Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 1,469	$ 1,389
Receivables, less allowances of $75 and $85 for uncollectible accounts at respective dates	908	931
Accrued unbilled revenue	519	442
Inventory	624	568
Prepaid taxes	88	390
Derivative assets	106	133
Restricted cash and cash equivalents	103	2
Margin and collateral deposits	58	65
Regulatory assets	494	378
Other current assets	115	124
Total current assets	4,484	4,422
Nuclear decommissioning trusts	3,592	3,480
Investments in unconsolidated affiliates	525	559
Other investments	211	223
Total investments	4,328	4,262
Utility property, plant and equipment, less accumulated depreciation of $6,894 and $6,319 at respective dates	27,569	24,778
Competitive power generation and other property, plant and equipment, less accumulated depreciation of $1,408 and $1,865 at respective dates	4,547	5,406
Total property, plant and equipment	32,116	30,184
Derivative assets	128	437
Restricted deposits	51	47
Rent payments in excess of levelized rent expense under plant operating leases	760	1,187
Regulatory assets	5,466	4,347
Other long-term assets	706	644
Total long-term assets	7,111	6,662
Total assets	48,039	45,530
LIABILITIES AND EQUITY
Short-term debt	429	115
Current portion of long-term debt	57	48
Accounts payable	1,419	1,362
Accrued taxes	52	52
Accrued interest	205	205
Customer deposits	199	217
Derivative liabilities	268	217
Regulatory liabilities	670	738
Other current liabilities	1,049	998
Total current liabilities	4,348	3,952
Long-term debt	13,689	12,371
Deferred income taxes	5,396	5,625
Deferred investment tax credits	89	122
Customer advances	138	112
Derivative liabilities	547	468
Pensions and benefits	2,912	2,260
Asset retirement obligations	2,688	2,561
Regulatory liabilities	4,670	4,524
Other deferred credits and other long-term liabilities	2,476	2,041
Total deferred credits and other liabilities	18,916	17,713
Total liabilities	36,953	34,036
Commitments and contingencies (Note 9)
Common stock, no par value (800,000,000 shares authorized; 325,811,206 shares issued and outstanding at each date)	2,360	2,331
Accumulated other comprehensive loss	(139)	(76)
Retained earnings	7,834	8,328
Total Edison International's common shareholders' equity	10,055	10,583
Preferred and preference stock of utility	1,029	907
Other noncontrolling interests	2	4
Total noncontrolling interests	1,031	911
Total equity	11,086	11,494
Total liabilities and equity	$ 48,039	$ 45,530