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Commitments and Contingencies (Gas Supply Contracts) (Details) - Natural Gas Supply and Capacity Contracts
$ in Millions
Dec. 31, 2025
USD ($)
Duke Energy Ohio  
Long-term Purchase Commitment [Line Items]  
2026 $ 133
2027 136
2028 135
2029 131
2030 118
Thereafter 828
Total 1,481
Piedmont  
Long-term Purchase Commitment [Line Items]  
2026 414
2027 400
2028 335
2029 265
2030 262
Thereafter 605
Total $ 2,281