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Investments in Debt and Equity Securities (Maturities) (Details)
$ in Millions
Mar. 31, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less $ 83
Due after one through five years 921
Due after five through 10 years 610
Due after 10 years 1,914
Total 3,528
Duke Energy Carolinas  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 5
Due after one through five years 441
Due after five through 10 years 286
Due after 10 years 1,079
Total 1,811
Progress Energy  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 75
Due after one through five years 414
Due after five through 10 years 273
Due after 10 years 739
Total 1,501
Duke Energy Progress  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 19
Due after one through five years 334
Due after five through 10 years 258
Due after 10 years 689
Total 1,300
Duke Energy Florida  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 56
Due after one through five years 80
Due after five through 10 years 15
Due after 10 years 50
Total 201
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 7
Due after 10 years 10
Total $ 26