Derivatives and Hedging (Schedule of Offsetting Liabilities) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	$ 593	$ 472
Net amounts presented in Current Liabilities: Other	593	472
Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	190	184
Gross amounts offset	(19)	(11)
Net amounts presented in Current Liabilities: Other	171	173
Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	403	288
Gross amounts offset	(19)	(12)
Net amounts presented in Current Liabilities: Other	384	276
Duke Energy Carolinas
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	41	35
Net amounts presented in Current Liabilities: Other	41	35
Duke Energy Carolinas | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	32	26
Gross amounts offset	(1)	(6)
Net amounts presented in Current Liabilities: Other	31	20
Duke Energy Carolinas | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	9	9
Gross amounts offset	(9)	(8)
Net amounts presented in Current Liabilities: Other		1
Progress Energy
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	43	24
Net amounts presented in Current Liabilities: Other	43	24
Progress Energy | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	33	19
Gross amounts offset	(1)	(5)
Net amounts presented in Current Liabilities: Other	32	14
Progress Energy | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	10	5
Gross amounts offset	(10)	(5)
Duke Energy Progress
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	11	10
Net amounts presented in Current Liabilities: Other	11	10
Duke Energy Progress | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	5
Gross amounts offset	(1)	(5)
Duke Energy Progress | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	10	5
Gross amounts offset	(10)	(5)
Duke Energy Florida
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	33	14
Net amounts presented in Current Liabilities: Other	33	14
Duke Energy Florida | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	33	14
Net amounts presented in Current Liabilities: Other	33	14
Duke Energy Ohio
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	3	5
Duke Energy Ohio | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	1	1
Net amounts presented in Current Liabilities: Other	1	1
Duke Energy Ohio | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	2	4
Net amounts presented in Current Liabilities: Other	2	4
Duke Energy Indiana
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	21	27
Net amounts presented in Current Liabilities: Other	21	27
Duke Energy Indiana | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	21	13
Gross amounts offset	(17)
Net amounts presented in Current Liabilities: Other	4	13
Duke Energy Indiana | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized		14
Net amounts presented in Current Liabilities: Other		14
Piedmont
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	193	139
Net amounts presented in Current Liabilities: Other	193	139
Piedmont | Current liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	25	21
Net amounts presented in Current Liabilities: Other	25	21
Piedmont | Noncurrent liabilities
Offsetting Derivative Liabilities [Abstract]
Gross amounts recognized	168	118
Net amounts presented in Current Liabilities: Other	$ 168	$ 118