Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2015	Dec. 31, 2014
Assets [Abstract]
Cash and cash equivalents	$ 134	$ 132
Receivables, less allowances for uncollectible accounts	1,211	790
Accrued unbilled revenue	1,025	632
Inventory	270	281
Derivative assets	81	102
Regulatory assets	473	1,254
Deferred income taxes	152	452
Other current assets	446	376
Total current assets	3,792	4,019
Nuclear decommissioning trusts	4,388	4,799
Other investments	208	207
Total investments	4,596	5,006
Utility property, plant and equipment, less accumulated depreciation and amortization	34,062	32,859
Nonutility property, plant and equipment, less accumulated depreciation	140	122
Total property, plant and equipment	34,202	32,981
Derivative assets	188	219
Regulatory assets	8,121	7,612
Other long-term assets	371	349
Total long-term assets	8,680	8,180
Total assets	51,270	50,186
LIABILITIES AND EQUITY
Short-term debt	1,154	1,291
Current portion of long-term debt	295	504
Accounts payable	1,330	1,580
Accrued taxes	80	81
Customer deposits	235	221
Derivative liabilities	207	196
Regulatory liabilities	888	401
Other current liabilities	1,050	1,205
Total current liabilities	5,239	5,479
Long-term debt	10,957	10,234
Deferred income taxes and credits	7,698	7,313
Derivative liabilities	1,167	1,052
Pensions and benefits	2,175	2,155
Asset retirement obligations	2,822	2,821
Regulatory liabilities	5,265	5,889
Other deferred credits and other long-term liabilities	2,316	2,255
Total deferred credits and other liabilities	21,443	21,485
Total liabilities	$ 37,639	$ 37,198
Commitments and contingencies (Note 11)
Redeemable noncontrolling interest	$ 11	$ 6
Common stock, no par value	2,475	2,445
Accumulated other comprehensive loss	(55)	(58)
Retained earnings	9,180	8,573
Total common shareholders' equity	11,600	10,960
Noncontrolling interests – preferred and preference stock of utility	2,020	2,022
Total equity	13,620	12,982
Total liabilities and equity	51,270	50,186
Southern California Edison
Assets [Abstract]
Cash and cash equivalents	38	38
Receivables, less allowances for uncollectible accounts	1,185	749
Accrued unbilled revenue	1,025	632
Inventory	254	275
Derivative assets	81	102
Regulatory assets	473	1,254
Other current assets	448	390
Total current assets	3,504	3,440
Nuclear decommissioning trusts	4,388	4,799
Other investments	165	158
Total investments	4,553	4,957
Utility property, plant and equipment, less accumulated depreciation and amortization	34,062	32,859
Nonutility property, plant and equipment, less accumulated depreciation	75	69
Total property, plant and equipment	34,137	32,928
Derivative assets	188	219
Regulatory assets	8,121	7,612
Other long-term assets	319	300
Total long-term assets	8,628	8,131
Total assets	50,822	49,456
LIABILITIES AND EQUITY
Short-term debt	417	667
Current portion of long-term debt	79	300
Accounts payable	1,334	1,556
Accrued taxes	186	87
Customer deposits	235	221
Derivative liabilities	207	196
Regulatory liabilities	888	401
Deferred income taxes	100	209
Other current liabilities	1,040	1,183
Total current liabilities	4,486	4,820
Long-term debt	10,536	9,624
Deferred income taxes and credits	8,804	8,288
Derivative liabilities	1,166	1,052
Pensions and benefits	1,677	1,672
Asset retirement obligations	2,820	2,819
Regulatory liabilities	5,265	5,889
Other deferred credits and other long-term liabilities	2,144	2,010
Total deferred credits and other liabilities	21,876	21,730
Total liabilities	$ 36,898	$ 36,174
Commitments and contingencies (Note 11)
Common stock, no par value	$ 2,168	$ 2,168
Additional paid-in capital	654	618
Accumulated other comprehensive loss	(25)	(28)
Retained earnings	9,057	8,454
Total common shareholders' equity	11,854	11,212
Noncontrolling interests – preferred and preference stock of utility	2,070	2,070
Total equity	13,924	13,282
Total liabilities and equity	$ 50,822	$ 49,456