Derivatives and Hedging (Derivative Instruments with Credit-Risk Related Contingent Features and Cash Collateral) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	$ 312	$ 141
Fair value of collateral already posted	21
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	291	141
Noncurrent liabilities
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Cash collateral posted	(8)	(16)
Noncurrent assets
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(60)	(59)
Current assets
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(17)	(33)
Duke Energy Carolinas
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	175	86
Fair value of collateral already posted	19
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	156	86
Duke Energy Carolinas \| Noncurrent liabilities
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Cash collateral posted	(7)
Duke Energy Carolinas \| Noncurrent assets
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(32)	(29)
Duke Energy Carolinas \| Current assets
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(9)	(15)
Progress Energy
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	138	55
Fair value of collateral already posted	2
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	136	55
Progress Energy \| Noncurrent liabilities
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Cash collateral posted	(1)
Progress Energy \| Noncurrent assets
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(28)	(30)
Progress Energy \| Current assets
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(8)	(18)
Duke Energy Progress
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position	138	48
Fair value of collateral already posted	2
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered	136	48
Duke Energy Progress \| Noncurrent liabilities
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Cash collateral posted	(1)
Duke Energy Progress \| Noncurrent assets
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	(28)	(30)
Duke Energy Progress \| Current assets
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Derivative Asset, Subject to Master Netting Arrangement, Liability Offset	$ (8)	(18)
Duke Energy Florida
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Aggregate fair value of derivatives in a net liability position		7
Additional cash collateral or letters of credit in the event credit risk-related contingent features were triggered		7
Duke Energy Indiana \| Noncurrent liabilities
Schedule of Information Regarding Derivative Instruments That Contain Credit-Risk Related Contingent Features
Cash collateral posted		$ (16)

The aggregate fair value of additional assets that would be required to be posted as collateral for derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period.

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The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features.

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Fair value of liability associated with financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset.

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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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- Definition

The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument.

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