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Investments in Debt and Equity Securities (All Debt and Equity Securities Through OCI and FV-NI - ASU 2016-01) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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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 | $ 3,022 | $ 2,458
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 76 | 131
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 7,785 | 7,075
Debt securities, available-for-sale | 2,447 |
Ndtf [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 2,923 | 2,402
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 2,971 | 2,421
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 74 | 126
Cash and cash equivalents | 114 | 88
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 7,363 | 6,706
Equity Securities, FV-NI, Accumulated Unrealized Loss | 65 | 95
Equity securities, FV-NI | 5,061 | 4,475
Debt securities, available-for-sale | 2,302 | 2,231
Other Classification [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 47 | 36
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 51 | 37
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 2 | 5
Cash and cash equivalents | 51 | 22
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 422 | 369
Equity Securities, FV-NI, Accumulated Unrealized Loss |  | 1
Equity securities, FV-NI | 112 | 99
Debt securities, available-for-sale | 310 | 270
Duke Energy Carolinas [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Debt securities, available-for-sale | 1,065 |
Duke Energy Carolinas [Member] | Ndtf [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 1,593 | 1,309
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,615 | 1,316
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 43 | 74
Cash and cash equivalents | 57 | 29
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3,913 | 3,553
Equity Securities, FV-NI, Accumulated Unrealized Loss | 37 | 54
Equity securities, FV-NI | 2,791 | 2,484
Debt securities, available-for-sale | 1,122 | 1,069
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 | 1,358 | 1,105
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 31 | 52
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3,546 | 3,217
Debt securities, available-for-sale | 1,172 |
Progress Energy [Member] | Ndtf [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 1,330 | 1,093
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,356 | 1,105
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 31 | 52
Cash and cash equivalents | 57 | 59
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3,450 | 3,153
Equity Securities, FV-NI, Accumulated Unrealized Loss | 28 | 41
Equity securities, FV-NI | 2,270 | 1,991
Debt securities, available-for-sale | 1,180 | 1,162
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 | 2 | 0
Cash and cash equivalents | 47 | 17
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 96 | 64
Debt securities, available-for-sale | 96 | 64
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 | 1,042 | 842
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 22 | 39
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 2,741 | 2,500
Debt securities, available-for-sale | 883 |
Duke Energy Progress [Member] | Ndtf [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 1,022 | 833
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,042 | 842
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 22 | 39
Cash and cash equivalents | 43 | 46
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 2,738 | 2,494
Equity Securities, FV-NI, Accumulated Unrealized Loss | 20 | 30
Equity securities, FV-NI | 1,812 | 1,588
Debt securities, available-for-sale | 926 | 906
Duke Energy Progress [Member] | Other Classification [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Cash and cash equivalents | 3 | 6
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3 | 6
Debt securities, available-for-sale | 3 | 6
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 | 316 | 263
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 9 | 13
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 762 | 707
Debt securities, available-for-sale | 289 |
Duke Energy Florida [Member] | Ndtf [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 308 | 260
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 314 | 263
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 9 | 13
Cash and cash equivalents | 14 | 13
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 712 | 659
Equity Securities, FV-NI, Accumulated Unrealized Loss | 8 | 11
Equity securities, FV-NI | 458 | 403
Debt securities, available-for-sale | 254 | 256
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 | 2 |
Cash and cash equivalents | 1 | 1
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 50 | 48
Debt securities, available-for-sale | 50 | 48
Duke Energy Indiana [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 37 | 29
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 37 | 29
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 1 | 1
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 118 | 108
Equity securities, FV-NI | 76 | 67
Debt securities, available-for-sale | 42 |
Duke Energy Indiana [Member] | Other Classification [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity securities, FV-NI | $ 76 | $ 67

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