XML 96 R168.htm IDEA: XBRL DOCUMENT
v3.19.3.a.u2

Income Taxes (Deferred Income Taxes) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | $ 125 | $ 164
Capital lease obligations | 462 | 60
Pension, postretirement and other employee benefits | 303 | 347
Progress Energy merger purchase accounting adjustments | 389 | 483
Tax credits and NOL carryforwards | 3,925 | 4,580
Other | 97 | 25
Valuation allowance | (587) | (484)
Total deferred income tax assets | 4,714 | 5,175
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (1,664) | (1,317)
Accelerated depreciation rates | (10,813) | (10,124)
Regulatory assets and deferred debits, net | (1,115) | (1,540)
Total deferred income tax liabilities | (13,592) | (12,981)
Net deferred income tax liabilities | (8,878) | (7,806)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 3,925 | 4,580
Valuation allowance | (587) | (484)
General Business Credits |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 1,821 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 1,821 |
AMT credits |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 286 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 286 |
NOL Carryforwards | Federal |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 169 |
Valuation allowance | (4) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 169 |
Valuation allowance | (4) |
NOL Carryforwards | State |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 303 |
Valuation allowance | (97) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 303 |
Valuation allowance | (97) |
NOL Carryforwards | Foreign |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 12 |
Valuation allowance | (12) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 12 |
Valuation allowance | (12) |
Capital loss carryforwards | Federal |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 87 |
Valuation allowance | (87) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 87 |
Valuation allowance | (87) |
Foreign Tax Credit |  |
Deferred Tax Assets, Gross [Abstract] |  |
Valuation allowance | (387) |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Valuation allowance | (387) |
Foreign Tax Credit | Foreign |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 1,237 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 1,237 |
Charitable contribution carryforwards |  |
Deferred Tax Assets, Gross [Abstract] |  |
Tax credits and NOL carryforwards | 10 |
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 10 |
Duke Energy Carolinas |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 24 | 64
Capital lease obligations | 72 | 26
Pension, postretirement and other employee benefits | (5) | 24
Tax credits and NOL carryforwards | 262 | 257
Other | 5 | 6
Total deferred income tax assets | 358 | 377
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (981) | (795)
Accelerated depreciation rates | (3,254) | (3,207)
Regulatory assets and deferred debits, net | (44) | (64)
Total deferred income tax liabilities | (4,279) | (4,066)
Net deferred income tax liabilities | (3,921) | (3,689)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 262 | 257
Progress Energy |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 25 | 35
Capital lease obligations | 193 |
Pension, postretirement and other employee benefits | 88 | 110
Tax credits and NOL carryforwards | 486 | 693
Other | 8 | 5
Total deferred income tax assets | 800 | 843
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (577) | (430)
Accelerated depreciation rates | (3,798) | (3,369)
Regulatory assets and deferred debits, net | (887) | (985)
Total deferred income tax liabilities | (5,262) | (4,784)
Net deferred income tax liabilities | (4,462) | (3,941)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 486 | 693
Duke Energy Progress |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 49 | 53
Capital lease obligations | 92 |
Pension, postretirement and other employee benefits | 38 | 47
Tax credits and NOL carryforwards | 176 | 215
Other | 3 | 5
Total deferred income tax assets | 358 | 320
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (390) | (272)
Accelerated depreciation rates | (1,918) | (1,735)
Regulatory assets and deferred debits, net | (438) | (432)
Total deferred income tax liabilities | (2,746) | (2,439)
Net deferred income tax liabilities | (2,388) | (2,119)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 176 | 215
Duke Energy Florida |  |
Deferred Tax Assets, Gross [Abstract] |  |
Capital lease obligations | 102 |
Pension, postretirement and other employee benefits | 44 | 58
Tax credits and NOL carryforwards | 253 | 363
Other | 2 |
Total deferred income tax assets | 401 | 421
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (190) | (163)
Accelerated depreciation rates | (1,913) | (1,670)
Regulatory assets and deferred debits, net | (477) | (574)
Total deferred income tax liabilities | (2,580) | (2,407)
Net deferred income tax liabilities | (2,179) | (1,986)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 253 | 363
Duke Energy Ohio |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 14 | 17
Capital lease obligations | 5 |
Pension, postretirement and other employee benefits | 17 | 16
Tax credits and NOL carryforwards | 16 | 42
Regulatory liabilities and deferred credits | 36 | 56
Investments and other assets | 10 | 18
Other | 8 | 1
Total deferred income tax assets | 106 | 150
Deferred Tax Liabilities, Gross [Abstract] |  |
Accelerated depreciation rates | (1,028) | (967)
Total deferred income tax liabilities | (1,028) | (967)
Net deferred income tax liabilities | (922) | (817)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 16 | 42
Duke Energy Indiana |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 5 | 6
Capital lease obligations | 17 | 2
Pension, postretirement and other employee benefits | 27 | 24
Tax credits and NOL carryforwards | 176 | 237
Regulatory liabilities and deferred credits | 52 |
Other | 1 | (1)
Total deferred income tax assets | 278 | 268
Deferred Tax Liabilities, Gross [Abstract] |  |
Investments and other assets | (12) | (5)
Accelerated depreciation rates | (1,416) | (1,081)
Regulatory assets and deferred debits, net |  | (191)
Total deferred income tax liabilities | (1,428) | (1,277)
Net deferred income tax liabilities | (1,150) | (1,009)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | 176 | 237
Piedmont |  |
Deferred Tax Assets, Gross [Abstract] |  |
Deferred credits and other liabilities | 22 | 17
Capital lease obligations | 6 |
Pension, postretirement and other employee benefits | (3) | (1)
Tax credits and NOL carryforwards | 19 | 110
Regulatory liabilities and deferred credits | 42 | 48
Investments and other assets | 2 | 16
Other | 6 |
Total deferred income tax assets | 94 | 190
Deferred Tax Liabilities, Gross [Abstract] |  |
Accelerated depreciation rates | (802) | (733)
Other |  | (8)
Total deferred income tax liabilities | (802) | (741)
Net deferred income tax liabilities | (708) | (551)
Components and Expiration Dates of Tax Credits and NOL Carryforwards [Abstract] |  |
Tax credits and NOL carryforwards | $ 19 | $ 110

X
- Definition Amount before allocation of valuation allowance of deferred tax asset attributable to deductible temporary differences and carryforwards acquired at the acquisition date. + References No definition available. + Details
Name: | duk_DeferredTaxAssetsBusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumed
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from capital lease obligations. + References No definition available. + Details
Name: | duk_DeferredTaxAssetsCapitalLeaseObligations
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(15)(b)(2)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(15)(2)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(26)(a)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredIncomeTaxLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from investments (excludes investments in subsidiaries and equity method investments). + References No definition available. + Details
Name: | us-gaap_DeferredTaxAssetsInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b),(c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsNet
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxAssetsOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences derived regulatory assets and liabilities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxAssetsRegulatoryAssetsAndLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from compensation and benefits costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 + Details
Name: | us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefits
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount, before allocation of valuation allowance, of deferred tax asset attributable to deductible temporary differences from provisions, reserves, allowances, and accruals, classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxAssetsTaxDeferredExpenseOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxAssetsValuationAllowance
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, after deferred tax asset, of deferred tax liability attributable to taxable differences without jurisdictional netting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e31931-109318 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
Name: | us-gaap_DeferredTaxLiabilities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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

X
- Definition Amount of deferred tax liability attributable to taxable temporary differences from investments (excludes investments in subsidiaries and equity method investments). + References No definition available. + Details
Name: | us-gaap_DeferredTaxLiabilitiesInvestments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred tax liability attributable to taxable temporary differences classified as other. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 + Details
Name: | us-gaap_DeferredTaxLiabilitiesOther
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred tax liability attributable to taxable temporary differences from property, plant, and equipment. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
Name: | us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of deferred tax liability attributable to taxable temporary differences from regulatory assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 25 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=117330534&loc=d3e28680-109314 + Details
Name: | us-gaap_DeferredTaxLiabilitiesRegulatoryAssets
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The amount of the tax credit carryforward, before tax effects, available to reduce future taxable income under enacted tax laws. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 + Details
Name: | us-gaap_TaxCreditCarryforwardAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=us-gaap_GeneralBusinessMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=duk_AlternativeMinimumTaxCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=duk_NetOperatingLossCarryforwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_InternalRevenueServiceIRSMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_StateAndLocalJurisdictionMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_IncomeTaxAuthorityAxis=us-gaap_ForeignCountryMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=us-gaap_CapitalLossCarryforwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=duk_ForeignTaxCreditMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_TaxCreditCarryforwardAxis=duk_CharitableCarryforwardsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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: |