Employee Benefit Plans (Projected Benefit Obligations Reconciliation of Funded Status to Net Amount Recognized) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plan
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	$ 58
Pension Plan | Duke Energy Carolinas
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	15
Pension Plan | Progress Energy
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	13
Pension Plan | Duke Energy Progress
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	8
Pension Plan | Duke Energy Florida
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	5
Pension Plan | Duke Energy Ohio
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	3
Pension Plan | Duke Energy Indiana
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	5
Pension Plan | Piedmont
Change in Fair Value of Plan Assets [Rollforward]
Employer contributions	2
Pension Plan | Qualified Plan
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	8,207	$ 8,634
Service cost	145	168	$ 165
Interest cost	249	220	269
Actuarial gain	(1,490)	(200)
Benefits paid	(753)	(615)
Obligation at measurement date	6,358	8,207	8,634
Accumulated Benefit Obligation at measurement date	6,324	8,144
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	9,235	9,337
Employer contributions	58
Actual return on plan assets	(1,547)	513
Benefits paid	(753)	(615)
Plan assets at measurement date	6,993	9,235	9,337
Funded status of plan	635	1,028
Pension Plan | Qualified Plan | Duke Energy Carolinas
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,903	1,988
Service cost	47	54	51
Interest cost	59	51	62
Actuarial gain	(301)	(42)
Benefits paid	(159)	(148)
Transfers	5
Obligation at measurement date	1,554	1,903	1,988
Accumulated Benefit Obligation at measurement date	1,556	1,904
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	2,365	2,381
Employer contributions	15
Actual return on plan assets	(411)	132
Benefits paid	(159)	(148)
Transfers	5
Plan assets at measurement date	1,815	2,365	2,381
Funded status of plan	261	462
Pension Plan | Qualified Plan | Progress Energy
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	2,560	2,715
Service cost	40	48	48
Interest cost	77	70	85
Actuarial gain	(513)	(108)
Benefits paid	(184)	(161)
Transfers	(5)	(4)
Obligation at measurement date	1,975	2,560	2,715
Accumulated Benefit Obligation at measurement date	1,959	2,529
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	3,053	3,049
Employer contributions	13
Actual return on plan assets	(506)	169
Benefits paid	(184)	(161)
Transfers	(5)	(4)
Plan assets at measurement date	2,371	3,053	3,049
Funded status of plan	396	493
Pension Plan | Qualified Plan | Duke Energy Progress
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,153	1,193
Service cost	24	28	27
Interest cost	35	30	38
Actuarial gain	(197)	(18)
Benefits paid	(101)	(80)
Transfers	(5)
Obligation at measurement date	909	1,153	1,193
Accumulated Benefit Obligation at measurement date	910	1,154
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,421	1,422
Employer contributions	8
Actual return on plan assets	(240)	79
Benefits paid	(101)	(80)
Transfers	(5)
Plan assets at measurement date	1,083	1,421	1,422
Funded status of plan	174	268
Pension Plan | Qualified Plan | Duke Energy Florida
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	1,392	1,507
Service cost	16	20	21
Interest cost	41	39	46
Actuarial gain	(312)	(89)
Benefits paid	(82)	(81)
Transfers		(4)
Obligation at measurement date	1,055	1,392	1,507
Accumulated Benefit Obligation at measurement date	1,038	1,361
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	1,610	1,605
Employer contributions	5
Actual return on plan assets	(262)	90
Benefits paid	(82)	(81)
Transfers		(4)
Plan assets at measurement date	1,271	1,610	1,605
Funded status of plan	216	218
Pension Plan | Qualified Plan | Duke Energy Ohio
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	450	502
Service cost	4	5	5
Interest cost	13	13	15
Actuarial gain	(84)	(10)
Benefits paid	(50)	(50)
Transfers		(10)
Obligation at measurement date	333	450	502
Accumulated Benefit Obligation at measurement date	327	439
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	438	472
Employer contributions	3
Actual return on plan assets	(68)	26
Benefits paid	(50)	(50)
Transfers		(10)
Plan assets at measurement date	323	438	472
Funded status of plan	(10)	(12)
Pension Plan | Qualified Plan | Duke Energy Indiana
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	680	715
Service cost	8	9	9
Interest cost	20	18	22
Actuarial gain	(143)	(10)
Benefits paid	(66)	(52)
Obligation at measurement date	499	680	715
Accumulated Benefit Obligation at measurement date	495	672
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	669	684
Employer contributions	5
Actual return on plan assets	(107)	37
Benefits paid	(66)	(52)
Plan assets at measurement date	501	669	684
Funded status of plan	2	(11)
Pension Plan | Qualified Plan | Piedmont
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	273	293
Service cost	5	6	6
Interest cost	8	7	9
Actuarial gain	(47)	(5)
Benefits paid	(69)	(28)
Obligation at measurement date	170	273	293
Accumulated Benefit Obligation at measurement date		274
Accumulated Benefit Obligation at measurement date	170
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	334	343
Employer contributions	2
Actual return on plan assets	(64)	19
Benefits paid	(69)	(28)
Plan assets at measurement date	203	334	343
Funded status of plan	33	61
Other Post-Retirement Benefit Plans
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	625	709
Service cost	3	4	4
Interest cost	17	18	23
Plan participants' contributions	11	14
Actuarial gain	(80)	(47)
Plan amendments	(71)
Benefits paid	(68)	(73)
Obligation at measurement date	437	625	709
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	211	237
Employer contributions	39
Actual return on plan assets	(31)	15
Benefits paid	(68)	(73)
Plan participants' contributions	11	14
Employer contributions		18
Plan assets at measurement date	162	211	237
Funded status of plan	(275)	(414)
Other Post-Retirement Benefit Plans | Duke Energy Carolinas
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	149	174
Service cost	1	1	1
Interest cost	4	4	5
Plan participants' contributions	2	3
Actuarial gain	(17)	(14)
Plan amendments	(11)
Benefits paid	(16)	(19)
Obligation at measurement date	112	149	174
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	135	139
Employer contributions	3
Actual return on plan assets	(19)	9
Benefits paid	(16)	(19)
Plan participants' contributions	2	3
Employer contributions		3
Plan assets at measurement date	105	135	139
Funded status of plan	(7)	(14)
Other Post-Retirement Benefit Plans | Progress Energy
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	263	299
Service cost		1	1
Interest cost	7	7	10
Plan participants' contributions	4	5
Actuarial gain	(43)	(20)
Plan amendments	(37)
Benefits paid	(26)	(29)
Obligation at measurement date	168	263	299
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	(1)	(1)
Employer contributions	23
Benefits paid	(26)	(29)
Plan participants' contributions	4	5
Employer contributions		24
Plan assets at measurement date		(1)	(1)
Funded status of plan	(168)	(264)
Other Post-Retirement Benefit Plans | Duke Energy Progress
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	147	166
Interest cost	4	4	5
Plan participants' contributions	2	3
Actuarial gain	(27)	(10)
Plan amendments	(18)
Benefits paid	(13)	(16)
Obligation at measurement date	95	147	166
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	(2)	(2)
Employer contributions	11
Benefits paid	(13)	(16)
Plan participants' contributions	2	3
Employer contributions		13
Plan assets at measurement date	(2)	(2)	(2)
Funded status of plan	(97)	(149)
Other Post-Retirement Benefit Plans | Duke Energy Florida
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	112	130
Interest cost	3	3	4
Plan participants' contributions	2	2
Actuarial gain	(16)	(10)
Plan amendments	(19)
Benefits paid	(13)	(13)
Obligation at measurement date	69	112	130
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	(2)	(1)
Employer contributions	11
Benefits paid	(13)	(13)
Plan participants' contributions	2	2
Employer contributions		10
Plan assets at measurement date	(2)	(2)	(1)
Funded status of plan	(71)	(114)
Other Post-Retirement Benefit Plans | Duke Energy Ohio
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	25	27
Interest cost	1	1	1
Plan participants' contributions	1	1
Actuarial gain	(3)	(1)
Benefits paid	(4)	(3)
Obligation at measurement date	20	25	27
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	9	9
Employer contributions	3
Actual return on plan assets	(2)	1
Benefits paid	(4)	(3)
Plan participants' contributions	1	1
Employer contributions		1
Plan assets at measurement date	7	9	9
Funded status of plan	(13)	(16)
Other Post-Retirement Benefit Plans | Duke Energy Indiana
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	54	61
Service cost		1	1
Interest cost	1	1	2
Plan participants' contributions	1	2
Actuarial gain	(1)	(2)
Plan amendments	(17)
Benefits paid	(8)	(9)
Obligation at measurement date	30	54	61
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	6	7
Employer contributions	4
Benefits paid	(8)	(9)
Plan participants' contributions	1	2
Employer contributions		6
Plan assets at measurement date	3	6	7
Funded status of plan	(27)	(48)
Other Post-Retirement Benefit Plans | Piedmont
Change in Projected Benefit Obligation [Rollforward]
Obligation at prior measurement date	27	30
Interest cost	1	1	1
Actuarial gain	(5)	(2)
Benefits paid	(2)	(2)
Obligation at measurement date	21	27	30
Change in Fair Value of Plan Assets [Rollforward]
Plan assets at prior measurement date	39	37
Employer contributions	1
Actual return on plan assets	(7)	3
Benefits paid	(2)	(2)
Employer contributions		1
Plan assets at measurement date	31	39	$ 37
Funded status of plan	$ 10	$ 12