Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 28	$ 39	$ 87	$ 120
Interest cost on projected benefit obligation	86	58	258	175
Expected return on plan assets	(147)	(140)	(441)	(421)
Amortization of actuarial loss	2	24	7	71
Amortization of prior service credit	(3)	(5)	(10)	(14)
Amortization of settlement charges	5	14	14	18
Net periodic pension costs	(29)	(10)	(85)	(51)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	9	12	28	38
Interest cost on projected benefit obligation	21	14	63	41
Expected return on plan assets	(40)	(38)	(120)	(114)
Amortization of actuarial loss	0	5	1	15
Amortization of prior service credit	0	(1)	0	(3)
Amortization of settlement charges	3	3	7	6
Net periodic pension costs	(7)	(5)	(21)	(17)
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	9	11	25	34
Interest cost on projected benefit obligation	26	19	80	55
Expected return on plan assets	(50)	(46)	(149)	(139)
Amortization of actuarial loss	1	6	3	19
Amortization of settlement charges	1	5	3	6
Net periodic pension costs	(13)	(5)	(38)	(25)
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	6	15	20
Interest cost on projected benefit obligation	12	9	37	25
Expected return on plan assets	(24)	(22)	(70)	(66)
Amortization of actuarial loss	0	3	1	10
Amortization of settlement charges	1	4	3	5
Net periodic pension costs	(6)	0	(14)	(6)
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	3	4	10	14
Interest cost on projected benefit obligation	14	10	43	30
Expected return on plan assets	(26)	(24)	(78)	(72)
Amortization of actuarial loss	1	3	2	9
Amortization of settlement charges		1	1	1
Net periodic pension costs	(8)	(6)	(22)	(18)
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	2	3
Interest cost on projected benefit obligation	4	3	13	9
Expected return on plan assets	(6)	(6)	(18)	(17)
Amortization of actuarial loss		2		4
Amortization of settlement charges		2		2
Net periodic pension costs	(1)	2	(3)	1
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	3	4	7
Interest cost on projected benefit obligation	6	4	20	14
Expected return on plan assets	(10)	(9)	(30)	(28)
Amortization of actuarial loss	1	3	2	8
Amortization of prior service credit			(1)	(1)
Amortization of settlement charges		1	1	1
Net periodic pension costs	(2)	2	(4)	1
Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	3	4
Interest cost on projected benefit obligation	2	2	7	6
Expected return on plan assets	(5)	(6)	(15)	(18)
Amortization of actuarial loss		2		5
Amortization of prior service credit	(1)	(2)	(5)	(6)
Amortization of settlement charges	1	2	3	2
Net periodic pension costs	$ (2)	$ (1)	$ (7)	$ (7)