XML 103 R61.htm IDEA: XBRL DOCUMENT
v3.10.0.1

Asset Retirement Obligations (ARO by Category) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Asset Retirement Obligations [Line Items] |  |
Total ARO | $ 10,256 | $ 10,175
Less: current portion | 902 | 689
Total noncurrent ARO | 9,354 | 9,486
Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,712 | 3,610
Less: current portion | 292 | 337
Total noncurrent ARO | 3,420 | 3,273
Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,435 | 5,414
Less: current portion | 475 | 295
Total noncurrent ARO | 4,960 | 5,119
Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 4,841 | 4,673
Less: current portion | 470 | 295
Total noncurrent ARO | 4,371 | 4,378
Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 593 | 742
Less: current portion | 4 |
Total noncurrent ARO | 589 | 742
Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 98 | 84
Less: current portion | 7 | 3
Total noncurrent ARO | 91 | 81
Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 744 | 781
Less: current portion | 128 | 54
Total noncurrent ARO | 616 | 727
Piedmont Natural Gas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 15 | 15
Total noncurrent ARO | 15 | $ 15
Decommissioning of Nuclear Power Facilities [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,367 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,031 |
Decommissioning of Nuclear Power Facilities [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,181 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,650 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 531 |
Closure of Ash Impoundments [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 4,575 |
Closure of Ash Impoundments [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 1,623 |
Closure of Ash Impoundments [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,175 |
Closure of Ash Impoundments [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,154 |
Closure of Ash Impoundments [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 20 |
Closure of Ash Impoundments [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 52 |
Closure of Ash Impoundments [Member] | Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 725 |
Other [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 314 |
Other [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 58 |
Other [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 79 |
Other [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 37 |
Other [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 42 |
Other [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 46 |
Other [Member] | Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 19 |
Other [Member] | Piedmont Natural Gas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | $ 15 |

X
- Definition [Line Items] for Information and financial data about asset retirement obligations. + References No definition available. + Details
Name: | duk_AssetRetirementObligationsLineItems
Namespace Prefix: | duk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationCurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Noncurrent portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + 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 (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
Name: | us-gaap_AssetRetirementObligationsNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Details
Name: | dei_LegalEntityAxis=duk_ProgressEnergyMember
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: |

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

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

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

X
- Details
Name: | duk_AROBalanceCategoryAxis=duk_DecommissioningofNuclearPowerFacilitiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | duk_AROBalanceCategoryAxis=duk_ClosureofAshBasinsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | duk_AROBalanceCategoryAxis=duk_OtherMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |