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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, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale
Estimated Fair Value	$ 4,414
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	6,052	$ 5,804
Gross Unrealized Holding Losses	109	219
Estimated Fair Value	13,231	11,905
NDTF
Cash and Cash Equivalents
Estimated Fair Value	172	139
Equity Securities, FV-NI
Gross Unrealized Holding Gains	5,938	5,753
Gross Unrealized Holding Losses	17	61
Estimated Fair Value	8,435	8,233
Debt Securities, Available-for-sale
Estimated Fair Value	4,170	3,060
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	5,998	5,765
Gross Unrealized Holding Losses	99	200
Estimated Fair Value	12,777	11,432
Other Investments
Cash and Cash Equivalents
Estimated Fair Value	76	47
Equity Securities, FV-NI
Gross Unrealized Holding Gains	54	39
Gross Unrealized Holding Losses	0	4
Estimated Fair Value	134	160
Debt Securities, Available-for-sale
Estimated Fair Value	244	266
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	54	39
Gross Unrealized Holding Losses	10	19
Estimated Fair Value	454	473
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	2,329
Duke Energy Carolinas | NDTF
Cash and Cash Equivalents
Estimated Fair Value	84	62
Equity Securities, FV-NI
Gross Unrealized Holding Gains	3,483	3,386
Gross Unrealized Holding Losses	11	33
Estimated Fair Value	4,856	4,751
Debt Securities, Available-for-sale
Estimated Fair Value	2,329	1,651
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	3,514	3,389
Gross Unrealized Holding Losses	65	122
Estimated Fair Value	7,269	6,464
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,865
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	2,484	2,376
Gross Unrealized Holding Losses	35	78
Estimated Fair Value	5,546	5,015
Progress Energy | NDTF
Cash and Cash Equivalents
Estimated Fair Value	88	77
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,455	2,367
Gross Unrealized Holding Losses	6	28
Estimated Fair Value	3,579	3,482
Debt Securities, Available-for-sale
Estimated Fair Value	1,841	1,409
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	2,484	2,376
Gross Unrealized Holding Losses	34	78
Estimated Fair Value	5,508	4,968
Progress Energy | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	14	23
Debt Securities, Available-for-sale
Estimated Fair Value	24	24
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	1	0
Estimated Fair Value	38	47
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	1,685
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	2,358	2,265
Gross Unrealized Holding Losses	30	70
Estimated Fair Value	5,211	4,653
Duke Energy Progress | NDTF
Cash and Cash Equivalents
Estimated Fair Value	72	54
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,330	2,256
Gross Unrealized Holding Losses	6	28
Estimated Fair Value	3,445	3,362
Debt Securities, Available-for-sale
Estimated Fair Value	1,685	1,221
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	2,358	2,265
Gross Unrealized Holding Losses	30	70
Estimated Fair Value	5,202	4,637
Duke Energy Progress | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	9	16
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	9	16
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	180
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	126	111
Gross Unrealized Holding Losses	5	8
Estimated Fair Value	331	358
Duke Energy Florida | NDTF
Cash and Cash Equivalents
Estimated Fair Value	16	23
Equity Securities, FV-NI
Gross Unrealized Holding Gains	125	111
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	134	120
Debt Securities, Available-for-sale
Estimated Fair Value	156	188
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	126	111
Gross Unrealized Holding Losses	4	8
Estimated Fair Value	306	331
Duke Energy Florida | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	1	3
Debt Securities, Available-for-sale
Estimated Fair Value	24	24
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	1	0
Estimated Fair Value	25	27
Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	28
Duke Energy Indiana | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	1	1
Equity Securities, FV-NI
Gross Unrealized Holding Gains	5
Gross Unrealized Holding Losses	0	4
Estimated Fair Value	51	89
Debt Securities, Available-for-sale
Estimated Fair Value	28	56
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Gross Unrealized Holding Gains	5
Gross Unrealized Holding Losses	1	5
Estimated Fair Value	80	146
Corporate debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	21	6
Gross Unrealized Holding Losses	19	33
Estimated Fair Value	1,021	673
Corporate debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	2	5
Estimated Fair Value	70	79
Corporate debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	11	2
Gross Unrealized Holding Losses	16	27
Estimated Fair Value	637	401
Corporate debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	10	4
Gross Unrealized Holding Losses	3	6
Estimated Fair Value	384	272
Corporate debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	10	4
Gross Unrealized Holding Losses	3	6
Estimated Fair Value	367	256
Corporate 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	17	16
Corporate debt securities | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	1	6
Municipal bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	2
Gross Unrealized Holding Losses	15	14
Estimated Fair Value	374	342
Municipal bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	2	1
Estimated Fair Value	69	83
Municipal bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	5	4
Estimated Fair Value	50	36
Municipal bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	2
Gross Unrealized Holding Losses	10	10
Estimated Fair Value	324	306
Municipal bonds | Progress Energy | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	1	0
Estimated Fair Value	24	24
Municipal bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	4	2
Gross Unrealized Holding Losses	10	10
Estimated Fair Value	324	306
Municipal bonds | Duke Energy Florida | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	1	0
Estimated Fair Value	24	24
Municipal bonds | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	24	43
U.S. government bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	32	3
Gross Unrealized Holding Losses	43	84
Estimated Fair Value	2,488	1,806
U.S. government bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	4	5
Estimated Fair Value	56	59
U.S. government bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	17	0
Gross Unrealized Holding Losses	28	50
Estimated Fair Value	1,397	991
U.S. government bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	15	3
Gross Unrealized Holding Losses	15	34
Estimated Fair Value	1,091	815
U.S. government bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	14	3
Gross Unrealized Holding Losses	11	26
Estimated Fair Value	953	645
U.S. government bonds | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	0
Gross Unrealized Holding Losses	4	8
Estimated Fair Value	138	170
U.S. government bonds | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	3	7
Other debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	1
Gross Unrealized Holding Losses	5	8
Estimated Fair Value	287	239
Other debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	2	4
Estimated Fair Value	49	45
Other debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	1
Gross Unrealized Holding Losses	5	8
Estimated Fair Value	245	223
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	42	16
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	41	14
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	$ 2

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