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Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 969 | $ 843
Duke Energy Carolinas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 328 | 298
Progress Energy |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 283 | 217
Duke Energy Progress |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 167 | 122
Duke Energy Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 116 | 95
Duke Energy Ohio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 2 | 1
Duke Energy Ohio | CRC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 87 | 82
Duke Energy Indiana |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 16 | 16
Duke Energy Indiana | CRC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 134 | 115
Piedmont |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 86 | $ 78

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