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Variable Interest Entities (Schedule of Accounts Receivable Securitizations) (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |
Long-Term debt | $ 51,123 | $ 49,035
Duke Energy Carolinas [Member] |  |
Variable Interest Entity [Line Items] |  |
Long-Term debt | 10,633 | 8,598
Duke Energy Progress [Member] |  |
Variable Interest Entity [Line Items] |  |
Long-Term debt | 7,451 | 7,204
Duke Energy Florida [Member] |  |
Variable Interest Entity [Line Items] |  |
Long-Term debt | $ 7,051 | 6,327
Cinergy Receivables [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Line of credit facility, expiration date | Dec. 01, 2020 |
Facility Size | $ 325 |
Long-Term debt | 325 | 325
Restricted Receivables | $ 564 | 545
DERF [Member] | Duke Energy Carolinas [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Line of credit facility, expiration date | Dec. 01, 2020 |
Facility Size | $ 450 |
Long-Term debt | 450 | 450
Restricted Receivables | $ 699 | 640
DEPR [Member] | Duke Energy Progress [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Line of credit facility, expiration date | Feb. 01, 2021 |
Facility Size | $ 300 |
Long-Term debt | 300 | 300
Restricted Receivables | $ 547 | 459
DEFR [Member] | Duke Energy Florida [Member] | Variable Interest Entity, Primary Beneficiary [Member] |  |
Variable Interest Entity [Line Items] |  |
Line of credit facility, expiration date | Apr. 01, 2021 |
Facility Size | $ 225 |
Long-Term debt | 225 | 225
Restricted Receivables | $ 357 | $ 317

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