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Debt and Credit Agreements (Textual) (Details) - USD ($) | 1 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jan. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Carrying value |  | $ 12,123,000,000 | $ 12,123,000,000 | $ 11,156,000,000
Short-term debt |  | 2,393,000,000 | 2,393,000,000 | 1,307,000,000
Line of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings from credit facility |  | 500,000,000 |  |
Line of credit | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment on borrowings | $ 500,000,000 |  |  |
Multi-year credit facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment |  | 1,250,000,000 | 1,250,000,000 |
Outstanding borrowings |  | 1,139,000,000 | 1,139,000,000 | $ 538,000,000
Weighted average interest rate (as a percent) |  |  |  | 0.97%
Outstanding letters of credit |  | 0 | 0 |
Multi-year credit facilities | Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings |  | $ 639,000,000 | $ 639,000,000 |
Weighted average interest rate (as a percent) |  | 1.70% | 1.70% |
Indirect subsidiary of Edison Energy Group | Non-recourse debt financing to support equity investments in solar rooftop projects |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value |  | $ 31,000,000 | $ 31,000,000 | $ 22,000,000
Short-term debt |  | $ 16,000,000 | $ 16,000,000 |
Weighted average interest rate on long term debt |  | 4.50% | 4.50% | 4.86%
Remaining borrowings available |  | $ 67,000,000 | $ 67,000,000 |
Indirect subsidiary of Edison Energy Group | Non-recourse debt, 2 tax equity financing to support equity investments in solar rooftop projects |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Remaining borrowings available |  | 21,000,000 | $ 21,000,000 |
Percentage of taxable profits and losses and tax credits |  |  | 99.00% |
Period following the completion of the portfolio of projects (term) |  |  | 6 years |
Priority return on investment (percent) |  |  | 2.00% |
Percentage of taxable profits and losses and cash flow |  |  | 5.00% |
Call option, period |  |  | 9 months |
Period after project completion |  |  | 5 years |
Indirect subsidiary of Edison Energy Group | Non-recourse debt third equity financing to support equity investments in solar rooftop projects |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Remaining borrowings available |  | 38,000,000 | $ 38,000,000 |
Percentage of taxable profits and losses and tax credits |  |  | 99.00% |
Period following the completion of the portfolio of projects (term) |  |  | 20 years |
Taxable income and losses after the initial period |  |  | 67.00% |
Cash flows until certain conditions are met |  |  | 28.40% |
Indirect subsidiaries | Non-recourse debt financing to support equity investments in solar rooftop projects |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value |  | $ 10,000,000 | $ 10,000,000 | $ 10,000,000
Weighted average interest rate on long term debt |  | 9.00% | 9.00% | 9.00%
SCE |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Carrying value |  | $ 10,907,000,000 | $ 10,907,000,000 | $ 10,333,000,000
Short-term debt |  | $ 1,238,000,000 | $ 1,238,000,000 | 769,000,000
Weighted average interest rate (as a percent) |  | 2.56% | 2.56% |
SCE | Line of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Borrowings from credit facility |  | $ 500,000,000 |  |
SCE | Line of credit | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Repayment on borrowings | 500,000,000 |  |  |
SCE | Multi-year credit facilities |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment |  | 2,750,000,000 | $ 2,750,000,000 |
Outstanding borrowings |  | $ 1,238,000,000 | $ 1,238,000,000 |
Weighted average interest rate (as a percent) |  | 2.46% | 2.46% |
Outstanding letters of credit |  | $ 99,000,000 | $ 99,000,000 |
SCE | Multi-year credit facilities | Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings |  |  |  | $ 769,000,000
Weighted average interest rate (as a percent) |  | 1.75% | 1.75% | 0.90%
SCE | Multi-year credit facilities | Letters of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding letters of credit |  | $ 99,000,000 | $ 99,000,000 |
SCE | Commercial paper supported by SCE's credit facility | Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings |  | $ 738,000,000 | $ 738,000,000 |
Edison International Parent and Other | Term Loan Agreement | Subsequent event |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt, face amount | $ 500,000,000 |  |  |
Basis points | 60.00% |  |  |

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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 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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. 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 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: 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 3: 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 + Details
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