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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, 2023
Jun. 30, 2022
Duke Energy Ohio    
Sales    
Receivables sold $ 1,381 $ 1,247
Loss recognized on sale 17 7
Cash flows    
Cash proceeds from receivables sold 1,445 1,188
Collection fees received 1 1
Return received on retained interests 10 3
Duke Energy Indiana    
Sales    
Receivables sold 1,665 1,617
Loss recognized on sale 19 6
Cash flows    
Cash proceeds from receivables sold 1,793 1,484
Collection fees received 1 1
Return received on retained interests $ 13 $ 4