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Variable Interest Entities (Sales and Cash Flows) (Details) - VIE not primary beneficiary - CRC - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Duke Energy Ohio    
Sales    
Receivables sold $ 474 $ 1,973
Loss recognized on sale 7 25
Cash flows    
Cash proceeds from receivables sold 478 2,024
Collection fees received 0 1
Return received on retained interests 4 15
Duke Energy Indiana    
Sales    
Receivables sold 473 2,646
Loss recognized on sale 6 15
Cash flows    
Cash proceeds from receivables sold 523 2,465
Collection fees received 0 1
Return received on retained interests $ 4 $ 9