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Commitments and Contingencies (Gas Supply Contracts) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2016
USD ($)
Natural Gas Supply and Capacity Contracts [Member]  
Long-term Purchase Commitment [Line Items]  
2017 $ 371
2018 308
2019 286
2020 269
2021 267
Thereafter 1,595
Total $ 3,096
Maximum [Member] | Pipeline and Storage Capacity Contracts [Member]  
Long-term Purchase Commitment [Line Items]  
Long-term Purchase Commitment, Period 19 years
Maximum [Member] | Natural Gas Supply Contract Fixed Payments [Member]  
Long-term Purchase Commitment [Line Items]  
Long-term Purchase Commitment, Period 3 years
Maximum [Member] | Natural Gas Supply Contract Commitment [Member]  
Long-term Purchase Commitment [Line Items]  
Long-term Purchase Commitment, Period 15 years
Duke Energy Ohio [Member] | Natural Gas Supply and Capacity Contracts [Member]  
Long-term Purchase Commitment [Line Items]  
2017 $ 52
2018 35
2019 26
2020 22
2021 22
Thereafter 7
Total $ 164
Duke Energy Ohio [Member] | Maximum [Member] | Pipeline and Storage Capacity Contracts [Member]  
Long-term Purchase Commitment [Line Items]  
Long-term Purchase Commitment, Period 19 years
Duke Energy Ohio [Member] | Maximum [Member] | Natural Gas Supply Contract Fixed Payments [Member]  
Long-term Purchase Commitment [Line Items]  
Long-term Purchase Commitment, Period 3 years
Duke Energy Ohio [Member] | Maximum [Member] | Natural Gas Supply Contract Commitment [Member]  
Long-term Purchase Commitment [Line Items]  
Long-term Purchase Commitment, Period 15 years