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Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 896 | $ 944
Duke Energy Carolinas [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 313 | 342
Progress Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 244 | 228
Duke Energy Progress [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 148 | 143
Duke Energy Florida [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 96 | 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 | 23 | 21
Piedmont Natural Gas [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 73 | 86
Cinergy Receivables [Member] | Duke Energy Ohio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables |  | 104
Cinergy Receivables [Member] | Duke Energy Indiana [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables |  | $ 132
Cinergy Receivables [Member] | Duke Energy Ohio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 86 |
Cinergy Receivables [Member] | Duke Energy Indiana [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 128 |

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