Leases (Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 236	$ 229
Short-term lease expense	5	4
Variable lease expense	27	61
Finance lease expense
Amortization of leased assets	160	151
Interest on lease liabilities	46	50
Total finance lease expense	206	201
Total lease expense	474	495
Duke Energy Carolinas
Lessee, Lease, Description [Line Items]
Operating lease expense	41	39
Variable lease expense	2	1
Finance lease expense
Amortization of leased assets	7	6
Interest on lease liabilities	31	32
Total finance lease expense	38	38
Total lease expense	81	76
Progress Energy
Lessee, Lease, Description [Line Items]
Operating lease expense	157	153
Short-term lease expense	2	1
Variable lease expense	22	60
Finance lease expense
Amortization of leased assets	57	61
Interest on lease liabilities	45	49
Total finance lease expense	102	110
Total lease expense	283	324
Duke Energy Progress
Lessee, Lease, Description [Line Items]
Operating lease expense	80	83
Short-term lease expense	1
Variable lease expense	11	37
Finance lease expense
Amortization of leased assets	35	41
Interest on lease liabilities	43	45
Total finance lease expense	78	86
Total lease expense	170	206
Duke Energy Florida
Lessee, Lease, Description [Line Items]
Operating lease expense	77	70
Short-term lease expense	1	1
Variable lease expense	11	23
Finance lease expense
Amortization of leased assets	22	20
Interest on lease liabilities	2	4
Total finance lease expense	24	24
Total lease expense	113	118
Duke Energy Ohio
Lessee, Lease, Description [Line Items]
Operating lease expense	11	10
Finance lease expense
Total lease expense	11	10
Duke Energy Indiana
Lessee, Lease, Description [Line Items]
Operating lease expense	17	19
Short-term lease expense	1	2
Finance lease expense
Interest on lease liabilities	1	1
Total finance lease expense	1	1
Total lease expense	19	22
Piedmont
Lessee, Lease, Description [Line Items]
Operating lease expense	2	6
Variable lease expense	1	1
Finance lease expense
Total lease expense	$ 3	$ 7