	6 Months Ended
	Jun. 30, 2014
Variable Interest Entities Disclosure [Abstract]	'
Variable Interest Entity	'
	Variable Interest Entities, or VIEs
	GenConn Energy LLC — The Company has a 49.95% interest in GCE Holdings LLC, the owner of GenConn Energy LLC, or GenConn, a limited liability company formed to construct, own and operate two 190 MW peaking generation facilities in Connecticut at the Devon and Middletown sites. Each of these facilities was constructed pursuant to a 30-year cost of service type contract with the Connecticut Light & Power Company. All four units at the GenConn Devon facility reached commercial operation in June 2010 and were released to the ISO-NE by July 2010. In June 2011, all four units at the GenConn Middletown facility reached commercial operation and were released to the ISO-NE. GenConn is considered a VIE under ASC 810, however the Company is not the primary beneficiary, and accounts for its investment under the equity method.
	The project was funded through equity contributions from the owners and non-recourse, project level debt. As of June 30, 2014, the Company's investment in GenConn was $116 million and its maximum exposure to loss is limited to its equity investment. On September 17, 2013, GenConn refinanced its existing project financing facility. As of June 30, 2014, the refinanced facility has a $237 million note with an interest rate of 4.73% per annum and a maturity date of July 2041 and a $35 million working capital facility that matures in 2018 which can be used to issue letters of credit at an interest rate of 1.875% per annum. The refinancing is secured by all of the GenConn assets.
	The following table presents summarized unaudited financial information for GCE Holdings LLC:
		Three months ended June 30,				Six months ended June 30,
		2014		2013		2014		2013
	Income Statement Data:	(In millions)
	Operating revenues	$	18	$	19	$	44	$	39
	Operating income	10		12		20		23
	Net income	7		7		14		15
		June 30, 2014		December 31, 2013
	Balance Sheet Data:	(In millions)
	Current assets	$	31	$	32
	Non-current assets	446		453
	Current liabilities	16		18
	Non-current liabilities	228		231

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments (Notes)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	For cash and cash equivalents, restricted cash, accounts receivable — trade, accounts payable, affiliate accounts payable and receivable, accrued expenses and other liabilities, the carrying amount approximates 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 June 30, 2014								As of December 31, 2013
		Carrying Amount				Fair Value				Carrying Amount		Fair Value
		(In millions)
	Assets:
	Notes receivable — affiliate	$	—			$	—			$	2	$	2
	Notes receivable, including current portion	23				23				27		27
	Liabilities:
	Long-term debt, including current portion	1,999				2,087				1,783		1,785
	The fair value of notes receivable and long-term debt are based on expected future cash flows discounted at market interest rates, or current interest rates for similar instruments and are classified as Level 3 within the fair value hierarchy.
	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.
	Recurring Fair Value Measurements
	The Company records its derivative assets and liabilities at fair market value on its consolidated balance sheet. The following table presents assets and liabilities measured and recorded at fair value on the Company's consolidated balance sheets on a recurring basis and their level within the fair value hierarchy:
		As of June 30, 2014
		Fair Value (a)
	(In millions)	Level 2				Level 3				Total
	Derivative assets:
	Commodity contracts	$	1			$	—			$	1
	Interest rate contracts	5				—				5
	Total assets	6				—				6
	Derivative liabilities:
	Commodity contracts	1				1				2
	Interest rate contracts	52				—				52
	Total liabilities	$	53			$	1			$	54
	(a) There were no assets or liabilities classified as Level 1 as of June 30, 2014.
		As of December 31, 2013
		Fair Value (a)
	(In millions)	Level 2				Level 3				Total
	Derivative assets:
	Commodity contracts	$	1			$	—			$	1
	Interest rate contracts	20				—				20
	Total assets	21				—				21
	Derivative liabilities:
	Commodity contracts	1				1				2
	Interest rate contracts	45				—				45
	Total liabilities	$	46			$	1			$	47
	(a) There were no assets or liabilities classified as Level 1 as of December 31, 2013.
	The following table reconciles, for the three and six months ended June 30, 2014, the beginning and ending balances for derivative instruments that are recognized at fair value in the consolidated financial statements, at least annually, using significant unobservable inputs:
			Fair Value Measurement Using Significant Unobservable Inputs - Derivatives (Level 3)
			Three months ended June 30,				Six months ended June 30,
	(In millions)		2014				2014
	Beginning balance		$	(1	)		$	(1	)
	Purchases		—				—
	Ending balance as of June 30, 2014		$	(1	)		$	(1	)
	Derivative Fair Value Measurements
	A majority of 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 remainder of the assets and liabilities represent contracts for which external sources or observable market quotes are not available. These contracts are valued using various valuation techniques including but not limited to internal models that apply fundamental analysis of the market and corroboration with similar markets. As of June 30, 2014, contracts valued with prices provided by models and other valuation techniques make up 0% of the total derivative assets and 2% of the total derivative liabilities.
	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 calculated based on credit default swaps. To the extent that the net exposure is an asset, the Company uses the counterparty’s default swap rate. If the exposure is a liability, the Company uses its default swap rate. 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. 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
	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) a 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. The Company also has credit protection within various agreements to call on additional collateral support if and when necessary. Cash margin is collected and held at the Company to cover the credit risk of the counterparty until positions settle.
	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 June 30, 2014, credit risk exposure to these counterparties attributable to the Company's ownership interests was approximately $1.1 billion for the next five years. The majority of these power contracts are with utilities with strong credit quality and public utility commission or other regulatory support. However, such regulated utility counterparties can be impacted by changes in government regulations, which the Company is unable to predict.

Accounting_for_Derivative_Inst

Accounting for Derivative Instruments and Hedging Activities (Notes)	6 Months Ended
	Jun. 30, 2014
Accounting for Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Accounting for Derivative Instruments and Hedging Activities	'
	Accounting for Derivative Instruments and Hedging Activities
	Energy-Related Commodities
	As of June 30, 2014, 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 2017. At June 30, 2014, these contracts were not designated as cash flow or fair value hedges.
	Interest Rate Swaps
	As of June 30, 2014, the Company had interest rate derivative instruments on project-level debt extending through 2030, the majority 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 as of June 30, 2014 and December 31, 2013.
			Total Volume
			June 30, 2014			December 31, 2013
	Commodity	Units	(In millions)
	Natural Gas	MMBtu	2			2
	Interest	Dollars	$	1,215		$	1,234
	Fair Value of Derivative Instruments
	The following table summarizes the fair value within the derivative instrument valuation on the balance sheet:
		Fair Value
		Derivative Assets						Derivative Liabilities
		June 30, 2014			December 31, 2013			June 30, 2014			December 31, 2013
		(In millions)
	Derivatives Designated as Cash Flow Hedges:
	Interest rate contracts current	$	—		$	—		$	26		$	26
	Interest rate contracts long-term	4			14			22			16
	Total Derivatives Designated as Cash Flow Hedges	4			14			48			42
	Derivatives Not Designated as Cash Flow Hedges:
	Interest rate contracts current	—			—			3			3
	Interest rate contracts long-term	1			6			1			—
	Commodity contracts current	1			1			1			2
	Commodity contracts long-term	—			—			1			—
	Total Derivatives Not Designated as Cash Flow Hedges	2			7			6			5
	Total Derivatives	$	6		$	21		$	54		$	47
	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 June 30, 2014 and December 31, 2013, there was no outstanding collateral paid or received. The following table summarizes the offsetting of derivatives by counterparty master agreement level:
		Gross Amounts Not Offset in the Statement of Financial Position
		Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
	As of June 30, 2014	(In millions)
	Commodity contracts:
	Derivative assets	$	1		$	—		$	1
	Derivative liabilities	(2		)	—			(2		)
	Total commodity contracts	(1		)	—			(1		)
	Interest rate contracts:
	Derivative assets	5			(3		)	2
	Derivative liabilities	(52		)	3			(49		)
	Total interest rate contracts	(47		)	—			(47		)
	Total derivative instruments	$	(48	)	$	—		$	(48	)
		Gross Amounts Not Offset in the Statement of Financial Position
	As of December 31, 2013	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
	Commodity contracts:	(In millions)
	Derivative assets	$	1		$	—		$	1
	Derivative liabilities	(2		)	—			(2		)
	Total commodity contracts	(1		)	—			(1		)
	Interest rate contracts:
	Derivative assets	20			(12		)	8
	Derivative liabilities	(45		)	12			(33		)
	Total interest rate contracts	(25		)	—			(25		)
	Total derivative instruments	$	(26	)	$	—		$	(26	)
	Accumulated Other Comprehensive Loss
	The following table summarizes the effects on the Company’s accumulated other comprehensive loss, or OCL, balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax:
		Three months ended June 30,						Six months ended June 30,
		2014			2013			2014			2013
		(In millions)						(In millions)
	Accumulated OCL beginning balance, net of tax	$	(12	)	$	(34	)	$	—		$	(38	)
	Reclassified from accumulated OCL to income due to realization of previously deferred amounts	4			3			7			5
	Mark-to-market of cash flow hedge accounting contracts	(16		)	22			(31		)	24
	Accumulated OCL ending balance, net of income tax benefit of $1 and $3, respectively	(24		)	(9		)	(24		)	(9		)
	Accumulated OCL attributable to noncontrolling interest	(15		)				(15		)
Accumulated OCL attributable to NRG Yield, Inc.	$	(9	)				$	(9	)
A loss of $15 million is expected to be realized from OCL during the next 12 months, net of $0 million tax.
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.
Impact of Derivative Instruments on the Statements of Operations
The Company has interest rate derivative instruments that are not designated as cash flow hedges as well as ineffectiveness on cash flow hedge derivatives. For the three months ended June 30, 2014 and 2013, the impact to the consolidated statements of operations was a loss of $3 million and a gain of $6 million, respectively. For the six months ended June 30, 2014 and 2013, the impact to the consolidated statements of operations was a loss of $6 million and a gain of $9 million, respectively.
The Company’s derivative commodity contracts relate 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 statement of operations for these contracts.
See Note 6, Fair Value of Financial Instruments, for discussion regarding concentration of credit risk.

Longterm_Debt_Notes

Long-term Debt (Notes)	6 Months Ended
	Jun. 30, 2014
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 2013 Form 10-K. Long-term debt consisted of the following:
		June 30, 2014		December 31, 2013		Current interest rate % (a)
		(In millions, except rates)
	Convertible Senior Notes, due 2019 (b)	$	324	$	—	3.5
	Project-level debt:
	NRG West Holdings LLC, due 2023	520		512		L+2.50/L+2.875
	NRG Marsh Landing LLC, due 2017 and 2023	464		473		L+ 2.75/L+3.00
	NRG Solar Alpine LLC, due 2022	170		221		L+2.5/L+1.75
	NRG Energy Center Minneapolis LLC, senior secured notes, due 2017 and 2025	124		127		5.95/7.25
	NRG Solar Borrego LLC, due 2024 and 2038	77		78		L+ 2.50/5.65
	South Trent Wind LLC, due 2020	66		69		L+ 2.625/L+2.75
	NRG Solar Avra Valley LLC, due 2031	62		63		L+ 2.25
	TA High Desert LLC, due 2023 and 2033	57		80		L+2.50/5.15
	NRG Roadrunner LLC, due 2031	43		44		L+ 2.01
	NRG Solar Kansas South LLC, due 2031	35		58		L+2.625
	NRG Solar Blythe LLC, due 2028	24		24		L+ 2.75
	PFMG and related subsidiaries financing agreement, due 2030	31		32		6
	NRG Energy Center Princeton LLC, due 2017	2		2		5.95
	Subtotal project-level debt:	1,675		1,783
	Total debt	1,999		1,783
	Less current maturities	119		214
	Total long-term debt	$	1,880	$	1,569
	(a) As of June 30, 2014, L+ equals 3 month LIBOR plus x%, except for Kansas South where L+ equals 6 month LIBOR plus x% .
	(b) Net of discount of $21 million as of June 30, 2014.
	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 arrangement. As of June 30, 2014, the Company was in compliance with all of the required covenants.
	NRG Yield, Inc. Convertible Notes
	During the first quarter of 2014, the Company closed on its offering of $345 million aggregate principal amount of 3.50% Convertible Notes due 2019, or the Convertible Notes.  The Convertible Notes are convertible, under certain circumstances, into the Company’s Class A common stock, cash or a combination thereof at an initial conversion price of $46.55 per Class A common share, which is equivalent to an initial conversion rate of approximately 21.4822 shares of Class A common stock per $1,000 principal amount of Convertible Notes. Interest on the Convertible Notes is payable semi-annually in arrears on February 1 and August 1 of each year, commencing on August 1, 2014. The Convertible Notes mature on February 1, 2019, unless earlier repurchased or converted in accordance with their terms. Prior to the close of business on the business day immediately preceding August 1, 2018, the Convertible Notes will be convertible only upon the occurrence of certain events and during certain periods, and thereafter, at any time until the close of business on the second scheduled trading day immediately preceding the maturity date.
	The convertible notes are accounted for in accordance with ASC 470-20. Under ASC 470-20, issuers of convertible debt instruments that may be settled in cash upon conversion, including partial cash settlement, are required to separately account for the liability (debt) and equity (conversion option) components. The application of ACS 470-20 resulted in the recognition of $23 million as the value for the equity component with the offset to debt discount. The debt discount will be amortized to interest expense using the effective interest method over the term of the Convertible Notes.
	NRG Yield Operating LLC Senior Notes
	On August 5, 2014, NRG Yield Operating LLC issued $500 million of senior unsecured notes, or the Senior Notes. The Senior Notes bear interest at 5.375% and mature in 2024.
	NRG Yield LLC and NRG Yield Operating LLC Revolving Credit Facility
	In connection with the Company's initial public offering of Class A common stock in July 2013, as further described in Note 1, Nature of Business, NRG Yield LLC and NRG Yield Operating LLC entered into a senior secured revolving credit facility, which provided a revolving line of credit of $60 million. On April 25, 2014, NRG Yield LLC and NRG Yield Operating LLC amended the revolving credit facility to increase the available line of credit to $450 million and extend its maturity to April 2019. The revolving credit facility can be used for cash or for the issuance of letters of credit. There was no cash drawn or letters of credit issued under the revolving credit facility as of June 30, 2014.
	Project - level Debt
	NRG West Holdings Credit Agreement
	On August 23, 2011, NRG West Holdings LLC, or West Holdings, entered into a credit agreement with a group of lenders in respect to the El Segundo project, or the West Holdings Credit Agreement. The West Holdings Credit Agreement, is comprised of a $540 million two tranche construction loan facility with additional facilities for the issuance of letters of credit or working capital loans, and is secured by the assets of West Holdings.
	The two tranche construction loan facility consists of the $480 million Tranche A Construction Facility, or the Tranche A Facility, and the $60 million Tranche B Construction Facility, or the Tranche B Facility. The Tranche A and Tranche B Facilities, which mature in August 2023, convert to a term loan and have an interest rate of 3-month LIBOR, plus an applicable margin which (i) increases by 0.125% periodically from conversion through year eight for the Tranche A Facility, and (ii) increases by (A) 0.125% upon term conversion and on the third and sixth anniversary of the term conversion and (B) by 0.025% on the eighth anniversary of the term conversion for the Tranche B Facility. The Tranche A and Tranche B Facilities amortize based upon a predetermined schedule over the term of the loan with the balance payable at maturity. The construction loan converted to a term loan on January 28, 2014.
	The West Holdings Credit Agreement also provides for the issuance of letters of credit and working capital loans to support the El Segundo's collateral needs. This includes letter of credit facilities on behalf of West Holdings of up to $90 million in support of the PPA, up to $48 million in support of the collateral agent, and a working capital facility which permits loans or the issuance of letters of credit of up to $10 million.
	As of June 30, 2014, under the West Holdings Credit Agreement, West Holdings has outstanding $460 million under the Tranche A Facility, $60 million under the Tranche B Facility, issued a $33 million letter of credit in support of the PPA, a $48 million letter in support of debt service and a $1 million letter of credit under the working capital facility.
	Alpine Financing
	On March 16, 2012, NRG Solar Alpine LLC, or Alpine, entered into a credit agreement with a group of lenders for a $166 million construction loan that was convertible to a term loan upon completion of the project and a $68 million cash grant loan. On January 15, 2013, the credit agreement was amended, reducing the cash grant loan to $63 million. On March 26, 2013, Alpine met the conditions under the credit agreement to convert the construction loan to a term loan. Immediately prior to the conversion, the Company drew an additional $164 million under the construction loan and $62 million under the cash grant loan. The term loan amortizes on a predetermined schedule with final maturity in November 2022.
	In January 2014, Alpine repaid the $62 million of outstanding cash grant loan, including accrued interest and breakage fees, with the proceeds that it had received from the U.S. Treasury Department, as further described in in Note 4, Property, Plant and Equipment. On June 24, 2014, Alpine amended the credit agreement to increase its term loan borrowings by an additional $13 million and to reduce the related interest rate to 3 month LIBOR plus 1.75% through June 30, 2019 and 3 month LIBOR plus 2.00% through November 2022. The proceeds were utilized to make a distribution of $11 million to NRG Yield Operating LLC with the remaining $2 million utilized to fund the costs of the amendment.
	TA High Desert Facility
	The TA High Desert Facility is comprised of $53 million of fixed rate notes due 2033 at an interest rate of 5.15%, $7 million of floating rate notes due 2023, $22 million of bridge notes due the earlier of ten days after receipt of the cash grant or May 2014, and a revolving facility of $12 million. The floating rate notes have an interest rate of 3 month LIBOR plus 2.5% with LIBOR floor of 1.5%, while the bridge notes have an interest rate of 1 month LIBOR plus 2.50%. As described in Note 4, Property, Plant and Equipment, in April 2014, TA High Desert received payment of $20 million for its cash grant and utilized the proceeds, along with an additional $2 million of cash contributed by NRG to repay the cash grant bridge loan. The revolving facility can be used for cash or for the issuance of up to $9 million in letters of credit. As of June 30, 2014, $57 million of notes were outstanding and $8 million of letters of credit were outstanding under the revolving facility.  The notes amortize on predetermined schedules and are secured by all of the assets of TA High Desert.
	RE Kansas South Facility
	The RE Kansas South Facility includes a $38 million term loan due 2031 and a $21 million cash grant bridge loan due ten days after receipt of the cash grant. The term loan has an interest rate of 6 month LIBOR plus an applicable margin of 2.625% and increases by 0.25% every 4 years. The cash grant bridge loan had an interest rate of 1 month LIBOR plus an applicable margin of 2.00%. The term loan amortizes on a predetermined schedule and is secured by all of the assets of RE Kansas South. As described in Note 4, Property, Plant and Equipment, in April 2014, the Company received payment of $21 million for the cash grant related to RE Kansas South and utilized the proceeds to repay the cash grant bridge loan. As of June 30, 2014, $35 million was outstanding under the term loan and $4 million of letters of credit were issued under the RE Kansas South Facility.
	Additional Project-level Debt Amendments
	On July 9, 2014, Avra Valley amended its credit agreement to increase its borrowings by $3 million and to reduce the related interest rate from 3 month LIBOR plus an applicable margin of 2.25% to 3 month LIBOR plus 1.75%. The proceeds were primarily utilized to make a distribution to NRG Yield Operating LLC.
	On July 17, 2014, Marsh Landing amended its credit agreement to increase its borrowings by $34 million and to reduce the related interest rate for the Tranche A borrowings from 3 month LIBOR plus an applicable margin of 2.75% to 3 month LIBOR plus 1.75% through December 2017 and to 3 month LIBOR plus 2.00% thereafter; and for the Tranche B to reduce the related interest rate from 3 month LIBOR plus 3.00% to 3 month LIBOR plus 1.875% through December 2017 and to 3 month LIBOR plus 2.125% thereafter. The proceeds from the borrowings were utilized to make a distribution of $29 million to NRG Yield Operating LLC and to fund the costs of the amendment.

Earnings_Per_Share_Notes

Earnings Per Share (Notes)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	Basic and diluted earnings per Class A common share are computed by dividing net income by the weighted average number of Class A common shares outstanding. Shares issued during the year are weighted for the portion of the year that they were outstanding.
	The reconciliation of the Company's basic and diluted earnings per share is shown in the following table:
		Three months ended June 30,		Six months ended June 30,
		2014		2014
	(In millions, except per share data)
	Basic and diluted earnings per share attributable to Class A common stockholders
	Net Income Attributable to NRG Yield, Inc.	$	6	$	10
	Weighted average number of Class A common shares outstanding	23		23
	Basic and Diluted Earnings per Class A common share:	$	0.26	$	0.42
	There was a total of 7 million shares of Class A common stock that were anti-dilutive as of June 30, 2014.

Changes_in_Capital_Structure

Changes in Capital Structure	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Changes in Capital Structure	'
	Changes in Capital Structure
	As of June 30, 2014 and December 31, 2013, the Company had 22,511,250 shares of Class A common stock outstanding.
	The following table lists the dividends paid on the Company's Class A common stock during the six months ended June 30, 2014:
		Second Quarter 2014		First Quarter 2014
	Dividends per share	$	0.35	$	0.33
	The Company's Class A common stock dividends are subject to available capital, market conditions, and compliance with associated laws and regulations.
	On July 29, 2014, the Company declared a quarterly dividend on Class A common stock of $0.365 per share payable on September 15, 2014 to shareholders of record as of September 2, 2014.
	On July 29, 2014, the Company issued 12,075,000 Class A common shares for net proceeds, after underwriting discount and expenses, of $630 million. The proceeds are expected to be used to fund the acquisition of the Alta Wind Assets with the excess of the proceeds over the amount utilized for the acquisition available for general corporate purposes, including future acquisitions.

Segment_Reporting_Notes

Segment Reporting (Notes)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Segment Reporting	'
	— Segment Reporting
	The Company’s segment structure reflects how management currently makes financial decisions and allocates resources. Its 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.
		Three months ended June 30, 2014
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	61		$	30		$	43		$	—		$	134
	Cost of operations	12			3			30			—			45
	Depreciation and amortization	24			7			5			—			36
	General and administrative — affiliate	—			—			—			2			2
	Operating income/(loss)	25			20			8			(2		)	51
	Equity in earnings of unconsolidated affiliates	4			10			—			—			14
	Interest expense	(11		)	(11		)	(2		)	(5		)	(29		)
	Income/(loss) before income taxes	18			19			6			(7		)	36
	Net income/(loss)	18			19			6			(9		)	34
	Total assets	$	1,535		$	905		$	362		$	434		$	3,236
		Three months ended June 30, 2013
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	20		$	26		$	36		$	—		$	82
	Cost of operations	3			2			27			—			32
	Depreciation and amortization	2			5			3			—			10
	General and administrative — affiliate	—			—			—			2			2
	Operating income/(loss)	15			19			6			(2		)	38
	Equity in earnings of unconsolidated affiliates	3			(1		)	—			—			2
	Interest expense	(3		)	(1		)	(2		)	—			(6		)
	Other income, net	1			—			—			—			1
	Income/(loss) before income taxes	16			17			4			(2		)	35
	Net income/(loss)	$	16		$	17		$	4		$	(2	)	$	35
		Six months ended June 30, 2014
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	117		$	49		$	108		$	—		$	274
	Cost of operations	22			7			76			—			105
	Depreciation and amortization	36			15			9			—			60
	General and administrative — affiliate	—			—			—			4			4
	Operating income/(loss)	59			27			23			(4		)	105
	Equity in earnings of unconsolidated affiliates	7			8			—			—			15
	Interest expense	(22		)	(22		)	(4		)	(8		)	(56		)
	Other income	—			1			—			—			1
	Income/(loss) before income taxes	44			14			19			(12		)	65
	Net income/(loss)	$	44		$	14		$	19		$	(17	)	$	60
		Six months ended June 30, 2013
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	20		$	42		$	73		$	—		$	135
	Cost of operations	3			5			53			—			61
	Depreciation and amortization	2			11			7			—			20
	General and administrative — affiliate	—			—			—			4			4
	Operating income/(loss)	15			26			13			(4		)	50
	Equity in earnings of unconsolidated affiliates	7			(1		)	—			—			6
	Interest expense	(3		)	(4		)	(4		)	—			(11		)
	Other income, net	1			—			—			—			1
	Income/(loss) before income taxes	20			21			9			(4		)	46
	Net income/(loss)	$	20		$	21		$	9		$	(4	)	$	46

Income_Taxes_Notes

Income Taxes (Notes)	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Income Taxes	'
	Income Taxes
	Effective Tax Rate
	The income tax provision consisted of the following:
		Three months ended June 30,						Six months ended June 30,
	(In millions, except otherwise noted)	2014			2013			2014			2013
	Income before income taxes	$	36		$	35		$	65		$	46
	Income tax expense	2			—			5			—
	Effective tax rate	5.6		%	—		%	7.7		%	—		%
	For the three and six months ended June 30, 2014 and 2013, the overall effective tax rate was different than the statutory rate of 35% primarily due to taxable earnings allocated to NRG resulting from its 65.5% interest in NRG Yield LLC.
	On July 22, 2013, the Company acquired a controlling interest in NRG Yield LLC and its subsidiary NRG Yield Operating LLC. As a result, the Company owns 34.5% of NRG Yield LLC and consolidates the results due to its controlling interest. The Company records NRG's 65.5% ownership as noncontrolling interest in the financial statements. NRG Yield LLC is treated as a partnership for income tax purposes. As such, the Company records income tax on its 34.5% of NRG Yield LLC's taxable income. NRG records income tax on its 65.5% share of taxable income generated by NRG Yield LLC.
	The Company's deferred tax balances reflect the change in tax basis of the Company's assets as a result of the initial public offering and ROFO acquisitions, primarily due to an increase in the tax basis of the Company's property, plant and equipment. The change in tax basis resulted in a non-cash addition of $171 million as of June 30, 2014 and $153 million as of December 31, 2013 to the Company's additional paid-in capital.

Related_Party_Transactions_Not

Related Party Transactions (Notes)	6 Months Ended
	Jun. 30, 2014
Related Party Transactions [Abstract]	'
Related Party Transactions Disclosure	'
	Related Party Transactions
	Management Services Agreement with NRG
	Subsequent to the initial public offering, 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 June 30, 2014, the base management fee was approximately $1 million per quarter 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. The fee was increased by approximately $0.5 million per year in connection with the acquisition of the Acquired ROFO Assets. Costs incurred under this agreement were approximately $4 million for the six months ending June 30, 2014, which included certain direct expenses incurred by NRG on behalf of the Company in addition to the base management fee.
	Accounts Payable to NRG Solar LLC
	During the third quarter of 2013, NRG Solar LLC, a wholly-owned subsidiary of NRG, made 100% of the required capital contributions to CVSR, including the Company's 48.95% portion, of which $14 million was outstanding as of December 31, 2013. This balance was repaid to NRG Solar LLC during the quarter ended March 31, 2014.
	Accounts Payable to NRG Repowering Holdings LLC
	During 2013, NRG Repowering Holdings, LLC, a wholly-owned subsidiary of NRG, made payments to BA Leasing BSC, LLC, or BA Leasing, of $18 million, which were expected to be repaid with the proceeds of the cash grant received by BA leasing with respect to the PFMG DG Solar Projects, a wholly-owned subsidiary of the Company, in connection with a sale-leaseback arrangement between the PFMG DG Solar Projects and BA Leasing. As of December 31, 2013, PFMG DG Solar Projects had a corresponding receivable for the reimbursement of the cash grant from BA Leasing and related payable to NRG Repowering Holdings, LLC. In the first quarter of 2014, the PFMG DG Solar Projects received $11 million from BA Leasing and reduced the remaining receivable with an offset to the deferred liability recorded in connection with the sale - leaseback arrangement. The PFMG DG Solar Projects utilized the $11 million to repay NRG Repowering Holdings LLC.

Environmental_Matters_Notes

Environmental Matters (Notes)	6 Months Ended
	Jun. 30, 2014
Environmental Remediation Obligations [Abstract]	'
Environmental Matters	'
	Environmental Matters
	In 2013, NRG Energy Center San Francisco LLC, a wholly owned indirect subsidiary of the Company, received a notice of violation from the San Francisco Department of Public Health alleging improper monitoring of three underground storage tanks. The tanks have not leaked. The Company settled the matter in July 2014 for $123,000.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Use of Estimates, Policy [Policy Text Block]	'
	Use of Estimates
	The preparation of consolidated financial statements in accordance with U.S. GAAP requires management to make estimates and assumptions. These estimates and assumptions impact the reported amount of assets and liabilities and disclosures of contingent assets and liabilities as of the date of the consolidated financial statements. They also impact the reported amount of net earnings during the reporting period. Actual results could be different from these estimates.
Noncontrolling Interest Disclosure [Text Block]	'
	Noncontrolling Interest
	The following table reflects the changes in the Company's noncontrolling interest balance:
		(In millions)
	Balance as of December 31, 2013 (As previously reported)	$	382
	Net Assets of Acquired ROFO Assets as of December 31, 2013	241
	Balance as of December 31, 2013 (As currently reported)	623
	Payment to NRG for Acquired ROFO assets	(357		)
	Comprehensive income, including pre-acquisition net income from Acquired ROFO Assets	35
	Non-cash contributions	14
	Cash distributions, net of cash contributions	(51		)
	Balance as of June 30, 2014	$	264
Cash Flow, Supplemental Disclosures [Text Block]	'
	Distributions
	On January 30, 2014, NRG Yield LLC declared a distribution on its units of $0.33 per unit, which was paid on March 17, 2014. The portion of the distribution paid by NRG Yield LLC to NRG was recorded as a reduction to the Company's noncontrolling interest balance.
	On May 5, 2014, NRG Yield LLC declared a distribution on its Class B unit of $0.35 per share, which was paid to NRG, its Class B unitholder, on June 16, 2014. The distribution by NRG Yield LLC to NRG was recorded as a reduction to the Company's noncontrolling interest balance.
	On June 30, 2014, the Company acquired the TA High Desert, RE Kansas South, and El Segundo projects, as discussed in Note 3, Business Acquisitions. The difference between the cash paid and historical value of the entities' equity of $113 million was recorded as a distribution to NRG and reduced the balance of its noncontrolling interest. In addition, as the TA High Desert, RE Kansas South and El Segundo projects were owned by NRG until June 30, 2014, the pre-acquisition earnings of such projects are recorded as attributable to NRG's noncontrolling interest. Prior to the date of acquisition, El Segundo made a distribution to NRG of $24 million.
New Accounting Pronouncements, Policy [Policy Text Block]	'
	Recent Accounting Developments
	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 International Accounting Standards Board, or IASB, to develop a common revenue standard for U.S. GAAP and International Financial Reporting Standards, or IFRS, and to improve financial reporting. The guidance in ASU No. 2014-09 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 the following steps to be applied by an entity: (1) identify the contract with a customer; (2) identify the performance obligations in the contract; (3) determine the transaction price; (4) allocate the transaction price to the performance obligations in the contract; and (5) recognize revenue when (or as) the entity satisfies the performance obligation. The guidance of ASU No. 2014-09 is effective for annual reporting periods beginning after December 15, 2016, including interim periods therein. Early adoption is not permitted. The Company is currently evaluating the impact of the standard on the Company's results of operations, cash flows and financial position.
	ASU 2013-11 - In July 2013, the FASB issued ASU No. 2013-11, Income Taxes (Topic 740) Presentation of an Unrecognized Tax Benefit When a Net Operating Loss Carryforward, a Similar Tax Loss, or a Tax Credit Carryforward Exists, or ASU No. 2013-11.  The amendments of ASU 2013-11 requires an entity to present an unrecognized tax benefit, or a portion of an unrecognized tax benefit, as a reduction of a deferred tax asset for an NOL, a similar tax loss or tax credit carryforwards rather than a liability when the uncertain tax position would reduce the NOL or other carryforward under the tax law of the applicable jurisdiction and the entity intends to use the deferred tax asset for that purpose.  The guidance is effective for fiscal years, and interim periods within those years, beginning after December 15, 2013 with early adoption permitted. The Company adopted this standard effective January 1, 2014. The adoption of this standard did not impact the Company's results of operations or cash flows as the unrecognized tax benefits relate to state issues and the Company either has no NOLs or the NOLs are limited for that particular jurisdiction.

Segment_Reporting_Segment_Repo

Segment Reporting Segment Reporting, Policy (Policies)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Segment Reporting, Policy	'
	The Company’s segment structure reflects how management currently makes financial decisions and allocates resources. Its 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.

Nature_of_Business_Nature_of_B

Nature of Business Nature of Business (Tables)	6 Months Ended
	Jun. 30, 2014
Nature of Business Disclosure [Abstract]	'
IPO of NRG Yield	'
	The following table represents the structure of the Company as of June 30, 2014:
	On July 29, 2014, the Company issued 12,075,000 shares of Class A common stock for net proceeds, after underwriting discount and expenses, of $630 million. The Company utilized the proceeds of the offering to acquire 12,075,000 additional Class A units of NRG Yield LLC and, as a result, it currently owns 44.7% of NRG Yield LLC, with NRG retaining 55.3% of NRG Yield LLC.
	F
The Company's operating assets are comprised of the following projects:	'
	the Company's operating assets are comprised of the following projects:
	Projects	Percentage Ownership		Net Capacity (MW) (a)	Offtake Counterparty	Expiration
	Conventional
	GenConn Middletown	49.95	%	95	Connecticut Light & Power	2041
	GenConn Devon	49.95	%	95	Connecticut Light & Power	2040
	Marsh Landing	100	%	720	Pacific Gas and Electric	2023
	El Segundo	100	%	550	Southern California Edison	2023
				1,460
	Utility-Scale Solar
	Alpine	100	%	66	Pacific Gas and Electric	2033
	Avenal	49.95	%	23	Pacific Gas and Electric	2031
	Avra Valley	100	%	25	Tucson Electric Power	2032
	Blythe	100	%	21	Southern California Edison	2029
	Borrego	100	%	26	San Diego Gas and Electric	2038
	CVSR	48.95	%	122	Pacific Gas and Electric	2038
	Roadrunner	100	%	20	El Paso Electric	2031
	RE Kansas South	100	%	20	Pacific Gas and Electric	2033
	TA High Desert	100	%	20	Southern California Edison	2033
				343
	Distributed Solar
	AZ DG Solar Projects	100	%	5	Various	2025 - 2033
	PFMG DG Solar Projects	51	%	5	Various	2032
				10
	Wind
	South Trent	100	%	101	AEP Energy Partners	2029
	Thermal
	Thermal equivalent MWt(b)	100	%	1,346	Various	Various
	Thermal generation	100	%	123	Various	Various
	Total net capacity (excluding equivalent MWt)			2,037
	(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 June 30, 2014.
	(b) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 118 MWt which is available under the right-to-use provisions contained in agreements between two of NRG Yield Inc.'s thermal facilities and certain of their customers

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	6 Months Ended
	Jun. 30, 2014
Accounting Policies [Abstract]	'
Schedule of Change in Noncontrolling Interest [Table Text Block]	'
	Noncontrolling Interest
	The following table reflects the changes in the Company's noncontrolling interest balance:
		(In millions)
	Balance as of December 31, 2013 (As previously reported)	$	382
	Net Assets of Acquired ROFO Assets as of December 31, 2013	241
	Balance as of December 31, 2013 (As currently reported)	623
	Payment to NRG for Acquired ROFO assets	(357		)
	Comprehensive income, including pre-acquisition net income from Acquired ROFO Assets	35
	Non-cash contributions	14
	Cash distributions, net of cash contributions	(51		)
	Balance as of June 30, 2014	$	264

Business_Acquisition_1_Tables

Business Acquisition 1 (Tables)	6 Months Ended
	Jun. 30, 2014
Business Combinations [Abstract]	'
Schedule of Components of Purchase Price	'
	The purchase price is expected to be funded by the following components:
			(in millions)
	Issuance of corporate bonds		$	500
	Issuance of Class A common stock		370
	Total		$	870
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	'
	The following is a summary of assets and liabilities transferred in connection with the acquisition:
		RE Kansas South			TA High Desert		El Segundo
		(In millions)
	Current assets	$	1		$	3	$	43
	Property, plant and equipment	50			67		625
	Non-current assets	2			13		76
	Total assets	53			83		744
	Debt	35			57		520
	Other current and non-current liabilities	2			—		30
	Total liabilities	37			57		550
	Net assets acquired	$	16		$	26	$	194
	The following table presents historical information summary combining the financial information for the Acquired ROFO assets transferred in connection with the acquisition:
		December 31, 2013
		As Previously Reported			RE Kansas South		TA High Desert		El Segundo			As Currently Reported
					(In millions)
	Current assets	$	267		$	25	$	28	$	58		$	378
	Property, plant and equipment	1,541			51		63		636			2,291
	Non-current assets	505			3		10		51			569
	Total assets	2,313			79		101		745			3,238
	Debt	1,133			58		80		512			1,783
	Other current and non-current liabilities	169			5		3		26			203
	Total liabilities	$	1,302		$	63	$	83	$	538		$	1,986
Financial Information of Acquisition	'
		Three months ended June 30, 2013												Six months ended June 30, 2013
		As Previously Reported			RE Kansas South		TA High Desert		El Segundo			As Currently Reported		As Previously Reported		RE Kansas South		TA High Desert		El Segundo			As Currently Reported
							(In millions)
	Operating revenues	$	79		$	—	$	3	$	—		$	82	$	132	$	—	$	3	$	—		$	135
	Operating income	38			—		1		(1		)	38		50		—		1		(1		)	50
	Net income	$	34		$	1	$	—	$	—		$	35	$	45	$	1	$	—	$	—		$	46

Property_Plant_and_Equipment_T

Property, Plant and Equipment (Tables)	6 Months Ended
	Jun. 30, 2014
Property, Plant and Equipment [Abstract]	'
Schedule of Property, Plant and Equipment	'
		June 30, 2014			31-Dec-13			Depreciable Lives
		(In millions)
	Facilities and equipment	$	2,429		$	2,411		5 - 40 Years
	Land and improvements	48			48
	Construction in progress	11			6
	Total property, plant and equipment	2,488			2,465
	Accumulated depreciation	(233		)	(174		)
	Net property, plant and equipment	$	2,255		$	2,291

Variable_Interest_Entities_or_1

Variable Interest Entities, or VIEs Variable Interest Entities, or VIEs (Tables)	6 Months Ended
	Jun. 30, 2014
Variable Interest Entities Disclosure [Abstract]	'
Summarized unaudited financial information for GCE Holdings LLC	'
	The following table presents summarized unaudited financial information for GCE Holdings LLC:
		Three months ended June 30,				Six months ended June 30,
		2014		2013		2014		2013
	Income Statement Data:	(In millions)
	Operating revenues	$	18	$	19	$	44	$	39
	Operating income	10		12		20		23
	Net income	7		7		14		15
		June 30, 2014		December 31, 2013
	Balance Sheet Data:	(In millions)
	Current assets	$	31	$	32
	Non-current assets	446		453
	Current liabilities	16		18
	Non-current liabilities	228		231

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2014
Fair Value Disclosures [Abstract]	'
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 June 30, 2014								As of December 31, 2013
		Carrying Amount				Fair Value				Carrying Amount		Fair Value
		(In millions)
	Assets:
	Notes receivable — affiliate	$	—			$	—			$	2	$	2
	Notes receivable, including current portion	23				23				27		27
	Liabilities:
	Long-term debt, including current portion	1,999				2,087				1,783		1,785
Assets and liabilities measured and recorded at fair value on the consolidated balance sheets on a recurring basis	'
	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 June 30, 2014
		Fair Value (a)
	(In millions)	Level 2				Level 3				Total
	Derivative assets:
	Commodity contracts	$	1			$	—			$	1
	Interest rate contracts	5				—				5
	Total assets	6				—				6
	Derivative liabilities:
	Commodity contracts	1				1				2
	Interest rate contracts	52				—				52
	Total liabilities	$	53			$	1			$	54
	(a) There were no assets or liabilities classified as Level 1 as of June 30, 2014.
		As of December 31, 2013
		Fair Value (a)
	(In millions)	Level 2				Level 3				Total
	Derivative assets:
	Commodity contracts	$	1			$	—			$	1
	Interest rate contracts	20				—				20
	Total assets	21				—				21
	Derivative liabilities:
	Commodity contracts	1				1				2
	Interest rate contracts	45				—				45
	Total liabilities	$	46			$	1			$	47
	(a) There were no assets or liabilities classified as Level 1 as of December 31, 2013.
Reconciliation of beginning and ending balances for financial instruments that are recognized at fair value in the consolidated financial statements at least annually using significant unobservable inputs	'
	The following table reconciles, for the three and six months ended June 30, 2014, the beginning and ending balances for derivative instruments that are recognized at fair value in the consolidated financial statements, at least annually, using significant unobservable inputs:
			Fair Value Measurement Using Significant Unobservable Inputs - Derivatives (Level 3)
			Three months ended June 30,				Six months ended June 30,
	(In millions)		2014				2014
	Beginning balance		$	(1	)		$	(1	)
	Purchases		—				—
	Ending balance as of June 30, 2014		$	(1	)		$	(1	)

Accounting_for_Derivative_Inst1

Accounting for Derivative Instruments and Hedging Activities (Tables)	6 Months Ended
	Jun. 30, 2014
Accounting for 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 as of June 30, 2014 and December 31, 2013.
			Total Volume
			June 30, 2014			December 31, 2013
	Commodity	Units	(In millions)
	Natural Gas	MMBtu	2			2
	Interest	Dollars	$	1,215		$	1,234
Fair value within the derivative instrument valuation on the balance sheets	'
	The following table summarizes the fair value within the derivative instrument valuation on the balance sheet:
		Fair Value
		Derivative Assets						Derivative Liabilities
		June 30, 2014			December 31, 2013			June 30, 2014			December 31, 2013
		(In millions)
	Derivatives Designated as Cash Flow Hedges:
	Interest rate contracts current	$	—		$	—		$	26		$	26
	Interest rate contracts long-term	4			14			22			16
	Total Derivatives Designated as Cash Flow Hedges	4			14			48			42
	Derivatives Not Designated as Cash Flow Hedges:
	Interest rate contracts current	—			—			3			3
	Interest rate contracts long-term	1			6			1			—
	Commodity contracts current	1			1			1			2
	Commodity contracts long-term	—			—			1			—
	Total Derivatives Not Designated as Cash Flow Hedges	2			7			6			5
	Total Derivatives	$	6		$	21		$	54		$	47
Offsetting of derivatives by counterparty master agreement level and collateral received or paid	'
	The following table summarizes the offsetting of derivatives by counterparty master agreement level:
		Gross Amounts Not Offset in the Statement of Financial Position
		Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
	As of June 30, 2014	(In millions)
	Commodity contracts:
	Derivative assets	$	1		$	—		$	1
	Derivative liabilities	(2		)	—			(2		)
	Total commodity contracts	(1		)	—			(1		)
	Interest rate contracts:
	Derivative assets	5			(3		)	2
	Derivative liabilities	(52		)	3			(49		)
	Total interest rate contracts	(47		)	—			(47		)
	Total derivative instruments	$	(48	)	$	—		$	(48	)
		Gross Amounts Not Offset in the Statement of Financial Position
	As of December 31, 2013	Gross Amounts of Recognized Assets/Liabilities			Derivative Instruments			Net Amount
	Commodity contracts:	(In millions)
	Derivative assets	$	1		$	—		$	1
	Derivative liabilities	(2		)	—			(2		)
	Total commodity contracts	(1		)	—			(1		)
	Interest rate contracts:
	Derivative assets	20			(12		)	8
	Derivative liabilities	(45		)	12			(33		)
	Total interest rate contracts	(25		)	—			(25		)
	Total derivative instruments	$	(26	)	$	—		$	(26	)
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 other comprehensive loss, or OCL, balance attributable to interest rate swaps designated as cash flow hedge derivatives, net of tax:
		Three months ended June 30,						Six months ended June 30,
		2014			2013			2014			2013
		(In millions)						(In millions)
	Accumulated OCL beginning balance, net of tax	$	(12	)	$	(34	)	$	—		$	(38	)
	Reclassified from accumulated OCL to income due to realization of previously deferred amounts	4			3			7			5
	Mark-to-market of cash flow hedge accounting contracts	(16		)	22			(31		)	24
	Accumulated OCL ending balance, net of income tax benefit of $1 and $3, respectively	(24		)	(9		)	(24		)	(9		)
	Accumulated OCL attributable to noncontrolling interest	(15		)				(15		)
	Accumulated OCL attributable to NRG Yield, Inc.	$	(9	)				$	(9	)

Longterm_Debt_Tables

Long-term Debt (Tables)	6 Months Ended
	Jun. 30, 2014
Debt Disclosure [Abstract]	'
Schedule of Long-term Debt	'
		June 30, 2014		December 31, 2013		Current interest rate % (a)
		(In millions, except rates)
	Convertible Senior Notes, due 2019 (b)	$	324	$	—	3.5
	Project-level debt:
	NRG West Holdings LLC, due 2023	520		512		L+2.50/L+2.875
	NRG Marsh Landing LLC, due 2017 and 2023	464		473		L+ 2.75/L+3.00
	NRG Solar Alpine LLC, due 2022	170		221		L+2.5/L+1.75
	NRG Energy Center Minneapolis LLC, senior secured notes, due 2017 and 2025	124		127		5.95/7.25
	NRG Solar Borrego LLC, due 2024 and 2038	77		78		L+ 2.50/5.65
	South Trent Wind LLC, due 2020	66		69		L+ 2.625/L+2.75
	NRG Solar Avra Valley LLC, due 2031	62		63		L+ 2.25
	TA High Desert LLC, due 2023 and 2033	57		80		L+2.50/5.15
	NRG Roadrunner LLC, due 2031	43		44		L+ 2.01
	NRG Solar Kansas South LLC, due 2031	35		58		L+2.625
	NRG Solar Blythe LLC, due 2028	24		24		L+ 2.75
	PFMG and related subsidiaries financing agreement, due 2030	31		32		6
	NRG Energy Center Princeton LLC, due 2017	2		2		5.95
	Subtotal project-level debt:	1,675		1,783
	Total debt	1,999		1,783
	Less current maturities	119		214
	Total long-term debt	$	1,880	$	1,569
	(a) As of June 30, 2014, L+ equals 3 month LIBOR plus x%, except for Kansas South where L+ equals 6 month LIBOR plus x% .
	(b) Net of discount of $21 million as of June 30, 2014.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	6 Months Ended
	Jun. 30, 2014
Earnings Per Share [Abstract]	'
Reconciliation of NRG's basic earnings per share to diluted earnings per share	'
	The reconciliation of the Company's basic and diluted earnings per share is shown in the following table:
		Three months ended June 30,		Six months ended June 30,
		2014		2014
	(In millions, except per share data)
	Basic and diluted earnings per share attributable to Class A common stockholders
	Net Income Attributable to NRG Yield, Inc.	$	6	$	10
	Weighted average number of Class A common shares outstanding	23		23
	Basic and Diluted Earnings per Class A common share:	$	0.26	$	0.42

Changes_in_Capital_Structure_T

Changes in Capital Structure (Tables)	6 Months Ended
	Jun. 30, 2014
Equity [Abstract]	'
Dividends Paid	'
	The following table lists the dividends paid on the Company's Class A common stock during the six months ended June 30, 2014:
		Second Quarter 2014		First Quarter 2014
	Dividends per share	$	0.35	$	0.33

Segment_Reporting_Tables

Segment Reporting (Tables)	6 Months Ended
	Jun. 30, 2014
Segment Reporting [Abstract]	'
Schedule of Segment Reporting Information, by Segment	'
		Three months ended June 30, 2014
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	61		$	30		$	43		$	—		$	134
	Cost of operations	12			3			30			—			45
	Depreciation and amortization	24			7			5			—			36
	General and administrative — affiliate	—			—			—			2			2
	Operating income/(loss)	25			20			8			(2		)	51
	Equity in earnings of unconsolidated affiliates	4			10			—			—			14
	Interest expense	(11		)	(11		)	(2		)	(5		)	(29		)
	Income/(loss) before income taxes	18			19			6			(7		)	36
	Net income/(loss)	18			19			6			(9		)	34
	Total assets	$	1,535		$	905		$	362		$	434		$	3,236
		Three months ended June 30, 2013
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	20		$	26		$	36		$	—		$	82
	Cost of operations	3			2			27			—			32
	Depreciation and amortization	2			5			3			—			10
	General and administrative — affiliate	—			—			—			2			2
	Operating income/(loss)	15			19			6			(2		)	38
	Equity in earnings of unconsolidated affiliates	3			(1		)	—			—			2
	Interest expense	(3		)	(1		)	(2		)	—			(6		)
	Other income, net	1			—			—			—			1
	Income/(loss) before income taxes	16			17			4			(2		)	35
	Net income/(loss)	$	16		$	17		$	4		$	(2	)	$	35
		Six months ended June 30, 2014
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	117		$	49		$	108		$	—		$	274
	Cost of operations	22			7			76			—			105
	Depreciation and amortization	36			15			9			—			60
	General and administrative — affiliate	—			—			—			4			4
	Operating income/(loss)	59			27			23			(4		)	105
	Equity in earnings of unconsolidated affiliates	7			8			—			—			15
	Interest expense	(22		)	(22		)	(4		)	(8		)	(56		)
	Other income	—			1			—			—			1
	Income/(loss) before income taxes	44			14			19			(12		)	65
	Net income/(loss)	$	44		$	14		$	19		$	(17	)	$	60
		Six months ended June 30, 2013
	(In millions)	Conventional Generation			Renewables			Thermal			Corporate			Total
	Operating revenues	$	20		$	42		$	73		$	—		$	135
	Cost of operations	3			5			53			—			61
	Depreciation and amortization	2			11			7			—			20
	General and administrative — affiliate	—			—			—			4			4
	Operating income/(loss)	15			26			13			(4		)	50
	Equity in earnings of unconsolidated affiliates	7			(1		)	—			—			6
	Interest expense	(3		)	(4		)	(4		)	—			(11		)
	Other income, net	1			—			—			—			1
	Income/(loss) before income taxes	20			21			9			(4		)	46
	Net income/(loss)	$	20		$	21		$	9		$	(4	)	$	46

Income_Taxes_Tables

Income Taxes (Tables)	6 Months Ended
	Jun. 30, 2014
Income Tax Disclosure [Abstract]	'
Effective tax rate	'
	Effective Tax Rate
	The income tax provision consisted of the following:
		Three months ended June 30,						Six months ended June 30,
	(In millions, except otherwise noted)	2014			2013			2014			2013
	Income before income taxes	$	36		$	35		$	65		$	46
	Income tax expense	2			—			5			—
	Effective tax rate	5.6		%	—		%	7.7		%	—		%

Nature_of_Business_Nature_of_B1

Nature of Business Nature of Business (Details) (USD $)

3 Months Ended

6 Months Ended

1 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

0 Months Ended

In Millions, except Share data, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jul. 31, 2013

Jul. 31, 2013

Jul. 22, 2013

Jul. 22, 2013

Jun. 30, 2014

Jul. 22, 2013

Jun. 30, 2014

Jun. 30, 2014

Jul. 22, 2013

Jul. 22, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jul. 29, 2014

Jul. 29, 2014

Jul. 29, 2014

Jul. 29, 2014

MW

MW

Conventional

Utility-Scale Solar

Distributed Solar

Thermal

NRG

NRG Yield LLC

Public Shareholders

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

GenConn Middletown

GenConn Devon

Marsh Landing

El Segundo [Member]

Alpine

Avenal [Member]

Avra Valley

Blythe

Borrego

Roadrunner

RE Kansas South [Member]

TA - High Desert LLC [Member]

CVSR

AZ DG Solar Projects

PFMG DG Solar Projects

South Trent

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

MW

MW

MW

MW

Common Class A

NRG Yield, Inc.

NRG Yield, Inc.

NRG

NRG

NRG

NRG

Class A units of NRG Yield LLC

Conventional

Conventional

Conventional

Conventional

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Utility-Scale Solar

Distributed Solar

Distributed Solar

Wind

Public Shareholders

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

Class A units of NRG Yield LLC

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

MW

Common Class A

NRG Yield, Inc.

NRG

NRG

Class A units of NRG Yield LLC

Nature of Business

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Document Period End Date

'

'

30-Jun-14

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

General and administrative b affiliate

$2

$2

[1]

$4

$4

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Number of Shares Issued in Transaction

'

'

'

'

'

'

'

'

'

'

22,511,250

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,075,000

'

'

'

Sale of Stock, Number of Shares Acquired in Transaction

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

19,011,250

3,500,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,075,000

Payments to Acquire Interest in Subsidiaries and Affiliates

'

'

'

'

'

'

'

'

395

73

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for Underwriting Expense

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$630

'

'

'

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

'

'

'

'

'

'

'

'

'

'

'

34.50%

34.50%

65.50%

65.50%

65.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

44.70%

55.30%

'

Percentage of Ownership

'

'

'

'

'

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

49.95%

49.95%

100.00%

100.00%

100.00%

49.95%

100.00%

100.00%

100.00%

100.00%

100.00%

100.00%

48.95%

[2]

100.00%

51.00%

100.00%

'

'

'

'

Power Generation Capacity (in MWs)

2,037

[3]

'

2,037

[3]

'

1,460

[3]

343

[3]

10

[3]

123

[3]

'

'

'

'

'

'

'

'

'

'

95

[3]

95

[3]

720

[3]

550

[3]

66

[3]

23

[3]

25

[3]

21

[3]

26

[3]

20

[3]

20

[3]

20

[3]

122

[2],[3]

5

[3]

5

[3]

101

[3]

'

'

'

'

Steam and Chilled Water Capacity, Megawatts Thermal Equivalent

'

'

'

'

'

'

'

1,346

[2],[3]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

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

[2]

(b) For thermal energy, net capacity represents MWt for steam or chilled water and excludes 118 MWt which is available under the right-to-use provisions contained in agreements between two of NRG Yield Inc.'s thermal facilities and certain of their customers

[3]

Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of June 30, 2014.

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details) (USD $)

0 Months Ended

3 Months Ended

6 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

In Millions, except Per Share data, unless otherwise specified

Jan. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

5-May-14

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Noncontrolling Interest [Member]

Common Class B

Scenario, Previously Reported [Member]

ROFO [Member]

TA High Desert, RE Kansas South, and El Segundo Energy Center [Member]

NRG

Noncontrolling Interest [Member]

Noncontrolling Interest [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

Noncontrolling interest

'

$264

'

'

$264

'

$623

[1]

'

'

$382

'

'

'

Payment to NRG for Acquired ROFO Assets

'

'

'

'

-357

0

[1]

'

'

'

'

'

'

'

Less: Comprehensive income attributable to NRG

'

11

'

59

18

74

'

35

'

'

'

'

'

Non-cash adjustment to non-controlling interest

'

'

'

'

'

'

'

14

'

'

'

'

'

Cash distributions, net of cash contributions

'

'

'

'

'

'

'

-51

'

'

'

'

'

Dividends

$0.33

$0.35

$0.33

'

$0.68

'

'

'

$0.35

'

'

'

'

Assets acquired

'

'

'

'

'

'

3,238

'

'

2,313

241

113

'

Distributions

'

'

'

'

'

'

'

'

'

'

'

'

$24

[1]

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

Business_Acquisition_Details

Business Acquisition (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

In Millions, except Share data, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 03, 2014

Jun. 03, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Aug. 05, 2014

Aug. 05, 2014

Jul. 22, 2013

Jul. 29, 2014

Jul. 30, 2014

Jul. 29, 2014

Jun. 30, 2013

Jun. 30, 2013

Dec. 31, 2013

MW

MW

GenConn Energy LLC

RE Kansas South [Member]

RE Kansas South [Member]

RE Kansas South [Member]

RE Kansas South [Member]

TA - High Desert LLC [Member]

TA - High Desert LLC [Member]

TA - High Desert LLC [Member]

TA - High Desert LLC [Member]

El Segundo [Member]

El Segundo [Member]

El Segundo [Member]

El Segundo [Member]

Alta Wind Holdings [Member]

Alta Wind Holdings [Member]

Drop-down Acquisition [Member]

Drop-down Acquisition [Member]

Energy Systems Company [Member]

Customer Contracts [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Public Shareholders

Public Shareholders

Public Shareholders

Public Shareholders

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

Scenario, Previously Reported [Member]

MW

MW

Energy Systems Company [Member]

5.375% Senior Notes due in 2024 [Member]

5.375% Senior Notes due in 2024 [Member]

Common Class A

Common Class A

Common Class A

Common Class A

NRG Yield Operating LLC [Member]

NRG Yield Operating LLC [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Alta Wind Holdings [Member]

Business Acquisition

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of Facilities

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

Sale of Stock, Number of Shares Issued in Transaction

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

22,511,250

12,075,000

'

12,075,000

'

'

'

Share Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$54

'

'

'

'

Issuance of corporate bonds

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Issuance of Class A common stock

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'370

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Consideration Transferred

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

870

'

349

'

'

'

'

'

'

'

'

'

'

'

'

Current assets

'

'

'

'

378

'

'

'

1

25

'

'

3

28

'

'

43

58

'

'

'

'

'

'

'

'

'

'

'

'

'

'

267

Property, plant and equipment

'

'

'

'

2,291

'

'

'

50

51

'

'

67

63

'

'

625

636

'

'

'

'

60

'

'

'

'

'

'

'

'

'

1,541

Non-current assets

'

'

'

'

569

'

'

'

2

3

'

'

13

10

'

'

76

51

'

'

'

'

'

'

'

'

'

'

'

'

'

'

505

Total assets

'

'

'

'

3,238

'

'

'

53

79

'

'

83

101

'

'

744

745

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,313

Debt

'

'

'

'

1,783

'

'

'

35

58

'

'

57

80

'

'

520

512

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,133

Other current and non-current liabilities

'

'

'

'

203

'

'

'

2

5

'

'

0

3

'

'

30

26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

169

Total liabilities

'

'

'

'

1,986

'

'

'

37

63

'

'

57

83

'

'

550

538

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,302

Net assets acquired

'

'

'

'

'

'

'

'

16

'

'

'

26

'

'

'

194

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisition, Consideration Transferred, Working Capital

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,600

'

8

'

'

'

'

'

'

'

'

'

'

'

Payments for Underwriting Expense

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

630

'

'

'

'

'

Proceeds from Issuance of Senior Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500

'

'

'

'

'

'

'

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.38%

'

'

'

'

'

'

'

Payments to Acquire Businesses, Gross

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

120

'

'

'

'

'

'

'

'

'

'

Power Generation Capacity (in MWs)

2,037

[1]

'

2,037

[1]

'

'

190

'

'

'

'

'

'

'

'

'

'

'

'

'

947

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

59

'

'

'

'

'

'

'

'

'

Working Capital

'

'

'

'

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Business Acquisitions, Consideration Transferred, Purchase Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

357

'

'

'

'

'

'

'

'

'

'

'

Business Combination, Consideration Transferred, Liabilities Incurred

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

612

'

'

'

'

'

'

'

'

'

'

'

'

Total operating revenues

134

82

[2]

274

135

[2]

'

'

0

0

'

'

3

3

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

79

132

'

Operating Income (Loss)

51

38

[2]

105

50

[2]

'

'

0

0

'

'

1

1

'

'

-1

-1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

38

50

'

Net income/(loss)

$34

$35

[2]

$60

$46

[2]

'

'

$1

$1

'

'

$0

$0

'

'

$0

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$34

$45

'

[1]

Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of June 30, 2014.

[2]

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

Property_Plant_and_Equipment_D

Property, Plant and Equipment (Details) (USD $)

6 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

16-May-13

Jun. 30, 2014

Jun. 30, 2013

16-May-13

Jun. 30, 2014

Jun. 30, 2013

16-May-13

Jun. 30, 2014

Jun. 30, 2014

Facilities and equipment

Facilities and equipment

Construction in progress

Construction in progress

Borrego

Borrego

Borrego

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

Minimum [Member]

Maximum [Member]

Facilities and equipment

Facilities and equipment

Property, Plant and Equipment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total property, plant and equipment

$2,488

'

$2,465

[1]

$2,429

$2,411

$11

$6

'

'

'

'

'

'

'

'

'

'

'

Land and Land Improvements

48

'

48

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated depreciation

-233

'

-174

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Net property, plant and equipment

2,255

'

2,291

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Renewable energy grant, gross

'

'

'

'

'

'

'

'

'

39

'

'

25

'

'

23

'

'

Renewable energy grants, net

'

'

'

'

'

'

'

'

36

'

'

'

'

'

21

'

'

'

Deferred Tax Assets, Deferred Income

'

'

'

'

'

'

'

'

'

'

'

6

'

'

6

'

'

'

Deferred tax asset, renewable energy grant

'

'

'

'

'

'

'

'

10

'

'

'

'

'

'

'

'

'

Property, plant and equipment, useful life

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'5 years

'40 years

Payments for (Proceeds from) Other Investing Activities

($11)

$0

[1]

'

'

'

'

'

$30

'

'

$20

'

'

$21

'

'

'

'

[1]

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

Variable_Interest_Entities_or_2

Variable Interest Entities, or VIEs (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

12 Months Ended

1 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2010

Jun. 30, 2011

Jun. 30, 2014

Jun. 30, 2014

MW

MW

GCE Holdings LLC

GCE Holdings LLC

GCE Holdings LLC

GCE Holdings LLC

GCE Holdings LLC

GenConn Energy LLC

GenConn Energy LLC

GenConn Devon

GenConn Middletown

Fixed Rate Notes

Working Capital Facility

MW

GenConn Energy LLC

GenConn Energy LLC

GenConn Energy LLC

GenConn Energy LLC

facility

generatingunit

generatingunit

Variable Interest Entity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Economic interest in equity method investments (as a percent)

'

'

'

'

'

49.95%

'

49.95%

'

'

'

'

'

'

'

'

Power generation units

'

'

'

'

'

'

'

'

'

'

'

2

'

'

'

'

Power Generation Capacity (in MWs)

2,037

[1]

'

2,037

[1]

'

'

'

'

'

'

'

'

190

'

'

'

'

Number of Units Reached Commercial Operation at Peaking Generation Facilities

'

'

'

'

'

'

'

'

'

'

'

'

4

4

'

'

Equity investments in affiliates

$253

'

$253

'

$227

[2]

'

'

'

'

'

$116

'

'

'

'

'

Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

237

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4.73%

1.88%

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

35

Operating revenues

134

82

[2]

274

135

[2]

'

18

19

44

39

'

'

'

'

'

'

'

Operating income

51

38

[2]

105

50

[2]

'

10

12

20

23

'

'

'

'

'

'

'

Net income/(loss)

34

35

[2]

60

46

[2]

'

7

7

14

15

'

'

'

'

'

'

'

Current assets

196

'

196

'

378

[2]

31

'

31

'

32

'

'

'

'

'

'

Non-current assets

785

'

785

'

569

[2]

446

'

446

'

453

'

'

'

'

'

'

Current liabilities

233

'

233

'

369

[2]

16

'

16

'

18

'

'

'

'

'

'

Non-current liabilities

$1,930

'

$1,930

'

$1,617

[2]

$228

'

$228

'

$231

'

'

'

'

'

'

[1]

Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of June 30, 2014.

[2]

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

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Interest rate contracts

Interest rate contracts

Commodity contracts

Commodity contracts

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Non-affiliate

Non-affiliate

Carrying Amount

Carrying Amount

Carrying Amount

Carrying Amount

Carrying Amount

Fair Value

Fair Value

Fair Value

Fair Value

Fair Value

Fair Value

Derivative [Member]

Derivative [Member]

Derivative [Member]

Derivative [Member]

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 3

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Fair Value, Inputs, Level 2

Interest rate contracts

Interest rate contracts

Commodity contracts

Commodity contracts

Affiliate

Affiliate

Non-affiliate

Affiliate

Affiliate

Non-affiliate

Non-affiliate

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Fair Value, Measurements, Recurring

Interest rate contracts

Interest rate contracts

Commodity contracts

Commodity contracts

Interest rate contracts

Interest rate contracts

Commodity contracts

Commodity contracts

Fair Value of Financial Instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Financing Receivable, Gross

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0

$2,000,000

$23,000,000

'

'

$0

$2,000,000

$23,000,000

$27,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Assets

6,000,000

[1]

'

6,000,000

[1]

21,000,000

[1]

5,000,000

20,000,000

1,000,000

1,000,000

'

'

5,000,000

[1]

20,000,000

[1]

1,000,000

[1]

1,000,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

[1]

0

[1]

0

[1]

0

[1]

0

[1]

0

[1]

6,000,000

[1]

21,000,000

[1]

'

'

5,000,000

[1]

20,000,000

[1]

1,000,000

[1]

1,000,000

[2]

Derivative Liabilities

54,000,000

'

54,000,000

47,000,000

52,000,000

45,000,000

2,000,000

2,000,000

54,000,000

[1]

47,000,000

[1]

52,000,000

[1]

45,000,000

[1]

2,000,000

[1]

2,000,000

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000,000

[1]

1,000,000

[1]

0

[1]

0

[1]

1,000,000

[1]

1,000,000

[1]

'

'

53,000,000

[1]

46,000,000

[1]

52,000,000

[1]

45,000,000

[1]

1,000,000

[1]

1,000,000

[1]

Fair Value, Assets And Liabilities, Level 1 to Level 2 Transfers, Amount

0

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Asset And Liability Value

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1,000,000

-1,000,000

-1,000,000

-1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset and Liability, Purchases

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Asset, Fair Value Determined Using Valuation Techniques (as a percent)

0.00%

'

0.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Liability, Fair Value Determined Using Valuation Techniques (as a percent)

2.00%

'

2.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Concentration of Credit Risk

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Credit risk exposure under certain long-term agreements for the next five years

'

'

1,100,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Period of credit risk exposure under certain long-term agreements (in years)

'

'

'5 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,999,000,000

$1,783,000,000

$1,999,000,000

$1,783,000,000

'

'

'

$2,087,000,000

$1,785,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

(a) There were no assets or liabilities classified as Level 1 as of June 30, 2014.

[2]

(a) There were no assets or liabilities classified as Level 1 as of December 31, 2013.

Accounting_for_Derivative_Inst2

Accounting for Derivative Instruments and Hedging Activities (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

12 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Reclassification out of Accumulated Other Comprehensive Income

Reclassification out of Accumulated Other Comprehensive Income

Reclassification out of Accumulated Other Comprehensive Income

Reclassification out of Accumulated Other Comprehensive Income

Derivatives Designated as Cash Flow Hedges

Derivatives Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Interest rate contracts current

Interest rate contracts current

Interest rate contracts current

Interest rate contracts current

Interest rate contracts long-term

Interest rate contracts long-term

Interest rate contracts long-term

Interest rate contracts long-term

Commodity contracts current

Commodity contracts current

Commodity Contract Non Current [Member]

Commodity Contract Non Current [Member]

Commodity contracts

Commodity contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

Interest rate contracts

MMbtu

MMbtu

Dollars

Dollars

Noncontrolling Interest [Member]

Derivatives Designated as Cash Flow Hedges

Derivatives Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Designated as Cash Flow Hedges

Derivatives Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Derivatives Not Designated as Cash Flow Hedges

Natural Gas

Natural Gas

Interest

Interest

Derivative

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Underlying, Derivative

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000

2,000,000

'

'

'

Derivative, Notional Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$1,215

$1,234

'

Fair Value of Derivative Instruments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Derivative Assets

6

[1]

'

6

[1]

'

21

[1]

'

'

'

'

4

14

2

7

0

0

0

0

4

14

1

6

1

1

'

0

1

1

5

'

5

'

20

'

'

'

'

'

Derivative Liabilities

-54

'

-54

'

-47

'

'

'

'

-48

-42

-6

-5

-26

-26

-3

-3

-22

-16

-1

0

-1

-2

-1

0

-2

-2

-52

'

-52

'

-45

'

'

'

'

'

Fair Value of Gross Derivative Assets/(Liabilities), Net

-48

'

-48

'

-26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1

-1

-47

'

-47

'

-25

'

'

'

'

'

Derivative Liability, Fair Value, Gross Asset

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

3

'

3

'

12

'

'

'

'

'

Derivative, Collateral, Right to Reclaim Cash

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-2

-2

-49

'

-49

'

-33

'

'

'

'

'

Derivative Asset, Fair Value, Gross Liability

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

-3

'

-3

'

-12

'

'

'

'

'

Derivative Asset

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1

1

2

'

2

'

8

'

'

'

'

'

Derivative Asset Fair Value Gross Liability Net Of Derivative Liability Fair Value Gross Asset

0

'

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0

0

0

'

0

'

0

'

'

'

'

'

Derivative Asset, Fair Value, Amount Offset Against Collateral Net Of Derivative Liability, Fair Value, Amount Offset Against Collateral

-48

'

-48

'

-26

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-1

-1

-47

'

-47

'

-25

'

'

'

'

'

Accumulated Other Comprehensive Income (Loss), Net of Tax

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated OCL beginning balance, net of tax

-12

-34

0

-38

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-9

Reclassified from accumulated OCL to income due to realization of previously deferred amounts

34

35

[2]

60

46

[2]

'

4

3

7

5

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mark-to-market of cash flow hedge accounting contracts

-16

22

-31

24

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated OCL ending balance, net of income tax benefit of $1 and $3, respectively

-24

-9

-24

-9

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

-9

Accumulated OCL attributable to noncontrolling interest

-15

'

-15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Accumulated OCI ending balance, income tax of $---- and $15, respectively

1

3

1

3

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss expected to be realized from OCI during the next 12 months, net of tax

'

'

15

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Loss expected to be realized from OCI during the next 12 months, tax

0

'

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Summary of Derivative Instruments Impact on Results of Operations

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Unrealized gain/(loss) on derivatives

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

($3)

$6

($6)

$9

'

'

'

'

'

'

[1]

(a) There were no assets or liabilities classified as Level 1 as of June 30, 2014.

[2]

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

Longterm_Debt_Details

Long-term Debt (Details) (USD $)

3 Months Ended

6 Months Ended

6 Months Ended

6 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

1 Months Ended

3 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

3 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

6 Months Ended

3 Months Ended

1 Months Ended

6 Months Ended

3 Months Ended

1 Months Ended

0 Months Ended

0 Months Ended

0 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

1 Months Ended

6 Months Ended

1 Months Ended

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2013

Feb. 11, 2014

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Aug. 31, 2011

Aug. 23, 2011

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Mar. 31, 2013

Mar. 16, 2012

Mar. 31, 2014

Mar. 31, 2013

Jan. 15, 2013

Mar. 16, 2012

Jun. 30, 2014

Jun. 30, 2014

Mar. 31, 2014

Jun. 24, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2013

Mar. 31, 2013

Mar. 31, 2013

Mar. 31, 2013

Apr. 30, 2014

Mar. 31, 2013

Dec. 31, 2013

Mar. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Mar. 31, 2013

Mar. 31, 2013

Jun. 30, 2014

Mar. 31, 2013

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Apr. 25, 2014

Jun. 30, 2014

Feb. 11, 2014

Jun. 30, 2014

Dec. 31, 2013

Aug. 31, 2011

Jun. 30, 2014

Aug. 23, 2011

Jun. 30, 2014

Aug. 23, 2011

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Apr. 30, 2014

Jul. 09, 2014

Jul. 09, 2014

Jul. 17, 2014

Jul. 17, 2014

Jul. 17, 2014

Jul. 17, 2014

Jul. 17, 2014

Jul. 17, 2014

Aug. 05, 2014

Aug. 05, 2014

Jun. 30, 2014

Jun. 30, 2014

Aug. 31, 2011

Jun. 30, 2014

Aug. 31, 2011

Jun. 30, 2014

Jun. 30, 2014

Jun. 30, 2014

Aug. 31, 2011

MW

MW

Kansas South [Member]

Affiliate

Affiliate

Non-affiliate

Non-affiliate

TA - High Desert LLC [Member]

TA - High Desert, due 2023 [Member]

High Desert Facility, due 2023 [Member]

Avra Valley

West Holdings Credit Agreement [Member]

West Holdings Credit Agreement [Member]

NRG Marsh Landing LLC, due 2017 and 2023

NRG Marsh Landing LLC, due 2017 and 2023

NRG Marsh Landing LLC, due 2017

NRG Marsh Landing LLC, due 2017

NRG Marsh Landing LLC, due 2023

NRG Marsh Landing LLC, due 2023

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine LLC, due 2013 and 2022

NRG Solar Alpine, due 2022

Alpine

Alpine

Alpine

NRG Energy Center Minneapolis LLC, senior secured notes, due 2013, 2017, and 2025

NRG Energy Center Minneapolis LLC, senior secured notes, due 2013, 2017, and 2025

NRG Energy Center Minneapolis LLC Senior Secured Notes, due 2017 [Member]

NRG Energy Center Minneapolis LLC, senior secured notes, due 2025

NRG West Holdings LLC [Member]

NRG West Holdings LLC [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

High Desert Facility [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

Kansas South [Member]

TA - High Desert LLC [Member]

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Solar Borrego I LLC, due 2024 and 2038

NRG Borrego I LLC, due 2024

NRG Borrego I LLC, due 2024

NRG Borrego I LLC, due 2038

South Trent Wind LLC, due 2020

South Trent Wind LLC, due 2020

South Trent Wind LLC, due 2020

NRG Solar Avra Valley LLC, due 2031

NRG Solar Avra Valley LLC, due 2031

NRG Solar Avra Valley LLC, due 2031

NRG Roadrunner LLC, due 2031

NRG Roadrunner LLC, due 2031

NRG Roadrunner LLC, due 2031

NRG Roadrunner LLC, due 2031

NRG Solar Blythe LLC, due 2028

NRG Solar Blythe LLC, due 2028

NRG Solar Blythe LLC, due 2028

NRG Solar Blythe LLC, due 2028

PFMG and related subsidiaries, due 2030

PFMG and related subsidiaries, due 2030

PFMG and related subsidiaries, due 2030

NRG Energy Center Princeton LLC, due 2017 [Member]

NRG Energy Center Princeton LLC, due 2017 [Member]

NRG Yield Revolving Credit Facility

NRG Yield Revolving Credit Facility

Convertible Debt [Member]

Convertible Debt [Member]

Project [Domain]

Project [Domain]

West Holdings Credit Agreement Tranche A [Member]

West Holdings Credit Agreement Tranche A [Member]

West Holdings Credit Agreement Tranche A [Member]

West Holdings Credit Agreement Tranche B [Member]

West Holdings Credit Agreement Tranche B [Member]

West Holdings PPA [Member]

West Holding Collateral Agent [Member]

West Holdings Working Capital Facility [Member]

West Holdings Working Capital Facility [Member]

Marsh Landing Tranche A [Member]

Marsh Landing Tranche B [Member]

Kansas South [Member]

Borrego

NRG

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Subsequent Event [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Minimum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Maximum [Member]

Floating Rate Notes [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Construction Loans [Member]

Construction Loans [Member]

Cash Grant Loan [Member]

Cash Grant Loan [Member]

Cash Grant Loan [Member]

Cash Grant Loan [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Term Loan Facility [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Fixed Rate Notes

Fixed Rate Notes

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Bridge Loan [Member]

Bridge Loan [Member]

Revolving Credit Facility [Member]

Revolving Credit Facility [Member]

Fixed Rate Notes

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Bridge Loan [Member]

Revolving Credit Facility [Member]

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Non-affiliate

Letter of Support of Debt Service [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

High Desert Facility [Member]

Avra Valley

Avra Valley

Marsh Landing

Marsh Landing

Marsh Landing Tranche A due December 2017 [Member]

Marsh Landing Tranche A After December 2017 [Member]

Marsh Landing Tranche B due December 2017 [Member]

Marsh Landing Tranche B After December 2017 [Member]

NRG Yield Operating LLC [Member]

NRG Yield Operating LLC [Member]

Alpine

NRG West Holdings LLC [Member]

Kansas South [Member]

South Trent Wind LLC, due 2020

West Holdings Credit Agreement Tranche B [Member]

Alpine

NRG West Holdings LLC [Member]

South Trent Wind LLC, due 2020

West Holdings Credit Agreement Tranche B [Member]

LIBOR Floor [Member]

Bridge Loan [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

Floating Rate Notes [Member]

5.375% Senior Notes due in 2024 [Member]

5.375% Senior Notes due in 2024 [Member]

Long-term Debt Disclosure

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible Debt, Fair Value Disclosures

$324,000,000

$324,000,000

'

'

$0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible Debt

'

'

'

345,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt

'

'

'

'

'

58,000,000

'

'

1,999,000,000

1,783,000,000

80,000,000

'

'

'

'

'

464,000,000

473,000,000

'

'

'

'

170,000,000

221,000,000

'

166,000,000

'

'

63,000,000

68,000,000

'

'

'

'

124,000,000

127,000,000

'

'

'

512,000,000

57,000,000

53,000,000

7,000,000

'

'

22,000,000

'

'

35,000,000

35,000,000

38,000,000

'

'

21,000,000

'

'

77,000,000

78,000,000

'

'

'

'

66,000,000

69,000,000

'

62,000,000

63,000,000

'

'

43,000,000

44,000,000

'

'

24,000,000

24,000,000

'

31,000,000

32,000,000

2,000,000

2,000,000

'

'

'

'

1,675,000,000

1,783,000,000

'

460,000,000

'

60,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Lines of Credit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

164,000,000

'

'

62,000,000

'

'

'

11,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

29,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Repayments of Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

62,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit, Issued Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

4,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Power Generation Capacity (in MWs)

2,037

[1]

2,037

[1]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Period Payment is Due After Receipt of Cash Grant

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'10 days

'

'

'

'

'

'

'

'10 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Total long-term debt

1,880,000,000

1,880,000,000

'

'

1,569,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Variable rate basis

'3 month LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'3 month LIBOR

'LIBOR

'

'

'

'LIBOR

'

'LIBOR

'

'

'

'

'

'

'

'

'

'LIBOR

'3 month LIBOR

'3 month LIBOR

'

'

'

'

'

'LIBOR

'

'

'

'3 month LIBOR

'

'

'1 month LIBOR

'

'

'6 month LIBOR

'

'

'

'6 month LIBOR

'1 month LIBOR

'

'LIBOR

'

'

'LIBOR

'

'

'LIBOR

'

'

'LIBOR

'

'

'LIBOR

'

'

'

'LIBOR

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'3 month LIBOR

'3 month LIBOR

'

'

'

'3 month LIBOR

'

'

'

'3 month LIBOR

'3 month LIBOR

'3 month LIBOR

'3 month LIBOR

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Basis Spread on Variable Rate

'

'

'

'

'

'

'

'

'

'

'

2.50%

'

2.25%

'

'

'

'

'

2.75%

'

3.00%

'

'

'

'

'

'

'

'

'

2.00%

1.75%

'

'

'

'

'

'

'

'

'

2.50%

1.50%

'

2.50%

'

'

'

2.63%

'

2.63%

'

2.00%

'

'

'

'

'

2.50%

5.65%

'

'

'

2.25%

'

'

'

2.01%

'

'

'

2.75%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2.75%

3.00%

'

'

'

1.75%

'

'

'

1.75%

2.00%

1.88%

2.13%

'

'

1.75%

2.50%

'

2.63%

'

2.50%

2.88%

2.75%

'

Extinguishment of Debt, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

20,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Interest rate

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.95%

7.25%

'

'

'

5.15%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

600.00%

'

'

'

'

'

'

'

3.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

5.38%

'

'

'

'

'

'

'

'

'

Debt

'

'

'

'

1,783,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Issuance Cost

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

2,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Long-term Debt, Current Maturities

119,000,000

119,000,000

'

'

214,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum

'

'

'

'

'

'

'

'

'

'

'

'

5.15%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

540,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

12,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60,000,000

450,000,000

'

'

'

'

'

'

480,000,000

'

60,000,000

90,000,000

48,000,000

10,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Incremental Escalation On Basis Spread, Percentage

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.13%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

0.25%

'

0.13%

'

'

'

0.03%

Proceeds from Contributions from Parent

'

'

'

'

'

'

2,000,000

150,000,000

[2]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Face Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

13,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

3,000,000

'

34,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Convertible, Conversion Price

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$46.55

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Convertible, Conversion Ratio

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

21.4822

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Debt Instrument, Convertible, Carrying Amount of Equity Component

21,000,000

21,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt

23,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from Issuance of Senior Long-term Debt

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

500,000,000

'

'

'

'

'

'

'

'

'

'

Line of Credit Facility, Maximum Borrowing Capacity Available for Issuance of Letters of Credit

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

9,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Letters of Credit Outstanding, Amount

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

33,000,000

'

1,000,000

48,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Payments for (Proceeds from) Other Investing Activities

'

($11,000,000)

$0

[2]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$21,000,000

$30,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

[1]

Net capacity represents the maximum, or rated, generating capacity of the facility multiplied by the Company's percentage ownership in the facility as of June 30, 2014.

[2]

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

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended	6 Months Ended
In Millions, except Per Share data, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2014
Earnings Per Share [Abstract]	'	'
Net Income Attributable to NRG Yield, Inc.	$6	$10
Basic and Diluted Earnings per Class A Common Share	$0.26	$0.42
Weighted average number of Class A common shares outstanding	23	23
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	'	7

Changes_in_Capital_Structure_C

Changes in Capital Structure Changes in Capital Structure (USD $)	0 Months Ended	3 Months Ended		6 Months Ended			3 Months Ended	0 Months Ended
In Millions, except Share data, unless otherwise specified	Jan. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Jun. 30, 2014	Jul. 31, 2014	Jun. 30, 2014	Sep. 30, 2014	Jul. 22, 2013	Jul. 29, 2014
					Common Class A	Common Class A	Subsequent Event [Member]	Public Shareholders	Public Shareholders
								Common Class A	Subsequent Event [Member]
									Common Class A
Class of Stock [Line Items]	'	'	'	'	'	'	'	'	'
Entity Common Stock, Shares Outstanding	'	'	'	'	34,586,250	22,511,250	'	'	'
Dividends	$0.33	$0.35	$0.33	$0.68	'	'	$0.37	'	'
Sale of Stock, Number of Shares Issued in Transaction	'	'	'	'	'	'	'	22,511,250	12,075,000
Payments for Underwriting Expense	'	'	'	'	'	'	'	'	$630

Segment_Reporting_Details

Segment Reporting (Details) (USD $)	3 Months Ended			6 Months Ended
In Millions, unless otherwise specified	Jun. 30, 2014	Jun. 30, 2013		Jun. 30, 2014	Jun. 30, 2013		Dec. 31, 2013
Segment Reporting	'	'		'	'		'
Operating revenues	$134	$82	[1]	$274	$135	[1]	'
Cost of operations	45	32		105	61		'
Depreciation and amortization	36	10	[1]	60	20	[1]	'
General and administrative b affiliate	2	2	[1]	4	4	[1]	'
Operating Income	51	38	[1]	105	50	[1]	'
Equity in earnings of unconsolidated affiliates	14	2	[1]	15	6	[1]	'
Interest Expense	-29	-6	[1]	-56	-11	[1]	'
Other Income	'	1		1	1		'
Income/(loss) before income taxes	36	35	[1]	65	46	[1]	'
Income Tax Expense (Benefit)	2	0	[1]	5	0	[1]	'
Net income/(loss)	34	35	[1]	60	46	[1]	'
Total assets	3,236	'		3,236	'		3,238	[1]
Conventional Generation	'	'		'	'		'
Segment Reporting	'	'		'	'		'
Operating revenues	61	20		117	20		'
Cost of operations	12	3		22	3		'
Depreciation and amortization	24	2		36	2		'
Operating Income	25	15		59	15		'
Equity in earnings of unconsolidated affiliates	4	3		7	7		'
Interest Expense	-11	-3		-22	-3		'
Other Income	'	1		0	1		'
Income/(loss) before income taxes	18	16		44	20		'
Net income/(loss)	18	16		44	20		'
Total assets	1,535	'		1,535	'		'
Renewables	'	'		'	'		'
Segment Reporting	'	'		'	'		'
Operating revenues	30	26		49	42		'
Cost of operations	3	2		7	5		'
Depreciation and amortization	7	5		15	11		'
Operating Income	20	19		27	26		'
Equity in earnings of unconsolidated affiliates	10	-1		8	-1		'
Interest Expense	-11	-1		-22	-4		'
Other Income	'	0		1	0		'
Income/(loss) before income taxes	19	17		14	21		'
Net income/(loss)	19	17		14	21		'
Total assets	905	'		905	'		'
Thermal	'	'		'	'		'
Segment Reporting	'	'		'	'		'
Operating revenues	43	36		108	73		'
Cost of operations	30	27		76	53		'
Depreciation and amortization	5	3		9	7		'
Operating Income	8	6		23	13		'
Equity in earnings of unconsolidated affiliates	0	0		0	0		'
Interest Expense	-2	-2		-4	-4		'
Other Income	'	0		0	0		'
Income/(loss) before income taxes	6	4		19	9		'
Net income/(loss)	6	4		19	9		'
Total assets	362	'		362	'		'
Corporate	'	'		'	'		'
Segment Reporting	'	'		'	'		'
Operating revenues	0	0		0	0		'
Cost of operations	0	0		0	0		'
Depreciation and amortization	0	0		0	0		'
Operating Income	-2	-2		-4	-4		'
Equity in earnings of unconsolidated affiliates	0	0		0	0		'
Interest Expense	-5	0		-8	0		'
Other Income	'	0		0	0		'
Income/(loss) before income taxes	-7	-2		-12	-4		'
Net income/(loss)	-9	-2		-17	-4		'
Total assets	434	'		434	'		'
Affiliate	'	'		'	'		'
Segment Reporting	'	'		'	'		'
General and administrative b affiliate	2	2		4	4		'
Affiliate | Conventional Generation	'	'		'	'		'
Segment Reporting	'	'		'	'		'
General and administrative b affiliate	0	0		0	0		'
Affiliate | Renewables	'	'		'	'		'
Segment Reporting	'	'		'	'		'
General and administrative b affiliate	0	0		0	0		'
Affiliate | Thermal	'	'		'	'		'
Segment Reporting	'	'		'	'		'
General and administrative b affiliate	0	0		0	0		'
Affiliate | Corporate	'	'		'	'		'
Segment Reporting	'	'		'	'		'
General and administrative b affiliate	$2	$2		$4	$4		'
[1]	Retrospectively adjusted as discussed in Note 1, Nature of Business.

Income_Taxes_Details

Income Taxes (Details) (USD $)

3 Months Ended

6 Months Ended

12 Months Ended

0 Months Ended

6 Months Ended

0 Months Ended

3 Months Ended

6 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Dec. 31, 2013

Jul. 22, 2013

Jun. 30, 2014

Jul. 22, 2013

Jun. 30, 2014

Jun. 30, 2014

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

NRG Yield LLC

NRG Yield, Inc.

NRG Yield, Inc.

NRG

NRG

NRG

Income Taxes

'

'

'

'

'

'

'

'

'

'

Income before income taxes

$36

$35

[1]

$65

$46

[1]

'

'

'

'

'

'

Income tax expense

2

0

[1]

5

0

[1]

'

'

'

'

'

'

Effective tax rate (as a percent)

5.60%

0.00%

7.70%

0.00%

'

'

'

'

'

'

Statutory income tax rate (as a percent)

35.00%

'

'

'

'

'

'

'

'

'

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

'

'

'

'

'

34.50%

34.50%

65.50%

65.50%

65.50%

Adjustment to additional paid-in capital for tax basis differences

'

'

$171

'

$153

'

'

'

'

'

[1]

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

Related_Party_Transactions_Det

Related Party Transactions (Details) (USD $)

3 Months Ended

6 Months Ended

3 Months Ended

3 Months Ended

In Millions, unless otherwise specified

Jun. 30, 2014

Sep. 30, 2013

Jun. 30, 2013

Jun. 30, 2014

Jun. 30, 2013

Jun. 30, 2014

Dec. 31, 2013

Sep. 30, 2013

Mar. 31, 2014

Dec. 31, 2013

Management Services Agreement with NRG

NRG Solar Alpine LLC [Member]

NRG Yield [Member]

NRG Repowering Holdings LLC [Member]

NRG Repowering Holdings LLC [Member]

Related Party Transaction

'

'

'

'

'

'

'

'

'

'

Capital contributions percentage

'

100.00%

'

'

'

'

'

48.95%

'

'

Management Services Fee, Annual

'

'

'

'

'

$1

'

'

'

'

General and administrative b affiliate

2

'

2

[1]

4

4

[1]

'

'

'

'

'

Due to Affiliate

'

'

'

'

'

'

14

'

'

'

Payments

'

'

'

'

'

'

'

'

'

18

Receipt of payments

'

'

'

'

'

'

'

'

$11

'

[1]

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

Environmental_Matters_Details

Environmental Matters (Details) (USD $)	6 Months Ended
	Jun. 30, 2014
Environmental Remediation Obligations [Abstract]	'
Litigation Settlement, Amount	$123,000