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Commitments and Contingencies (Gas Supply Contracts) (Details) - Natural Gas Supply and Capacity Contracts
$ in Millions
Dec. 31, 2023
USD ($)
Duke Energy Ohio  
Long-term Purchase Commitment [Line Items]  
2024 $ 103
2025 87
2026 57
2027 53
2028 51
Thereafter 574
Total 925
Piedmont  
Long-term Purchase Commitment [Line Items]  
2024 295
2025 287
2026 268
2027 209
2028 186
Thereafter 373
Total $ 1,618