Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 1,080	$ 1,390
Receivables, less allowances of$75 for uncollectible accounts at both dates	1,167	908
Accrued unbilled revenue	787	519
Inventory	508	519
Prepaid taxes	36	88
Derivative assets	76	106
Restricted cash and cash equivalents	116	103
Margin and collateral deposits	88	58
Regulatory assets	250	494
Deferred income taxes	231	0
Other current assets	94	92
Assets of discontinued operations	61	207
Total current assets	4,494	4,484
Nuclear decommissioning trusts	3,997	3,592
Investments in unconsolidated affiliates	544	525
Other investments	189	211
Total investments	4,730	4,328
Utility property, plant and equipment, less accumulated depreciation of $7,378 and $6,894 at respective dates	29,314	27,569
Competitive power generation and other property, plant and equipment, less accumulated depreciation of $1,616 and $1,408 at respective dates	4,544	4,547
Total property, plant and equipment	33,858	32,116
Derivative assets	117	131
Restricted deposits	89	25
Rent payments in excess of levelized rent expense under plant operating leases	855	760
Regulatory assets	5,677	5,466
Other long-term assets	725	684
Total long-term assets	7,463	7,066
Assets of discontinued operations	0	45
Total assets	50,545	48,039
LIABILITIES AND EQUITY
Short-term debt	429	429
Current portion of long-term debt	565	57
Accounts payable	1,257	1,397
Accrued taxes	105	52
Accrued interest	207	205
Customer deposits	193	199
Derivative liabilities	109	268
Regulatory liabilities	493	670
Deferred income taxes	0	91
Other current liabilities	855	953
Liabilities of discontinued operations	61	27
Total current liabilities	4,274	4,348
Long-term debt	13,708	13,689
Deferred income taxes	5,745	5,396
Deferred investment tax credits	108	89
Customer advances	149	138
Derivative liabilities	717	547
Pensions and benefits	2,884	2,912
Asset retirement obligations	2,804	2,680
Regulatory liabilities	5,249	4,670
Other deferred credits and other long-term liabilities	2,887	2,475
Total deferred credits and other liabilities	20,543	18,907
Liabilities of discontinued operations	0	9
Total liabilities	38,525	36,953
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)	2,385	2,360
Accumulated other comprehensive loss	(168)	(139)
Retained earnings	7,806	7,834
Total Edison International's common shareholders' equity	10,023	10,055
Preferred and preference stock of utility	1,759	1,029
Other noncontrolling interests	238	2
Total noncontrolling interests	1,997	1,031
Total equity	12,020	11,086
Total liabilities and equity	$ 50,545	$ 48,039