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Commitments and Contingencies (Other commitments) (Details) - SCE - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Other Commitments [Line Items]      
2024 $ 49    
2025 36    
2026 38    
2027 32    
2028 33    
Thereafter 161    
Total 349    
Other contractual obligations      
Other Commitments [Line Items]      
Purchase cost $ 60 $ 58 $ 62