Leases (Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 275	$ 236
Short-term lease expense	7	5
Variable lease expense	33	27
Finance lease expense
Amortization of leased assets	113	160
Interest on lease liabilities	41	46
Total finance lease expense	154	206
Total lease expense	469	474
Duke Energy Carolinas
Lessee, Lease, Description [Line Items]
Operating lease expense	66	41
Variable lease expense	2	2
Finance lease expense
Amortization of leased assets	7	7
Interest on lease liabilities	31	31
Total finance lease expense	38	38
Total lease expense	106	81
Progress Energy
Lessee, Lease, Description [Line Items]
Operating lease expense	173	157
Short-term lease expense	3	2
Variable lease expense	29	22
Finance lease expense
Amortization of leased assets	46	57
Interest on lease liabilities	44	45
Total finance lease expense	90	102
Total lease expense	295	283
Duke Energy Progress
Lessee, Lease, Description [Line Items]
Operating lease expense	82	80
Short-term lease expense	1	1
Variable lease expense	19	11
Finance lease expense
Amortization of leased assets	38	35
Interest on lease liabilities	41	43
Total finance lease expense	79	78
Total lease expense	181	170
Duke Energy Florida
Lessee, Lease, Description [Line Items]
Operating lease expense	91	77
Short-term lease expense	2	1
Variable lease expense	10	11
Finance lease expense
Amortization of leased assets	8	22
Interest on lease liabilities	3	2
Total finance lease expense	11	24
Total lease expense	114	113
Duke Energy Ohio
Lessee, Lease, Description [Line Items]
Operating lease expense	12	11
Finance lease expense
Total lease expense	12	11
Duke Energy Indiana
Lessee, Lease, Description [Line Items]
Operating lease expense	23	17
Short-term lease expense	1	1
Variable lease expense	1
Finance lease expense
Interest on lease liabilities	1	1
Total finance lease expense	1	1
Total lease expense	26	19
Piedmont
Lessee, Lease, Description [Line Items]
Operating lease expense	2	2
Variable lease expense	1	1
Finance lease expense
Total lease expense	$ 3	$ 3