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Summary of Significant Accounting Policies - Schedule of Changes in Allowance for Uncollectible Accounts (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Credit Loss Roll Forward          
Allowance for uncollectible accounts $ 41   $ 41   $ 43
SCE          
Credit Loss Roll Forward          
Beginning balance 357 $ 364 390 $ 364  
Current period provision for uncollectible accounts 97 90 266 208  
Write-offs, net of recoveries (92) (78) (294) (196)  
Ending balance 362 376 362 376  
Recovery from customers, incremental costs 76 74 211 170  
Allowance for uncollectible accounts 41   41   $ 43
SCE | Customers          
Credit Loss Roll Forward          
Beginning balance 335 349 372 347  
Current period provision for uncollectible accounts 96 90 256 204  
Write-offs, net of recoveries (89) (75) (286) (187)  
Ending balance 342 364 342 364  
SCE | All others          
Credit Loss Roll Forward          
Beginning balance 22 15 18 17  
Current period provision for uncollectible accounts 1 0 10 4  
Write-offs, net of recoveries (3) (3) (8) (9)  
Ending balance $ 20 $ 12 $ 20 $ 12