Derivatives and Hedging (Schedule of Offsetting Assets) (Details) - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 525	$ 795
Derivative Asset, Current	144	518
Net amounts presented in Current Assets: Other	304	116
Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	161	582
Offset	$ (17)	(33)
Cash collateral received		$ 31
Derivative Asset, Current, Statement of Financial Position [Extensible Enumeration]	Current Assets: Other	Current Assets: Other
Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 364	$ 213
Offset	$ (60)	(59)
Cash collateral received		$ 38
Derivative Asset, Noncurrent, Statement of Financial Position [Extensible Enumeration]	Other	Other
Duke Energy Carolinas
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 93	$ 330
Derivative Asset, Current	28	193
Net amounts presented in Current Assets: Other	24	64
Duke Energy Carolinas \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	37	226
Offset	(9)	(15)
Cash collateral received		18
Duke Energy Carolinas \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	56	104
Offset	(32)	(29)
Cash collateral received		11
Progress Energy
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	196	248
Derivative Asset, Current	84	110
Net amounts presented in Current Assets: Other	76	51
Progress Energy \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	92	140
Offset	(8)	(18)
Cash collateral received		12
Progress Energy \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	104	108
Offset	(28)	(30)
Cash collateral received		27
Duke Energy Progress
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	79	230
Derivative Asset, Current	1	92
Net amounts presented in Current Assets: Other	42	51
Duke Energy Progress \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	9	122
Offset	(8)	(18)
Cash collateral received		12
Duke Energy Progress \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	70	108
Offset	(28)	(30)
Cash collateral received		27
Duke Energy Florida
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	117	17
Derivative Asset, Current	83	17
Net amounts presented in Current Assets: Other	34
Duke Energy Florida \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	83	17
Duke Energy Florida \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	34
Duke Energy Ohio
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	5
Derivative Asset, Current	2	5
Duke Energy Ohio \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	2	5
Duke Energy Indiana
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	55	110
Derivative Asset, Current	28	110
Net amounts presented in Current Assets: Other	27
Duke Energy Indiana \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	28	$ 110
Duke Energy Indiana \| Noncurrent assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	27
Piedmont
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	1
Derivative Asset, Current	1
Piedmont \| Current assets
Offsetting Derivative Assets [Abstract]
Gross amounts recognized	$ 1

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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