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Intangible Assets - Components Subject to Amortization (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finite-lived Intangible Assets [Roll Forward]      
Net carrying amount beginning balance $ 3,387 $ 3,383 $ 3,442
Net carrying amount ending balance 3,387 3,383 3,442
Less accumulated amortization (1,194) (1,009)  
Ending balance 2,193 2,374  
Walnut Creek      
Finite-lived Intangible Assets [Roll Forward]      
Expiration   (50)  
Other Acquisitions      
Finite-lived Intangible Assets [Roll Forward]      
Other 4 (9)  
PPAs      
Finite-lived Intangible Assets [Roll Forward]      
Net carrying amount beginning balance 3,265 3,265 3,321
Net carrying amount ending balance 3,265 3,265 3,321
Less accumulated amortization (1,140) (962)  
Ending balance 2,125 2,303  
PPAs | Walnut Creek      
Finite-lived Intangible Assets [Roll Forward]      
Expiration   (50)  
PPAs | Other Acquisitions      
Finite-lived Intangible Assets [Roll Forward]      
Other 0 (6)  
Leasehold Rights      
Finite-lived Intangible Assets [Roll Forward]      
Net carrying amount beginning balance 86 86 86
Net carrying amount ending balance 86 86 86
Less accumulated amortization (42) (38)  
Ending balance 44 48  
Leasehold Rights | Walnut Creek      
Finite-lived Intangible Assets [Roll Forward]      
Expiration   0  
Leasehold Rights | Other Acquisitions      
Finite-lived Intangible Assets [Roll Forward]      
Other 0 0  
Emission Allowances      
Finite-lived Intangible Assets [Roll Forward]      
Net carrying amount beginning balance 17 17 17
Net carrying amount ending balance 17 17 17
Less accumulated amortization (5) (4)  
Ending balance 12 13  
Emission Allowances | Walnut Creek      
Finite-lived Intangible Assets [Roll Forward]      
Expiration   0  
Emission Allowances | Other Acquisitions      
Finite-lived Intangible Assets [Roll Forward]      
Other 0 0  
Other      
Finite-lived Intangible Assets [Roll Forward]      
Net carrying amount beginning balance 19 15 18
Net carrying amount ending balance 19 15 $ 18
Less accumulated amortization (7) (5)  
Ending balance 12 10  
Other | Walnut Creek      
Finite-lived Intangible Assets [Roll Forward]      
Expiration   0  
Other | Other Acquisitions      
Finite-lived Intangible Assets [Roll Forward]      
Other $ 4 $ (3)