Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 671	$ 472
Net amounts presented in Current Liabilities: Other	196	173
Net amounts presented in Current Liabilities: Other	440	276
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	214	184
Gross amounts offset	$ (18)	$ (11)
Derivative Liability, Current, Statement of Financial Position [Extensible Enumeration]	Current Liabilities: Other	Current Liabilities: Other
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 457	$ 288
Gross amounts offset	$ (17)	$ (12)
Derivative Liability, Statement of Financial Position [Extensible Enumeration]	Other, noncurrent liabilities	Other, noncurrent liabilities
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 113	$ 35
Net amounts presented in Current Liabilities: Other	99	20
Net amounts presented in Current Liabilities: Other	5	1
Duke Energy Carolinas \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	99	26
Gross amounts offset		(6)
Duke Energy Carolinas \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	14	9
Gross amounts offset	(9)	(8)
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	9	24
Net amounts presented in Current Liabilities: Other		14
Progress Energy \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		19
Gross amounts offset		(5)
Progress Energy \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	9	5
Gross amounts offset	(9)	(5)
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	9	10
Duke Energy Progress \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		5
Gross amounts offset		(5)
Duke Energy Progress \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	9	5
Gross amounts offset	(9)	(5)
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		14
Net amounts presented in Current Liabilities: Other		14
Duke Energy Florida \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		14
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	3	5
Net amounts presented in Current Liabilities: Other	1	1
Net amounts presented in Current Liabilities: Other	2	4
Duke Energy Ohio \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Duke Energy Ohio \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	2	4
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	18	27
Net amounts presented in Current Liabilities: Other		13
Net amounts presented in Current Liabilities: Other		14
Duke Energy Indiana \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	18	13
Gross amounts offset	(18)
Duke Energy Indiana \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		14
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	171	139
Net amounts presented in Current Liabilities: Other	31	21
Net amounts presented in Current Liabilities: Other	140	118
Piedmont \| Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	31	21
Piedmont \| Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 140	$ 118

Fair value, before effects of master netting arrangements, of a financial liability or 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. Includes liabilities elected not to be offset. Excludes liabilities not subject to a master netting arrangement.

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