Organization and Basis of Presentation (Schedule of Inventory) (Details) - USD ($) $ in Millions	Jun. 30, 2022	Dec. 31, 2021
Public Utilities, Inventory [Line Items]
Inventory	$ 3,208	$ 3,199
Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	2,490	2,397
Coal
Public Utilities, Inventory [Line Items]
Inventory	446	486
Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	272	316
Duke Energy Carolinas
Public Utilities, Inventory [Line Items]
Inventory	1,033	1,026
Duke Energy Carolinas | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	817	793
Duke Energy Carolinas | Coal
Public Utilities, Inventory [Line Items]
Inventory	182	195
Duke Energy Carolinas | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	34	38
Progress Energy
Public Utilities, Inventory [Line Items]
Inventory	1,426	1,398
Progress Energy | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	1,124	1,067
Progress Energy | Coal
Public Utilities, Inventory [Line Items]
Inventory	132	167
Progress Energy | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	170	164
Duke Energy Progress
Public Utilities, Inventory [Line Items]
Inventory	948	921
Duke Energy Progress | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	769	729
Duke Energy Progress | Coal
Public Utilities, Inventory [Line Items]
Inventory	79	94
Duke Energy Progress | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	100	98
Duke Energy Florida
Public Utilities, Inventory [Line Items]
Inventory	478	477
Duke Energy Florida | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	355	338
Duke Energy Florida | Coal
Public Utilities, Inventory [Line Items]
Inventory	53	73
Duke Energy Florida | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	70	66
Duke Energy Ohio
Public Utilities, Inventory [Line Items]
Inventory	112	116
Duke Energy Ohio | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	88	80
Duke Energy Ohio | Coal
Public Utilities, Inventory [Line Items]
Inventory	14	19
Duke Energy Ohio | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	10	17
Duke Energy Indiana
Public Utilities, Inventory [Line Items]
Inventory	441	418
Duke Energy Indiana | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	321	311
Duke Energy Indiana | Coal
Public Utilities, Inventory [Line Items]
Inventory	117	105
Duke Energy Indiana | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	3	2
Piedmont
Public Utilities, Inventory [Line Items]
Inventory	68	109
Piedmont | Materials and supplies
Public Utilities, Inventory [Line Items]
Inventory	13	14
Piedmont | Natural gas, oil and other fuel
Public Utilities, Inventory [Line Items]
Inventory	$ 55	$ 95