Debt Instrument, Interest Rate Reset Period

No definition available.

Name:	duk_DebtInstrumentInterestRateResetPeriod
Namespace Prefix:	duk_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 1B
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
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-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 50
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Reference 5: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69C
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495737-112612

Reference 6: http://www.xbrl.org/2003/role/exampleRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 55
-Paragraph 69B
-URI http://asc.fasb.org/extlink&oid=123466577&loc=SL123495735-112612

+ Details

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

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfLongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Debt and Credit Facilities (Summary of Debt Issuances) (Details) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Debt Instrument [Line Items]
Debt issuances	$ 5,950,000,000
Repayments of long-term debt	3,696,000,000	$ 3,468,000,000
Duke Energy (Parent)
Debt Instrument [Line Items]
Debt issuances	3,500,000,000
Repayments of long-term debt	1,750,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Debt issuances	1,000,000,000
Repayments of long-term debt	616,000,000	457,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Debt issuances	1,100,000,000
Repayments of long-term debt	605,000,000	$ 985,000,000
Piedmont
Debt Instrument [Line Items]
Debt issuances	350,000,000
Repayments of long-term debt	160,000,000
Unsecured Debt
Debt Instrument [Line Items]
Repayments of long-term debt	$ 160,000,000
Unsecured Debt \| March 2021 Notes Due March 2031
Debt Instrument [Line Items]
Interest Rate	2.50%
Debt issuances	$ 350,000,000
Unsecured Debt \| June 2021 Notes Due June 2023
Debt Instrument [Line Items]
Interest Rate	2.50%
Debt issuances	$ 500,000,000
Unsecured Debt \| June 2021 Notes Due June 2031
Debt Instrument [Line Items]
Interest Rate	2.55%
Debt issuances	$ 1,000,000,000
Unsecured Debt \| June 2021 Notes Due June 2041
Debt Instrument [Line Items]
Interest Rate	3.30%
Debt issuances	$ 750,000,000
Unsecured Debt \| June 2021 Notes Due June 2051
Debt Instrument [Line Items]
Interest Rate	3.50%
Debt issuances	$ 750,000,000
Unsecured Debt \| September 2021 Notes Due September 2081
Debt Instrument [Line Items]
Interest Rate	3.25%
Debt issuances	$ 500,000,000
Repayments of long-term debt	$ 500,000,000
Interest rate reset period	5 years
Unsecured Debt \| Duke Energy (Parent) \| June 2021 Notes Due June 2023
Debt Instrument [Line Items]
Debt issuances	$ 500,000,000
Unsecured Debt \| Duke Energy (Parent) \| June 2021 Notes Due June 2031
Debt Instrument [Line Items]
Debt issuances	1,000,000,000
Unsecured Debt \| Duke Energy (Parent) \| June 2021 Notes Due June 2041
Debt Instrument [Line Items]
Debt issuances	750,000,000
Unsecured Debt \| Duke Energy (Parent) \| June 2021 Notes Due June 2051
Debt Instrument [Line Items]
Debt issuances	750,000,000
Unsecured Debt \| Duke Energy (Parent) \| September 2021 Notes Due September 2081
Debt Instrument [Line Items]
Debt issuances	500,000,000
Unsecured Debt \| Piedmont \| March 2021 Notes Due March 2031
Debt Instrument [Line Items]
Debt issuances	$ 350,000,000
First Mortgage Bonds \| April 2021 Notes Due April 2031
Debt Instrument [Line Items]
Interest Rate	2.55%
Debt issuances	$ 550,000,000
First Mortgage Bonds \| April 2021 Notes Due April 2051
Debt Instrument [Line Items]
Interest Rate	3.45%
Debt issuances	$ 450,000,000
First Mortgage Bonds \| August 2021 Notes Due August 2031
Debt Instrument [Line Items]
Interest Rate	2.00%
Debt issuances	$ 650,000,000
First Mortgage Bonds \| August 2021 Notes Due August 2051
Debt Instrument [Line Items]
Interest Rate	2.90%
Debt issuances	$ 450,000,000
First Mortgage Bonds \| Duke Energy Carolinas \| April 2021 Notes Due April 2031
Debt Instrument [Line Items]
Debt issuances	550,000,000
First Mortgage Bonds \| Duke Energy Carolinas \| April 2021 Notes Due April 2051
Debt Instrument [Line Items]
Debt issuances	450,000,000
First Mortgage Bonds \| Duke Energy Carolinas \| Bonds maturing June 2021, 3.900% interest rate
Debt Instrument [Line Items]
Repayments of long-term debt	500,000,000
First Mortgage Bonds \| Duke Energy Progress
Debt Instrument [Line Items]
Repayments of long-term debt	600,000,000
First Mortgage Bonds \| Duke Energy Progress \| August 2021 Notes Due August 2031
Debt Instrument [Line Items]
Debt issuances	650,000,000
First Mortgage Bonds \| Duke Energy Progress \| August 2021 Notes Due August 2051
Debt Instrument [Line Items]
Debt issuances	$ 450,000,000