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Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 843 | $ 896
Duke Energy Carolinas |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 298 | 313
Progress Energy |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 217 | 244
Duke Energy Progress |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 122 | 148
Duke Energy Florida |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 95 | 96
Duke Energy Ohio |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 1 | 2
Duke Energy Ohio | CRC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 82 | 86
Duke Energy Indiana |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 16 | 23
Duke Energy Indiana | CRC |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 115 | 128
Piedmont |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 78 | $ 73

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