Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 29	$ 29	$ 57	$ 59
Interest cost on projected benefit obligation	83	86	165	172
Expected return on plan assets	(154)	(147)	(308)	(294)
Amortization of actuarial loss	8	3	16	5
Amortization of prior service credit	(4)	(4)	(7)	(7)
Amortization of settlement charges	4	4	9	9
Net periodic pension costs	(34)	(29)	(68)	(56)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	10	9	19	19
Interest cost on projected benefit obligation	20	21	40	42
Expected return on plan assets	(40)	(40)	(81)	(80)
Amortization of actuarial loss	2	1	4	1
Amortization of prior service credit	0	0	0	0
Amortization of settlement charges	2	2	4	4
Net periodic pension costs	(6)	(7)	(14)	(14)
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	8	7	16	16
Interest cost on projected benefit obligation	26	27	52	54
Expected return on plan assets	(54)	(49)	(108)	(99)
Amortization of actuarial loss	3	1	5	2
Amortization of prior service credit	0	0	0	0
Amortization of settlement charges	1	1	2	2
Net periodic pension costs	(16)	(13)	(33)	(25)
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	5	10	10
Interest cost on projected benefit obligation	12	13	24	25
Expected return on plan assets	(25)	(23)	(50)	(46)
Amortization of actuarial loss	2	1	3	1
Amortization of prior service credit	0	0	0	0
Amortization of settlement charges	1	1	2	2
Net periodic pension costs	(5)	(3)	(11)	(8)
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	4	4	7	7
Interest cost on projected benefit obligation	14	15	28	29
Expected return on plan assets	(29)	(26)	(58)	(52)
Amortization of actuarial loss	1	0	2	1
Amortization of prior service credit	0	0	0	0
Amortization of settlement charges	1	1	1	1
Net periodic pension costs	(9)	(6)	(20)	(14)
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	0	1	1
Interest cost on projected benefit obligation	4	5	8	9
Expected return on plan assets	(7)	(6)	(13)	(12)
Amortization of actuarial loss	1	0	1	0
Amortization of prior service credit	0	0	0	0
Amortization of settlement charges	0	0	0	0
Net periodic pension costs	(2)	(1)	(3)	(2)
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	2	3	3
Interest cost on projected benefit obligation	7	7	13	14
Expected return on plan assets	(11)	(10)	(21)	(20)
Amortization of actuarial loss	1	0	2	1
Amortization of prior service credit	(1)	(1)	(1)	(1)
Amortization of settlement charges	1	1	1	1
Net periodic pension costs	(2)	(1)	(3)	(2)
Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	2	2
Interest cost on projected benefit obligation	3	3	5	5
Expected return on plan assets	(5)	(5)	(10)	(10)
Amortization of actuarial loss	0	0	1	0
Amortization of prior service credit	(2)	(2)	(4)	(4)
Amortization of settlement charges	1	1	2	2
Net periodic pension costs	$ (2)	$ (2)	$ (4)	$ (5)