Related Party Transactions (Intercompany Income Taxes) (Details) - USD ($) $ in Millions	1 Months Ended
Mar. 31, 2026	Dec. 31, 2025
Progress Energy
Related Party Transaction [Line Items]
Cash transferred between affiliates	$ 2,800
Related Party \| Duke Energy Carolinas
Related Party Transaction [Line Items]
Intercompany income tax receivable	122
Intercompany income tax payable	0	$ 81
Related Party \| Progress Energy
Related Party Transaction [Line Items]
Intercompany income tax receivable	150
Intercompany income tax payable	0	72
Related Party \| Duke Energy Progress
Related Party Transaction [Line Items]
Intercompany income tax receivable	89
Intercompany income tax payable	0	77
Related Party \| Duke Energy Florida
Related Party Transaction [Line Items]
Intercompany income tax receivable	57
Intercompany income tax payable	0	12
Related Party \| Duke Energy Ohio
Related Party Transaction [Line Items]
Intercompany income tax receivable	0
Intercompany income tax payable	26	10
Related Party \| Duke Energy Indiana
Related Party Transaction [Line Items]
Intercompany income tax receivable	0
Intercompany income tax payable	31	39
Related Party \| Piedmont
Related Party Transaction [Line Items]
Intercompany income tax receivable	0
Intercompany income tax payable	$ 481	$ 59

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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