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Investments in Debt and Equity Securities (Maturities) (Details)
$ in Millions
Dec. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less $ 108
Due after one through five years 1,130
Due after five through 10 years 955
Due after 10 years 2,246
Total 4,439
Duke Energy Carolinas  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 15
Due after one through five years 564
Due after five through 10 years 513
Due after 10 years 1,257
Total 2,349
Progress Energy  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 92
Due after one through five years 501
Due after five through 10 years 395
Due after 10 years 880
Total 1,868
Duke Energy Progress  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 17
Due after one through five years 473
Due after five through 10 years 378
Due after 10 years 830
Total 1,698
Duke Energy Florida  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 75
Due after one through five years 28
Due after five through 10 years 17
Due after 10 years 50
Total 170
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 14
Total $ 29