Employee Benefit Plans (Projected Benefit Obligations Reconciliation of Funded Status to Net Amount Recognized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Pension Plan
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	$ 6,358	$ 8,207
Service cost	110	145
Interest cost	344	249
Actuarial loss	94	(1,490)
Benefits paid	(607)	(753)
Obligation at measurement date	6,299	6,358	$ 8,207
Accumulated Benefit Obligation at measurement date	6,267	6,324
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	6,993	9,235
Employer contributions	100	58
Actual return on plan assets	676	(1,547)
Benefits paid	(607)	(753)
Plan assets at measurement date	7,162	6,993	9,235
Funded status of plan	863	635
Pension Plan | Nonqualified Plan
Change in Projected Benefit Obligation [Rollforward]
Benefits paid	(24)
Obligation at measurement date	224
Accumulated Benefit Obligation at measurement date	224
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	24
Pension Plan | Duke Energy Carolinas
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,554	1,903
Service cost	36	47
Interest cost	84	59	51
Actuarial loss	11	(301)
Benefits paid	(177)	(159)
Transfers	(6)	(5)
Obligation at measurement date	1,514	1,554	1,903
Accumulated Benefit Obligation at measurement date	1,517	1,556
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,815	2,365
Employer contributions	26	15
Actual return on plan assets	183	(411)
Benefits paid	(177)	(159)
Transfers	6	5
Plan assets at measurement date	1,853	1,815	2,365
Funded status of plan	339	261
Pension Plan | Duke Energy Carolinas | Nonqualified Plan
Change in Projected Benefit Obligation [Rollforward]
Benefits paid	(1)
Obligation at measurement date	10
Accumulated Benefit Obligation at measurement date	10
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	1
Pension Plan | Progress Energy
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,975	2,560
Service cost	30	40
Interest cost	107	77	70
Actuarial loss	47	(513)
Benefits paid	(159)	(184)
Transfers	10	5
Obligation at measurement date	1,990	1,975	2,560
Accumulated Benefit Obligation at measurement date	1,975	1,959
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	2,371	3,053
Employer contributions	22	13
Actual return on plan assets	229	(506)
Benefits paid	(159)	(184)
Transfers	(10)	(5)
Plan assets at measurement date	2,453	2,371	3,053
Funded status of plan	463	396
Pension Plan | Progress Energy | Nonqualified Plan
Change in Projected Benefit Obligation [Rollforward]
Benefits paid	(8)
Obligation at measurement date	78
Accumulated Benefit Obligation at measurement date	78
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	8
Pension Plan | Duke Energy Progress
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	909	1,153
Service cost	18	24
Interest cost	49	35	30
Actuarial loss	18	(197)
Benefits paid	(80)	(101)
Transfers	3	5
Obligation at measurement date	911	909	1,153
Accumulated Benefit Obligation at measurement date	912	910
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,083	1,421
Employer contributions	13	8
Actual return on plan assets	107	(240)
Benefits paid	(80)	(101)
Transfers	(3)	(5)
Plan assets at measurement date	1,120	1,083	1,421
Funded status of plan	209	174
Pension Plan | Duke Energy Progress | Nonqualified Plan
Change in Projected Benefit Obligation [Rollforward]
Benefits paid	(3)
Obligation at measurement date	23
Accumulated Benefit Obligation at measurement date	23
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	3
Pension Plan | Duke Energy Florida
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,055	1,392
Service cost	12	16
Interest cost	57	41	39
Actuarial loss	29	(312)
Benefits paid	(78)	(82)
Transfers	6
Obligation at measurement date	1,069	1,055	1,392
Accumulated Benefit Obligation at measurement date	1,053	1,038
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,271	1,610
Employer contributions	9	5
Actual return on plan assets	120	(262)
Benefits paid	(78)	(82)
Transfers	(6)
Plan assets at measurement date	1,316	1,271	1,610
Funded status of plan	247	216
Pension Plan | Duke Energy Florida | Nonqualified Plan
Change in Projected Benefit Obligation [Rollforward]
Benefits paid	(3)
Obligation at measurement date	31
Accumulated Benefit Obligation at measurement date	31
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	3
Pension Plan | Duke Energy Ohio
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	333	450
Service cost	3	4
Interest cost	18	13	13
Actuarial loss	2	(84)
Benefits paid	(31)	(50)
Obligation at measurement date	325	333	450
Accumulated Benefit Obligation at measurement date	317	327
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	323	438
Employer contributions	5	3
Actual return on plan assets	29	(68)
Benefits paid	(31)	(50)
Plan assets at measurement date	326	323	438
Funded status of plan	1	(10)
Pension Plan | Duke Energy Ohio | Nonqualified Plan
Change in Projected Benefit Obligation [Rollforward]
Obligation at measurement date	2
Accumulated Benefit Obligation at measurement date	2
Pension Plan | Duke Energy Indiana
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	499	680
Service cost	6	8
Interest cost	27	20	18
Actuarial loss	4	(143)
Benefits paid	(40)	(66)
Obligation at measurement date	496	499	680
Accumulated Benefit Obligation at measurement date	494	495
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	501	669
Employer contributions	8	5
Actual return on plan assets	45	(107)
Benefits paid	(40)	(66)
Plan assets at measurement date	514	501	669
Funded status of plan	18	2
Pension Plan | Duke Energy Indiana | Nonqualified Plan
Change in Projected Benefit Obligation [Rollforward]
Obligation at measurement date	2
Accumulated Benefit Obligation at measurement date	2
Pension Plan | Piedmont
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	170	273
Service cost	3	5
Interest cost	9	8	7
Actuarial loss	9	(47)
Benefits paid	(16)	(69)
Obligation at measurement date	175	170	273
Accumulated Benefit Obligation at measurement date	176	170
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	203	334
Employer contributions	3	2
Actual return on plan assets	23	(64)
Benefits paid	(16)	(69)
Plan assets at measurement date	213	203	334
Funded status of plan	38	33
Pension Plan | Piedmont | Nonqualified Plan
Change in Projected Benefit Obligation [Rollforward]
Obligation at measurement date	2
Accumulated Benefit Obligation at measurement date	2
Other Post-Retirement Benefit Plans
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	437	625
Service cost	2	3	4
Interest cost	22	17	18
Plan participants' contributions	4	11
Actuarial loss	(10)	(80)
Benefits paid	(58)	(68)
Transfers	50	(71)
Obligation at measurement date	347	437	625
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	162	211
Employer contributions	42
Actual return on plan assets	19	(31)
Benefits paid	(58)	(68)
Transfers	(13)
Plan participants' contributions	4	11
Employer contributions		39
Plan assets at measurement date	156	162	211
Defined Benefit Plan, Plan Assets, 401(h) Obligation Transferred To (From) Plan	0
Funded status of plan	(191)	(275)
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	112	149
Service cost	1	1	1
Interest cost	5	4	4
Plan participants' contributions	1	2
Actuarial loss	(2)	(17)
Benefits paid	(14)	(16)
Transfers	34	(11)
Obligation at measurement date	69	112	149
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	105	135
Employer contributions	6
Actual return on plan assets	8	(19)
Benefits paid	(14)	(16)
Transfers	4
Plan participants' contributions	1	2
Employer contributions		3
Plan assets at measurement date	102	105	135
Defined Benefit Plan, Plan Assets, 401(h) Obligation Transferred To (From) Plan	(8)
Funded status of plan	33	(7)
Other Post-Retirement Benefit Plans | Progress Energy
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	168	263
Service cost			1
Interest cost	9	7	7
Plan participants' contributions	1	4
Actuarial loss	(10)	(43)
Benefits paid	(22)	(26)
Transfers	0	(37)
Obligation at measurement date	146	168	263
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date		(1)
Employer contributions	20
Benefits paid	(22)	(26)
Transfers	0
Plan participants' contributions	1	4
Employer contributions		23
Plan assets at measurement date	(1)		(1)
Defined Benefit Plan, Plan Assets, 401(h) Obligation Transferred To (From) Plan	0
Funded status of plan	(147)	(168)
Other Post-Retirement Benefit Plans | Duke Energy Progress
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	95	147
Interest cost	5	4	4
Plan participants' contributions	1	2
Actuarial loss	(6)	(27)
Benefits paid	(11)	(13)
Transfers	0	(18)
Obligation at measurement date	84	95	147
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	(2)	(2)
Employer contributions	11
Benefits paid	(11)	(13)
Transfers	0
Plan participants' contributions	1	2
Employer contributions		11
Plan assets at measurement date	(1)	(2)	(2)
Defined Benefit Plan, Plan Assets, 401(h) Obligation Transferred To (From) Plan	0
Funded status of plan	(85)	(97)
Other Post-Retirement Benefit Plans | Duke Energy Florida
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	69	112
Interest cost	4	3	3
Plan participants' contributions	1	2
Actuarial loss	(4)	(16)
Benefits paid	(10)	(13)
Transfers	0	(19)
Obligation at measurement date	60	69	112
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	(2)	(2)
Employer contributions	10
Benefits paid	(10)	(13)
Transfers	0
Plan participants' contributions	1	2
Employer contributions		11
Plan assets at measurement date	(1)	(2)	(2)
Defined Benefit Plan, Plan Assets, 401(h) Obligation Transferred To (From) Plan	0
Funded status of plan	(61)	(71)
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	20	25
Interest cost	1	1	1
Plan participants' contributions		1
Actuarial loss	1	(3)
Benefits paid	(3)	(4)
Transfers	0	0
Obligation at measurement date	19	20	25
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	7	9
Employer contributions	2
Actual return on plan assets	1	(2)
Benefits paid	(3)	(4)
Transfers	0
Plan participants' contributions		1
Employer contributions		3
Plan assets at measurement date	7	7	9
Defined Benefit Plan, Plan Assets, 401(h) Obligation Transferred To (From) Plan	0
Funded status of plan	(12)	(13)
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	30	54
Service cost			1
Interest cost	1	1	1
Plan participants' contributions		1
Actuarial loss	(1)	(1)
Benefits paid	(6)	(8)
Transfers	0	(17)
Obligation at measurement date	24	30	54
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	3	6
Employer contributions	6
Benefits paid	(6)	(8)
Transfers	0
Plan participants' contributions		1
Employer contributions		4
Plan assets at measurement date	3	3	6
Defined Benefit Plan, Plan Assets, 401(h) Obligation Transferred To (From) Plan	0
Funded status of plan	(21)	(27)
Other Post-Retirement Benefit Plans | Piedmont
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	21	27
Interest cost	1	1	1
Actuarial loss	1	(5)
Benefits paid	(2)	(2)
Transfers	6	0
Obligation at measurement date	15	21	27
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	31	39
Employer contributions	1
Actual return on plan assets	4	(7)
Benefits paid	(2)	(2)
Transfers	(7)
Employer contributions		1
Plan assets at measurement date	27	31	$ 39
Defined Benefit Plan, Plan Assets, 401(h) Obligation Transferred To (From) Plan	0
Funded status of plan	$ 12	$ 10