XML 143 R104.htm IDEA: XBRL DOCUMENT
v3.22.2

Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2022 | Dec. 31, 2021
--- | --- | ---
Debt Securities, Available-for-sale |  |
Estimated Fair Value | $ 2,968 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 3,522 | $ 5,033
Unrealized Holding Losses | 397 | 66
Estimated Fair Value | 9,028 | 10,893
Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,343 |
Progress Energy |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,376 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 1,443 | 2,062
Unrealized Holding Losses | 166 | 36
Estimated Fair Value | 3,891 | 4,688
Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 994 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 1,364 | 1,957
Unrealized Holding Losses | 144 | 29
Estimated Fair Value | 3,385 | 4,105
Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 382 |
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 79 | 105
Unrealized Holding Losses | 22 | 7
Estimated Fair Value | 504 | 582
Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 61 |
NDTF |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 134 | 160
Equity Securities, FV-NI |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 3,500 | 4,905
Equity Securities, FV-NI, Accumulated Unrealized Loss | 141 | 43
Equity securities, FV-NI | 5,751 | 7,350
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 2,694 | 2,891
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 3,502 | 4,992
Unrealized Holding Losses | 357 | 63
Estimated Fair Value | 8,579 | 10,401
NDTF | Duke Energy Carolinas |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 58 | 53
Equity Securities, FV-NI |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 2,058 | 2,887
Equity Securities, FV-NI, Accumulated Unrealized Loss | 69 | 19
Equity securities, FV-NI | 3,327 | 4,265
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,343 | 1,441
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2,059 | 2,932
Unrealized Holding Losses | 191 | 27
Estimated Fair Value | 4,728 | 5,759
NDTF | Progress Energy |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 76 | 107
Equity Securities, FV-NI |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 1,442 | 2,018
Equity Securities, FV-NI, Accumulated Unrealized Loss | 72 | 24
Equity securities, FV-NI | 2,424 | 3,085
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 1,351 | 1,450
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 1,443 | 2,060
Unrealized Holding Losses | 166 | 36
Estimated Fair Value | 3,851 | 4,642
NDTF | Duke Energy Progress |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 46 | 94
Equity Securities, FV-NI |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 1,363 | 1,915
Equity Securities, FV-NI, Accumulated Unrealized Loss | 72 | 23
Equity securities, FV-NI | 2,333 | 2,970
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 994 | 1,025
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 1,364 | 1,957
Unrealized Holding Losses | 144 | 29
Estimated Fair Value | 3,373 | 4,089
NDTF | Duke Energy Florida |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 30 | 13
Equity Securities, FV-NI |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 79 | 103
Equity Securities, FV-NI, Accumulated Unrealized Loss |  | 1
Equity securities, FV-NI | 91 | 115
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 357 | 425
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 79 | 103
Unrealized Holding Losses | 22 | 7
Estimated Fair Value | 478 | 553
Other Investments |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 51 | 36
Equity Securities, FV-NI |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 20 | 36
Equity Securities, FV-NI, Accumulated Unrealized Loss | 17 |
Equity securities, FV-NI | 124 | 156
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 274 | 300
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 20 | 41
Unrealized Holding Losses | 40 | 3
Estimated Fair Value | 449 | 492
Other Investments | Progress Energy |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 15 | 20
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 25 | 26
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains |  | 2
Estimated Fair Value | 40 | 46
Other Investments | Duke Energy Progress |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 12 | 16
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Estimated Fair Value | 12 | 16
Other Investments | Duke Energy Florida |  |
Available-for-sale Securities |  |
Cash and cash equivalents | 1 | 3
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 25 | 26
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains |  | 2
Estimated Fair Value | 26 | 29
Other Investments | Duke Energy Indiana |  |
Equity Securities, FV-NI |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 2 | 6
Equity Securities, FV-NI, Accumulated Unrealized Loss | 17 |
Equity securities, FV-NI | 77 | 97
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 61 | 64
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |  |
Unrealized Holding Gains | 2 | 7
Unrealized Holding Losses | 20 | 1
Estimated Fair Value | 138 | 161
Corporate debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 39
Gross Unrealized Holding Losses | 81 | 6
Estimated Fair Value | 728 | 829
Corporate debt securities | NDTF | Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 24
Gross Unrealized Holding Losses | 63 | 4
Estimated Fair Value | 470 | 506
Corporate debt securities | NDTF | Progress Energy |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 15
Gross Unrealized Holding Losses | 18 | 2
Estimated Fair Value | 258 | 323
Corporate debt securities | NDTF | Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 15
Gross Unrealized Holding Losses | 17 | 2
Estimated Fair Value | 241 | 282
Corporate debt securities | NDTF | Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 |
Estimated Fair Value | 17 | 41
Corporate debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 2
Gross Unrealized Holding Losses | 13 | 1
Estimated Fair Value | 108 | 119
Corporate debt securities | Other Investments | Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 8 | 6
Municipal bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 14
Gross Unrealized Holding Losses | 32 | 1
Estimated Fair Value | 334 | 314
Municipal bonds | NDTF | Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 2
Gross Unrealized Holding Losses | 9 |
Estimated Fair Value | 63 | 48
Municipal bonds | NDTF | Progress Energy |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 12
Gross Unrealized Holding Losses | 23 | 1
Estimated Fair Value | 271 | 266
Municipal bonds | NDTF | Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 12
Gross Unrealized Holding Losses | 23 | 1
Estimated Fair Value | 271 | 266
Municipal bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 3
Gross Unrealized Holding Losses | 3 | 1
Estimated Fair Value | 82 | 80
Municipal bonds | Other Investments | Progress Energy |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 2
Estimated Fair Value | 25 | 26
Municipal bonds | Other Investments | Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 2
Estimated Fair Value | 25 | 26
Municipal bonds | Other Investments | Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 1
Gross Unrealized Holding Losses | 3 | 1
Estimated Fair Value | 48 | 46
U.S. government bonds | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 2 | 31
Gross Unrealized Holding Losses | 89 | 12
Estimated Fair Value | 1,462 | 1,568
U.S. government bonds | NDTF | Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 16
Gross Unrealized Holding Losses | 37 | 3
Estimated Fair Value | 645 | 712
U.S. government bonds | NDTF | Progress Energy |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 15
Gross Unrealized Holding Losses | 52 | 9
Estimated Fair Value | 817 | 856
U.S. government bonds | NDTF | Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains | 1 | 15
Gross Unrealized Holding Losses | 31 | 3
Estimated Fair Value | 477 | 472
U.S. government bonds | NDTF | Duke Energy Florida |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 21 | 6
Estimated Fair Value | 340 | 384
U.S. government bonds | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 5 |
Estimated Fair Value | 49 | 56
U.S. government bonds | Other Investments | Duke Energy Indiana |  |
Debt Securities, Available-for-sale |  |
Estimated Fair Value | 5 | 12
Other debt securities | NDTF |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 3
Gross Unrealized Holding Losses | 14 | 1
Estimated Fair Value | 170 | 180
Other debt securities | NDTF | Duke Energy Carolinas |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Gains |  | 3
Gross Unrealized Holding Losses | 13 | 1
Estimated Fair Value | 165 | 175
Other debt securities | NDTF | Progress Energy |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 |
Estimated Fair Value | 5 | 5
Other debt securities | NDTF | Duke Energy Progress |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 1 |
Estimated Fair Value | 5 | 5
Other debt securities | Other Investments |  |
Debt Securities, Available-for-sale |  |
Gross Unrealized Holding Losses | 2 | 1
Estimated Fair Value | $ 35 | $ 45

X
- Definition Available-for-sale Securities, Accumulated Gross Unrealized Gains (Loses)1 [Abstract] + References No definition available. + Details
Name: | duk_AvailableforsaleSecuritiesAccumulatedGrossUnrealizedGainsLoses1Abstract
Namespace Prefix: | duk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of cash and cash equivalents held in a trust fund or other type of investment. + References No definition available. + Details
Name: | duk_CashAndCashEquivalentInvestments
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading + References No definition available. + Details
Name: | duk_DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNI
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of unrealized gain on investments in debt securities measured at fair value with change in fair value recognized in OCI and equity securities measured at fair value with change in fair value recognized in net income (FV-NI). + References No definition available. + Details
Name: | duk_DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNIUnrealizedGain
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of unrealized loss on investments in debt securities measured at fair value with change in fair value recognized in OCI and equity securities measured at fair value with change in fair value recognized in net income (FV-NI) + References No definition available. + Details
Name: | duk_DebtSecuritiesAvailableforsaleandEquitySecuritiesFVNIUnrealizedLoss
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Equity Securities, FV-NI, Accumulated Gross Unrealized Gains (Losses) [Abstract] + References No definition available. + Details
Name: | duk_EquitySecuritiesFVNIAccumulatedGrossUnrealizedGainsLossesAbstract
Namespace Prefix: | duk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of accumulated unrealized gain on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Substantially all of the associated unrealized gains and losses on these investments are deferred as a regulatory asset or liability. + References No definition available. + Details
Name: | duk_EquitySecuritiesFVNIAccumulatedUnrealizedGain
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of accumulated unrealized loss on investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). Substantially all of the associated unrealized gains and losses on these investments are deferred as a regulatory asset or liability. + References No definition available. + Details
Name: | duk_EquitySecuritiesFVNIAccumulatedUnrealizedLoss
Namespace Prefix: | duk_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] + References No definition available. + Details
Name: | duk_InvestmentsAccumulatedGrossUnrealizedGainsLossesAbstract
Namespace Prefix: | duk_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleDebtSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI https://asc.fasb.org/extlink&oid=126897435&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 45 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=124258926&loc=SL82898722-210454 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=124260329&loc=d3e26610-111562 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563 + Details
Name: | us-gaap_AvailableForSaleSecuritiesDebtSecurities
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI), classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(2)) -URI https://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (f) -URI https://asc.fasb.org/extlink&oid=124098289&loc=d3e6676-107765 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 45 -Paragraph 1A -URI https://asc.fasb.org/extlink&oid=123594786&loc=SL75136599-209740 + Details
Name: | us-gaap_EquitySecuritiesFvNi
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
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_DukeEnergyIndianaMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=duk_NdtfMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentSecondaryCategorizationAxis=duk_OtherClassificationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_CorporateDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_MunicipalBondsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_USTreasuryAndGovernmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_FinancialInstrumentAxis=us-gaap_OtherDebtSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |