Employee Benefit Plans (Components of Net Periodic Pension Costs) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	$ 110	$ 145
Interest cost on projected benefit obligation	344	249
Amortization of regulatory asset	3	3	$ 3
Pension Plan | Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	36	47
Interest cost on projected benefit obligation	84	59	51
Expected return on plan assets	(160)	(152)	(141)
Amortization of actuarial loss	2	16	29
Amortization of prior service credit	(1)	(3)	(8)
Amortization of settlement charges(c)	9	9	5
MRVA method change		0
Net periodic pension costs	(28)	(23)	(8)
Service cost	38	48	56
Pension Plan | Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	30	40
Interest cost on projected benefit obligation	107	77	70
Expected return on plan assets	(198)	(183)	(187)
Amortization of actuarial loss	4	23	38
Amortization of prior service credit			(2)
Amortization of settlement charges(c)	5	8	2
MRVA method change		24
Net periodic pension costs	(49)	(8)	(29)
Service cost	33	43	50
Pension Plan | Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	18	24
Interest cost on projected benefit obligation	49	35	30
Expected return on plan assets	(93)	(88)	(84)
Amortization of actuarial loss	2	12	18
Amortization of prior service credit			(1)
Amortization of settlement charges(c)	3	7	2
MRVA method change		0
Net periodic pension costs	(20)	(9)	(6)
Service cost	19	25	29
Pension Plan | Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	12	16
Interest cost on projected benefit obligation	57	41	39
Expected return on plan assets	(104)	(94)	(102)
Amortization of actuarial loss	2	12	20
Amortization of prior service credit			(1)
Amortization of settlement charges(c)	1	1	1
MRVA method change		24
Net periodic pension costs	(31)	1	(22)
Service cost	13	17	21
Pension Plan | Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	3	4
Interest cost on projected benefit obligation	18	13	13
Expected return on plan assets	(24)	(23)	(28)
Amortization of actuarial loss		4	7
Amortization of prior service credit			(1)
Amortization of settlement charges(c)		5
MRVA method change		0
Net periodic pension costs	(3)	3	(4)
Amortization of regulatory asset	1	1	1
Service cost	3	4	5
Pension Plan | Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	6	8
Interest cost on projected benefit obligation	27	20	18
Expected return on plan assets	(40)	(37)	(40)
Amortization of actuarial loss	2	9	13
Amortization of prior service credit	(2)	(2)	(2)
Amortization of settlement charges(c)	1	1
MRVA method change		0
Net periodic pension costs	(6)		(1)
Service cost	6	9	10
Pension Plan | Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	3	5
Interest cost on projected benefit obligation	9	8	7
Expected return on plan assets	(20)	(24)	(20)
Amortization of actuarial loss		5	10
Amortization of prior service credit	(7)	(7)	(9)
Amortization of settlement charges(c)	4	7	1
MRVA method change		0
Net periodic pension costs	(10)	(6)	(5)
Service cost	4	5	6
Pension Plan | Parent
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost on projected benefit obligation	344	249	220
Expected return on plan assets	(588)	(558)	(558)
Amortization of actuarial loss	10	81	133
Amortization of prior service credit	(14)	(18)	(29)
Amortization of settlement charges(c)	19	32	9
MRVA method change		24
Net periodic pension costs	(112)	(38)	(49)
Service cost	117	152	176
Other Post-Retirement Benefit Plans
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	2	3	4
Interest cost on projected benefit obligation	22	17	18
Expected return on plan assets	(11)	(10)	(11)
Amortization of actuarial loss	(6)	2	2
Amortization of prior service credit	(23)	(8)	(13)
Net periodic pension costs	(16)	4
Amortization of regulatory asset	4	4	5
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost	1	1	1
Interest cost on projected benefit obligation	5	4	4
Expected return on plan assets	(7)	(6)	(7)
Amortization of actuarial loss	(3)
Amortization of prior service credit	(5)	(3)	(4)
Net periodic pension costs	(9)	(4)	(6)
Other Post-Retirement Benefit Plans | Progress Energy
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost			1
Interest cost on projected benefit obligation	9	7	7
Amortization of actuarial loss	8	1	1
Amortization of prior service credit	(11)	(2)	(2)
Net periodic pension costs	6	6	7
Other Post-Retirement Benefit Plans | Duke Energy Progress
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost on projected benefit obligation	5	4	4
Amortization of actuarial loss	5	1
Amortization of prior service credit	(6)	(1)	(1)
Net periodic pension costs	4	4	3
Other Post-Retirement Benefit Plans | Duke Energy Florida
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost on projected benefit obligation	4	3	3
Amortization of actuarial loss	2	1	1
Amortization of prior service credit	(5)	(1)	(1)
Net periodic pension costs	1	3	3
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost on projected benefit obligation	1	1	1
Amortization of actuarial loss	(2)
Amortization of prior service credit			(1)
Net periodic pension costs	(1)	1
Amortization of regulatory asset	1	1	1
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Service cost			1
Interest cost on projected benefit obligation	1	1	1
Amortization of actuarial loss	(3)		4
Amortization of prior service credit	(5)		(1)
Net periodic pension costs	(7)	1	5
Other Post-Retirement Benefit Plans | Piedmont
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]
Interest cost on projected benefit obligation	1	1	1
Expected return on plan assets	(2)	(2)	(2)
Amortization of prior service credit		(2)	(2)
Net periodic pension costs	$ (1)	$ (3)	$ (3)