Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 30	$ 40
Interest cost on projected benefit obligation	86	58
Expected return on plan assets	(147)	(140)
Amortization of actuarial loss	2	24
Amortization of prior service credit	(3)	(5)
Amortization of settlement charges	5	2
Net periodic pension costs	(27)	(21)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	10	12
Interest cost on projected benefit obligation	21	14
Expected return on plan assets	(40)	(38)
Amortization of actuarial loss	0	5
Amortization of prior service credit	0	(1)
Amortization of settlement charges	2	1
Net periodic pension costs	(7)	(7)
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	9	12
Interest cost on projected benefit obligation	27	18
Expected return on plan assets	(50)	(46)
Amortization of actuarial loss	1	6
Amortization of settlement charges	1	1
Net periodic pension costs	(12)	(9)
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	7
Interest cost on projected benefit obligation	12	8
Expected return on plan assets	(23)	(22)
Amortization of actuarial loss	0	3
Amortization of settlement charges	1
Net periodic pension costs	(5)	(4)
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	3	4
Interest cost on projected benefit obligation	14	10
Expected return on plan assets	(26)	(24)
Amortization of actuarial loss	1	3
Net periodic pension costs	(8)	(7)
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1
Interest cost on projected benefit obligation	4	3
Expected return on plan assets	(6)	(5)
Amortization of actuarial loss		1
Net periodic pension costs	(1)
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	2
Interest cost on projected benefit obligation	7	5
Expected return on plan assets	(10)	(9)
Amortization of actuarial loss	1	2
Net periodic pension costs	(1)
Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1
Interest cost on projected benefit obligation	2	2
Expected return on plan assets	(5)	(6)
Amortization of actuarial loss		2
Amortization of prior service credit	(2)	(2)
Amortization of settlement charges	1
Net periodic pension costs	$ (3)	$ (3)