CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 1,307	$ 1,300
Accounts receivable-trade	75	107
Receivables from affiliates	8	4
Inventory	240	274
Derivative assets	39	40
Restricted cash and cash equivalents	187	103
Margin and collateral deposits	76	41
Prepaid expenses and other	60	72
Total current assets	1,992	1,941
Investments in Unconsolidated Affiliates	520	523
Property, Plant and Equipment, less accumulated depreciation of $1,362 and $1,295 at respective dates	4,472	4,472
Other Assets
Deferred financing costs	74	71
Long-term derivative assets	52	59
Restricted deposits	57	48
Rent payments in excess of levelized rent expense under plant operating leases	798	760
Deferred taxes	183	205
Other long-term assets	237	244
Total other assets	1,401	1,387
Total Assets	8,385	8,323
Current Liabilities
Accounts payable	67	99
Payables to affiliates	146	188
Accrued liabilities	115	168
Derivative liabilities	1	1
Interest payable	102	33
Deferred taxes	2	2
Current portion of long-term debt	61	57
Total current liabilities	494	548
Long-term debt net of current portion	4,902	4,855
Deferred revenues	524	530
Long-term derivative liabilities	79	90
Other long-term liabilities	599	636
Total Liabilities	6,598	6,659
Commitments and Contingencies (Notes 5, 6, 9 and 10)
Equity
Common stock, par value $0.01 per share (10,000 shares authorized; 100 shares issued and outstanding at each date)	64	64
Additional paid-in capital	1,279	1,327
Retained earnings	276	365
Accumulated other comprehensive loss	(78)	(94)
Total Edison Mission Energy common shareholder's equity	1,541	1,662
Noncontrolling Interests	246	2
Total Equity	1,787	1,664
Total Liabilities and Equity	$ 8,385	$ 8,323