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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
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 | $ 197 | $ 213 | $ 409 | $ 433
Duke Energy Carolinas [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 5 | 5 | 10 | 11
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 | 17 | 19 | 40 | 53
Related party transaction, expenses from transactions with related party | 20 | 19 | 113 | 73
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 | 4 | 7 | 8
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 | 183 | 206 | 359 | 397
Progress Energy [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 10 | 9 | 19 | 17
Progress Energy [Member] | JDA [Member] | Duke Energy Carolinas [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | 20 | 19 | 113 | 73
Related party transaction, expenses from transactions with related party | 17 | 19 | 40 | 53
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 | 19 | 19 | 38 | 38
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 | 108 | 126 | 214 | 244
Duke Energy Progress [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 4 | 3 | 8 | 6
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 | 20 | 19 | 113 | 73
Related party transaction, expenses from transactions with related party | 17 | 19 | 40 | 53
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 | 19 | 19 | 38 | 38
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 | 75 | 80 | 145 | 153
Duke Energy Florida [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 6 | 6 | 11 | 11
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 | 83 | 90 | 168 | 179
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 | 2 | 2
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 | 93 | 96 | 190 | 197
Duke Energy Indiana [Member] | Indemnification coverages [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 1 | 2 | 3 | 4
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 | 37 | 40 | 69 | 76
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
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 | 22 | 23 | 45 | 46
Piedmont Natural Gas [Member] | Natural gas storage and transportation costs [Member] | Affiliated Entity [Member] |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | $ 6 | $ 6 | $ 11 | $ 12

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