Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 170	$ 1,469
Cash and cash equivalents	170	169
Receivables, less allowances of $75 for uncollectible accounts at both dates	762	768
Accrued unbilled revenue	550	519
Inventory	340	350
Prepaid taxes	22	88
Derivative assets	129	65
Margin and collateral deposits	8	17
Regulatory assets	572	494
Other current assets	119	73
Assets of discontinued operations	0	1,941
Total current assets	2,672	4,484
Nuclear decommissioning trusts	4,048	3,592
Investments in unconsolidated affiliates	2	2
Other investments	184	211
Total investments	4,234	3,805
Utility property, plant and equipment, less accumulated depreciation of $7,424 and $6,894 at respective dates	30,200	27,569
Nonutility property, plant and equipment, less accumulated depreciation of $123 and $113 at respective dates (and $117 and $107 at respective dates for SCE)	73	75
Total property, plant and equipment	30,273	27,644
Derivative assets	85	70
Restricted deposits	4	3
Regulatory assets	6,422	5,466
Other long-term assets	704	486
Total long-term assets	7,215	6,025
Assets of discontinued operations	0	6,081
Total assets	44,394	48,039
LIABILITIES AND EQUITY
Short-term debt	175	429
Accounts payable	1,423	1,321
Accrued taxes	61	49
Accrued interest	176	172
Customer deposits	193	199
Derivative liabilities	126	266
Regulatory liabilities	536	670
Deferred income taxes	64	89
Other current liabilities	990	794
Liabilities of discontinued operations	0	359
Total current liabilities	3,744	4,348
Long-term debt	9,231	8,834
Deferred income taxes	6,127	5,065
Deferred investment tax credits	104	84
Customer advances	149	138
Derivative liabilities	939	456
Pensions and benefits	2,614	2,715
Asset retirement obligations	2,782	2,610
Regulatory liabilities	5,214	4,670
Other deferred credits and other long-term liabilities	2,299	1,839
Total deferred credits and other liabilities	20,228	17,577
Liabilities of discontinued operations	0	6,194
Total liabilities	33,203	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) and (560,000 shares authorized; 434,888,104 shares issued and outstanding at each date for SCE)	2,373	2,360
Accumulated other comprehensive loss	(87)	(139)
Retained earnings	7,146	7,834
Total common shareholders' equity	9,432	10,055
Preferred and preference stock of utility	1,759	1,029
Other noncontrolling interests	0	2
Total noncontrolling interests	1,759	1,031
Total equity	11,191	11,086
Total liabilities and equity	44,394	48,039
Southern California Edison
ASSETS
Cash and cash equivalents	45	57
Receivables, less allowances of $75 for uncollectible accounts at both dates	755	760
Accrued unbilled revenue	550	519
Inventory	340	350
Prepaid taxes	48	278
Derivative assets	129	65
Regulatory assets	572	494
Other current assets	123	89
Total current assets	2,562	2,612
Nuclear decommissioning trusts	4,048	3,592
Other investments	116	93
Total investments	4,164	3,685
Utility property, plant and equipment, less accumulated depreciation of $7,424 and $6,894 at respective dates	30,200	27,569
Nonutility property, plant and equipment, less accumulated depreciation of $123 and $113 at respective dates (and $117 and $107 at respective dates for SCE)	70	73
Total property, plant and equipment	30,270	27,642
Derivative assets	85	70
Regulatory assets	6,422	5,815
Other long-term assets	531	491
Total long-term assets	7,038	6,376
Total assets	44,034	40,315
LIABILITIES AND EQUITY
Short-term debt	175	419
Accounts payable	1,297	1,319
Accrued taxes	72	49
Accrued interest	172	167
Customer deposits	193	199
Derivative liabilities	126	266
Regulatory liabilities	536	670
Deferred income taxes	81	89
Other current liabilities	861	670
Total current liabilities	3,513	3,848
Long-term debt	8,828	8,431
Deferred income taxes	6,669	5,781
Deferred investment tax credits	104	84
Customer advances	149	138
Derivative liabilities	939	805
Pensions and benefits	2,245	2,461
Asset retirement obligations	2,782	2,610
Regulatory liabilities	5,214	4,670
Other deferred credits and other long-term liabilities	1,848	1,529
Total deferred credits and other liabilities	19,950	18,078
Total liabilities	32,291	30,357
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) and (560,000 shares authorized; 434,888,104 shares issued and outstanding at each date for SCE)	2,168	2,168
Additional paid-in capital	581	596
Accumulated other comprehensive loss	(29)	(24)
Retained earnings	7,228	6,173
Total common shareholders' equity	9,948	8,913
Preferred and preference stock of utility	1,795	1,045
Total equity	11,743	9,958
Total liabilities and equity	$ 44,034	$ 40,315