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Summary of Significant Accounting Policies (Narrative) (Details) mi² in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended | 24 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) MW | Dec. 31, 2014 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2013 USD ($) | Dec. 31, 2015 USD ($) mi² MW shares | Dec. 31, 2014 USD ($) financing shares | Dec. 31, 2013 USD ($) shares | Dec. 31, 2014 USD ($) | May. 31, 2013 USD ($)
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Reinvested Proceeds from Decommissioning Fund |  |  |  |  |  | $ 13,700,000,000 | $ 7,500,000,000 | $ 4,400,000,000 |  |
Maximum Maturity of Cash Equivalent Investments Period |  |  |  |  |  | 3 months |  |  |  |
Depreciation |  |  |  |  |  | $ 1,420,000,000 | 1,330,000,000 | 1,310,000,000 |  |
Impairment and other charges |  | $ 382,000,000 |  |  |  | 5,000,000 | 157,000,000 | $ 571,000,000 |  |
Asset retirement obligations | $ 2,821,000,000 | 2,764,000,000 | $ 2,821,000,000 |  |  | 2,764,000,000 | 2,821,000,000 |  | $ 2,821,000,000 |
Regulatory assets | 7,612,000,000 | 7,512,000,000 | 7,612,000,000 |  |  | 7,512,000,000 | 7,612,000,000 |  | 7,612,000,000 |
Assets | 49,734,000,000 | 50,310,000,000 | 49,734,000,000 |  |  | 50,310,000,000 | 49,734,000,000 |  | 49,734,000,000 |
Liabilities | 36,746,000,000 | 36,916,000,000 | 36,746,000,000 |  |  | 36,916,000,000 | 36,746,000,000 |  | 36,746,000,000 |
Net current deferred tax liabilities | (6,861,000,000) | (7,480,000,000) | (6,861,000,000) |  |  | $ (7,480,000,000) | $ (6,861,000,000) |  | (6,861,000,000) |
Stock Compensation Plan |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Antidilutive stock option awards excluded from earnings per share, number of shares | shares |  |  |  |  |  | 2,046,045 | 125,345 | 3,977,894 |  |
Southern California Edison |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Public Utilities Depreciation Expense Stated As A Percentage Of Average Original Cost Of Depreciable Utility Plant |  |  |  |  |  | 3.90% | 4.00% | 4.20% |  |
Estimated cost of debt and equity funds for construction, capitalized |  |  |  |  |  | $ 87,000,000 | $ 65,000,000 | $ 72,000,000 |  |
AFUDC debt capitalized during construction |  |  |  |  |  | 31,000,000 | 25,000,000 | 33,000,000 |  |
Impairment and other charges |  |  |  |  |  | 0 | 163,000,000 | 575,000,000 |  |
Asset retirement obligations | 2,819,000,000 | $ 2,762,000,000 | 2,819,000,000 |  |  | 2,762,000,000 | 2,819,000,000 | 3,418,000,000 | 2,819,000,000 |
Revisions to asset retirement obligation, increase (decrease) |  |  |  |  |  | $ (14,000,000) | (790,000,000) |  |  |
Decommissioning Cost Escalated Rates, Low End of Range |  | 1.40% |  |  |  | 1.40% |  |  |  |
Decommissioning Cost Escalated Rates, High End of Range |  | 7.30% |  |  |  | 7.30% |  |  |  |
Decommissioning Funds Estimated Annual Earnings, Net of Tax Percentage, Low End of Range |  |  |  |  |  | 3.30% |  |  |  |
Decommissioning Funds Estimated Annual Earnings, Net of Tax Percentage, High End of Range |  |  |  |  |  | 4.10% |  |  |  |
Decommissioning Expense under Rate Making Method |  |  |  |  |  |  | 5,000,000 | 22,000,000 |  |
Regulatory assets | 7,612,000,000 | $ 7,512,000,000 | 7,612,000,000 |  |  | $ 7,512,000,000 | 7,612,000,000 |  | 7,612,000,000 |
Unamortized debt issuance expense | 75,000,000 | 84,000,000 | 75,000,000 |  |  | 84,000,000 | 75,000,000 |  | 75,000,000 |
Franchise Fees Billed to Customers |  |  |  |  |  | $ 138,000,000 | 134,000,000 | 116,000,000 |  |
Period for calculation of weighted average common equity component (months) |  |  |  |  |  | 13 months |  |  |  |
Weighted Average Common Equity Component, Percentage of Total Capitalization |  |  |  |  |  | 49.90% |  |  |  |
Capacity to Pay Additional Dividends |  |  |  |  |  | $ 441,000,000 |  |  |  |
Restriction on net assets |  | 13,200,000,000 |  |  |  | 13,200,000,000 |  |  |  |
Assets | 49,456,000,000 | 49,872,000,000 | 49,456,000,000 |  |  | 49,872,000,000 | 49,456,000,000 |  | 49,456,000,000 |
Liabilities | 36,174,000,000 | 36,200,000,000 | 36,174,000,000 |  |  | 36,200,000,000 | 36,174,000,000 |  | 36,174,000,000 |
Net current deferred tax liabilities | (8,497,000,000) | (9,073,000,000) | (8,497,000,000) |  |  | (9,073,000,000) | (8,497,000,000) |  | (8,497,000,000) |
Southern California Edison | Loss on Reacquired Debt |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Regulatory assets | 201,000,000 | 201,000,000 | 201,000,000 |  |  | 201,000,000 | 201,000,000 |  | 201,000,000 |
Southern California Edison | San Onofre 2 and 3 |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Reclassification To Regulatory Assets Amount |  |  |  |  |  |  |  |  |  | $ 1,521,000,000
Impairment and other charges |  |  | 68,000,000 | $ 231,000,000 | $ 575,000,000 |  | 163,000,000 |  | 738,000,000 |
Asset impairment net of tax |  |  | 24,000,000 | $ 96,000,000 | $ 365,000,000 |  | 72,000,000 |  | 437,000,000 |
Revisions to asset retirement obligation, increase (decrease) |  |  |  |  |  |  | 688,000,000 |  |  |
Southern California Edison | Palo Verde, San Onofre 1, 2 and 3 [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Decommissioning Active and Inactive Nuclear Facilities Asset Retirement Obligation |  | 2,700,000,000 |  |  |  | 2,700,000,000 |  |  |  |
Decommissioning Estimated Cost |  |  |  |  |  | 7,200,000,000 |  |  |  |
Southern California Edison | Palo Verde |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in asset retirement obligation | (253,000,000) |  |  |  |  |  |  |  |  |
Southern California Edison | San Onofre 1 |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Increase (decrease) in asset retirement obligation | 124,000,000 |  |  |  |  |  |  |  |  |
Decommissioning Expenditures to Date |  | 484,000,000 |  |  |  | 484,000,000 |  |  |  |
Southern California Edison | Other Current Assets |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Greenhouse Gas Allowances | 204,000,000 | 79,000,000 | 204,000,000 |  |  | 79,000,000 | 204,000,000 |  | 204,000,000 |
Southern California Edison | Other Current Liabilities |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Greenhouse Gas Emission Obligations | 211,000,000 | 86,000,000 | 211,000,000 |  |  | 86,000,000 | 211,000,000 |  | 211,000,000 |
Edison International |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Unamortized debt issuance expense | 83,000,000 | 92,000,000 | 83,000,000 |  |  | $ 92,000,000 | 83,000,000 |  | 83,000,000 |
Weighted Average Common Equity Component Minimum Percentage Authorization Set By C P U C |  |  |  |  |  | 48.00% |  |  |  |
Weighted-average common equity component authorization, set by CPUC remaining over number of months (in months) |  |  |  |  |  | 13 months |  |  |  |
Assets | $ 13,674,000,000 | 13,699,000,000 | $ 13,674,000,000 |  |  | $ 13,699,000,000 | 13,674,000,000 |  | $ 13,674,000,000 |
Net income |  |  |  |  |  | 1,020,000,000 | $ 1,612,000,000 | $ 915,000,000 |  |
Unidentified Subsidiary, Limited Liability Company |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Assets |  | 82,000,000 |  |  |  | 82,000,000 |  |  |  |
Liabilities |  | $ 32,000,000 |  |  |  | 32,000,000 |  |  |  |
Net income |  |  |  |  |  | $ 16,000,000 |  |  |  |
Unidentified Subsidiary, Limited Liability Company | Call Option |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Term of derivative contract |  |  |  |  |  | 9 months |  |  |  |
Cooldown period after completion of project |  |  |  |  |  | 5 years |  |  |  |
Indirect Subsidiaries |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Number of new financings | financing |  |  |  |  |  |  | 3 |  |  |
Power generating capacity for majority interest (in megawatts) | MW |  | 29 |  |  |  | 29 |  |  |  |
Debt Instrument, Term |  |  |  |  |  | 7 years |  |  |  |
Percent of taxable profits and losses and tax credits attributable to tax equity investors, period one |  |  |  |  |  | 99.00% |  |  |  |
Period of taxable profits and losses and tax credits attributable to tax equity investors, period one |  |  |  |  |  | 6 years |  |  |  |
Priority return on investment for noncontrolling interest holders |  |  |  |  |  | 2.00% |  |  |  |
Percent of taxable profits and losses and tax credits attributable to tax equity investors, period two |  |  |  |  |  | 5.00% |  |  |  |
Electric Utility | Southern California Edison |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Supply Of Electricity Area Covered (in square miles) | mi² |  |  |  |  |  | 50 |  |  |  |
Adjustments for New Accounting Principle, Early Adoption [Member] |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Net current deferred tax assets |  | $ 452,000,000 |  |  |  | $ 452,000,000 |  |  |  |
Adjustments for New Accounting Principle, Early Adoption [Member] | Southern California Edison |  |  |  |  |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |
Net current deferred tax liabilities |  | $ 209,000,000 |  |  |  | $ 209,000,000 |  |  |  |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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