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Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 802 | $ 944
Duke Energy Carolinas [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 278 | 342
Progress Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 283 | 228
Duke Energy Progress [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 163 | 143
Duke Energy Florida [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 120 | 85
Duke Energy Ohio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 2 | 4
Duke Energy Indiana [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 25 | 21
Piedmont Natural Gas [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 3 | 86
Cinergy Receivables [Member] | Duke Energy Ohio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 68 | 104
Cinergy Receivables [Member] | Duke Energy Indiana [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 121 | $ 132

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