Regulatory Matters (Schedule of Net Carrying Value Of Facilities and Megawatt Capacity) (Details) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022 USD ($) MW	Dec. 31, 2034 asset	Dec. 31, 2021 USD ($)
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	$ 112,316		$ 111,408
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	34,463		34,122
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	23,694		23,657
Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	18,254		18,046
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Public utilities, property, plant and equipment, net	$ 11,801		$ 11,760
Generation facilities to be retired
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	8,386
Public utilities, property, plant and equipment, net	$ 6,094
Generation facilities to be retired | Duke Energy Carolinas | Allen Steam Station Unit 1
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	167
Public utilities, property, plant and equipment, net	$ 12
Generation facilities to be retired | Duke Energy Carolinas | Allen Steam Station Unit 5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	259
Public utilities, property, plant and equipment, net	$ 265
Generation facilities to be retired | Duke Energy Carolinas | Cliffside Unit 5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	546
Public utilities, property, plant and equipment, net	$ 358
Generation facilities to be retired | Duke Energy Progress | Mayo Unit 1
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	713
Public utilities, property, plant and equipment, net	$ 621
Generation facilities to be retired | Duke Energy Progress | Roxboro Units 3-4
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	1,409
Public utilities, property, plant and equipment, net	$ 450
Generation facilities to be retired | Duke Energy Florida | Crystal River Units 4-5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	1,442
Public utilities, property, plant and equipment, net	$ 1,636
Generation facilities to be retired | Duke Energy Florida | Crystal River Units 4 and 5 | Forecast
Public Utilities, General Disclosures [Line Items]
Facilities retiring ahead of schedule | asset		2
Facilities retiring ahead of schedule, years ahead		8 years
Generation facilities to be retired | Duke Energy Indiana | Gibson Units 1-5
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	2,845
Public utilities, property, plant and equipment, net	$ 2,076
Generation facilities to be retired | Duke Energy Indiana | Cayuga Units 1-2
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW	1,005
Public utilities, property, plant and equipment, net	$ 676