Income Taxes (GenOn, GenOn Americas Generation and GenOn Mid-Atlantic) (Tables)

9 Months Ended

Sep. 30, 2017

Income Tax Disclosure [Abstract]

Income tax (benefit)/provision

GenOn’s income tax expense consisted of the following:

	Three months ended September 30,						Nine months ended September 30,
(In millions except otherwise noted)	2017			2016			2017			2016
Income before income taxes	$	72		$	284		$	49		$	268
Income tax expense	—			21			7			20
Effective tax rate	—		%	7.4		%	14.3		%	7.5		%