Leases (Lease Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Lessee, Lease, Description [Line Items]
Operating lease expense	$ 229	$ 245
Short-term lease expense	4	5
Variable lease expense	61	41
Finance lease expense
Amortization of leased assets	151	219
Interest on lease liabilities	50	55
Total finance lease expense	201	274
Total lease expense	495	565
Duke Energy Carolinas
Lessee, Lease, Description [Line Items]
Operating lease expense	39	43
Variable lease expense	(1)	17
Finance lease expense
Amortization of leased assets	6	5
Interest on lease liabilities	32	33
Total finance lease expense	38	38
Total lease expense	76	98
Progress Energy
Lessee, Lease, Description [Line Items]
Operating lease expense	153	155
Short-term lease expense	1	2
Variable lease expense	60	22
Finance lease expense
Amortization of leased assets	61	37
Interest on lease liabilities	49	48
Total finance lease expense	110	85
Total lease expense	324	264
Duke Energy Progress
Lessee, Lease, Description [Line Items]
Operating lease expense	83	83
Short-term lease expense		1
Variable lease expense	37	10
Finance lease expense
Amortization of leased assets	41	18
Interest on lease liabilities	45	42
Total finance lease expense	86	60
Total lease expense	206	154
Duke Energy Florida
Lessee, Lease, Description [Line Items]
Operating lease expense	70	72
Short-term lease expense	1	1
Variable lease expense	23	12
Finance lease expense
Amortization of leased assets	20	19
Interest on lease liabilities	4	6
Total finance lease expense	24	25
Total lease expense	118	110
Duke Energy Ohio
Lessee, Lease, Description [Line Items]
Operating lease expense	10	11
Finance lease expense
Total lease expense	10	11
Duke Energy Indiana
Lessee, Lease, Description [Line Items]
Operating lease expense	19	18
Short-term lease expense	2	2
Finance lease expense
Amortization of leased assets		1
Interest on lease liabilities	1
Total finance lease expense	1	1
Total lease expense	22	21
Piedmont
Lessee, Lease, Description [Line Items]
Operating lease expense	6	7
Variable lease expense	1	1
Finance lease expense
Total lease expense	$ 7	$ 8