Investments (Trust Value) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value
Fair Value	$ 3,823	$ 4,870
SCE
Fair Value
Amortized Cost	2,225	2,555
Fair Value	3,823	4,870
SCE | Municipal bonds
Fair Value
Amortized Cost	767	875
SCE | Government and agency securities
Fair Value
Amortized Cost	846	1,095
SCE | Corporate bonds
Fair Value
Amortized Cost	376	386
SCE | Short-term investments and receivables/payables
Fair Value
Amortized Cost	236	199
SCE | Repurchase agreements
Fair Value
Fair Value	69	37
SCE | Fair Value, Measurements, Recurring
Fair Value
Fair Value	3,874	4,889
SCE | Fair Value, Measurements, Recurring | Equity securities
Fair Value
Fair Value	1,465	1,972
SCE | Fair Value, Measurements, Recurring | Municipal bonds
Fair Value
Fair Value	806	1,033
SCE | Fair Value, Measurements, Recurring | Government and agency securities
Fair Value
Fair Value	899	1,212
SCE | Fair Value, Measurements, Recurring | Corporate bonds
Fair Value
Fair Value	398	446
SCE | Fair Value, Measurements, Recurring | Short-term investments and receivables/payables
Fair Value
Fair Value	$ 255	$ 207