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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Duke Energy Carolinas | Corporate governance and shared service expenses | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | $ 206 | $ 203
Duke Energy Carolinas | Indemnification coverages | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 7 | 6
Duke Energy Carolinas | JDA | Duke Energy Progress |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 94 | 40
Related party transaction, other revenues from transactions with related party | 26 | 13
Duke Energy Carolinas | Intercompany natural gas purchases and sales | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 13 | 14
Progress Energy | Corporate governance and shared service expenses | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 196 | 181
Progress Energy | Indemnification coverages | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 11 | 10
Progress Energy | JDA | Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 26 | 13
Related party transaction, other revenues from transactions with related party | 94 | 40
Progress Energy | Intercompany natural gas purchases and sales | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 19 | 19
Duke Energy Progress | Corporate governance and shared service expenses | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 119 | 105
Duke Energy Progress | Indemnification coverages | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 5 | 5
Duke Energy Progress | JDA | Duke Energy Carolinas |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 26 | 13
Related party transaction, other revenues from transactions with related party | 94 | 40
Duke Energy Progress | Intercompany natural gas purchases and sales | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 19 | 19
Duke Energy Florida | Corporate governance and shared service expenses | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 77 | 76
Duke Energy Florida | Indemnification coverages | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 6 | 5
Duke Energy Ohio | Corporate governance and shared service expenses | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 82 | 79
Duke Energy Ohio | Indemnification coverages | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 1 | 1
Duke Energy Indiana | Corporate governance and shared service expenses | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 124 | 113
Duke Energy Indiana | Indemnification coverages | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 2 | 2
Piedmont | Corporate governance and shared service expenses | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 35 | 33
Piedmont | Indemnification coverages | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | 1 | 1
Piedmont | Intercompany natural gas purchases and sales | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, other revenues from transactions with related party | 32 | 33
Piedmont | Natural gas storage and transportation costs | Affiliated Entity |  |
Related Party Transaction [Line Items] |  |
Related party transaction, expenses from transactions with related party | $ 6 | $ 6

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