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Debt and Credit Agreements (Long-term Debt) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ (479) | $ (79)
Long-term debt | 17,864 | 14,632
Edison International Parent and Other |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | (400) | 0
Unamortized debt discount/premium and issuance costs, net | (18) | (10)
Long-term debt | 2,732 | 1,740
Edison International Parent and Other | Debentures and notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 3,150 | 1,750
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) | 5.75% |
SCE |  |
Debt Instrument [Line Items] |  |
Current portion of long-term debt | $ (79) | (79)
Unamortized debt discount/premium and issuance costs, net | (119) | (137)
Long-term debt | 15,132 | 12,892
SCE | Debentures and notes |  |
Debt Instrument [Line Items] |  |
Long-term debt | $ 306 | 306
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 | $ 14,272 | 12,050
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 | $ 752 | $ 752
SCE | Pollution-control bonds | Minimum |  |
Debt Instrument [Line Items] |  |
Interest rate on debt (as a percent) | 1.875% |
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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -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=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 4: http://fasb.org/us-gaap/role/ref/legacyRef -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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