Investments (Trust Value) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Fair Value Measurements
Fair Values	$ 4,292	$ 4,173
SCE
Fair Value Measurements
Fair Values	4,292	4,173
Deferred income taxes related to unrealized gains	397	380
SCE | Total debt securities and other
Fair Value Measurements
Amortized Costs	2,305	2,233
Fair Values	2,551	2,515
SCE | Municipal bonds
Fair Value Measurements
Amortized Costs	704	636
Fair Values	815	757
SCE | Government and agency securities
Fair Value Measurements
Amortized Costs	1,104	1,072
Fair Values	1,195	1,186
SCE | Corporate bonds
Fair Value Measurements
Amortized Costs	464	361
Fair Values	507	401
SCE | Short-term investments and receivables/payables
Fair Value Measurements
Amortized Costs	33	164
Fair Values	34	171
SCE | Repurchase agreements
Fair Value Measurements
Fair Values	6	38
SCE | Equity securities
Fair Value Measurements
Fair Values	1,741	1,658
SCE | Fair Value, Measurements, Recurring
Fair Value Measurements
Fair Values	$ 4,365	$ 4,275