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Variable Interest Entities (Sales and Cash Flows) (Details) - VIE not primary beneficiary - CRC - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Duke Energy Ohio    
Sales    
Receivables sold $ 474 $ 1,381
Loss recognized on sale 7 17
Cash flows    
Cash proceeds from receivables sold 478 1,445
Collection fees received 0 1
Return received on retained interests 4 10
Duke Energy Indiana    
Sales    
Receivables sold 473 1,665
Loss recognized on sale 6 19
Cash flows    
Cash proceeds from receivables sold 523 1,793
Collection fees received 0 1
Return received on retained interests $ 4 $ 13