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

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 55
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=114775985&loc=d3e28878-108400

+ Details

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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

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 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num: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

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentTerm
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
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=121586364&loc=d3e3291-108585

+ Details

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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, 2020	Sep. 30, 2019
Debt Instrument [Line Items]
Debt issuances	$ 5,550,000,000
Repayments of long-term debt	3,468,000,000	$ 2,737,000,000
Duke Energy (Parent)
Debt Instrument [Line Items]
Debt issuances	1,500,000,000
Duke Energy (Parent) \| Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of long-term debt	500,000,000
Duke Energy Carolinas
Debt Instrument [Line Items]
Debt issuances	900,000,000
Repayments of long-term debt	457,000,000	5,000,000
Duke Energy Progress
Debt Instrument [Line Items]
Debt issuances	1,300,000,000
Repayments of long-term debt	985,000,000	603,000,000
Duke Energy Florida
Debt Instrument [Line Items]
Debt issuances	500,000,000
Repayments of long-term debt	570,000,000	210,000,000
Duke Energy Ohio
Debt Instrument [Line Items]
Debt issuances	400,000,000
Repayments of long-term debt		451,000,000
Duke Energy Indiana
Debt Instrument [Line Items]
Debt issuances	550,000,000
Repayments of long-term debt	500,000,000	60,000,000
Piedmont Natural Gas
Debt Instrument [Line Items]
Debt issuances	$ 400,000,000
Repayments of long-term debt		$ 350,000,000
Unsecured Debt \| May 2020 2.450% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.45%
Debt issuances	$ 500,000,000
Unsecured Debt \| May 2020 3.350% Due 2050
Debt Instrument [Line Items]
Interest Rate	3.35%
Debt issuances	$ 400,000,000
Unsecured Debt \| August 2020 0.450% Due 2022
Debt Instrument [Line Items]
Interest Rate	0.43%
Debt issuances	$ 700,000,000
Facility term	2 years
Unsecured Debt \| September 2020 0.900% Due 2025
Debt Instrument [Line Items]
Interest Rate	0.90%
Debt issuances	$ 650,000,000
Unsecured Debt \| September 2020 2.450% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.45%
Debt issuances	$ 350,000,000
Unsecured Debt \| Duke Energy (Parent) \| May 2020 2.450% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
Unsecured Debt \| Duke Energy (Parent) \| September 2020 0.900% Due 2025
Debt Instrument [Line Items]
Debt issuances	650,000,000
Unsecured Debt \| Duke Energy (Parent) \| September 2020 2.450% Due 2030
Debt Instrument [Line Items]
Debt issuances	350,000,000
Unsecured Debt \| Duke Energy (Parent) \| Term loan due March 2021
Debt Instrument [Line Items]
Repayments of long-term debt	1,700,000,000
Unsecured Debt \| Duke Energy Progress \| August 2020 0.450% Due 2022
Debt Instrument [Line Items]
Debt issuances	700,000,000
Unsecured Debt \| Duke Energy Progress \| Two-year term loan facility expiring in December 2020
Debt Instrument [Line Items]
Repayments of long-term debt	700,000,000
Unsecured Debt \| Piedmont Natural Gas \| May 2020 3.350% Due 2050
Debt Instrument [Line Items]
Debt issuances	$ 400,000,000
First Mortgage Bonds \| January 2020 2.450% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.45%
Debt issuances	$ 500,000,000
First Mortgage Bonds \| January 2020 3.20% Due 2049
Debt Instrument [Line Items]
Interest Rate	3.20%
Debt issuances	$ 400,000,000
First Mortgage Bonds \| March 2020 2.750% Due 2050
Debt Instrument [Line Items]
Interest Rate	2.75%
Debt issuances	$ 550,000,000
First Mortgage Bonds \| May 2020 2.125% Due 2030
Debt Instrument [Line Items]
Interest Rate	2.125%
Debt issuances	$ 400,000,000
First Mortgage Bonds \| June 2020 1.750% Due 2030
Debt Instrument [Line Items]
Interest Rate	1.75%
Debt issuances	$ 500,000,000
First Mortgage Bonds \| August 2020 2.500% Due 2050
Debt Instrument [Line Items]
Interest Rate	2.50%
Debt issuances	$ 600,000,000
First Mortgage Bonds \| Duke Energy Carolinas \| January 2020 2.450% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
First Mortgage Bonds \| Duke Energy Carolinas \| January 2020 3.20% Due 2049
Debt Instrument [Line Items]
Debt issuances	400,000,000
First Mortgage Bonds \| Duke Energy Carolinas \| First mortgage bonds due June 2020
Debt Instrument [Line Items]
Repayments of long-term debt	450,000,000
First Mortgage Bonds \| Duke Energy Progress \| August 2020 2.500% Due 2050
Debt Instrument [Line Items]
Debt issuances	600,000,000
First Mortgage Bonds \| Duke Energy Progress \| First mortgage bonds due September 2020
Debt Instrument [Line Items]
Repayments of long-term debt	300,000,000
First Mortgage Bonds \| Duke Energy Florida \| June 2020 1.750% Due 2030
Debt Instrument [Line Items]
Debt issuances	500,000,000
First Mortgage Bonds \| Duke Energy Ohio \| May 2020 2.125% Due 2030
Debt Instrument [Line Items]
Debt issuances	400,000,000
First Mortgage Bonds \| Duke Energy Indiana \| March 2020 2.750% Due 2050
Debt Instrument [Line Items]
Debt issuances	550,000,000
First Mortgage Bonds \| Duke Energy Indiana \| First mortgage bonds due July 2020
Debt Instrument [Line Items]
Repayments of long-term debt	$ 500,000,000