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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