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Investments (Other) (Details) - Edison International - Proterra $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2021 USD ($)
Investment Holdings [Line Items] |  |
Unrealized gain (loss), pre-tax | $ (8) | $ 4
Unrealized gain (loss), net tax | (6) | 3
Long-term investments | $ 13 | $ 13

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