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Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | $ 122 | $ 146
Cumulative Change in Accounting Principle | 140 | 147
Write-Offs | (23) | (21)
Credit Loss Expense | 24 | 17
Other Adjustments | 17 | 5
Ending balance | 140 | 147
Duke Energy Carolinas |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 42 | 23
Cumulative Change in Accounting Principle | 52 | 34
Write-Offs | (9) | (8)
Credit Loss Expense | 5 | 10
Other Adjustments | 14 | 9
Ending balance | 52 | 34
Progress Energy |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 36 | 37
Cumulative Change in Accounting Principle | 51 | 37
Write-Offs | (10) | (10)
Credit Loss Expense | 12 | 7
Other Adjustments | 13 | 3
Ending balance | 51 | 37
Duke Energy Progress |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 21 | 23
Cumulative Change in Accounting Principle | 31 | 23
Write-Offs | (2) | (5)
Credit Loss Expense | 4 | 2
Other Adjustments | 8 | 3
Ending balance | 31 | 23
Duke Energy Florida |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |
Beginning balance | 16 | 14
Cumulative Change in Accounting Principle | 21 | 15
Write-Offs | (8) | (5)
Credit Loss Expense | 8 | 5
Other Adjustments | 5 | 1
Ending balance | 21 | 15
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 | 15 | 12
Cumulative Change in Accounting Principle | 17 | 14
Write-Offs | (1) | (1)
Credit Loss Expense | 3 | 3
Ending balance | $ 17 | $ 14

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