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Investments in Debt and Equity Securities (Maturities) (Details)
$ in Millions
Jun. 30, 2024
USD ($)
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less $ 115
Due after one through five years 785
Due after five through 10 years 664
Due after 10 years 1,638
Total 3,202
Duke Energy Carolinas  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 11
Due after one through five years 297
Due after five through 10 years 411
Due after 10 years 865
Total 1,584
Progress Energy  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 81
Due after one through five years 403
Due after five through 10 years 209
Due after 10 years 679
Total 1,372
Duke Energy Progress  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 18
Due after one through five years 289
Due after five through 10 years 197
Due after 10 years 639
Total 1,143
Duke Energy Florida  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 63
Due after one through five years 114
Due after five through 10 years 12
Due after 10 years 40
Total 229
Duke Energy Indiana  
Debt Securities, Available-for-sale [Line Items]  
Due in one year or less 8
Due after one through five years 21
Due after five through 10 years 9
Due after 10 years 24
Total $ 62