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v3.19.1

Revenue (Unbilled Revenues) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 733 | $ 896
Duke Energy Carolinas [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 281 | 313
Progress Energy [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 193 | 244
Duke Energy Progress [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 108 | 148
Duke Energy Florida [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 85 | 96
Duke Energy Ohio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 1 | 2
Duke Energy Indiana [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 18 | 23
Piedmont Natural Gas [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 38 | 73
Cinergy Receivables [Member] | Duke Energy Ohio [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | 62 | 86
Cinergy Receivables [Member] | Duke Energy Indiana [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Unbilled receivables | $ 109 | $ 128

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