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Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Variable Interest Entities [Line Items] |  |
Long-Term Debt | $ 53,681 | $ 51,123
Duke Energy Carolinas [Member] |  |
Variable Interest Entities [Line Items] |  |
Long-Term Debt | 10,658 | 10,633
Duke Energy Progress [Member] |  |
Variable Interest Entities [Line Items] |  |
Long-Term Debt | 8,893 | 7,451
Duke Energy Florida [Member] |  |
Variable Interest Entities [Line Items] |  |
Long-Term Debt | $ 6,795 | 7,051
Cinergy Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Line of credit facility, expiration date | Dec. 01, 2020 |
Facility size | $ 350 |
Long-Term Debt | 350 | 325
Accounts receivable from securitization | $ 534 | 564
DERF [Member] | Duke Energy Carolinas [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Line of credit facility, expiration date | Dec. 01, 2020 |
Facility size | $ 475 |
Long-Term Debt | 475 | 450
Accounts receivable from securitization | $ 630 | 699
DEPR [Member] | Duke Energy Progress [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Line of credit facility, expiration date | Feb. 01, 2021 |
Facility size | $ 325 |
Long-Term Debt | 325 | 300
Accounts receivable from securitization | $ 495 | 547
DEFR [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entities [Line Items] |  |
Line of credit facility, expiration date | Apr. 01, 2021 |
Facility size | $ 250 |
Long-Term Debt | 250 | 225
Accounts receivable from securitization | $ 317 | $ 357

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