CONSOLIDATED BALANCE SHEETS (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 1,009	$ 1,300
Accounts receivable-trade	107	107
Receivables from affiliates	5	4
Inventory	232	274
Derivative assets	46	40
Restricted cash and cash equivalents	110	103
Margin and collateral deposits	59	41
Prepaid expenses and other	90	72
Total current assets	1,658	1,941
Investments in Unconsolidated Affiliates	529	523
Property, Plant and Equipment, less accumulated depreciation of $1,428 and $1,295 at respective dates	4,463	4,472
Other Assets
Deferred financing costs	68	71
Long-term derivative assets	52	59
Restricted deposits	95	48
Rent payments in excess of levelized rent expense under plant operating leases	798	760
Deferred taxes	349	205
Other long-term assets	242	244
Total other assets	1,604	1,387
Total Assets	8,254	8,323
Current Liabilities
Accounts payable	70	99
Payables to affiliates	91	188
Accrued liabilities	133	168
Derivative liabilities	0	1
Interest payable	30	33
Deferred taxes	26	2
Current portion of long-term debt	566	57
Short-term debt	9	0
Total current liabilities	925	548
Long-term debt net of current portion	4,430	4,855
Deferred revenues	517	530
Long-term derivative liabilities	114	90
Other long-term liabilities	606	636
Total Liabilities	6,592	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	1,309	1,327
Retained earnings	160	365
Accumulated other comprehensive loss	(115)	(94)
Total Edison Mission Energy common shareholder's equity	1,418	1,662
Noncontrolling Interests	244	2
Total Equity	1,662	1,664
Total Liabilities and Equity	$ 8,254	$ 8,323