Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Assets [Abstract]
Cash and cash equivalents	$ 137	$ 161
Receivables, less allowances for uncollectible accounts	649	771
Accrued unbilled revenue	512	565
Inventory	268	267
Derivative assets	65	79
Regulatory assets	538	560
Other current assets	258	251
Total current assets	2,427	2,654
Nuclear decommissioning trusts	4,290	4,331
Other investments	208	203
Total investments	4,498	4,534
Utility property, plant and equipment, less accumulated depreciation and amortization	35,323	34,945
Nonutility property, plant and equipment, less accumulated depreciation	141	140
Total property, plant and equipment	35,464	35,085
Derivative assets	78	84
Regulatory assets	7,628	7,512
Other long-term assets	364	360
Total long-term assets	8,070	7,956
Total assets	50,459	50,229
LIABILITIES AND EQUITY
Short-term debt	363	695
Current portion of long-term debt	295	295
Accounts payable	938	1,310
Accrued taxes	139	72
Customer deposits	253	242
Derivative liabilities	232	218
Regulatory liabilities	1,157	1,128
Other current liabilities	856	967
Total current liabilities	4,233	4,927
Long-term debt	11,243	10,883
Deferred income taxes and credits	7,699	7,480
Derivative liabilities	1,136	1,100
Pensions and benefits	1,771	1,759
Asset retirement obligations	2,597	2,764
Regulatory liabilities	5,920	5,676
Other deferred credits and other long-term liabilities	2,225	2,246
Total deferred credits and other liabilities	21,348	21,025
Total liabilities	$ 36,824	$ 36,835
Commitments and contingencies (Note 11)
Redeemable noncontrolling interest	$ 4	$ 6
Common stock, no par value	2,491	2,484
Accumulated other comprehensive loss	(54)	(56)
Retained earnings	9,002	8,940
Total common shareholders' equity	11,439	11,368
Noncontrolling interests – preferred and preference stock of SCE	2,192	2,020
Total equity	13,631	13,388
Total liabilities and equity	50,459	50,229
Southern California Edison
Assets [Abstract]
Cash and cash equivalents	21	26
Receivables, less allowances for uncollectible accounts	624	724
Accrued unbilled revenue	511	564
Inventory	251	256
Derivative assets	65	79
Regulatory assets	538	560
Other current assets	233	234
Total current assets	2,243	2,443
Nuclear decommissioning trusts	4,290	4,331
Other investments	173	168
Total investments	4,463	4,499
Utility property, plant and equipment, less accumulated depreciation and amortization	35,323	34,945
Nonutility property, plant and equipment, less accumulated depreciation	73	73
Total property, plant and equipment	35,396	35,018
Derivative assets	78	84
Regulatory assets	7,628	7,512
Other long-term assets	239	239
Total long-term assets	7,945	7,835
Total assets	50,047	49,795
LIABILITIES AND EQUITY
Short-term debt	101	49
Current portion of long-term debt	79	79
Accounts payable	935	1,299
Accrued taxes	105	46
Customer deposits	253	242
Derivative liabilities	232	218
Regulatory liabilities	1,157	1,128
Other current liabilities	662	760
Total current liabilities	3,524	3,821
Long-term debt	10,422	10,460
Deferred income taxes and credits	9,297	9,073
Derivative liabilities	1,134	1,100
Pensions and benefits	1,292	1,284
Asset retirement obligations	2,595	2,762
Regulatory liabilities	5,920	5,676
Other deferred credits and other long-term liabilities	1,934	1,947
Total deferred credits and other liabilities	22,172	21,842
Total liabilities	$ 36,118	$ 36,123
Commitments and contingencies (Note 11)
Common stock, no par value	$ 2,168	$ 2,168
Additional paid-in capital	653	652
Accumulated other comprehensive loss	(21)	(22)
Retained earnings	8,884	8,804
Total common shareholders' equity	11,684	11,602
Noncontrolling interests – preferred and preference stock of SCE	2,245	2,070
Total equity	13,929	13,672
Total liabilities and equity	$ 50,047	$ 49,795