Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - Qualified Pension Plans - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 39	$ 43	$ 120	$ 131
Interest cost on projected benefit obligation	58	55	175	165
Expected return on plan assets	(140)	(139)	(421)	(418)
Amortization of actuarial loss	24	33	71	100
Amortization of prior service credit	(5)	(7)	(14)	(22)
Amortization of settlement charges	14	2	18	6
Net periodic pension costs	(10)	(13)	(51)	(38)
Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	12	14	38	42
Interest cost on projected benefit obligation	14	13	41	38
Expected return on plan assets	(38)	(36)	(114)	(106)
Amortization of actuarial loss	5	7	15	22
Amortization of prior service credit	(1)	(2)	(3)	(6)
Amortization of settlement charges	3	1	6	4
Net periodic pension costs	(5)	(3)	(17)	(6)
Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	11	13	34	38
Interest cost on projected benefit obligation	19	17	55	52
Expected return on plan assets	(46)	(47)	(139)	(141)
Amortization of actuarial loss	6	10	19	29
Amortization of prior service credit		(1)		(2)
Amortization of settlement charges	5	1	6	2
Net periodic pension costs	(5)	(7)	(25)	(22)
Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	6	7	20	22
Interest cost on projected benefit obligation	9	8	25	23
Expected return on plan assets	(22)	(21)	(66)	(63)
Amortization of actuarial loss	3	5	10	14
Amortization of prior service credit				(1)
Amortization of settlement charges	4		5	1
Net periodic pension costs		(1)	(6)	(4)
Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	4	5	14	16
Interest cost on projected benefit obligation	10	10	30	29
Expected return on plan assets	(24)	(25)	(72)	(76)
Amortization of actuarial loss	3	5	9	15
Amortization of prior service credit		(1)		(1)
Amortization of settlement charges	1		1
Net periodic pension costs	(6)	(6)	(18)	(17)
Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	2	3	4
Interest cost on projected benefit obligation	3	2	9	9
Expected return on plan assets	(6)	(7)	(17)	(21)
Amortization of actuarial loss	2	2	4	5
Amortization of settlement charges	2		2
Net periodic pension costs	2	(1)	1	(3)
Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	3	2	7	7
Interest cost on projected benefit obligation	4	5	14	14
Expected return on plan assets	(9)	(10)	(28)	(30)
Amortization of actuarial loss	3	3	8	10
Amortization of prior service credit			(1)	(1)
Amortization of settlement charges	1		1
Net periodic pension costs	2		1
Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	4	4
Interest cost on projected benefit obligation	2	2	6	6
Expected return on plan assets	(6)	(5)	(18)	(15)
Amortization of actuarial loss	2	2	5	7
Amortization of prior service credit	(2)	(1)	(6)	(6)
Amortization of settlement charges	2	$ 1	2	1
Net periodic pension costs	$ (1)		$ (7)	$ (3)