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Commitments and Contingencies - Other commitments (Details) - SCE - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Commitments [Line Items]      
2025 $ 62    
2026 59    
2027 59    
2028 59    
2029 48    
Thereafter 142    
Total 429    
Other contractual obligations      
Other Commitments [Line Items]      
Purchase cost $ 65 $ 60 $ 58