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Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 146 | $ 76
Cumulative Change in Accounting Principle | 122 | 146
Write-Offs | (58) | (58)
Credit Loss Expense | 54 | 75
Other Adjustments | (20) | 48
Ending balance | 122 | 146
Duke Energy Carolinas |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 23 | 10
Cumulative Change in Accounting Principle | 42 | 23
Write-Offs | (21) | (13)
Credit Loss Expense | 27 | 13
Other Adjustments | 13 | 12
Ending balance | 42 | 23
Progress Energy |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 37 | 16
Cumulative Change in Accounting Principle | 36 | 37
Write-Offs | (25) | (23)
Credit Loss Expense | 25 | 29
Other Adjustments | (1) | 13
Ending balance | 36 | 37
Duke Energy Progress |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 23 | 8
Cumulative Change in Accounting Principle | 21 | 23
Write-Offs | (12) | (8)
Credit Loss Expense | 11 | 9
Other Adjustments | (1) | 13
Ending balance | 21 | 23
Duke Energy Florida |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 14 | 7
Cumulative Change in Accounting Principle | 16 | 14
Write-Offs | (13) | (14)
Credit Loss Expense | 14 | 20
Other Adjustments | 1 |
Ending balance | 16 | 14
Duke Energy Ohio |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 4 | 4
Cumulative Change in Accounting Principle | 4 | 4
Ending balance | 4 | 4
Duke Energy Indiana |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 3 | 3
Cumulative Change in Accounting Principle | 3 | 3
Ending balance | 3 | 3
Piedmont |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 12 | 6
Cumulative Change in Accounting Principle | 15 | 12
Write-Offs | (9) | (6)
Credit Loss Expense | 7 | 11
Other Adjustments | 5 |
Ending balance | $ 15 | 12
Cumulative Change in Accounting Principle |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance |  | 5
Cumulative Change in Accounting Principle |  |
Cumulative Change in Accounting Principle | Duke Energy Carolinas |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance |  | 1
Cumulative Change in Accounting Principle |  |
Cumulative Change in Accounting Principle | Progress Energy |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance |  | 2
Cumulative Change in Accounting Principle |  |
Cumulative Change in Accounting Principle | Duke Energy Progress |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance |  | 1
Cumulative Change in Accounting Principle |  |
Cumulative Change in Accounting Principle | Duke Energy Florida |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance |  | 1
Cumulative Change in Accounting Principle |  |
Cumulative Change in Accounting Principle | Piedmont |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance |  | $ 1
Cumulative Change in Accounting Principle |  |

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