Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 29	$ 41	$ 59	$ 81
Interest cost on projected benefit obligation	86	59	172	117
Expected return on plan assets	(147)	(141)	(294)	(281)
Amortization of actuarial loss	3	23	5	47
Amortization of prior service credit	(4)	(4)	(7)	(9)
Amortization of settlement charges	4	2	9	4
Net periodic pension costs	(29)	(20)	(56)	(41)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	9	14	19	26
Interest cost on projected benefit obligation	21	13	42	27
Expected return on plan assets	(40)	(38)	(80)	(76)
Amortization of actuarial loss	1	5	1	10
Amortization of prior service credit	0	(1)	0	(2)
Amortization of settlement charges	2	2	4	3
Net periodic pension costs	(7)	(5)	(14)	(12)
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	7	11	16	23
Interest cost on projected benefit obligation	27	18	54	36
Expected return on plan assets	(49)	(47)	(99)	(93)
Amortization of actuarial loss	1	7	2	13
Amortization of settlement charges	1		2	1
Net periodic pension costs	(13)	(11)	(25)	(20)
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	5	7	10	14
Interest cost on projected benefit obligation	13	8	25	16
Expected return on plan assets	(23)	(22)	(46)	(44)
Amortization of actuarial loss	1	4	1	7
Amortization of settlement charges	1	1	2	1
Net periodic pension costs	(3)	(2)	(8)	(6)
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	4	6	7	10
Interest cost on projected benefit obligation	15	10	29	20
Expected return on plan assets	(26)	(24)	(52)	(48)
Amortization of actuarial loss	0	3	1	6
Amortization of settlement charges	1		1
Net periodic pension costs	(6)	(5)	(14)	(12)
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	0	1	1	2
Interest cost on projected benefit obligation	5	3	9	6
Expected return on plan assets	(6)	(6)	(12)	(11)
Amortization of actuarial loss		1		2
Net periodic pension costs	(1)	(1)	(2)	(1)
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	2	3	4
Interest cost on projected benefit obligation	7	5	14	10
Expected return on plan assets	(10)	(10)	(20)	(19)
Amortization of actuarial loss	0	3	1	5
Amortization of prior service credit	(1)	(1)	(1)	(1)
Amortization of settlement charges	1		1
Net periodic pension costs	(1)	(1)	(2)	(1)
Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	2	2	3
Interest cost on projected benefit obligation	3	2	5	4
Expected return on plan assets	(5)	(6)	(10)	(12)
Amortization of actuarial loss		1		3
Amortization of prior service credit	(2)	(2)	(4)	(4)
Amortization of settlement charges	1		2
Net periodic pension costs	$ (2)	$ (3)	$ (5)	$ (6)