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Debt and Credit Agreements (Details) |  | 1 Months Ended | 3 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Aug. 01, 2019 USD ($) | Oct. 27, 2020 USD ($) | Sep. 30, 2020 USD ($) | May 31, 2020 USD ($) | Mar. 31, 2020 USD ($) extension | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 30, 2020 USD ($)
2017/2018 Wildfire/Mudslide Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amounts paid |  |  |  |  |  |  |  | $ 37,000,000
4.95% senior notes due 2025 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  | $ 400,000,000 |  |
Stated interest rate |  |  |  |  |  | 4.95% |  |
2.125% senior notes due 2020 | Senior notes |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Stated interest rate |  |  |  |  |  | 2.125% |  |
Repayments of outstanding debt |  |  |  |  |  | $ 400,000,000 |  |
Term Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  | $ 800,000,000 |  |  |
Term Loan Agreement | London Interbank Offered Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 1.125% |  |  |
Multi-year revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Multi-year revolving credit facilities |  |  | $ 1,500,000,000 |  |  |  |  | 1,500,000,000
Commitment |  |  | 2,000,000,000.0 |  |  |  |  | 2,000,000,000.0
Multi-year revolving credit facility | Commercial paper |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding commercial paper |  |  | 0 |  |  |  | $ 0 | 0
Southern California Edison |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repurchased tax exempt pollution bonds |  |  |  |  |  | 373,000,000 |  |
Excluded wildfire risk mitigation capital expenditures | $ 1,600,000,000 |  |  |  | $ 1,600,000,000 |  |  |
Southern California Edison | 2017/2018 Wildfire/Mudslide Event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amounts paid |  |  |  |  |  |  | 360,000,000 | 37,000,000
Southern California Edison | 2017/2018 Wildfire/Mudslide Event | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Amounts paid |  | $ 1,200,000,000 |  |  |  |  |  |
Southern California Edison | 4.20% first and refunding mortgage bonds due 2029 | First and refunding mortgage bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  | $ 100,000,000 |  |  |
Stated interest rate |  |  |  |  | 2.85% |  |  |
Southern California Edison | 4.875% first and refunding mortgage bonds due 2049 | First and refunding mortgage bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  | $ 500,000,000 |  |  |
Stated interest rate |  |  |  |  | 3.65% |  |  |
Southern California Edison | 2.25% first and refunding mortgage bonds due 2030 | First and refunding mortgage bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  | $ 400,000,000 |  |  |
Stated interest rate |  |  |  |  | 2.25% |  |  |
Southern California Edison | 3.65% first and refunding mortgage bonds due 2050 | First and refunding mortgage bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  | $ 700,000,000 |  |  |
Stated interest rate |  |  |  |  | 3.65% |  |  |
Southern California Edison | 3.70% first and refunding mortgage bonds due 2025 | First and refunding mortgage bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  |  | $ 600,000,000 |  |
Stated interest rate |  |  |  |  |  | 3.70% |  |
Southern California Edison | Tax-exempt pollution control bonds |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Repayment of tax-exempt pollution control bonds |  |  | 244,000,000 |  |  |  |  |
Southern California Edison | May 2020 credit agreement | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Multi-year revolving credit facilities |  |  |  | $ 1,500,000,000 |  |  |  |
Amounts drawn against the revolving credit facility |  |  | 0 |  |  |  |  | 0
Southern California Edison | May 2020 credit agreement | London Interbank Offered Rate | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 1.50% |  |  |  |
Southern California Edison | Term Loan Agreement |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  |  |  |  | $ 475,000,000 |  |  |
Southern California Edison | Term Loan Agreement | London Interbank Offered Rate |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 0.60% |  |  |
Southern California Edison | March 2020 credit agreement | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Multi-year revolving credit facilities |  |  |  |  | $ 800,000,000 |  |  |
Amounts drawn against the revolving credit facility |  |  | 654,000,000 |  |  |  |  | 654,000,000
Number of 364-day extensions | extension |  |  |  |  | 2 |  |  |
Commitment |  |  |  |  | $ 1,100,000,000 |  |  |
Southern California Edison | March 2020 credit agreement | London Interbank Offered Rate | Revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 0.65% |  |  |
Southern California Edison | Multi-year revolving credit facility |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Multi-year revolving credit facilities |  |  | 3,000,000,000.0 |  |  |  |  | 3,000,000,000.0
Commitment |  |  | 4,000,000,000.0 |  |  |  |  | 4,000,000,000.0
Southern California Edison | Multi-year revolving credit facility | Commercial paper |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding commercial paper |  |  | $ 623,000,000 |  |  |  | $ 550,000,000 | $ 623,000,000
Weighted average interest rate |  |  | 0.25% |  |  |  | 2.24% | 0.25%
Southern California Edison | Multi-year revolving credit facility | Letters of credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Outstanding letters of credit |  |  | $ 200,000,000 |  |  |  | $ 152,000,000 | $ 200,000,000
Letters of credit expiration period |  |  |  |  |  |  |  | 12 months
Southern California Edison | 1.20% first and refunding mortgage bonds due 2026 | First and refunding mortgage bonds | Subsequent event |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Debt |  | $ 350,000,000 |  |  |  |  |  |
Stated interest rate |  | 1.20% |  |  |  |  |  |

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