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Debt and Credit Agreements (Textual) (Details) | 1 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 31, 2018 USD ($) | May 31, 2018 USD ($) extension | Jan. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) | Apr. 30, 2018 USD ($) | Mar. 31, 2018 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 2,393,000,000 | $ 103,000,000 |  |
Term Loan Agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt |  |  | $ 500,000,000 |  |  |  |
London Interbank Offered Rate |  |  | 0.60% |  |  |  |
4.125% Senior notes due 2028 | Senior notes |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 550,000,000
Stated interest rate |  |  |  |  |  |  | 4.125%
Multi-year revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment |  | $ 1,500,000,000.0 |  |  |  | $ 1,250,000,000.00 |
Short-term debt |  |  |  | $ 639,000,000 | 0 |  |
Weighted average interest rate |  |  |  | 1.70% |  |  |
Credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average interest rate |  |  |  | 2.56% |  |  |
Proceeds from credit facility |  |  |  | $ 500,000,000 |  |  |
Repayments of credit facility |  |  | $ 500,000,000 |  |  |  |
Southern California Edison |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  | $ 1,238,000,000 | 103,000,000 |  |
Southern California Edison | First and refunding mortgage bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Proceeds from issuance of debt | $ 850,000,000 |  |  |  |  |  |
Southern California Edison | 3.65% First and refunding mortgage bonds due 2028 | First and refunding mortgage bonds |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt |  |  |  |  |  |  | $ 400,000,000
Repayments of First Mortgage Bond |  |  |  |  | 400,000,000 |  |
Stated interest rate |  |  |  |  |  |  | 3.65%
Southern California Edison | Multi-year revolving credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Commitment |  | $ 3,000,000,000 |  |  |  | $ 2,750,000,000.00 |
Number of extension options | extension |  | 2 |  |  |  |  |
Southern California Edison | Multi-year revolving credit facility | Commercial paper |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average interest rate |  |  |  | 1.75% |  |  |
Outstanding commercial paper |  |  |  | $ 738,000,000 |  |  |
Southern California Edison | Multi-year revolving credit facility | Letters of credit |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Outstanding letters of credit |  |  |  |  | $ 264,000,000 |  |
Letters of credit expiration period |  |  |  |  | 12 months |  |
Southern California Edison | Multi-year revolving credit facility | Commercial paper |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Short-term debt |  |  |  |  | $ 103,000,000 |  |
Weighted average interest rate |  |  |  |  | 2.38% |  |
Southern California Edison | Credit facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Weighted average interest rate |  |  |  | 2.46% |  |  |
Proceeds from credit facility |  |  |  | $ 500,000,000 |  |  |
Repayments of credit facility |  |  | $ 500,000,000 |  |  |  |

X
- Definition Line of Credit Facility, Number of One Year Extension Options + References No definition available. + Details
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- Definition Short-term Debt, Expiration Period + References No definition available. + Details
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- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
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- Definition Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400 + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: 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(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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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://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 2: 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 Reference 3: 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=6879938&loc=d3e572229-122910 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(f)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition The cash outflow from the repayment of a long-term debt instrument issued, secured by a first mortgage deed of trust, containing a pledge of real property. The lender has the highest claim on the property in case of default. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3291-108585 + Details
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