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Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($) $ in Millions	Mar. 31, 2025	Dec. 31, 2024
Debt Securities, Available-for-sale
Estimated Fair Value	$ 3,528
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	5,492	$ 5,804
Unrealized Holding Losses	209	219
Estimated Fair Value	11,792	11,905
NDTF
Cash and Cash Equivalents
Estimated Fair Value	128	139
Equity Securities, FV-NI
Gross Unrealized Holding Gains	5,430	5,753
Gross Unrealized Holding Losses	85	61
Estimated Fair Value	7,828	8,233
Debt Securities, Available-for-sale
Estimated Fair Value	3,288	3,060
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	5,456	5,765
Unrealized Holding Losses	194	200
Estimated Fair Value	11,244	11,432
Other Investments
Cash and Cash Equivalents
Estimated Fair Value	195	47
Equity Securities, FV-NI
Gross Unrealized Holding Gains	36	39
Gross Unrealized Holding Losses	3	4
Estimated Fair Value	113	160
Debt Securities, Available-for-sale
Estimated Fair Value	240	266
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	36	39
Unrealized Holding Losses	15	19
Estimated Fair Value	548	473
Duke Energy Carolinas
Debt Securities, Available-for-sale
Estimated Fair Value	1,811
Duke Energy Carolinas | NDTF
Cash and Cash Equivalents
Estimated Fair Value	53	62
Equity Securities, FV-NI
Gross Unrealized Holding Gains	3,185	3,386
Gross Unrealized Holding Losses	40	33
Estimated Fair Value	4,512	4,751
Debt Securities, Available-for-sale
Estimated Fair Value	1,811	1,651
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	3,198	3,389
Unrealized Holding Losses	109	122
Estimated Fair Value	6,376	6,464
Progress Energy
Debt Securities, Available-for-sale
Estimated Fair Value	1,501
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,258	2,376
Unrealized Holding Losses	85	78
Estimated Fair Value	4,913	5,015
Progress Energy | NDTF
Cash and Cash Equivalents
Estimated Fair Value	75	77
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,245	2,367
Gross Unrealized Holding Losses	45	28
Estimated Fair Value	3,316	3,482
Debt Securities, Available-for-sale
Estimated Fair Value	1,477	1,409
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,258	2,376
Unrealized Holding Losses	85	78
Estimated Fair Value	4,868	4,968
Progress Energy | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	21	23
Debt Securities, Available-for-sale
Estimated Fair Value	24	24
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Estimated Fair Value	45	47
Duke Energy Progress
Debt Securities, Available-for-sale
Estimated Fair Value	1,300
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,152	2,265
Unrealized Holding Losses	79	70
Estimated Fair Value	4,577	4,653
Duke Energy Progress | NDTF
Cash and Cash Equivalents
Estimated Fair Value	62	54
Equity Securities, FV-NI
Gross Unrealized Holding Gains	2,139	2,256
Gross Unrealized Holding Losses	45	28
Estimated Fair Value	3,201	3,362
Debt Securities, Available-for-sale
Estimated Fair Value	1,300	1,221
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	2,152	2,265
Unrealized Holding Losses	79	70
Estimated Fair Value	4,563	4,637
Duke Energy Progress | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	14	16
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Estimated Fair Value	14	16
Duke Energy Florida
Debt Securities, Available-for-sale
Estimated Fair Value	201
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	106	111
Unrealized Holding Losses	6	8
Estimated Fair Value	332	358
Duke Energy Florida | NDTF
Cash and Cash Equivalents
Estimated Fair Value	13	23
Equity Securities, FV-NI
Gross Unrealized Holding Gains	106	111
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	115	120
Debt Securities, Available-for-sale
Estimated Fair Value	177	188
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	106	111
Unrealized Holding Losses	6	8
Estimated Fair Value	305	331
Duke Energy Florida | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	3	3
Debt Securities, Available-for-sale
Estimated Fair Value	24	24
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	0	0
Estimated Fair Value	27	27
Duke Energy Indiana
Debt Securities, Available-for-sale
Estimated Fair Value	26
Duke Energy Indiana | Other Investments
Cash and Cash Equivalents
Estimated Fair Value	2	1
Equity Securities, FV-NI
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	3	4
Estimated Fair Value	43	89
Debt Securities, Available-for-sale
Estimated Fair Value	26	56
Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract]
Unrealized Holding Gains	0	0
Unrealized Holding Losses	4	5
Estimated Fair Value	71	146
Corporate debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	8	6
Gross Unrealized Holding Losses	29	33
Estimated Fair Value	793	673
Corporate debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	4	5
Estimated Fair Value	77	79
Corporate debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	3	2
Gross Unrealized Holding Losses	24	27
Estimated Fair Value	494	401
Corporate debt securities | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	4
Gross Unrealized Holding Losses	5	6
Estimated Fair Value	299	272
Corporate debt securities | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	5	4
Gross Unrealized Holding Losses	5	6
Estimated Fair Value	283	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	16	16
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	1	6
Municipal bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	2
Gross Unrealized Holding Losses	18	14
Estimated Fair Value	341	342
Municipal bonds | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	63	83
Municipal bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	6	4
Estimated Fair Value	34	36
Municipal bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	2
Gross Unrealized Holding Losses	12	10
Estimated Fair Value	307	306
Municipal bonds | Progress Energy | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	24	24
Municipal bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	1	2
Gross Unrealized Holding Losses	12	10
Estimated Fair Value	307	306
Municipal bonds | Duke Energy Florida | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	0	0
Estimated Fair Value	24	24
Municipal bonds | Duke Energy Indiana | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	1	1
Estimated Fair Value	23	43
U.S. government bonds | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	15	3
Gross Unrealized Holding Losses	55	84
Estimated Fair Value	1,904	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	57	59
U.S. government bonds | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	8	0
Gross Unrealized Holding Losses	32	50
Estimated Fair Value	1,049	991
U.S. government bonds | Progress Energy | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	7	3
Gross Unrealized Holding Losses	23	34
Estimated Fair Value	855	815
U.S. government bonds | Duke Energy Progress | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	7	3
Gross Unrealized Holding Losses	17	26
Estimated Fair Value	696	645
U.S. government bonds | Duke Energy Florida | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	6	8
Estimated Fair Value	159	170
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	2	7
Other debt securities | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	1
Gross Unrealized Holding Losses	7	8
Estimated Fair Value	250	239
Other debt securities | Other Investments
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	0	0
Gross Unrealized Holding Losses	3	4
Estimated Fair Value	43	45
Other debt securities | Duke Energy Carolinas | NDTF
Debt Securities, Available-for-sale
Gross Unrealized Holding Gains	2	1
Gross Unrealized Holding Losses	7	8
Estimated Fair Value	234	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	16	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	14	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	$ 2	$ 2

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