Employee Benefit Plans (Expected Benefit Payments) (Details) $ in Millions	Dec. 31, 2021 USD ($)
Pension Plan \| Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	$ 652
2023	653
2024	645
2025	632
2026	605
2027-2031	2,705
Pension Plan \| Duke Energy Carolinas \| Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	174
2023	173
2024	171
2025	168
2026	155
2027-2031	655
Pension Plan \| Progress Energy \| Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	177
2023	180
2024	181
2025	180
2026	176
2027-2031	818
Pension Plan \| Duke Energy Progress \| Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	95
2023	97
2024	96
2025	94
2026	90
2027-2031	389
Pension Plan \| Duke Energy Florida \| Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	81
2023	82
2024	84
2025	85
2026	86
2027-2031	426
Pension Plan \| Duke Energy Ohio \| Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	37
2023	36
2024	35
2025	34
2026	33
2027-2031	149
Pension Plan \| Duke Energy Indiana \| Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	48
2023	48
2024	47
2025	47
2026	45
2027-2031	218
Pension Plan \| Piedmont \| Qualified Plan
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	27
2023	24
2024	23
2025	20
2026	21
2027-2031	85
Other Post-Retirement Benefit Plans
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	70
2023	62
2024	58
2025	54
2026	50
2027-2031	207
Other Post-Retirement Benefit Plans \| Duke Energy Carolinas
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	17
2023	15
2024	14
2025	13
2026	12
2027-2031	50
Other Post-Retirement Benefit Plans \| Progress Energy
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	26
2023	25
2024	23
2025	22
2026	21
2027-2031	87
Other Post-Retirement Benefit Plans \| Duke Energy Progress
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	15
2023	14
2024	13
2025	12
2026	12
2027-2031	49
Other Post-Retirement Benefit Plans \| Duke Energy Florida
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	12
2023	11
2024	11
2025	10
2026	9
2027-2031	38
Other Post-Retirement Benefit Plans \| Duke Energy Ohio
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	3
2023	3
2024	3
2025	2
2026	2
2027-2031	8
Other Post-Retirement Benefit Plans \| Duke Energy Indiana
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	7
2023	6
2024	6
2025	5
2026	5
2027-2031	19
Other Post-Retirement Benefit Plans \| Piedmont
Defined Benefit Plan, Expected Future Benefit Payment [Abstract]
2022	2
2023	2
2024	2
2025	2
2026	2
2027-2031	$ 10

No definition available.

Name:	us-gaap_DefinedBenefitPlanEstimatedFutureBenefitPaymentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of benefit for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following current fiscal year.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (f)
-URI http://asc.fasb.org/extlink&oid=123447040&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsFiveFiscalYearsThereafter
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefit for defined benefit plan expected to be paid in next fiscal year following current fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsNextTwelveMonths
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefit for defined benefit plan expected to be paid in fifth fiscal year following current fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFive
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefit for defined benefit plan expected to be paid in fourth fiscal year following current fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearFour
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefit for defined benefit plan expected to be paid in third fiscal year following current fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearThree
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of benefit for defined benefit plan expected to be paid in second fiscal year following current fiscal year.

+ References

+ Details

Name:	us-gaap_DefinedBenefitPlanExpectedFutureBenefitPaymentsYearTwo
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_PensionPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTaxStatusAxis=us-gaap_QualifiedPlanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyCarolinasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_ProgressEnergyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyProgressMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyFloridaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyOhioMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_DukeEnergyIndianaMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	dei_LegalEntityAxis=duk_PiedmontNaturalGasMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RetirementPlanTypeAxis=us-gaap_OtherPostretirementBenefitPlansDefinedBenefitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: