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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 204 $ 214 $ 205 $ 216
Cumulative Change in Accounting Principle 207 199 207 199
Write-Offs (36) (43) (68) (85)
Credit Loss Expense 35 23 45 39
Other Adjustments 4 5 25 29
Ending balance 207 199 207 199
Duke Energy Carolinas        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 62 70 56 68
Cumulative Change in Accounting Principle 65 57 65 57
Write-Offs (16) (20) (28) (40)
Credit Loss Expense 10 6 17 13
Other Adjustments 9 1 20 16
Ending balance 65 57 65 57
Progress Energy        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 73 75 74 81
Cumulative Change in Accounting Principle 73 73 73 73
Write-Offs (17) (18) (33) (40)
Credit Loss Expense 11 12 20 18
Other Adjustments 6 4 12 14
Ending balance 73 73 73 73
Duke Energy Progress        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 47 45 44 44
Cumulative Change in Accounting Principle 47 43 47 43
Write-Offs (12) (10) (19) (19)
Credit Loss Expense 6 4 10 5
Other Adjustments 6 4 12 13
Ending balance 47 43 47 43
Duke Energy Florida        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 27 30 31 36
Cumulative Change in Accounting Principle 26 30 26 30
Write-Offs (5) (8) (14) (20)
Credit Loss Expense 5 8 10 13
Other Adjustments (1) 0 (1) 1
Ending balance 26 30 26 30
Duke Energy Ohio        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 41 7 9 6
Cumulative Change in Accounting Principle 42 8 42 8
Write-Offs 0 0 0 0
Credit Loss Expense 1 1 2 2
Other Adjustments 0 0 31 0
Ending balance 42 8 42 8
Duke Energy Indiana        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 16 4 5 4
Cumulative Change in Accounting Principle 16 4 16 4
Write-Offs 0 0 0 0
Credit Loss Expense 0 0 2 0
Other Adjustments 0 0 9 0
Ending balance 16 4 16 4
Piedmont        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 12 14 11 14
Cumulative Change in Accounting Principle 11 13 11 13
Write-Offs (3) (5) (4) (6)
Credit Loss Expense 2 4 4 5
Other Adjustments 0 0 0 0
Ending balance $ 11 $ 13 $ 11 $ 13