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Asset Retirement Obligations (NDTF Information) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
NDTF Information [Abstract] |  |
Annual funding requirement | $ 24 |
Decommissioning costs | 8,737 |
Legally restricted NDTF investments, fair value | 5,579 | $ 5,864
Duke Energy Carolinas [Member] |  |
NDTF Information [Abstract] |  |
Decommissioning costs | 4,291 |
Legally restricted NDTF investments, fair value | 3,133 | 3,321
Progress Energy [Member] |  |
NDTF Information [Abstract] |  |
Annual funding requirement | 24 |
Decommissioning costs | 4,446 |
Legally restricted NDTF investments, fair value | 2,446 | 2,543
Duke Energy Progress [Member] |  |
NDTF Information [Abstract] |  |
Annual funding requirement | 24 |
Decommissioning costs | 3,550 |
Legally restricted NDTF investments, fair value | 2,446 | $ 2,543
Duke Energy Florida [Member] |  |
NDTF Information [Abstract] |  |
Decommissioning costs | $ 896 |

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- Definition Carrying amount of an asset that is legally restricted for purposes of settling an asset retirement obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of a decommissioning liability associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service. This may include operating assets such as nuclear power plants or shipping vessels. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.Y.Q2) -URI http://asc.fasb.org/extlink&oid=27011672&loc=d3e149879-122751 + Details
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