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Variable Interest Entities (Sales and Cash Flows) (Details) - VIE not primary beneficiary - CRC - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Duke Energy Ohio        
Sales        
Receivables sold $ 486 $ 462 $ 1,490 $ 1,428
Loss recognized on sale 2 2 7 8
Cash flows        
Cash proceeds from receivables sold 490 449 1,519 1,439
Collection fees received   1 1 1
Return received on retained interests 1 1 3 3
Duke Energy Indiana        
Sales        
Receivables sold 794 717 2,176 1,947
Loss recognized on sale 4 3 10 9
Cash flows        
Cash proceeds from receivables sold 798 689 2,199 1,941
Collection fees received     1 1
Return received on retained interests $ 1 $ 1 $ 4 $ 4