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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 | Jun. 30, 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 | $ 3,209 | $ 2,458
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 40 | 131
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 8,030 | 7,075
Debt securities, available-for-sale | 2,577 |
Ndtf [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 3,076 | 2,402
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 3,153 | 2,421
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 39 | 126
Cash and cash equivalents | 114 | 88
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 7,603 | 6,706
Equity Securities, FV-NI, Accumulated Unrealized Loss | 36 | 95
Equity securities, FV-NI | 5,178 | 4,475
Debt securities, available-for-sale | 2,425 | 2,231
Other Classification [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 49 | 36
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 56 | 37
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 1 | 5
Cash and cash equivalents | 49 | 22
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 427 | 369
Equity Securities, FV-NI, Accumulated Unrealized Loss |  | 1
Equity securities, FV-NI | 112 | 99
Debt securities, available-for-sale | 315 | 270
Duke Energy Carolinas [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Debt securities, available-for-sale | 1,120 |
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 | 1,671 | 1,309
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,711 | 1,316
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 12 | 74
Cash and cash equivalents | 41 | 29
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 4,044 | 3,553
Equity Securities, FV-NI, Accumulated Unrealized Loss | 9 | 54
Equity securities, FV-NI | 2,883 | 2,484
Debt securities, available-for-sale | 1,161 | 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 | 1,445 | 1,105
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 27 | 52
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3,656 | 3,217
Debt securities, available-for-sale | 1,241 |
Progress Energy [Member] | Ndtf [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Equity Securities, FV-NI, Accumulated Unrealized Gain | 1,405 | 1,093
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,442 | 1,105
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 27 | 52
Cash and cash equivalents | 73 | 59
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 3,559 | 3,153
Equity Securities, FV-NI, Accumulated Unrealized Loss | 27 | 41
Equity securities, FV-NI | 2,295 | 1,991
Debt securities, available-for-sale | 1,264 | 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 | 3 |
Cash and cash equivalents | 47 | 17
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 97 | 64
Debt securities, available-for-sale | 97 | 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 | 1,128 | 842
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 24 | 39
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 2,836 | 2,500
Debt securities, available-for-sale | 906 |
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 | 1,092 | 833
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Gain | 1,128 | 842
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 24 | 39
Cash and cash equivalents | 42 | 46
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 2,834 | 2,494
Equity Securities, FV-NI, Accumulated Unrealized Loss | 24 | 30
Equity securities, FV-NI | 1,886 | 1,588
Debt securities, available-for-sale | 948 | 906
Duke Energy Progress [Member] | Other Classification [Member] |  |
Schedule Of Available For Sale Securities And Other Trading Assets [Line Items] |  |
Cash and cash equivalents | 2 | 6
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 2 | 6
Debt securities, available-for-sale | 2 | 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 | 317 | 263
Debt Securities, Available-for-sale, and Equity Securities, FV-NI, Unrealized Loss | 3 | 13
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 777 | 707
Debt securities, available-for-sale | 335 |
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 | 313 | 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 | 3 | 13
Cash and cash equivalents | 31 | 13
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 725 | 659
Equity Securities, FV-NI, Accumulated Unrealized Loss | 3 | 11
Equity securities, FV-NI | 409 | 403
Debt securities, available-for-sale | 316 | 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 | 3 |
Cash and cash equivalents | 2 | 1
Debt Securities, Available-for-sale, and Equity Securities, FV-NI | 52 | 48
Debt securities, available-for-sale | 52 | 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 | 116 | 108
Equity securities, FV-NI | 74 | 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 | $ 74 | $ 67

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