CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Net Income (Loss)	$ 33	$ 113	$ (19)	$ 177
Pension and postretirement benefits other than pensions
Amortization of net loss included in expenses, net of tax	1		2
Unrealized gains (losses) on derivatives qualified as cash flow hedges
Unrealized holding gains (losses) arising during period, net of income tax expense (benefit) of $(19) and $29 for the three months and $(24) and $41 for the nine months ended September 30, 2011 and 2010, respectively	(30)	43	(38)	61
Reclassification adjustments included in net income (loss), net of income tax benefit of $0 and $5 for the three months and $12 and $54 for the nine months ended September 30, 2011 and 2010, respectively		(7)	(17)	(80)
Other comprehensive income (loss)	(29)	36	(53)	(19)
Comprehensive Income (Loss)	4	149	(72)	158
Comprehensive Loss Attributable to Noncontrolling Interests	1		1
Comprehensive Income (Loss) Attributable to Edison Mission Energy Common Shareholder	$ 5	$ 149	$ (71)	$ 158