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Related Party Transactions (Other Revenue and Expense) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 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 | $ 191 | $ 243 | $ 397 | $ 446
Duke Energy Carolinas | Indemnification coverages | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 7 | 6 | 14 | 12
Duke Energy Carolinas | JDA | Duke Energy Progress |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 173 | 25 | 267 | 65
Related party transaction, other revenues from transactions with related party | 12 | 13 | 38 | 26
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 | 5 | 15 | 9 | 29
Progress Energy | Corporate governance and shared service expenses | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 184 | 233 | 380 | 414
Progress Energy | Indemnification coverages | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 11 | 11 | 22 | 21
Progress Energy | JDA | Duke Energy Carolinas |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 12 | 13 | 38 | 26
Related party transaction, other revenues from transactions with related party | 173 | 25 | 267 | 65
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 | 18 | 38 | 37
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 | 108 | 141 | 227 | 246
Duke Energy Progress | Indemnification coverages | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 5 | 5 | 10 | 10
Duke Energy Progress | JDA | Duke Energy Carolinas |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 12 | 13 | 38 | 26
Related party transaction, other revenues from transactions with related party | 173 | 25 | 267 | 65
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 | 18 | 38 | 37
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 | 76 | 92 | 153 | 168
Duke Energy Florida | Indemnification coverages | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 6 | 6 | 12 | 11
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 | 164 | 158
Duke Energy Ohio | Indemnification coverages | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 1 | 1 | 2 | 2
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 | 91 | 93 | 215 | 206
Duke Energy Indiana | Indemnification coverages | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 2 | 2 | 4 | 4
Piedmont | Corporate governance and shared service expenses | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 37 | 36 | 72 | 69
Piedmont | Indemnification coverages | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | 2 | 1 | 3 | 2
Piedmont | Intercompany natural gas purchases and sales | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, other revenues from transactions with related party | 24 | 33 | 47 | 66
Piedmont | Natural gas storage and transportation costs | Affiliated Entity |  |  |  |
Related Party Transaction [Line Items] |  |  |  |
Related party transaction, expenses from transactions with related party | $ 5 | $ 5 | $ 11 | $ 11

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