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Variable Interest Entities (Sales and Cash Flows) (Details) - Non-consolidated VIEs - CRC - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Duke Energy Ohio |  |  |
Variable Interest Entity [Line Items] |  |  |
Receivables sold | $ 2,578 | $ 2,562 | $ 2,023
Loss recognized on sale | 34 | 18 | 10
Cash proceeds from receivables sold | 2,591 | 2,424 | 2,018
Collection fees received | 1 | 1 | 1
Return received on retained interests | 19 | 10 | 4
Duke Energy Indiana |  |  |
Variable Interest Entity [Line Items] |  |  |
Receivables sold | 3,223 | 3,744 | 2,909
Loss recognized on sale | 39 | 26 | 13
Cash proceeds from receivables sold | 3,294 | 3,498 | 2,909
Collection fees received | 2 | 2 | 1
Return received on retained interests | $ 25 | $ 15 | $ 6

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