Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 115	$ 170
Receivables, less allowances of $67 and $75 for uncollectible accounts at respective dates	797	762
Accrued unbilled revenue	403	550
Inventory	351	340
Prepaid taxes	26	22
Derivative assets	111	129
Margin and collateral deposits	10	8
Regulatory assets	672	572
Other current assets	185	119
Total current assets	2,670	2,672
Nuclear decommissioning trusts	4,246	4,048
Investments in unconsolidated affiliates	2	2
Other investments	199	184
Total investments	4,447	4,234
Utility property, plant and equipment, less accumulated depreciation of $7,662 and $7,424 at respective dates	30,673	30,200
Nonutility property, plant and equipment, less accumulated depreciation of $126 and $123 at respective dates	72	73
Total property, plant and equipment	30,745	30,273
Derivative assets	81	85
Restricted deposits	4	4
Regulatory assets	6,518	6,422
Other long-term assets	690	704
Total long-term assets	7,293	7,215
Total assets	45,155	44,394
LIABILITIES AND EQUITY
Short-term debt	420	175
Current portion of long-term debt	800	0
Accounts payable	1,100	1,423
Accrued taxes	134	61
Accrued interest	126	176
Customer deposits	196	193
Derivative liabilities	107	126
Regulatory liabilities	443	536
Deferred income taxes	174	64
Other current liabilities	779	990
Total current liabilities	4,279	3,744
Long-term debt	8,829	9,231
Deferred income taxes	6,289	6,127
Deferred investment tax credits	103	104
Customer advances	150	149
Derivative liabilities	1,014	939
Pensions and benefits	2,610	2,614
Asset retirement obligations	2,824	2,782
Regulatory liabilities	5,470	5,214
Other deferred credits and other long-term liabilities	2,278	2,299
Total deferred credits and other liabilities	20,738	20,228
Total liabilities	33,846	33,203
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)	2,380	2,373
Accumulated other comprehensive loss	(87)	(87)
Retained earnings	7,262	7,146
Total common shareholders' equity	9,555	9,432
Preferred and preference stock of utility	1,754	1,759
Total noncontrolling interests	1,754	1,759
Total equity	11,309	11,191
Total liabilities and equity	45,155	44,394
Southern California Edison
ASSETS
Cash and cash equivalents	27	45
Receivables, less allowances of $67 and $75 for uncollectible accounts at respective dates	754	755
Accrued unbilled revenue	403	550
Inventory	351	340
Prepaid taxes	30	48
Derivative assets	111	129
Regulatory assets	672	572
Other current assets	194	123
Total current assets	2,542	2,562
Nuclear decommissioning trusts	4,246	4,048
Other investments	125	116
Total investments	4,371	4,164
Utility property, plant and equipment, less accumulated depreciation of $7,662 and $7,424 at respective dates	30,673	30,200
Nonutility property, plant and equipment, less accumulated depreciation of $126 and $123 at respective dates	70	70
Total property, plant and equipment	30,743	30,270
Derivative assets	81	85
Regulatory assets	6,518	6,422
Other long-term assets	537	531
Total long-term assets	7,136	7,038
Total assets	44,792	44,034
LIABILITIES AND EQUITY
Short-term debt	404	175
Current portion of long-term debt	800
Accounts payable	1,069	1,297
Accrued taxes	131	72
Accrued interest	125	172
Customer deposits	196	193
Derivative liabilities	107	126
Regulatory liabilities	443	536
Deferred income taxes	174	81
Other current liabilities	654	861
Total current liabilities	4,103	3,513
Long-term debt	8,427	8,828
Deferred income taxes	6,781	6,669
Deferred investment tax credits	103	104
Customer advances	150	149
Derivative liabilities	1,014	939
Pensions and benefits	2,234	2,245
Asset retirement obligations	2,824	2,782
Regulatory liabilities	5,470	5,214
Other deferred credits and other long-term liabilities	1,844	1,848
Total deferred credits and other liabilities	20,420	19,950
Total liabilities	32,950	32,291
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	579	581
Accumulated other comprehensive loss	(32)	(29)
Retained earnings	7,332	7,228
Total common shareholders' equity	10,047	9,948
Preferred and preference stock of utility	1,795	1,795
Total equity	11,842	11,743
Total liabilities and equity	$ 44,792	$ 44,034