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Commitments and Contingencies (Gas Supply Contracts) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2018 USD ($)
Natural Gas Supply and Capacity Contracts [Member] |
Long-term Purchase Commitment [Line Items] |
2019 | $ 314
2020 | 287
2021 | 255
2022 | 225
2023 | 148
Thereafter | 1,067
Total | $ 2,296
Maximum [Member] | Pipeline and Storage Capacity Contracts [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Period | 16 years
Maximum [Member] | Natural Gas Supply Contract Fixed Payments [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Period | 7 years
Maximum [Member] | Natural Gas Supply Contract Commitment [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Period | 12 years
Duke Energy Ohio [Member] | Natural Gas Supply and Capacity Contracts [Member] |
Long-term Purchase Commitment [Line Items] |
2019 | $ 38
2020 | 30
2021 | 29
2022 | 11
2023 | 4
Thereafter | 0
Total | $ 112
Duke Energy Ohio [Member] | Maximum [Member] | Pipeline and Storage Capacity Contracts [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Period | 16 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 | 7 years
Duke Energy Ohio [Member] | Maximum [Member] | Natural Gas Supply Contract Commitment [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Period | 12 years
Piedmont Natural Gas [Member] | Natural Gas Supply and Capacity Contracts [Member] |
Long-term Purchase Commitment [Line Items] |
2019 | $ 276
2020 | 257
2021 | 226
2022 | 214
2023 | 144
Thereafter | 1,067
Total | $ 2,184
Piedmont Natural Gas [Member] | Maximum [Member] | Pipeline and Storage Capacity Contracts [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Period | 16 years
Piedmont Natural Gas [Member] | Maximum [Member] | Natural Gas Supply Contract Fixed Payments [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Period | 7 years
Piedmont Natural Gas [Member] | Maximum [Member] | Natural Gas Supply Contract Commitment [Member] |
Long-term Purchase Commitment [Line Items] |
Long-term Purchase Commitment, Period | 12 years

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- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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- Definition Amount of the fixed and determinable portion of the unrecorded unconditional purchase obligation maturing in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -SubTopic 10 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77896938&loc=d3e25336-109308 + Details
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