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Fair Value Measurements (Textual) (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Jun. 30, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds |  | $ 31,000,000 |  | $ 62,000,000
Edison Energy Group |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Goodwill impairment | $ 34,000,000 | 25,000,000 | $ 19,000,000 |
Goodwill impairment after-tax | $ 25,000,000 | 18,000,000 | $ 13,000,000 |
Edison International Parent and Other |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Short-term investments |  | 0 |  |
Edison International Parent and Other | Level 1 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Money market funds |  | $ 31,000,000 |  | 24,000,000
Edison International Parent and Other | Level 2 |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Short-term investments |  |  |  | $ 5,000,000

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