Consolidated Balance Sheets - USD ($) $ in Millions	Jun. 30, 2015	Dec. 31, 2014
Assets [Abstract]
Cash and cash equivalents	$ 139	$ 132
Receivables, less allowances for uncollectible accounts	768	790
Accrued unbilled revenue	853	632
Inventory	276	281
Derivative assets	79	102
Regulatory assets	1,066	1,254
Deferred income taxes	288	452
Other current assets	437	376
Total current assets	3,906	4,019
Nuclear decommissioning trusts	4,836	4,799
Other investments	210	207
Total investments	5,046	5,006
Utility property, plant and equipment, less accumulated depreciation and amortization	33,594	32,859
Nonutility property, plant and equipment, less accumulated depreciation	132	122
Total property, plant and equipment	33,726	32,981
Derivative assets	194	219
Regulatory assets	8,009	7,612
Other long-term assets	358	349
Total long-term assets	8,561	8,180
Total assets	51,239	50,186
LIABILITIES AND EQUITY
Short-term debt	1,415	1,291
Current portion of long-term debt	204	504
Accounts payable	1,294	1,580
Accrued taxes	36	81
Customer deposits	234	221
Derivative liabilities	162	196
Regulatory liabilities	454	401
Other current liabilities	1,037	1,205
Total current liabilities	4,836	5,479
Long-term debt	11,265	10,234
Deferred income taxes and credits	7,599	7,313
Derivative liabilities	1,155	1,052
Pensions and benefits	2,176	2,155
Asset retirement obligations	2,825	2,821
Regulatory liabilities	5,813	5,889
Other deferred credits and other long-term liabilities	2,220	2,255
Total deferred credits and other liabilities	21,788	21,485
Total liabilities	$ 37,889	$ 37,198
Commitments and contingencies (Note 11)
Redeemable noncontrolling interest	$ 3	$ 6
Common stock, no par value	2,472	2,445
Accumulated other comprehensive loss	(56)	(58)
Retained earnings	8,909	8,573
Total common shareholders' equity	11,325	10,960
Noncontrolling interests – preferred and preference stock of utility	2,022	2,022
Total equity	13,347	12,982
Total liabilities and equity	51,239	50,186
Southern California Edison
Assets [Abstract]
Cash and cash equivalents	53	38
Receivables, less allowances for uncollectible accounts	745	749
Accrued unbilled revenue	853	632
Inventory	261	275
Derivative assets	79	102
Regulatory assets	1,066	1,254
Other current assets	457	390
Total current assets	3,514	3,440
Nuclear decommissioning trusts	4,836	4,799
Other investments	167	158
Total investments	5,003	4,957
Utility property, plant and equipment, less accumulated depreciation and amortization	33,594	32,859
Nonutility property, plant and equipment, less accumulated depreciation	70	69
Total property, plant and equipment	33,664	32,928
Derivative assets	194	219
Regulatory assets	8,009	7,612
Other long-term assets	309	300
Total long-term assets	8,512	8,131
Total assets	50,693	49,456
LIABILITIES AND EQUITY
Short-term debt	851	667
Current portion of long-term debt	0	300
Accounts payable	1,286	1,556
Accrued taxes	25	87
Customer deposits	234	221
Derivative liabilities	162	196
Regulatory liabilities	454	401
Deferred income taxes	253	209
Other current liabilities	1,031	1,183
Total current liabilities	4,296	4,820
Long-term debt	10,654	9,624
Deferred income taxes and credits	8,673	8,288
Derivative liabilities	1,155	1,052
Pensions and benefits	1,677	1,672
Asset retirement obligations	2,824	2,819
Regulatory liabilities	5,813	5,889
Other deferred credits and other long-term liabilities	1,933	2,010
Total deferred credits and other liabilities	22,075	21,730
Total liabilities	$ 37,025	$ 36,174
Commitments and contingencies (Note 11)
Common stock, no par value	$ 2,168	$ 2,168
Additional paid-in capital	630	618
Accumulated other comprehensive loss	(26)	(28)
Retained earnings	8,826	8,454
Total common shareholders' equity	11,598	11,212
Noncontrolling interests – preferred and preference stock of utility	2,070	2,070
Total equity	13,668	13,282
Total liabilities and equity	$ 50,693	$ 49,456