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Variable Interest Entities (Receivables Sold) (Details) - CRC - Non-consolidated VIEs - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Duke Energy Ohio |  |
Variable Interest Entity [Line Items] |  |
Receivables sold | $ 270 | $ 253
Less: Retained interests | 83 | 64
Net receivables sold | 187 | 189
Duke Energy Indiana |  |
Variable Interest Entity [Line Items] |  |
Receivables sold | 344 | 307
Less: Retained interests | 110 | 77
Net receivables sold | $ 234 | $ 230

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