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Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | $ 140 | $ 147 | $ 122 | $ 146
Cumulative Change in Accounting Principle | 136 | 123 | 136 | 123
Write-Offs | (31) | (5) | (54) | (26)
Credit Loss Expense | 20 | 12 | 44 | 29
Other Adjustments | 7 | (31) | 24 | (26)
Ending balance | 136 | 123 | 136 | 123
Duke Energy Carolinas |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 52 | 34 | 42 | 23
Cumulative Change in Accounting Principle | 52 | 42 | 52 | 42
Write-Offs | (16) | 1 | (25) | (7)
Credit Loss Expense | 8 | 6 | 13 | 16
Other Adjustments | 8 | 1 | 22 | 10
Ending balance | 52 | 42 | 52 | 42
Progress Energy |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 51 | 37 | 36 | 37
Cumulative Change in Accounting Principle | 52 | 36 | 52 | 36
Write-Offs | (9) | (4) | (19) | (14)
Credit Loss Expense | 7 | 6 | 19 | 13
Other Adjustments | 3 | (3) | 16 |
Ending balance | 52 | 36 | 52 | 36
Duke Energy Progress |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 31 | 23 | 21 | 23
Cumulative Change in Accounting Principle | 31 | 21 | 31 | 21
Write-Offs | (5) | (3) | (7) | (8)
Credit Loss Expense | 2 | 4 | 6 | 6
Other Adjustments | 3 | (3) | 11 |
Ending balance | 31 | 21 | 31 | 21
Duke Energy Florida |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 21 | 15 | 16 | 14
Cumulative Change in Accounting Principle | 21 | 16 | 21 | 16
Write-Offs | (5) | (1) | (13) | (6)
Credit Loss Expense | 5 | 2 | 13 | 7
Other Adjustments |  |  | 5 | 1
Ending balance | 21 | 16 | 21 | 16
Duke Energy Ohio |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 4 | 4 | 4 | 4
Cumulative Change in Accounting Principle | 4 | 4 | 4 | 4
Ending balance | 4 | 4 | 4 | 4
Duke Energy Indiana |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 3 | 3 | 3 | 3
Cumulative Change in Accounting Principle | 3 | 3 | 3 | 3
Ending balance | 3 | 3 | 3 | 3
Piedmont |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |
Beginning balance | 17 | 14 | 15 | 12
Cumulative Change in Accounting Principle | 15 | 13 | 15 | 13
Write-Offs | (5) | (2) | (6) | (3)
Credit Loss Expense | 3 | 1 | 6 | 4
Ending balance | $ 15 | $ 13 | $ 15 | $ 13

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