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Investments in Debt and Equity Securities (Maturities) (Details)
$ in Millions
Sep. 30, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less $ 92
Due after one through five years 1,138
Due after five through 10 years 900
Due after 10 years 2,284
Total 4,414
Duke Energy Carolinas  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 9
Due after one through five years 571
Due after five through 10 years 460
Due after 10 years 1,289
Total 2,329
Progress Energy  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 82
Due after one through five years 507
Due after five through 10 years 394
Due after 10 years 882
Total 1,865
Duke Energy Progress  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 10
Due after one through five years 464
Due after five through 10 years 377
Due after 10 years 834
Total 1,685
Duke Energy Florida  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 72
Due after one through five years 43
Due after five through 10 years 17
Due after 10 years 48
Total 180
Duke Energy Indiana  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 1
Due after one through five years 8
Due after five through 10 years 6
Due after 10 years 13
Total $ 28