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Debt and Credit Agreements (Long-Term Debt) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014
Debt Instrument [Line Items] |  |  |
Current portion of long-term debt |  | $ (295) | $ (504)
Long-term debt |  | 10,964 | 10,234
Edison International Parent and Other: |  |  |
Debt Instrument [Line Items] |  |  |
Other long-term debt |  | 31 | 2
Current portion of long-term debt |  | (216) | (204)
Unamortized debt discount, net |  | (2) | (5)
Long-term debt |  | 427 | 610
Edison International Parent and Other: | Debentures and notes: |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 614 | 817
Interest rate on debt, minimum (as a percent) |  | 0.00% |
Interest rate on debt, maximum (as a percent) |  | 3.75% |
Southern California Edison |  |  |
Debt Instrument [Line Items] |  |  |
Current portion of long-term debt |  | $ (79) | (300)
Unamortized debt discount, net |  | (36) | (37)
Long-term debt |  | 10,537 | 9,624
Southern California Edison | Debentures and notes: |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 307 | 307
Interest rate on debt, minimum (as a percent) |  | 5.06% |
Interest rate on debt, maximum (as a percent) |  | 6.65% |
Southern California Edison | First and refunding mortgage bonds: |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross |  | $ 9,436 | 8,875
Interest rate on debt, minimum (as a percent) |  | 1.125% |
Interest rate on debt, maximum (as a percent) |  | 6.05% |
Southern California Edison | Pollution-control bonds: |  |  |
Debt Instrument [Line Items] |  |  |
Long-term Debt, Gross | [1] | $ 909 | $ 779
Interest rate on debt, minimum (as a percent) |  | 1.375% |
Interest rate on debt, maximum (as a percent) |  | 5.00% |
[1] | 1 Includes outstanding bonds that have not been retired and may be remarketed to investors in the future. These bonds have variable rates and are due in 2031 at December 31, 2015.

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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- Definition Maximum contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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