Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2015

Accounting Policies [Abstract]

Schedule of Change in Noncontrolling Interest

Noncontrolling Interest

The following table reflects the changes in NRG's noncontrolling interest balance:

	(In millions)
Balance as of December 31, 2014	$	1,914
Sale of assets to NRG Yield, Inc.	(27		)
Distributions to noncontrolling interest	(24		)
Non-cash increase to noncontrolling interest	14
Comprehensive loss attributable to noncontrolling interest	(29		)
Balance as of March 31, 2015	$	1,848