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Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($) | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Variable Interest Entities [Line Items] |  |
Long-Term Debt | $ 56,049,000,000 | $ 54,985,000,000
Duke Energy Carolinas |  |
Variable Interest Entities [Line Items] |  |
Long-Term Debt | 11,497,000,000 | 11,142,000,000
Duke Energy Progress |  |
Variable Interest Entities [Line Items] |  |
Long-Term Debt | 8,605,000,000 | 7,902,000,000
Duke Energy Florida |  |
Variable Interest Entities [Line Items] |  |
Long-Term Debt | 7,294,000,000 | 7,416,000,000
CRC | VIE primary beneficiary |  |
Variable Interest Entities [Line Items] |  |
Facility size | 350,000,000 |
Long-Term Debt | 350,000,000 | 350,000,000
Accounts receivable from securitization | 479,000,000 | 522,000,000
DERF | Duke Energy Carolinas | VIE primary beneficiary |  |
Variable Interest Entities [Line Items] |  |
Facility size | 475,000,000 |
Long-Term Debt | 475,000,000 | 474,000,000
Accounts receivable from securitization | 770,000,000 | 642,000,000
DEPR | Duke Energy Progress | VIE primary beneficiary |  |
Variable Interest Entities [Line Items] |  |
Facility size | 350,000,000 |
Long-Term Debt | 350,000,000 | 325,000,000
Accounts receivable from securitization | 559,000,000 | 489,000,000
DEFR | Duke Energy Florida | VIE primary beneficiary |  |
Variable Interest Entities [Line Items] |  |
Facility size | 250,000,000 |
Long-Term Debt | 250,000,000 | 250,000,000
Accounts receivable from securitization | $ 506,000,000 | $ 336,000,000

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