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Commitments and Contingent Liabilities - Nuclear Insurance Coverages and Assessments (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Loss Contingencies [Line Items]  
Maximum Aggregate Assessment Per Incident $ 522
Maximum Aggregate Annual Assessment 78
Nuclear Insurance Aggregate Limit 3,240
Total Site Coverage for Nuclear Event [Member]  
Loss Contingencies [Line Items]  
Nuclear Liability Total 15,800
Total Site Coverage for Nuclear Event [Member] | American Nuclear Insurers [Member]  
Loss Contingencies [Line Items]  
Public And Nuclear Worker Liability Primary Layer 500
Retrospective Assessments [Member]  
Loss Contingencies [Line Items]  
Replacement Power Total $ 52