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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS , UTILITY (Parenthetical) - USD ($)
$ in Millions
 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Issuance costs for short-term debt $ 0 $ 1
Premium, discount, and issuance costs on proceeds from long-term debt 27 13
Utility    
Issuance costs for short-term debt 0 1
Premium, discount, and issuance costs on proceeds from long-term debt 27 9
Wildfire Fund    
Financing fees 0 10
Wildfire Fund | Utility    
Financing fees $ 0 $ 10