XML 219 R107.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Asset Retirement Obligations (NDTF Information) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2018
NDTF Information [Abstract] |  |
Annual funding requirement | $ 24 |
Decommissioning costs | 9,152 |
Legally restricted NDTF investments, fair value | 6,766 | $ 5,579
Duke Energy Carolinas |  |
NDTF Information [Abstract] |  |
Decommissioning costs | 4,365 |
Legally restricted NDTF investments, fair value | 3,837 | 3,133
Duke Energy Progress |  |
NDTF Information [Abstract] |  |
Annual funding requirement | 24 |
Decommissioning costs | 4,181 |
Legally restricted NDTF investments, fair value | 2,929 | $ 2,446
Duke Energy Florida |  |
NDTF Information [Abstract] |  |
Decommissioning costs | $ 606 |

X
- Definition Contribution and expense amounts for decommissioning costs required by each entity's state regulatory commission. + References No definition available. + Details
Name: | duk_ContributionAndExpenseAmountsForDecommissioning
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- 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
Name: | us-gaap_AssetRetirementObligationLegallyRestrictedAssetsFairValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- 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associated with a legal obligation that a firm incurs when it constructs or operates an asset that must eventually be withdrawn from active service.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
Name: | us-gaap_DecommissioningLiabilityNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
Name: | us-gaap_OtherUtilityBalanceSheetAccountsAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyCarolinasMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyProgressMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | dei_LegalEntityAxis=duk_DukeEnergyFloridaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |