Investments (Trust Value) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Fair Value
Fair Value	$ 4,039	$ 4,870
Repurchase agreements
Fair Value
Fair Value	48	37
SCE
Fair Value
Amortized Cost	2,347	2,555
Fair Value	4,039	4,870
SCE | Municipal bonds
Fair Value
Amortized Cost	843	875
SCE | Government and agency securities
Fair Value
Amortized Cost	933	1,095
SCE | Corporate bonds
Fair Value
Amortized Cost	371	386
SCE | Short-term investments and receivables/payables
Fair Value
Amortized Cost	200	199
SCE | Fair Value, Measurements, Recurring
Fair Value
Fair Value	4,076	4,889
SCE | Fair Value, Measurements, Recurring | Stocks
Fair Value
Fair Value	1,548	1,972
SCE | Fair Value, Measurements, Recurring | Municipal bonds
Fair Value
Fair Value	905	1,033
SCE | Fair Value, Measurements, Recurring | Government and agency securities
Fair Value
Fair Value	986	1,212
SCE | Fair Value, Measurements, Recurring | Corporate bonds
Fair Value
Fair Value	390	446
SCE | Fair Value, Measurements, Recurring | Short-term investments and receivables/payables
Fair Value
Fair Value	$ 210	$ 207