CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Current Assets
Cash and cash equivalents	$ 1,176	$ 888
Accounts receivable-trade	83	73
Receivables from affiliates	3	8
Inventory	114	175
Derivative assets	44	53
Restricted cash and cash equivalents	7	11
Margin and collateral deposits	71	61
Prepaid expenses and other	37	54
Total current assets	1,535	1,323
Investments in Unconsolidated Affiliates	513	534
Net property, plant and equipment	3,877	4,516
Other Assets
Deferred financing costs	34	44
Long-term derivative assets	18	37
Restricted deposits	102	102
Rent payments in excess of levelized rent expense under plant operating leases	791	836
Other long-term assets	103	128
Total other assets	1,048	1,147
Total Assets	6,973	7,520
Current Liabilities
Accounts payable	35	29
Payables to affiliates	16	34
Accrued liabilities and other	149	67
Interest payable	2	1
Current portion of long-term debt	323	307
Short-term debt	4	382
Total current liabilities	529	820
Liabilities subject to compromise	4,015	3,959
Long-term debt net of current portion	1,171	749
Deferred taxes and tax credits	58	81
Deferred revenues	506	533
Long-term derivative liabilities	56	118
Other long-term liabilities	377	528
Total Liabilities	6,712	6,788
Commitments and Contingencies (Notes 5, 6, 9 and 10)
Equity
Common stock and membership interests	64	64
Additional paid-in capital	1,137	1,095
Retained earnings (deficit)	(1,261)	(577)
Accumulated other comprehensive loss	(61)	(138)
Total Edison Mission Energy common shareholder's equity	(121)	444
Noncontrolling Interests	382	288
Total Equity	261	732
Total Liabilities and Equity	6,973	7,520
Midwest Generation LLC [Member]
Current Assets
Cash and cash equivalents	118	95
Receivables from affiliates	47	40
Inventory	94	165
Derivative assets	0	2
Prepaid expenses and other	14	20
Total current assets	273	322
Net property, plant and equipment	1,523	2,078
Other Assets
Other long-term assets	10	28
Total Assets	1,806	2,428
Current Liabilities
Accounts payable	9	10
Payables to affiliates	6	3
Accrued liabilities and other	73	18
Interest payable	3	1
Derivative liabilities	0	3
Current portion of lease financings	0	6
Total current liabilities	91	41
Liabilities subject to compromise	540	529
Other long-term liabilities	113	192
Total Liabilities	744	762
Commitments and Contingencies (Notes 5, 6, 9 and 10)
Equity
Common stock and membership interests	0	0
Additional paid-in capital	3,405	3,405
Retained earnings (deficit)	(2,322)	(1,689)
Accumulated other comprehensive loss	(21)	(50)
Total Equity	1,062	1,666
Total Liabilities and Equity	$ 1,806	$ 2,428