CONSOLIDATED STATEMENTS OF COMPREHENSIVE LOSS (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Net Loss	$ (104)	$ (32)	$ (186)	$ (52)
Pension and postretirement benefits other than pensions
Net gain adjustment, net of tax	0	0	1	0
Amortization of net loss and prior service adjustment included in expense, net of tax	0	0	1	1
Unrealized losses on derivatives qualified as cash flow hedges
Unrealized holding losses arising during periods, net of income tax benefit of $19 and $9 for the three months and $2 and $5 for the six months ended June 30, 2012 and 2011, respectively	(28)	(14)	(3)	(8)
Reclassification adjustments included in net loss, net of income tax benefit of $6 and $6 for the three months and $13 and $12 for the six months ended June 30, 2012 and 2011, respectively	(9)	(7)	(20)	(17)
Other comprehensive loss, net of tax	(37)	(21)	(21)	(24)
Comprehensive Loss	(141)	(53)	(207)	(76)
Comprehensive Income Attributable to Noncontrolling Interests	(5)	0	(7)	0
Comprehensive Loss Attributable to Edison Mission Energy Common Shareholder	$ (146)	$ (53)	$ (214)	$ (76)