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Revenue (Reserve for Credit Losses for Trade and Other Receivables) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2020 USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | $ 76
Cumulative Change in Accounting Principle | 146
Write-Offs | 58
Credit Loss Expense | 75
Other Adjustments | 48
Balance at December 31, 2020 | 146
Duke Energy Carolinas |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 10
Cumulative Change in Accounting Principle | 23
Write-Offs | 13
Credit Loss Expense | 13
Other Adjustments | 12
Balance at December 31, 2020 | 23
Progress Energy |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 16
Cumulative Change in Accounting Principle | 37
Write-Offs | 23
Credit Loss Expense | 29
Other Adjustments | 13
Balance at December 31, 2020 | 37
Duke Energy Progress |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 8
Cumulative Change in Accounting Principle | 23
Write-Offs | 8
Credit Loss Expense | 9
Other Adjustments | 13
Balance at December 31, 2020 | 23
Duke Energy Florida |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 7
Cumulative Change in Accounting Principle | 14
Write-Offs | 14
Credit Loss Expense | 20
Balance at December 31, 2020 | 14
Duke Energy Ohio |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 4
Cumulative Change in Accounting Principle | 4
Balance at December 31, 2020 | 4
Duke Energy Indiana |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 3
Cumulative Change in Accounting Principle | 3
Balance at December 31, 2020 | 3
Piedmont |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 6
Cumulative Change in Accounting Principle | 12
Write-Offs | 6
Credit Loss Expense | 11
Balance at December 31, 2020 | 12
Cumulative Change in Accounting Principle |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 5
Cumulative Change in Accounting Principle | 5
Cumulative Change in Accounting Principle | Duke Energy Carolinas |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 1
Cumulative Change in Accounting Principle | 1
Cumulative Change in Accounting Principle | Progress Energy |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 2
Cumulative Change in Accounting Principle | 2
Cumulative Change in Accounting Principle | Duke Energy Progress |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 1
Cumulative Change in Accounting Principle | 1
Cumulative Change in Accounting Principle | Duke Energy Florida |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 1
Cumulative Change in Accounting Principle | 1
Cumulative Change in Accounting Principle | Piedmont |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |
Balance at December 31, 2019 | 1
Cumulative Change in Accounting Principle | $ 1

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