CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Current Assets
Cash and cash equivalents	$ 1,300	$ 1,075
Accounts receivable-trade	107	170
Receivables from affiliates	4	192
Inventory	274	236
Derivative assets	40	46
Restricted cash and cash equivalents	103	2
Margin and collateral deposits	41	59
Prepaid expenses and other	72	79
Total current assets	1,941	1,859
Investments in Unconsolidated Affiliates	523	557
Property, Plant and Equipment, less accumulated depreciation of $1,295 and $1,759 at respective dates	4,472	5,332
Other Assets
Deferred financing costs	71	54
Long-term derivative assets	59	70
Restricted deposits	48	44
Rent payments in excess of levelized rent expense under plant operating leases	760	1,187
Deferred taxes	205	0
Other long-term assets	244	218
Total other assets	1,387	1,573
Total Assets	8,323	9,321
Current Liabilities
Accounts payable	99	90
Payables to affiliates	188	18
Accrued liabilities	168	201
Derivative liabilities	1	6
Interest payable	33	31
Deferred taxes	2	34
Current portion of long-term debt	57	48
Short-term debt	0	96
Total current liabilities	548	524
Long-term debt net of current portion	4,855	4,342
Deferred taxes and tax credits	0	836
Deferred revenues	530	160
Long-term derivative liabilities	90	19
Other long-term liabilities	636	619
Total Liabilities	6,659	6,500
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	1,327	1,336
Retained earnings	365	1,448
Accumulated other comprehensive loss	(94)	(31)
Total Edison Mission Energy common shareholder's equity	1,662	2,817
Noncontrolling Interests	2	4
Total Equity	1,664	2,821
Total Liabilities and Equity	$ 8,323	$ 9,321