Related Party Transactions (Intercompany Income Taxes) (Details) - Related Party - USD ($) $ in Millions	Sep. 30, 2025	Dec. 31, 2024
Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax receivable	$ 0	$ 0
Intercompany income tax payable	65	419
Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	0
Intercompany income tax payable	101	169
Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax receivable	93	0
Intercompany income tax payable	0	315
Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	154
Intercompany income tax payable	192	0
Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	0
Intercompany income tax payable	23	43
Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax receivable	0	0
Intercompany income tax payable	28	110
Piedmont
Related Party Transaction [Line Items]
Intercompany income tax receivable	45	0
Intercompany income tax payable	$ 0	$ 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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Carrying amount due within one year of the balance sheet date (or one operating cycle, if longer) from tax authorities as of the balance sheet date representing refunds of overpayments or recoveries based on agreed-upon resolutions of disputes.

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