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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 | Sep. 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 | $ 3,179
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 97
Debt securities, available-for-sale, and equity securities, FV-NI | 7,790
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 | 3,127
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 93
Cash and cash equivalents | 75
Debt securities, available-for-sale, and equity securities, FV-NI | 7,403
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 | 52
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 4
Cash and cash equivalents | 21
Debt securities, available-for-sale, and equity securities, FV-NI | 387
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 | 1,695
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 55
Cash and cash equivalents | 18
Debt securities, available-for-sale, and equity securities, FV-NI | 3,936
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 | 1,433
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 38
Debt securities, available-for-sale, and equity securities, FV-NI | 3,533
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 | 1,432
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 38
Cash and cash equivalents | 57
Debt securities, available-for-sale, and equity securities, FV-NI | 3,467
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 | 18
Debt securities, available-for-sale, and equity securities, FV-NI | 66
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 | 1,106
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 29
Debt securities, available-for-sale, and equity securities, FV-NI | 2,744
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 | 1,106
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 29
Cash and cash equivalents | 42
Debt securities, available-for-sale, and equity securities, FV-NI | 2,736
Duke Energy Progress [Member] | Other Classification [Member] |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |
Cash and cash equivalents | 8
Debt securities, available-for-sale, and equity securities, FV-NI | 8
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 | 327
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 9
Debt securities, available-for-sale, and equity securities, FV-NI | 779
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 | 326
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 9
Cash and cash equivalents | 15
Debt securities, available-for-sale, and equity securities, FV-NI | 731
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
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 | 40
Debt securities, available-for-sale, and equity securities, FV-NI, unrealized loss | 1
Debt securities, available-for-sale, and equity securities, FV-NI | $ 118

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