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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Duke Energy Carolinas [Member] | Corporate governance and shared service expenses [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | $ 214 | $ 206 | $ 647 | $ 645
Duke Energy Carolinas [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 6 | 5 | 17 | 17
Duke Energy Carolinas [Member] | JDA [Member] | Duke Energy Progress [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | 13 | 9 | 66 | 42
Related party transaction, expenses from transactions with related party | 61 | 39 | 134 | 91
Duke Energy Carolinas [Member] | Intercompany natural gas transactions [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 3 | 3 | 11 | 5
Progress Energy [Member] | Corporate governance and shared service expenses [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 216 | 207 | 613 | 555
Progress Energy [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 8 | 10 | 25 | 29
Progress Energy [Member] | JDA [Member] | Duke Energy Carolinas [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | 61 | 39 | 134 | 91
Related party transaction, expenses from transactions with related party | 13 | 9 | 66 | 42
Progress Energy [Member] | Intercompany natural gas transactions [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 20 | 19 | 58 | 57
Duke Energy Progress [Member] | Corporate governance and shared service expenses [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 138 | 112 | 382 | 321
Duke Energy Progress [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 3 | 4 | 9 | 11
Duke Energy Progress [Member] | JDA [Member] | Duke Energy Carolinas [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | 61 | 39 | 134 | 91
Related party transaction, expenses from transactions with related party | 13 | 9 | 66 | 42
Duke Energy Progress [Member] | Intercompany natural gas transactions [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 20 | 19 | 58 | 57
Duke Energy Florida [Member] | Corporate governance and shared service expenses [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 78 | 95 | 231 | 234
Duke Energy Florida [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 5 | 6 | 16 | 18
Duke Energy Ohio [Member] | Corporate governance and shared service expenses [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 85 | 90 | 264 | 275
Duke Energy Ohio [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 1 | 1 | 3 | 3
Duke Energy Indiana [Member] | Corporate governance and shared service expenses [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 105 | 94 | 302 | 281
Duke Energy Indiana [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 2 | 2 | 6 | 6
Piedmont Natural Gas [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party |  |  |  | 62
Piedmont Natural Gas [Member] | Corporate governance and shared service expenses [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 39 | 11 | 115 | 25
Piedmont Natural Gas [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 1 | 1 | 2 | $ 2
Piedmont Natural Gas [Member] | Intercompany natural gas transactions [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | $ 23 | $ 22 | $ 69 |

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