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Schedule I - Condensed Financial Information of Parent (Details) (USD $) | 3 Months Ended | 12 Months Ended |
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Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 132,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  | $ 146,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  | $ 132,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 146,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | $ 170,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Other current assets | 376,000,000 us-gaap_OtherAssetsCurrent |  |  |  |  |  |  |  | 395,000,000 us-gaap_OtherAssetsCurrent |  |  |  |  |  |  |  | 376,000,000 us-gaap_OtherAssetsCurrent |  | 395,000,000 us-gaap_OtherAssetsCurrent |  |  |
Total current assets | 4,019,000,000 us-gaap_AssetsCurrent |  |  |  |  |  |  |  | 3,312,000,000 us-gaap_AssetsCurrent |  |  |  |  |  |  |  | 4,019,000,000 us-gaap_AssetsCurrent |  | 3,312,000,000 us-gaap_AssetsCurrent |  |  |
Other long-term assets | 349,000,000 us-gaap_OtherAssetsNoncurrent |  |  |  |  |  |  |  | 686,000,000 us-gaap_OtherAssetsNoncurrent |  |  |  |  |  |  |  | 349,000,000 us-gaap_OtherAssetsNoncurrent |  | 686,000,000 us-gaap_OtherAssetsNoncurrent |  |  |
Total assets | 50,186,000,000 us-gaap_Assets |  |  |  |  |  |  |  | 46,646,000,000 us-gaap_Assets |  |  |  |  |  |  |  | 50,186,000,000 us-gaap_Assets |  | 46,646,000,000 us-gaap_Assets |  |  |
Liabilities and equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt | 1,291,000,000 us-gaap_ShortTermBorrowings |  |  |  |  |  |  |  | 209,000,000 us-gaap_ShortTermBorrowings |  |  |  |  |  |  |  | 1,291,000,000 us-gaap_ShortTermBorrowings |  | 209,000,000 us-gaap_ShortTermBorrowings |  |  |
Current portion of long-term debt | 504,000,000 us-gaap_LongTermDebtCurrent |  |  |  |  |  |  |  | 601,000,000 us-gaap_LongTermDebtCurrent |  |  |  |  |  |  |  | 504,000,000 us-gaap_LongTermDebtCurrent |  | 601,000,000 us-gaap_LongTermDebtCurrent |  |  |
Other current liabilities | 1,205,000,000 us-gaap_OtherLiabilitiesCurrent |  |  |  |  |  |  |  | 1,186,000,000 us-gaap_OtherLiabilitiesCurrent |  |  |  |  |  |  |  | 1,205,000,000 us-gaap_OtherLiabilitiesCurrent |  | 1,186,000,000 us-gaap_OtherLiabilitiesCurrent |  |  |
Total current liabilities | 5,479,000,000 us-gaap_LiabilitiesCurrent |  |  |  |  |  |  |  | 4,881,000,000 us-gaap_LiabilitiesCurrent |  |  |  |  |  |  |  | 5,479,000,000 us-gaap_LiabilitiesCurrent |  | 4,881,000,000 us-gaap_LiabilitiesCurrent |  |  |
Long-term debt | 10,234,000,000 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  |  |  | 9,825,000,000 us-gaap_LongTermDebtNoncurrent |  |  |  |  |  |  |  | 10,234,000,000 us-gaap_LongTermDebtNoncurrent |  | 9,825,000,000 us-gaap_LongTermDebtNoncurrent |  |  |
Total equity | 12,982,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  |  |  | 11,691,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  |  |  |  |  |  |  | 12,982,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 11,691,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest |  | 11,191,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest | 11,086,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest
Total liabilities and equity | 50,186,000,000 us-gaap_LiabilitiesAndStockholdersEquity |  |  |  |  |  |  |  | 46,646,000,000 us-gaap_LiabilitiesAndStockholdersEquity |  |  |  |  |  |  |  | 50,186,000,000 us-gaap_LiabilitiesAndStockholdersEquity |  | 46,646,000,000 us-gaap_LiabilitiesAndStockholdersEquity |  |  |
Condensed Statements of Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue and other income | 3,114,000,000 us-gaap_Revenues |  | 4,356,000,000 us-gaap_Revenues |  | 3,016,000,000 us-gaap_Revenues |  | 2,926,000,000 us-gaap_Revenues |  | 2,943,000,000 us-gaap_Revenues |  | 3,960,000,000 us-gaap_Revenues |  | 3,046,000,000 us-gaap_Revenues |  | 2,632,000,000 us-gaap_Revenues |  | 13,413,000,000 us-gaap_Revenues |  | 12,581,000,000 us-gaap_Revenues |  | 11,862,000,000 us-gaap_Revenues |
Operating expenses and interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,941,000,000 us-gaap_CostsAndExpenses |  | 10,866,000,000 us-gaap_CostsAndExpenses |  | 9,577,000,000 us-gaap_CostsAndExpenses |
Loss before equity in earnings of subsidiaries | 693,000,000 us-gaap_OperatingIncomeLoss |  | 874,000,000 us-gaap_OperatingIncomeLoss |  | 575,000,000 us-gaap_OperatingIncomeLoss |  | 331,000,000 us-gaap_OperatingIncomeLoss |  | 505,000,000 us-gaap_OperatingIncomeLoss |  | 789,000,000 us-gaap_OperatingIncomeLoss |  | (71,000,000)us-gaap_OperatingIncomeLoss |  | 492,000,000 us-gaap_OperatingIncomeLoss |  | 2,472,000,000 us-gaap_OperatingIncomeLoss |  | 1,715,000,000 us-gaap_OperatingIncomeLoss |  | 2,285,000,000 us-gaap_OperatingIncomeLoss |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 443,000,000 us-gaap_IncomeTaxExpenseBenefit |  | 242,000,000 us-gaap_IncomeTaxExpenseBenefit |  | 267,000,000 us-gaap_IncomeTaxExpenseBenefit |
Income from continuing operations | 406,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 524,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 382,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 224,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 289,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | 488,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | (82,000,000)us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | 286,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | 1,536,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [1] | 979,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest | [2] | 1,594,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest |
Income (loss) from discontinued operations, net of tax | 39,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (16,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 184,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (22,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 37,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (25,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 12,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 12,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 185,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 36,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (1,686,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
Net income (loss) | 420,000,000 us-gaap_NetIncomeLoss |  | 480,000,000 us-gaap_NetIncomeLoss |  | 536,000,000 us-gaap_NetIncomeLoss |  | 176,000,000 us-gaap_NetIncomeLoss |  | 301,000,000 us-gaap_NetIncomeLoss |  | 438,000,000 us-gaap_NetIncomeLoss |  | (94,000,000)us-gaap_NetIncomeLoss |  | 271,000,000 us-gaap_NetIncomeLoss |  | 1,612,000,000 us-gaap_NetIncomeLoss |  | 915,000,000 us-gaap_NetIncomeLoss |  | (183,000,000)us-gaap_NetIncomeLoss |
Net income (loss) | 420,000,000 us-gaap_NetIncomeLoss |  | 480,000,000 us-gaap_NetIncomeLoss |  | 536,000,000 us-gaap_NetIncomeLoss |  | 176,000,000 us-gaap_NetIncomeLoss |  | 301,000,000 us-gaap_NetIncomeLoss |  | 438,000,000 us-gaap_NetIncomeLoss |  | (94,000,000)us-gaap_NetIncomeLoss |  | 271,000,000 us-gaap_NetIncomeLoss |  | 1,612,000,000 us-gaap_NetIncomeLoss |  | 915,000,000 us-gaap_NetIncomeLoss |  | (183,000,000)us-gaap_NetIncomeLoss |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (45,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 74,000,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  | 52,000,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax |
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,567,000,000 us-gaap_ComprehensiveIncomeNetOfTax |  | 989,000,000 us-gaap_ComprehensiveIncomeNetOfTax |  | (131,000,000)us-gaap_ComprehensiveIncomeNetOfTax |
Condensed Statements of Cash Flows: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,248,000,000 us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 2,967,000,000 us-gaap_NetCashProvidedByUsedInOperatingActivities |  | 3,334,000,000 us-gaap_NetCashProvidedByUsedInOperatingActivities |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt financing, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,079,000,000 us-gaap_ProceedsFromRepaymentsOfShortTermDebt |  | 32,000,000 us-gaap_ProceedsFromRepaymentsOfShortTermDebt |  | (264,000,000)us-gaap_ProceedsFromRepaymentsOfShortTermDebt |
Dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (463,000,000)us-gaap_PaymentsOfDividendsCommonStock |  | (440,000,000)us-gaap_PaymentsOfDividendsCommonStock |  | (424,000,000)us-gaap_PaymentsOfDividendsCommonStock |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 645,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivities |  | 581,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivities |  | 650,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivities |
Net cash used by investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,907,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (3,572,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities |  | (5,283,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (14,000,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | (24,000,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |  | (1,299,000,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease |
Cash and cash equivalents, beginning of year |  |  |  |  |  |  | 146,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  | 170,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 146,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 170,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 1,469,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Cash and cash equivalents, end of year | 132,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  | 146,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  |  |  |  |  |  |  | 132,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 146,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |  | 170,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue |
Debt and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate (as a percent) | 0.45%us-gaap_ShortTermDebtWeightedAverageInterestRate |  |  |  |  |  |  |  | 0.55%us-gaap_ShortTermDebtWeightedAverageInterestRate |  |  |  |  |  |  |  | 0.45%us-gaap_ShortTermDebtWeightedAverageInterestRate |  | 0.55%us-gaap_ShortTermDebtWeightedAverageInterestRate |  |  |
Outstanding borrowings (outstanding commercial paper was $619 million at year-end) | (619,000,000)us-gaap_LineOfCreditFacilityAmountOutstanding |  |  |  |  |  |  |  | (34,000,000)us-gaap_LineOfCreditFacilityAmountOutstanding |  |  |  |  |  |  |  | (619,000,000)us-gaap_LineOfCreditFacilityAmountOutstanding |  | (34,000,000)us-gaap_LineOfCreditFacilityAmountOutstanding |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income (loss) from discontinued operations, net of tax | 39,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (16,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 184,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (22,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 37,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (25,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 12,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 12,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 185,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | 36,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |  | (1,686,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax |
Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on debt (as a percent) | 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = eix_SeniorNotesDue2017Member |  |  |  |  |  |  |  | 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = eix_SeniorNotesDue2017Member |  |  |  |  |  |  |  | 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = eix_SeniorNotesDue2017Member |  | 3.75%us-gaap_DebtInstrumentInterestRateStatedPercentage / us-gaap_DebtInstrumentAxis = eix_SeniorNotesDue2017Member |  |  |
Revolving credit facility maturing in July 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment | 1,250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,250,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |
Outstanding borrowings (outstanding commercial paper was $619 million at year-end) | (619,000,000)us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (619,000,000)us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |
Amount available | 631,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 631,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |
Covenant requirement, consolidated debt to total capitalization, ratio | 0.65 eix_DebtInstrumentCovenantRatioofIndebtednesstoNetCapital / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.65 eix_DebtInstrumentCovenantRatioofIndebtednesstoNetCapital / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |
Consolidated debt to total capitalization, ratio | 0.48 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.48 us-gaap_RatioOfIndebtednessToNetCapital1 / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member |  |  |  |  |
Edison International |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 8,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 13,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 8,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 13,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 64,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other current assets | 531,000,000 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 166,000,000 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 531,000,000 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 166,000,000 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total current assets | 539,000,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 179,000,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 539,000,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 179,000,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Investments in subsidiaries | 12,416,000,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 10,328,000,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 12,416,000,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 10,328,000,000 us-gaap_InvestmentsInAffiliatesSubsidiariesAssociatesAndJointVentures / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Deferred income taxes | 547,000,000 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 559,000,000 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 547,000,000 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 559,000,000 us-gaap_DeferredTaxAssetsNetNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other long-term assets | 172,000,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 615,000,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 172,000,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 615,000,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total assets | 13,674,000,000 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 11,681,000,000 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 13,674,000,000 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 11,681,000,000 us-gaap_Assets / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Liabilities and equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt | 619,000,000 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 34,000,000 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 619,000,000 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 34,000,000 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Current portion of long-term debt | 204,000,000 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 204,000,000 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other current liabilities | 377,000,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 598,000,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 377,000,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 598,000,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total current liabilities | 1,200,000,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 632,000,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 1,200,000,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 632,000,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Long-term debt | 610,000,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 400,000,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 610,000,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 400,000,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Other long-term liabilities | 904,000,000 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 721,000,000 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 904,000,000 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 721,000,000 us-gaap_OtherLiabilities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total equity | 10,960,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 9,928,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 10,960,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 9,928,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Total liabilities and equity | 13,674,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 11,681,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 13,674,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 11,681,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Condensed Statements of Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue and other income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_Revenues / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Operating expenses and interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 94,000,000 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 72,000,000 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 80,000,000 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Loss before equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (91,000,000)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (72,000,000)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (80,000,000)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Equity in earnings of subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,482,000,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 922,000,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,590,000,000 us-gaap_IncomeLossFromEquityMethodInvestments / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Income before income taxes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,391,000,000 eix_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestBeforeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 850,000,000 eix_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestBeforeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,510,000,000 eix_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterestBeforeTaxes / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (36,000,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (29,000,000)us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 7,000,000 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Income from continuing operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,427,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 879,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 1,503,000,000 us-gaap_IncomeLossFromContinuingOperationsIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 185,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 36,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (1,686,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,612,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 915,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (183,000,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,612,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 915,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (183,000,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (45,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 74,000,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 52,000,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Comprehensive income (loss) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,567,000,000 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 989,000,000 us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (131,000,000)us-gaap_ComprehensiveIncomeNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Condensed Statements of Cash Flows: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (73,000,000)us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 387,000,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 355,000,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payable due to affiliate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 66,000,000 us-gaap_RepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 10,000,000 us-gaap_RepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 130,000,000 us-gaap_RepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Short-term debt financing, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 584,000,000 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 33,000,000 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (15,000,000)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Settlements of stock-based compensation, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (24,000,000)eix_StockBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (6,000,000)eix_StockBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (10,000,000)eix_StockBasedCompensation / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (463,000,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (440,000,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (424,000,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (403,000,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (319,000,000)us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net cash used by investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (95,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (35,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 0 us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (5,000,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (51,000,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 36,000,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash and cash equivalents, beginning of year |  |  |  |  |  |  | 13,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 64,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 13,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 64,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 28,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Cash and cash equivalents, end of year | 8,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 13,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 8,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 13,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 64,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends received from consolidated subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 378,000,000 eix_CashDividendsReceivedFromSubsidiaryCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 486,000,000 eix_CashDividendsReceivedFromSubsidiaryCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 469,000,000 eix_CashDividendsReceivedFromSubsidiaryCompany / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Minimum percentage of weighted-average common equity component authorization, set by CPUC (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.00%eix_WeightedAverageCommonEquityComponentMinimumPercentageAuthorizationSetByCPUC / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Current receivables due from affiliates | 267,000,000 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 34,000,000 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 267,000,000 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 34,000,000 us-gaap_DueFromAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Current payables due to affiliates | 213,000,000 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 69,000,000 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 213,000,000 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 69,000,000 us-gaap_DueToAffiliateCurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Long-term receivables due from affiliate | 125,000,000 us-gaap_DueFromAffiliateNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 486,000,000 us-gaap_DueFromAffiliateNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 125,000,000 us-gaap_DueFromAffiliateNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 486,000,000 us-gaap_DueFromAffiliateNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Long-term payables due to affiliates | 179,000,000 us-gaap_DueToAffiliateNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 135,000,000 us-gaap_DueToAffiliateNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  | 179,000,000 us-gaap_DueToAffiliateNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 135,000,000 us-gaap_DueToAffiliateNoncurrent / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |
Income (loss) from discontinued operations, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 185,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | 36,000,000 us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  | (1,686,000,000)us-gaap_IncomeLossFromDiscontinuedOperationsNetOfTax / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |
Edison International | Senior Notes Due 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Senior notes | 400,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = eix_SeniorNotesDue2017Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 400,000,000 us-gaap_SeniorNotes / us-gaap_DebtInstrumentAxis = eix_SeniorNotesDue2017Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |
Edison International | Non-interest Bearing Promissory Notes Due in September 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 204,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = eix_NoninterestBearingPromissoryNotesDueinSeptember2015Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Edison International | Non-interest Bearing Promissory Notes Due in September 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  | 214,000,000 us-gaap_DebtInstrumentFaceAmount / us-gaap_DebtInstrumentAxis = eix_NoninterestBearingPromissoryNotesDueinSeptember2016Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Edison International | Revolving credit facility maturing in July 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount available | 631,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 631,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member / dei_LegalEntityAxis = us-gaap_ParentCompanyMember |  |  |  |  |
Southern California Edison |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash and cash equivalents | 38,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 54,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 38,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 54,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 45,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Other current assets | 390,000,000 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 393,000,000 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 390,000,000 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 393,000,000 us-gaap_OtherAssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Total current assets | 3,440,000,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 3,075,000,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 3,440,000,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 3,075,000,000 us-gaap_AssetsCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Other long-term assets | 300,000,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 398,000,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 300,000,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 398,000,000 us-gaap_OtherAssetsNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Total assets | 49,456,000,000 us-gaap_Assets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 46,050,000,000 us-gaap_Assets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 49,456,000,000 us-gaap_Assets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 46,050,000,000 us-gaap_Assets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Liabilities and equity: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt | 667,000,000 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 175,000,000 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 667,000,000 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 175,000,000 us-gaap_ShortTermBorrowings / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Current portion of long-term debt | 300,000,000 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 600,000,000 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 300,000,000 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 600,000,000 us-gaap_LongTermDebtCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Other current liabilities | 1,183,000,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 1,034,000,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 1,183,000,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 1,034,000,000 us-gaap_OtherLiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Total current liabilities | 4,820,000,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 4,398,000,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 4,820,000,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 4,398,000,000 us-gaap_LiabilitiesCurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Long-term debt | 9,624,000,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 9,422,000,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 9,624,000,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 9,422,000,000 us-gaap_LongTermDebtNoncurrent / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Total equity | 13,282,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 12,138,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 13,282,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 12,138,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 11,743,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember | 9,958,000,000 us-gaap_StockholdersEquityIncludingPortionAttributableToNoncontrollingInterest / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember
Total liabilities and equity | 49,456,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 46,050,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 49,456,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 46,050,000,000 us-gaap_LiabilitiesAndStockholdersEquity / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |
Condensed Statements of Income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating revenue and other income | 3,104,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 4,338,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 3,014,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,924,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,931,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 3,957,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 3,045,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,629,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 13,380,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 12,562,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 11,851,000,000 us-gaap_Revenues / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Operating expenses and interest expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10,851,000,000 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 10,811,000,000 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 9,572,000,000 us-gaap_CostsAndExpenses / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Loss before equity in earnings of subsidiaries | 715,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 881,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 593,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 342,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 505,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 804,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (55,000,000)us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 498,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,529,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 1,751,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 2,279,000,000 us-gaap_OperatingIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 474,000,000 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 279,000,000 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 214,000,000 us-gaap_IncomeTaxExpenseBenefit / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net income (loss) | 380,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 503,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 362,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 208,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 258,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 477,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (91,000,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 256,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 1,453,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 900,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 1,569,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net income (loss) | 380,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 503,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 362,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 208,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 258,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 477,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (91,000,000)us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 256,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 1,453,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 900,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 1,569,000,000 us-gaap_NetIncomeLoss / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (17,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 18,000,000 us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (5,000,000)us-gaap_OtherComprehensiveIncomeLossNetOfTax / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Condensed Statements of Cash Flows: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net cash provided (used) by operating activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,660,000,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 3,048,000,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 4,086,000,000 us-gaap_NetCashProvidedByUsedInOperatingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Cash flows from financing activities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Short-term debt financing, net |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 490,000,000 us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (1,000,000)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (250,000,000)us-gaap_ProceedsFromRepaymentsOfShortTermDebt / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Dividends paid |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (489,000,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (587,000,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (551,000,000)us-gaap_PaymentsOfDividendsCommonStock / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net cash provided by financing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 181,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 508,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 256,000,000 us-gaap_NetCashProvidedByUsedInFinancingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net cash used by investing activities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (3,857,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (3,547,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (4,354,000,000)us-gaap_NetCashProvidedByUsedInInvestingActivities / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Net increase (decrease) in cash and cash equivalents |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (16,000,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 9,000,000 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | (12,000,000)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Cash and cash equivalents, beginning of year |  |  |  |  |  |  | 54,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 45,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 54,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 45,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 57,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Cash and cash equivalents, end of year | 38,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 54,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  | 38,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 54,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 45,000,000 us-gaap_CashAndCashEquivalentsAtCarryingValue / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Dividends [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 months |  |  |  |  |
Period for calculation of weighted average common equity component (months) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13 months |  |  |  |  |
Weighted-average common equity component of total capitalization (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 48.40%eix_WeightedAverageCommonEquityComponentPercentageOfTotalCapitalization / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |
Capacity to pay additional dividends |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 87,000,000 eix_CapacityToPayAdditionalDividends / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |
Restriction on net assets | 13,200,000,000 eix_RestrictionOnNetAssets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,200,000,000 eix_RestrictionOnNetAssets / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |
Related Party Transactions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Expenses from services provided by SCE |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,000,000 us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 3,000,000 us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  | 4,000,000 us-gaap_RelatedPartyTransactionSellingGeneralAndAdministrativeExpensesFromTransactionsWithRelatedParty / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |
Southern California Edison | Revolving credit facility maturing in July 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt and Credit Agreements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment | 2,750,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,750,000,000 us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |
Outstanding borrowings (outstanding commercial paper was $619 million at year-end) | (367,000,000)us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (367,000,000)us-gaap_LineOfCreditFacilityAmountOutstanding / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |
Amount available | $ 2,274,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,274,000,000 us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity / us-gaap_DebtInstrumentAxis = eix_CreditFacilityJuly2018Member / dei_LegalEntityAxis = eix_SouthernCaliforniaEdisonCompanyMember |  |  |  |  |
[1] | SCE recorded an impairment charge of $231 million ($96 million after-tax) in 2014. During the fourth quarter of 2014, SCE reduced its estimated impact of the San Onofre OII Settlement by $68 million ($24 million after-tax) consistent with the advice filing for reimbursement of recorded costs. 2013(in millions, except per-share amounts)Total Fourth Third Second FirstOperating revenue$12,581 $2,943 $3,960 $3,046 $2,632Operating income (loss)1,715 505 789 (71) 492Income (loss) from continuing operations1979 289 488 (82) 286Income (loss) from discontinued operations, net36 37 (25) 12 12Net income (loss) attributable to common shareholders915 301 438 (94) 271Basic earnings (loss) per share: Continuing operations2.70 0.81 1.42 (0.33) 0.79 Discontinued operations0.11 0.11 (0.08) 0.04 0.04Total2.81 0.92 1.34 (0.29) 0.83Diluted earnings (loss) per share: Continuing operations2.67 0.81 1.41 (0.33) 0.78 Discontinued operations0.11 0.11 (0.07) 0.04 0.04Total2.78 0.92 1.34 (0.29) 0.82Dividends declared per share1.3675 0.3550 0.3375 0.3375 0.3375Common stock prices: High54.19 49.95 50.34 54.19 51.24Low44.26 44.97 44.26 44.86 44.92Close46.30 46.30 46.06 48.16 50.32
[2] | During the second quarter of 2013, SCE recorded an impairment charge of $575 million ($365 million after-tax) related to the permanent retirement of San Onofre Units 2 and 3.

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- Definition This element represents disclosure of the total aggregate cash dividends received from the subsidiary company. + References No definition available. + Details
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- Definition This element represents the authorized percentage of weighted-average common equity component of total capitalization required to distribute the dividend. + References No definition available. + Details
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- Definition This element represents the percentage of weighted-average common equity component of total capitalization required to distribute the dividend. + References No definition available. + Details
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