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Commitments and Contingencies - Schedule of Expected Recoveries From Insurance and Third Parties (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Commitments and Contingencies    
Total $ 2,113 $ 647
2017/2018 Wildfire/Mudslide Events    
Commitments and Contingencies    
Total 1,378 64
Other Wildfire Events    
Commitments and Contingencies    
Total 435 583
Long-term receivables from insurance and third parties    
Commitments and Contingencies    
Total 319 434
Long-term receivables from insurance and third parties | 2017/2018 Wildfire/Mudslide Events    
Commitments and Contingencies    
Total 0 0
Long-term receivables from insurance and third parties | Other Wildfire Events    
Commitments and Contingencies    
Total 319 434
FERC related balancing accounts    
Commitments and Contingencies    
Total 78 73
FERC related balancing accounts | 2017/2018 Wildfire/Mudslide Events    
Commitments and Contingencies    
Total 37 64
FERC related balancing accounts | Other Wildfire Events    
Commitments and Contingencies    
Total 20 9
CPUC-WEMA    
Commitments and Contingencies    
Total 1,437 140
CPUC-WEMA | 2017/2018 Wildfire/Mudslide Events    
Commitments and Contingencies    
Total 1,341 0
CPUC-WEMA | Other Wildfire Events    
Commitments and Contingencies    
Total $ 96 $ 140