CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Net loss	$ (448)	$ (162)	$ (614)	$ (348)
Pension and postretirement benefits other than pensions:
Unamortized prior service cost on terminated plan, net of tax	0	0	(2)	0
Net gain adjustment, net of tax	0	0	0	1
Amortization of net loss and prior service adjustment included in expense, net of tax	1	2	3	3
Unrealized gains (losses) on derivatives qualified as cash flow hedges:
Unrealized holding gains (losses) arising during periods, net of income tax expense (benefit)	(4)	(16)	23	(19)
Reclassification adjustments included in net loss, net of income tax expense (benefit)	3	1	5	(19)
Other comprehensive income (loss), net of tax	0	(13)	29	(34)
Comprehensive Loss	(448)	(175)	(585)	(382)
Comprehensive Income Attributable to Noncontrolling Interests	(7)	(5)	(21)	(12)
Comprehensive Loss Attributable to Edison Mission Energy Common Shareholder	(455)	(180)	(606)	(394)
Midwest Generation LLC
Net loss	(471)	(12)	(619)	(63)
Other comprehensive income (loss), net of tax
Valuation allowance on deferred tax asset	0	(11)	0	(11)
Pension and postretirement benefits other than pensions:
Amortization of net loss and prior service adjustment included in expense, net of tax	1	1	2	2
Unrealized gains (losses) on derivatives qualified as cash flow hedges:
Unrealized holding gains (losses) arising during periods, net of income tax expense (benefit)	1	(10)	(1)	2
Reclassification adjustments included in net loss, net of income tax expense (benefit)	1	0	2	(19)
Other comprehensive income (loss), net of tax	3	(20)	3	(26)
Comprehensive Loss Attributable to Edison Mission Energy Common Shareholder	$ (468)	$ (32)	$ (616)	$ (89)