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Business Segments (Major Customer Disclosure) (Details) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 6,115 | $ 6,628 | $ 5,643 | $ 6,135 | $ 5,799 | $ 6,482 | $ 5,555 | $ 5,729 | $ 24,521 | $ 23,565 | $ 22,743
Duke Energy Progress [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue, Major Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,366 | $ 1,582 | $ 1,291 | $ 1,460 | $ 1,251 | $ 1,460 | $ 1,199 | $ 1,219 | $ 5,699 | $ 5,129 | $ 5,277
Number of Reportable Segments | segment |  |  |  |  |  |  |  |  | 1 |  |

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- Details
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