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Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale
Estimated Fair Value	$ 3,419
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	6,133	$ 5,019
Unrealized Holding Losses	111	171
Estimated Fair Value	12,050	10,603
NDTF
Cash and Cash Equivalents
Estimated Fair Value	151	133
Equity Securities, FV-NI
Gross Unrealized Holding Gains	6,005	4,942
Gross Unrealized Holding Losses	11	22
Estimated Fair Value	8,224	7,278
Debt Securities, Available-for-sale
Estimated Fair Value	3,135	2,732
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	6,070	4,985
Unrealized Holding Losses	103	159
Estimated Fair Value	11,510	10,143
Other Investments
Cash and Cash Equivalents
Estimated Fair Value	68	31
Equity Securities, FV-NI
Gross Unrealized Holding Gains	62	33
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	188	158
Debt Securities, Available-for-sale
Estimated Fair Value	284	271
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	63	34
Unrealized Holding Losses	8	12
Estimated Fair Value	540	460
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	1,707
Duke Energy Carolinas | NDTF
Cash and Cash Equivalents
Estimated Fair Value	69	51
Equity Securities, FV-NI
Gross Unrealized Holding Gains	3,476	2,886
Gross Unrealized Holding Losses	8	14
Estimated Fair Value	4,729	4,196
Debt Securities, Available-for-sale
Estimated Fair Value	1,707	1,438
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	3,507	2,904
Unrealized Holding Losses	68	99
Estimated Fair Value	6,505	5,685
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,452
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,563	2,081
Unrealized Holding Losses	35	61
Estimated Fair Value	5,050	4,499
Progress Energy | NDTF
Cash and Cash Equivalents
Estimated Fair Value	82	82
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,529	2,056
Gross Unrealized Holding Losses	3	8
Estimated Fair Value	3,495	3,082
Debt Securities, Available-for-sale
Estimated Fair Value	1,428	1,294
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,563	2,081
Unrealized Holding Losses	35	60
Estimated Fair Value	5,005	4,458
Progress Energy | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	21	18
Debt Securities, Available-for-sale
Estimated Fair Value	24	23
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	1
Estimated Fair Value	45	41
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	1,234
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,439	1,979
Unrealized Holding Losses	27	46
Estimated Fair Value	4,672	4,089
Duke Energy Progress | NDTF
Cash and Cash Equivalents
Estimated Fair Value	61	55
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,407	1,956
Gross Unrealized Holding Losses	3	8
Estimated Fair Value	3,361	2,970
Debt Securities, Available-for-sale
Estimated Fair Value	1,234	1,050
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,439	1,979
Unrealized Holding Losses	27	46
Estimated Fair Value	4,656	4,075
Duke Energy Progress | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	16	14
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Estimated Fair Value	16	14
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	218
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	124	102
Unrealized Holding Losses	8	15
Estimated Fair Value	375	409
Duke Energy Florida | NDTF
Cash and Cash Equivalents
Estimated Fair Value	21	27
Equity Securities, FV-NI
Gross Unrealized Holding Gains	122	100
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	134	112
Debt Securities, Available-for-sale
Estimated Fair Value	194	244
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	124	102
Unrealized Holding Losses	8	14
Estimated Fair Value	349	383
Duke Energy Florida | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	2	3
Debt Securities, Available-for-sale
Estimated Fair Value	24	23
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	1
Estimated Fair Value	26	26
Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	66
Duke Energy Indiana | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	2	1
Equity Securities, FV-NI
Gross Unrealized Holding Gains	22	4
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	117	98
Debt Securities, Available-for-sale
Estimated Fair Value	66	64
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	23	5
Unrealized Holding Losses	1	1
Estimated Fair Value	185	163
Corporate debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	20	12
Gross Unrealized Holding Losses	29	43
Estimated Fair Value	721	632
Corporate debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	3	6
Estimated Fair Value	92	82
Corporate debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	9	4
Gross Unrealized Holding Losses	25	35
Estimated Fair Value	458	390
Corporate debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	11	8
Gross Unrealized Holding Losses	4	8
Estimated Fair Value	263	242
Corporate debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	10	7
Gross Unrealized Holding Losses	4	8
Estimated Fair Value	252	229
Corporate debt securities | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	11	13
Corporate debt securities | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	7	8
Municipal bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	6
Gross Unrealized Holding Losses	10	16
Estimated Fair Value	342	347
Municipal bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	1	2
Estimated Fair Value	89	77
Municipal bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	3	4
Estimated Fair Value	42	50
Municipal bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	6
Gross Unrealized Holding Losses	7	12
Estimated Fair Value	300	297
Municipal bonds | Progress Energy | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	1
Estimated Fair Value	24	23
Municipal bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	6
Gross Unrealized Holding Losses	7	12
Estimated Fair Value	300	297
Municipal bonds | Duke Energy Florida | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	1
Estimated Fair Value	24	23
Municipal bonds | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	52	46
U.S. government bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	37	24
Gross Unrealized Holding Losses	46	65
Estimated Fair Value	1,824	1,575
U.S. government bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	2	2
Estimated Fair Value	55	65
U.S. government bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	19	13
Gross Unrealized Holding Losses	25	33
Estimated Fair Value	976	826
U.S. government bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	18	11
Gross Unrealized Holding Losses	21	32
Estimated Fair Value	848	749
U.S. government bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	17	10
Gross Unrealized Holding Losses	13	18
Estimated Fair Value	666	518
U.S. government bonds | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	8	14
Estimated Fair Value	182	231
U.S. government bonds | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	7	10
Other debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	1
Gross Unrealized Holding Losses	7	13
Estimated Fair Value	248	178
Other debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	2	2
Estimated Fair Value	48	47
Other debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	1
Gross Unrealized Holding Losses	7	13
Estimated Fair Value	231	172
Other debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	17	6
Other debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	16	6
Other debt securities | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	$ 1	$ 0

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