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Debt and Credit Agreements (Long-term Debt) (Details) - USD ($) $ in Millions | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ (481) | $ (981)
Long-term debt | 11,642 | 10,175
Edison International Parent and Other |  |
Debt Instrument [Line Items] |  |
Other long-term debt | 29 | 32
Current portion of long-term debt | (2) | (402)
Unamortized debt discount and issuance costs, net | (13) | (9)
Long-term debt | 1,214 | 421
Edison International Parent and Other | Debentures and notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 1,200 | 800
Edison International Parent and Other | Debentures and notes | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 2.125% |
Edison International Parent and Other | Debentures and notes | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 2.95% |
SCE |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ (479) | (579)
Unamortized debt discount and issuance costs, net | (88) | (105)
Long-term debt | 10,428 | 9,754
SCE | Debentures and notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 307 | 307
SCE | Debentures and notes | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 5.06% |
SCE | Debentures and notes | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 6.65% |
SCE | First and refunding mortgage bonds |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 9,779 | 9,357
SCE | First and refunding mortgage bonds | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 1.845% |
SCE | First and refunding mortgage bonds | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 6.05% |
SCE | Pollution-control bonds |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 909 | $ 774
SCE | Pollution-control bonds | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 1.375% |
SCE | Pollution-control bonds | Maximum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 5.00% |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + 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 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 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 + Details
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- Definition 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 Amount of unamortized debt discount (premium) and debt issuance costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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