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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 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Derivatives (net)        
Balance at beginning of period $ (156) $ (131) $ (121) $ (77)
Total pretax realized or unrealized gains included in earnings 15   15  
Total pretax realized or unrealized losses included in comprehensive income (5) (11) (115) (86)
Purchases, sales, issuances and settlements:        
Purchases     77 21
Settlements (6) 4 12 (4)
Total (losses) gains included on the Condensed Consolidated Balance Sheet (9) 7 (29) 15
Balance at end of period (161) (131) (161) (131)
Duke Energy Indiana        
Derivatives (net)        
Balance at beginning of period 84 22 22 6
Purchases, sales, issuances and settlements:        
Purchases     74 18
Settlements (20) (3) (10) (12)
Total (losses) gains included on the Condensed Consolidated Balance Sheet (8) 5 (30) 12
Balance at end of period $ 56 $ 24 $ 56 $ 24