Regulatory Matters (Schedule of Net Carrying Value Of Facilities) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2034 asset	Dec. 31, 2020 USD ($) MW	Dec. 31, 2019 USD ($)
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 106,782	$ 102,127
Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		9,391
Remaining net book value		$ 6,402
Duke Energy Carolinas
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 33,187	32,397
Duke Energy Carolinas | Allen Steam Station Units 1-3 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		604
Remaining net book value		$ 113
Duke Energy Carolinas | Allen Steam Station Units 4-5 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		526
Remaining net book value		$ 338
Duke Energy Carolinas | Cliffside Unit 5 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		546
Remaining net book value		$ 350
Duke Energy Carolinas | Allen Steam Station 3 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		270
Remaining net book value		$ 26
Duke Energy Progress
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 22,987	22,934
Duke Energy Progress | Mayo Unit 1 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		746
Remaining net book value		$ 676
Duke Energy Progress | Roxboro Units 3-4 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		1,409
Remaining net book value		$ 484
Duke Energy Florida
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 16,563	15,221
Duke Energy Florida | Crystal River Units 4 and 5 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		1,430
Remaining net book value		$ 1,696
Duke Energy Florida | Crystal River Units 4 and 5 | Generating facilities planned for retirement | Forecast
Public Utilities, General Disclosures [Line Items]
Facilities retiring ahead of schedule | asset	2
Facilities retiring ahead of schedule, years ahead	8 years
Duke Energy Indiana
Public Utilities, General Disclosures [Line Items]
Remaining net book value		$ 11,721	$ 11,072
Duke Energy Indiana | Gallagher Units 2 and 4 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		280
Remaining net book value		$ 102
Duke Energy Indiana | Gibson Units 1 - 5 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		2,845
Remaining net book value		$ 1,866
Duke Energy Indiana | Cayuga Units 1 - 2 | Generating facilities planned for retirement
Public Utilities, General Disclosures [Line Items]
Capacity (in MW) | MW		1,005
Remaining net book value		$ 777