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Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale
Estimated Fair Value	$ 3,202
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	5,680	$ 5,019
Unrealized Holding Losses	187	171
Estimated Fair Value	11,513	10,603
NDTF
Cash and Cash Equivalents
Estimated Fair Value	151	133
Equity Securities, FV-NI
Gross Unrealized Holding Gains	5,612	4,942
Gross Unrealized Holding Losses	23	22
Estimated Fair Value	7,859	7,278
Debt Securities, Available-for-sale
Estimated Fair Value	2,933	2,732
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	5,629	4,985
Unrealized Holding Losses	171	159
Estimated Fair Value	10,943	10,143
Other Investments
Cash and Cash Equivalents
Estimated Fair Value	124	31
Equity Securities, FV-NI
Gross Unrealized Holding Gains	51	33
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	177	158
Debt Securities, Available-for-sale
Estimated Fair Value	269	271
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	51	34
Unrealized Holding Losses	16	12
Estimated Fair Value	570	460
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	1,584
Duke Energy Carolinas | NDTF
Cash and Cash Equivalents
Estimated Fair Value	57	51
Equity Securities, FV-NI
Gross Unrealized Holding Gains	3,254	2,886
Gross Unrealized Holding Losses	16	14
Estimated Fair Value	4,527	4,196
Debt Securities, Available-for-sale
Estimated Fair Value	1,584	1,438
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	3,259	2,904
Unrealized Holding Losses	111	99
Estimated Fair Value	6,168	5,685
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,372
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,370	2,081
Unrealized Holding Losses	61	61
Estimated Fair Value	4,823	4,499
Progress Energy | NDTF
Cash and Cash Equivalents
Estimated Fair Value	94	82
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,358	2,056
Gross Unrealized Holding Losses	7	8
Estimated Fair Value	3,332	3,082
Debt Securities, Available-for-sale
Estimated Fair Value	1,349	1,294
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,370	2,081
Unrealized Holding Losses	60	60
Estimated Fair Value	4,775	4,458
Progress Energy | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	25	18
Debt Securities, Available-for-sale
Estimated Fair Value	23	23
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	1	1
Estimated Fair Value	48	41
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	1,143
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,254	1,979
Unrealized Holding Losses	48	46
Estimated Fair Value	4,443	4,089
Duke Energy Progress | NDTF
Cash and Cash Equivalents
Estimated Fair Value	77	55
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,243	1,956
Gross Unrealized Holding Losses	7	8
Estimated Fair Value	3,205	2,970
Debt Securities, Available-for-sale
Estimated Fair Value	1,143	1,050
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,254	1,979
Unrealized Holding Losses	48	46
Estimated Fair Value	4,425	4,075
Duke Energy Progress | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	18	14
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Estimated Fair Value	18	14
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	229
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	116	102
Unrealized Holding Losses	13	15
Estimated Fair Value	376	409
Duke Energy Florida | NDTF
Cash and Cash Equivalents
Estimated Fair Value	17	27
Equity Securities, FV-NI
Gross Unrealized Holding Gains	115	100
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	127	112
Debt Securities, Available-for-sale
Estimated Fair Value	206	244
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	116	102
Unrealized Holding Losses	12	14
Estimated Fair Value	350	383
Duke Energy Florida | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	3	3
Debt Securities, Available-for-sale
Estimated Fair Value	23	23
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	1	1
Estimated Fair Value	26	26
Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	62
Duke Energy Indiana | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	2	1
Equity Securities, FV-NI
Gross Unrealized Holding Gains	15	4
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	110	98
Debt Securities, Available-for-sale
Estimated Fair Value	62	64
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	15	5
Unrealized Holding Losses	1	1
Estimated Fair Value	174	163
Corporate debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	7	12
Gross Unrealized Holding Losses	44	43
Estimated Fair Value	691	632
Corporate debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	6	6
Estimated Fair Value	91	82
Corporate debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	4
Gross Unrealized Holding Losses	37	35
Estimated Fair Value	424	390
Corporate debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	8
Gross Unrealized Holding Losses	7	8
Estimated Fair Value	267	242
Corporate debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	7
Gross Unrealized Holding Losses	7	8
Estimated Fair Value	254	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	13	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	3	6
Gross Unrealized Holding Losses	15	16
Estimated Fair Value	330	347
Municipal bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	2	2
Estimated Fair Value	81	77
Municipal bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	4	4
Estimated Fair Value	41	50
Municipal bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	6
Gross Unrealized Holding Losses	11	12
Estimated Fair Value	289	297
Municipal bonds | Progress Energy | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	23	23
Municipal bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	6
Gross Unrealized Holding Losses	11	12
Estimated Fair Value	289	297
Municipal bonds | Duke Energy Florida | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	23	23
Municipal bonds | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	47	46
U.S. government bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	6	24
Gross Unrealized Holding Losses	79	65
Estimated Fair Value	1,668	1,575
U.S. government bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	4	2
Estimated Fair Value	50	65
U.S. government bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	13
Gross Unrealized Holding Losses	44	33
Estimated Fair Value	894	826
U.S. government bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	11
Gross Unrealized Holding Losses	35	32
Estimated Fair Value	774	749
U.S. government bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	10
Gross Unrealized Holding Losses	23	18
Estimated Fair Value	583	518
U.S. government bonds | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	1
Gross Unrealized Holding Losses	12	14
Estimated Fair Value	191	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	8	10
Other debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	10	13
Estimated Fair Value	244	178
Other debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	4	2
Estimated Fair Value	47	47
Other debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	1
Gross Unrealized Holding Losses	10	13
Estimated Fair Value	225	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	19	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	17	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	$ 2	$ 0

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