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Commitments and Contingencies - Narrative Nuclear Insurance (Details) - USD ($)
$ in Millions
Jan. 01, 2024
Dec. 31, 2023
Long-term Purchase Commitment [Line Items]    
Secondary financial protection pool, maximum assessment paid per operating licensed reactor in the event of any single nuclear liability loss   $ 165.9
Secondary financial protection pool, maximum assessment paid per operating licensed reactor in the event of any single nuclear liability loss, annual   24.7
Nuclear decontamination and property insurance, maximum coverage   2,250.0
Non-nuclear property damage insurance, maximum coverage   1,000.0
Non-nuclear property damage insurance, deductible per accident, general   5.0
Non-nuclear property damage insurance, deductible per incident, natural hazard   9.5
Accidental outage insurance, coverage for obtaining replacement energy after 12 week waiting period, maximum weekly coverage, first 52 weeks   4.5
Accidental outage insurance, coverage for obtaining replacement energy after 12 week waiting period, maximum weekly payments, remaining 26 weeks non-nuclear and 71 weeks nuclear property   3.6
Accidental outage insurance, coverage for obtaining replacement energy, coverage limit for non-nuclear accidents   328.0
Accidental outage insurance, coverage for obtaining replacement energy, coverage limit for nuclear accidents   $ 490.0
Accidental outage insurance, coverage for obtaining replacement energy after 12 week waiting period, maximum percent of coverage if both units out of service   80.00%
Vistra Corp.    
Long-term Purchase Commitment [Line Items]    
Secondary financial protection pool, maximum assessment paid in the event of any single nuclear liability loss   $ 331.8
Secondary financial protection pool, maximum assessment paid in the event of any single nuclear liability loss, annual   49.4
Section 170 (Price-Anderson) of the Atomic Energy Act    
Long-term Purchase Commitment [Line Items]    
Nuclear insurance, annual coverage limit   16,200.0
Secondary financial protection pool, maximum single nuclear liability loss triggering assessment   450.0
Section 170 (Price-Anderson) of the Atomic Energy Act | Subsequent Event    
Long-term Purchase Commitment [Line Items]    
Secondary financial protection pool, maximum single nuclear liability loss triggering assessment $ 500.0  
United States Nuclear Regulatory Commission    
Long-term Purchase Commitment [Line Items]    
Nuclear decontamination and property insurance, maximum coverage   $ 1,060.0