Related Party Transactions (Intercompany Income Taxes) (Details) - Related Party - USD ($) $ in Millions	Dec. 31, 2025	Dec. 31, 2024
Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax payable	$ 81	$ 419
Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax payable	72	169
Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax payable	77	315
Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax receivable		154
Intercompany income tax payable	12
Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax payable	10	43
Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax payable	39	110
Piedmont
Related Party Transaction [Line Items]
Intercompany income tax payable	$ 59	$ 43

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

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