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Fair Value Measurements (Reconciliation of Assets and Liabilities Measured At Fair Value On A Recurring Basis Using Unobservable Inputs) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Derivatives (net)        
Balance at beginning of period $ 6 $ 12 $ 15 $ 34
Purchases, sales, issuances and settlements:        
Purchases 29 47 29 47
Settlements (10) (38) (23) (58)
Total gains included on the Condensed Consolidated Balance Sheet 10 20 14 18
Balance at end of period 35 41 35 41
Duke Energy Indiana        
Derivatives (net)        
Balance at beginning of period 5 11 13 29
Purchases, sales, issuances and settlements:        
Purchases 27 42 27 42
Settlements (9) (37) (20) (56)
Total gains included on the Condensed Consolidated Balance Sheet 10 21 13 22
Balance at end of period $ 33 $ 37 $ 33 $ 37