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Debt and Credit Agreements (Additional Information) (Details) | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2015 USD ($) MW | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Debt Instrument [Line Items] |  |  |  |
Carrying Value | $ 11,259,000,000 |  |  | $ 10,738,000,000
Short-term debt | 695,000,000 |  |  | 1,291,000,000
Credit Facility July 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment | 1,250,000,000 |  |  |
Outstanding borrowings | 646,000,000 |  |  |
Outstanding letters of credit | 0 |  |  |
Amount available | 604,000,000 |  |  |
Non-recourse Solar Rooftop Project Equity Investment Financing |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying Value | $ 6,000,000 |  |  | 0
Weighted average interest rate on long term debt | 9.00% |  |  |
Debt Instrument, Face Amount |  |  |  | $ 80,000,000
Non-recourse Solar Rooftop Project Investment Financing |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate (as a percent) |  |  |  | 2.67%
Carrying Value | $ 25,000,000 |  |  | $ 5,100,000
Weighted average interest rate on long term debt | 3.11% |  |  |
Power generating capacity (in megawatts) | MW | 29 |  |  |
Debt Instrument, Term | 7 years |  |  |
Indirect Subsidiaries |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Power generating capacity (in megawatts) | MW | 29 |  |  |
Debt Instrument, Term | 7 years |  |  |
Southern California Edison |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying Value | $ 10,616,000,000 |  |  | 9,924,000,000
Short-term debt | 49,000,000 |  |  | 667,000,000
Southern California Edison | Credit Facility July 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment | 2,750,000,000 |  |  |
Outstanding borrowings | 49,000,000 |  |  |
Outstanding letters of credit | (125,000,000) |  |  |
Amount available | $ 2,576,000,000 |  |  |
Southern California Edison | Amortizing First and Refunding Mortgage Bonds Due in 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 550,000,000 |
Interest rate on debt (as a percent) |  |  | 1.845% |
Southern California Edison | First and Refunding Mortgage Bonds Due in 2022 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 325,000,000 |
Interest rate on debt (as a percent) |  |  | 2.40% |
Southern California Edison | 1.875% Pollution-Control Bonds Due in 2029 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 56,000,000 |  |
Interest rate on debt (as a percent) |  | 1.875% |  |
Southern California Edison | 1.875% Pollution-Control Bonds Due in 2031 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  | $ 75,000,000 |  |
Interest rate on debt (as a percent) |  | 1.875% |  |
Southern California Edison | First and Refunding Mortgage Bonds Due in 2045 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Face Amount |  |  | $ 425,000,000 |
Interest rate on debt (as a percent) |  |  | 3.60% |
Edison International |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings |  |  |  | $ 619,000,000
Weighted average interest rate (as a percent) | 0.78% |  |  | 0.45%
Short-term debt | $ 646,000,000 |  |  | $ 619,000,000
Edison International | Credit Facility July 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment | 1,250,000,000 |  |  |
Commercial paper | Southern California Edison | Credit Facility July 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings | $ 49,000,000 |  |  |
Weighted average interest rate (as a percent) | 0.51% |  |  | 0.40%
Short-term debt |  |  |  | $ 367,000,000
Commercial paper | Edison International |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings | $ 646,000,000 |  |  |
Letters of credit | Southern California Edison | Credit Facility July 2020 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Letters of credit expiration period | 12 months |  |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19, 20, 22 -Article 5 + Details
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