v3.25.2
Investments in Debt and Equity Securities (Maturities) (Details)
$ in Millions
Jun. 30, 2025
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less $ 87
Due after one through five years 896
Due after five through 10 years 695
Due after 10 years 1,887
Total 3,565
Duke Energy Carolinas  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 5
Due after one through five years 397
Due after five through 10 years 360
Due after 10 years 1,074
Total 1,836
Progress Energy  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 79
Due after one through five years 438
Due after five through 10 years 285
Due after 10 years 712
Total 1,514
Duke Energy Progress  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 17
Due after one through five years 375
Due after five through 10 years 268
Due after 10 years 664
Total 1,324
Duke Energy Florida  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 62
Due after one through five years 63
Due after five through 10 years 17
Due after 10 years 48
Total 190
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 11
Total $ 26