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Investments in Debt and Equity Securities (Maturities) (Details)
$ in Millions
Sep. 30, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less $ 92
Due after one through five years 862
Due after five through 10 years 712
Due after 10 years 1,753
Total 3,419
Duke Energy Carolinas  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 9
Due after one through five years 347
Due after five through 10 years 426
Due after 10 years 925
Total 1,707
Progress Energy  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 68
Due after one through five years 431
Due after five through 10 years 234
Due after 10 years 719
Total 1,452
Duke Energy Progress  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 10
Due after one through five years 326
Due after five through 10 years 220
Due after 10 years 678
Total 1,234
Duke Energy Florida  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 58
Due after one through five years 105
Due after five through 10 years 14
Due after 10 years 41
Total 218
Duke Energy Indiana  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 7
Due after one through five years 20
Due after five through 10 years 13
Due after 10 years 26
Total $ 66