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Investments in Debt and Equity Securities (All Debt and Equity Securities Through OCI and FV-NI - ASU 2016-01) (Details) $ in Millions | Jun. 30, 2018 USD ($)
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Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | $ 2,898
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 83
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 7,500
Ndtf [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 2,851
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 79
Cash and cash equivalents | 116
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 7,124
Other Classification [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 47
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 4
Cash and cash equivalents | 15
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 376
Duke Energy Carolinas [Member] | Ndtf [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,549
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 47
Cash and cash equivalents | 32
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3,781
Progress Energy [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,303
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 32
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3,401
Progress Energy [Member] | Ndtf [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,302
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 32
Cash and cash equivalents | 84
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3,343
Progress Energy [Member] | Other Classification [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1
Cash and cash equivalents | 11
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 58
Duke Energy Progress [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,002
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 25
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 2,628
Duke Energy Progress [Member] | Ndtf [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,002
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 25
Cash and cash equivalents | 46
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 2,627
Duke Energy Progress [Member] | Other Classification [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Cash and cash equivalents | 1
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 1
Duke Energy Florida [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 301
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 7
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 764
Duke Energy Florida [Member] | Ndtf [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 300
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 7
Cash and cash equivalents | 38
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 716
Duke Energy Florida [Member] | Other Classification [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1
Cash and cash equivalents | 1
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 48
Duke Energy Indiana [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 36
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 1
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | $ 115

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