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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, 2023
Sep. 30, 2022
Duke Energy Ohio    
Sales    
Receivables sold $ 1,973 $ 1,869
Loss recognized on sale 25 11
Cash flows    
Cash proceeds from receivables sold 2,024 1,757
Collection fees received 1 1
Return received on retained interests 15 6
Duke Energy Indiana    
Sales    
Receivables sold 2,453 2,646
Loss recognized on sale 29 15
Cash flows    
Cash proceeds from receivables sold 2,580 2,465
Collection fees received 1 1
Return received on retained interests $ 19 $ 9