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Commitments and Contingencies (Gas Supply Contracts) (Details) - Natural Gas Supply and Capacity Contracts
$ in Millions
Dec. 31, 2024
USD ($)
Duke Energy Ohio  
Long-term Purchase Commitment [Line Items]  
2025 $ 104
2026 75
2027 71
2028 69
2029 65
Thereafter 554
Total 938
Piedmont  
Long-term Purchase Commitment [Line Items]  
2025 369
2026 366
2027 322
2028 241
2029 233
Thereafter 695
Total $ 2,226