Document and Entity Information	6 Months Ended
	Jun. 30, 2014	Jul. 31, 2014 Common Class A	Jun. 30, 2014 Common Class A	Jul. 31, 2014 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	Jun. 30, 2014
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