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Debt and Credit Agreements (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 | Mar. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 566,000,000 |  | $ 566,000,000 | $ 1,307,000,000
Multi-year revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment | $ 1,250,000,000.00 |  | $ 1,250,000,000.00 |
Weighted average interest rate | 1.38% |  | 1.38% | 0.97%
Short-term debt | $ 344,000,000 |  | $ 344,000,000 | $ 538,000,000
Southern California Edison |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Short-term debt | $ 219,000,000 |  | 219,000,000 | 769,000,000
Southern California Edison | Term Loan Agreement |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of debt |  | $ 300,000,000 |  |
London Interbank Offered Rate |  | 65.00% |  |
Interest rate during the period | 1.82% |  |  |
Southern California Edison | Pollution-control bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of debt |  | $ 135,000,000 |  |
Stated interest rate |  | 2.625% |  |
Southern California Edison | 4.00% First and refunding mortgage bonds due 2047 | First and refunding mortgage bonds |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of debt |  | $ 700,000,000 |  |
Stated interest rate |  | 4.00% |  |
Southern California Edison | 2.125% Senior notes due 2020 | Senior notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of debt |  | $ 400,000,000 |  |
Stated interest rate |  | 2.125% |  |
Southern California Edison | Multi-year revolving credit facility |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Commitment | $ 2,750,000,000.00 |  | 2,750,000,000.00 |
Southern California Edison | Multi-year revolving credit facility | Letters of credit |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding letters of credit | $ 53,000,000 |  | $ 53,000,000 |
Letters of credit expiration period |  |  | 12 months |
Southern California Edison | Multi-year revolving credit facility | Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Outstanding borrowings |  |  |  | $ 769,000,000
Weighted average interest rate |  |  |  | 0.90%
Southern California Edison | Multi-year revolving credit facility | Commercial paper |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Weighted average interest rate | 1.29% |  | 1.29% |
Short-term debt | $ 219,000,000 |  | $ 219,000,000 |

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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://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=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 Reference 2: 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 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 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 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://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(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + 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(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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