Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Assets [Abstract]
Cash and cash equivalents	$ 115	$ 132
Receivables, less allowances of $67 and $68 for uncollectible accounts at respective dates	752us-gaap_ReceivablesNetCurrent	790us-gaap_ReceivablesNetCurrent
Accrued unbilled revenue	636	632
Inventory	290us-gaap_InventoryNet	281us-gaap_InventoryNet
Derivative assets	94us-gaap_DerivativeAssetsCurrent	102us-gaap_DerivativeAssetsCurrent
Regulatory assets	1,152us-gaap_RegulatoryAssetsCurrent	1,254us-gaap_RegulatoryAssetsCurrent
Deferred income taxes	359	452
Other current assets	382us-gaap_OtherAssetsCurrent	376us-gaap_OtherAssetsCurrent
Total current assets	3,780us-gaap_AssetsCurrent	4,019us-gaap_AssetsCurrent
Nuclear decommissioning trusts	4,896	4,799
Other investments	217us-gaap_OtherLongTermInvestments	207us-gaap_OtherLongTermInvestments
Total investments	5,113eix_InvestmentsAndOtherAssets	5,006eix_InvestmentsAndOtherAssets
Utility property, plant and equipment, less accumulated depreciation and amortization of $8,372 and $8,132 at respective dates	33,249	32,859
Nonutility property, plant and equipment, less accumulated depreciation of $78 and $76 at respective dates dates (Edison International) and $76 and $75 at respective dates (Southern California Edison)	123	122
Total property, plant and equipment	33,372us-gaap_PropertyPlantAndEquipmentNet	32,981us-gaap_PropertyPlantAndEquipmentNet
Derivative assets	212us-gaap_DerivativeAssetsNoncurrent	219us-gaap_DerivativeAssetsNoncurrent
Regulatory assets	7,737us-gaap_RegulatoryAssetsNoncurrent	7,612us-gaap_RegulatoryAssetsNoncurrent
Other long-term assets	364us-gaap_OtherAssetsNoncurrent	349us-gaap_OtherAssetsNoncurrent
Total long-term assets	8,313eix_LongTermAssetsNoncurrent	8,180eix_LongTermAssetsNoncurrent
Total assets	50,578us-gaap_Assets	50,186us-gaap_Assets
LIABILITIES AND EQUITY
Short-term debt	936us-gaap_ShortTermBorrowings	1,291us-gaap_ShortTermBorrowings
Current portion of long-term debt	504us-gaap_LongTermDebtCurrent	504us-gaap_LongTermDebtCurrent
Accounts payable	1,203us-gaap_AccountsPayableCurrent	1,580us-gaap_AccountsPayableCurrent
Accrued taxes	118us-gaap_TaxesPayableCurrent	81us-gaap_TaxesPayableCurrent
Customer deposits	228us-gaap_CustomerDepositsCurrent	221us-gaap_CustomerDepositsCurrent
Derivative liabilities	185us-gaap_DerivativeLiabilitiesCurrent	196us-gaap_DerivativeLiabilitiesCurrent
Regulatory liabilities	435us-gaap_RegulatoryLiabilityCurrent	401us-gaap_RegulatoryLiabilityCurrent
Other current liabilities	962us-gaap_OtherLiabilitiesCurrent	1,205us-gaap_OtherLiabilitiesCurrent
Total current liabilities	4,571us-gaap_LiabilitiesCurrent	5,479us-gaap_LiabilitiesCurrent
Long-term debt	11,133us-gaap_LongTermDebtNoncurrent	10,234us-gaap_LongTermDebtNoncurrent
Deferred income taxes and credits	7,415	7,313
Derivative liabilities	1,107us-gaap_DerivativeLiabilitiesNoncurrent	1,052us-gaap_DerivativeLiabilitiesNoncurrent
Pensions and benefits	2,176	2,155
Asset retirement obligations	2,824	2,821
Regulatory liabilities	5,972us-gaap_RegulatoryLiabilityNoncurrent	5,889us-gaap_RegulatoryLiabilityNoncurrent
Other deferred credits and other long-term liabilities	2,279us-gaap_OtherLiabilitiesNoncurrent	2,255us-gaap_OtherLiabilitiesNoncurrent
Total deferred credits and other liabilities	21,773	21,485
Total liabilities	37,477us-gaap_Liabilities	37,198us-gaap_Liabilities
Commitments and contingencies (Note 11)
Redeemable noncontrolling interest	3	6
Common stock, no par value (800,000,000 shares authorized; 325,811,206 shares issued and outstanding at each date) and (560,000,000 shares authorized; 434,888,104 shares issued and outstanding at each date for SCE)	2,460	2,445
Accumulated other comprehensive loss	(59)	(58)
Retained earnings	8,675	8,573
Total common shareholders' equity	11,076eix_CommonShareholdersEquity	10,960eix_CommonShareholdersEquity
Noncontrolling interests - preferred and preference stock of utility	2,022	2,022
Total equity	13,098	12,982
Total liabilities and equity	50,578	50,186
Southern California Edison
Assets [Abstract]
Cash and cash equivalents	36	38
Receivables, less allowances of $67 and $68 for uncollectible accounts at respective dates	732	749
Accrued unbilled revenue	636	632
Inventory	282	275
Derivative assets	94	102
Regulatory assets	1,152	1,254
Other current assets	400	390
Total current assets	3,332	3,440
Nuclear decommissioning trusts	4,896	4,799
Other investments	164	158
Total investments	5,060	4,957
Utility property, plant and equipment, less accumulated depreciation and amortization of $8,372 and $8,132 at respective dates	33,249	32,859
Nonutility property, plant and equipment, less accumulated depreciation of $78 and $76 at respective dates dates (Edison International) and $76 and $75 at respective dates (Southern California Edison)	69	69
Total property, plant and equipment	33,318	32,928
Derivative assets	212	219
Regulatory assets	7,737	7,612
Other long-term assets	314	300
Total long-term assets	8,263	8,131
Total assets	49,973	49,456
LIABILITIES AND EQUITY
Short-term debt	297	667
Current portion of long-term debt	300	300
Accounts payable	1,211	1,556
Accrued taxes	133	87
Customer deposits	228	221
Derivative liabilities	185	196
Regulatory liabilities	435	401
Deferred income taxes	278	209
Other current liabilities	965	1,183
Total current liabilities	4,032	4,820
Long-term debt	10,523	9,624
Deferred income taxes and credits	8,390	8,288
Derivative liabilities	1,107	1,052
Pensions and benefits	1,681	1,672
Asset retirement obligations	2,823	2,819
Regulatory liabilities	5,972	5,889
Other deferred credits and other long-term liabilities	2,013	2,010
Total deferred credits and other liabilities	21,986	21,730
Total liabilities	36,541	36,174
Commitments and contingencies (Note 11)
Common stock, no par value (800,000,000 shares authorized; 325,811,206 shares issued and outstanding at each date) and (560,000,000 shares authorized; 434,888,104 shares issued and outstanding at each date for SCE)	2,168	2,168
Additional paid-in capital	631	618
Accumulated other comprehensive loss	(27)	(28)
Retained earnings	8,590	8,454
Total common shareholders' equity	11,362	11,212
Noncontrolling interests - preferred and preference stock of utility	2,070	2,070
Total equity	13,432	13,282
Total liabilities and equity	$ 49,973	$ 49,456

Excess of issue price over par or stated value of the entity's capital stock and amounts received from other transactions involving the entity's stock or stockholders. Includes adjustments to additional paid in capital. Some examples of such adjustments include recording the issuance of debt with a beneficial conversion feature and certain tax consequences of equity instruments awarded to employees, including preference stock costs.

No definition available.