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Debt and Credit Agreements (Schedule of First and Refunding Mortgage Bonds) (Details) - Southern California Edison - First and refunding mortgage bonds - USD ($) $ in Millions | Aug. 31, 2018 | Jun. 30, 2018 | Mar. 31, 2018
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2.90% First and refunding mortgage bonds due 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  |  | 2.90%
Debt |  |  | $ 450
3.65% First and refunding mortgage bonds due 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  |  | 3.65%
Debt |  |  | $ 400
3.40% First and refunding mortgage bonds due 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 3.40% |
Debt |  | $ 300 |
3.70% First and refunding mortgage bonds due 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 3.70% |  |
Debt | $ 300 |  |
4.125% First and refunding mortgage bonds due 2048 |  |  |
Debt Instrument [Line Items] |  |  |
Debt |  | $ 1,300 |
4.125% First and refunding mortgage bonds due 2048, issued March 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  |  | 4.125%
Debt |  |  | $ 400
4.125% First and refunding mortgage bonds due 2048, issued June 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate |  | 4.125% |
Debt |  | $ 350 |
4.125% First and refunding mortgage bonds due 2048, issued August 2018 |  |  |
Debt Instrument [Line Items] |  |  |
Stated interest rate | 4.125% |  |
Debt | $ 550 |  |

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