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Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Long-Term Debt | $ 55,625 | $ 54,985
Duke Energy Carolinas |  |
Variable Interest Entity [Line Items] |  |
Long-Term Debt | 11,412 | 11,142
Duke Energy Progress |  |
Variable Interest Entity [Line Items] |  |
Long-Term Debt | 8,505 | 7,902
Duke Energy Florida |  |
Variable Interest Entity [Line Items] |  |
Long-Term Debt | 7,092 | 7,416
CRC | Consolidated VIEs |  |
Variable Interest Entity [Line Items] |  |
Facility size | 350 |
Long-Term Debt | 350 | 350
Restricted Receivables | 547 | 522
DERF | Duke Energy Carolinas | Consolidated VIEs |  |
Variable Interest Entity [Line Items] |  |
Facility size | 475 |
Long-Term Debt | 364 | 474
Restricted Receivables | 696 | 642
DEPR | Duke Energy Progress | Consolidated VIEs |  |
Variable Interest Entity [Line Items] |  |
Facility size | 350 |
Long-Term Debt | 250 | 325
Restricted Receivables | 500 | 489
DEFR | Duke Energy Florida | Consolidated VIEs |  |
Variable Interest Entity [Line Items] |  |
Facility size | 250 |
Long-Term Debt | 250 | 250
Restricted Receivables | $ 397 | $ 336

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