Investments (Other) (Details) - Edison International Parent and Other - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Investments
Marketable securities	$ 7		$ 7		$ 12
Cumulative upward adjustments investments without readily determinable fair values	9		9		1
Marketable securities, Unrealized gains/(losses)		$ (8)	(5)	$ 4
Equity investments without readily determinable fair values - upward adjustments	11		11		$ 3
Unrealized gains, Equity investments without readily determinable fair values	8		8	1
Total unrealized gains/(losses)	$ 8	$ (8)	$ 3	$ 5

Amount of unrealized gain (loss) on investment in debt and equity securities.

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Amount of investment in equity security without readily determinable fair value.

+ References

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Amount of gain from upward price adjustment on investment in equity security without readily determinable fair value.

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Amount of cumulative gain from upward price adjustment on investment in equity security without readily determinable fair value.

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Amount of investment in marketable security.

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Amount of unrealized gain (loss) on investment in marketable security.

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