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Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled Receivables | $ 788 | $ 843
Duke Energy Carolinas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled Receivables | 284 | 298
Progress Energy |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled Receivables | 274 | 217
Duke Energy Progress |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled Receivables | 139 | 122
Duke Energy Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled Receivables | 135 | 95
Duke Energy Ohio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled Receivables | 1 | 1
Duke Energy Ohio | CRC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled Receivables | 66 | 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 | 106 | 115
Piedmont Natural Gas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled Receivables | $ 5 | $ 78

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