Asset Retirement Obligations (Rollforward) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Asset Retirement Obligation [Line Items]
Beginning Balance	$ 12,600	$ 12,854
Accretion expense	501	504
Liabilities settled	(680)	(613)
Liabilities incurred in the current year	22	14
Revisions in estimates of cash flows	285	(159)
Ending Balance	12,728	12,600
Duke Energy Carolinas
Asset Retirement Obligation [Line Items]
Beginning Balance	5,301	5,350
Accretion expense	242	242
Liabilities settled	(234)	(210)
Liabilities incurred in the current year		8
Revisions in estimates of cash flows	73	(89)
Ending Balance	5,382	5,301
Progress Energy
Asset Retirement Obligation [Line Items]
Beginning Balance	6,112	6,149
Accretion expense	229	229
Liabilities settled	(334)	(324)
Liabilities incurred in the current year	18	6
Revisions in estimates of cash flows	156	52
Ending Balance	6,181	6,112
Duke Energy Progress
Asset Retirement Obligation [Line Items]
Beginning Balance	5,675	5,635
Accretion expense	215	212
Liabilities settled	(228)	(214)
Revisions in estimates of cash flows	161	42
Ending Balance	5,823	5,675
Duke Energy Florida
Asset Retirement Obligation [Line Items]
Beginning Balance	437	514
Accretion expense	14	17
Liabilities settled	(106)	(110)
Liabilities incurred in the current year	18	6
Revisions in estimates of cash flows	(5)	10
Ending Balance	358	437
Duke Energy Ohio
Asset Retirement Obligation [Line Items]
Beginning Balance	136	111
Accretion expense	6	4
Liabilities settled	(13)	(3)
Revisions in estimates of cash flows	25	24
Ending Balance	154	136
Duke Energy Indiana
Asset Retirement Obligation [Line Items]
Beginning Balance	987	1,176
Accretion expense	30	35
Liabilities settled	(98)	(77)
Liabilities incurred in the current year	5
Revisions in estimates of cash flows	27	(147)
Ending Balance	951	987
Piedmont
Asset Retirement Obligation [Line Items]
Beginning Balance	22	20
Accretion expense	1	1
Revisions in estimates of cash flows	3	1
Ending Balance	$ 26	$ 22