Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($)
$ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
$ 3,565
|
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
6,289
|
$ 5,804
|
| Gross Unrealized Holding Losses |
150
|
219
|
| Estimated Fair Value |
12,610
|
11,905
|
| NDTF |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
145
|
139
|
| Equity Securities, FV-NI |
|
|
| Gross Unrealized Holding Gains |
6,210
|
5,753
|
| Gross Unrealized Holding Losses |
36
|
61
|
| Estimated Fair Value |
8,637
|
8,233
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
3,327
|
3,060
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
6,244
|
5,765
|
| Gross Unrealized Holding Losses |
137
|
200
|
| Estimated Fair Value |
12,109
|
11,432
|
| Other Investments |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
138
|
47
|
| Equity Securities, FV-NI |
|
|
| Gross Unrealized Holding Gains |
45
|
39
|
| Gross Unrealized Holding Losses |
0
|
4
|
| Estimated Fair Value |
125
|
160
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
238
|
266
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
45
|
39
|
| Gross Unrealized Holding Losses |
13
|
19
|
| Estimated Fair Value |
501
|
473
|
| Duke Energy Carolinas |
|
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
1,836
|
|
| Duke Energy Carolinas | NDTF |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
60
|
62
|
| Equity Securities, FV-NI |
|
|
| Gross Unrealized Holding Gains |
3,638
|
3,386
|
| Gross Unrealized Holding Losses |
18
|
33
|
| Estimated Fair Value |
4,983
|
4,751
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
1,836
|
1,651
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
3,655
|
3,389
|
| Gross Unrealized Holding Losses |
84
|
122
|
| Estimated Fair Value |
6,879
|
6,464
|
| Progress Energy |
|
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
1,514
|
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
2,589
|
2,376
|
| Gross Unrealized Holding Losses |
54
|
78
|
| Estimated Fair Value |
5,269
|
5,015
|
| Progress Energy | NDTF |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
85
|
77
|
| Equity Securities, FV-NI |
|
|
| Gross Unrealized Holding Gains |
2,572
|
2,367
|
| Gross Unrealized Holding Losses |
18
|
28
|
| Estimated Fair Value |
3,654
|
3,482
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
1,491
|
1,409
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
2,589
|
2,376
|
| Gross Unrealized Holding Losses |
53
|
78
|
| Estimated Fair Value |
5,230
|
4,968
|
| Progress Energy | Other Investments |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
16
|
23
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
23
|
24
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
0
|
0
|
| Gross Unrealized Holding Losses |
1
|
0
|
| Estimated Fair Value |
39
|
47
|
| Duke Energy Progress |
|
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
1,324
|
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
2,473
|
2,265
|
| Gross Unrealized Holding Losses |
48
|
70
|
| Estimated Fair Value |
4,933
|
4,653
|
| Duke Energy Progress | NDTF |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
67
|
54
|
| Equity Securities, FV-NI |
|
|
| Gross Unrealized Holding Gains |
2,457
|
2,256
|
| Gross Unrealized Holding Losses |
18
|
28
|
| Estimated Fair Value |
3,531
|
3,362
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
1,324
|
1,221
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
2,473
|
2,265
|
| Gross Unrealized Holding Losses |
48
|
70
|
| Estimated Fair Value |
4,922
|
4,637
|
| Duke Energy Progress | Other Investments |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
11
|
16
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
0
|
0
|
| Gross Unrealized Holding Losses |
0
|
0
|
| Estimated Fair Value |
11
|
16
|
| Duke Energy Florida |
|
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
190
|
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
116
|
111
|
| Gross Unrealized Holding Losses |
6
|
8
|
| Estimated Fair Value |
333
|
358
|
| Duke Energy Florida | NDTF |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
18
|
23
|
| Equity Securities, FV-NI |
|
|
| Gross Unrealized Holding Gains |
115
|
111
|
| Gross Unrealized Holding Losses |
0
|
0
|
| Estimated Fair Value |
123
|
120
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
167
|
188
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
116
|
111
|
| Gross Unrealized Holding Losses |
5
|
8
|
| Estimated Fair Value |
308
|
331
|
| Duke Energy Florida | Other Investments |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
2
|
3
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
23
|
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 |
26
|
|
| Duke Energy Indiana | Other Investments |
|
|
| Cash and Cash Equivalents |
|
|
| Estimated Fair Value |
2
|
1
|
| Equity Securities, FV-NI |
|
|
| Gross Unrealized Holding Gains |
1
|
|
| Gross Unrealized Holding Losses |
0
|
4
|
| Estimated Fair Value |
47
|
89
|
| Debt Securities, Available-for-sale |
|
|
| Estimated Fair Value |
26
|
56
|
| Investments, Accumulated Gross Unrealized Gains (Losses) [Abstract] |
|
|
| Gross Unrealized Holding Gains |
1
|
|
| Gross Unrealized Holding Losses |
1
|
5
|
| Estimated Fair Value |
75
|
146
|
| Corporate debt securities | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
14
|
6
|
| Gross Unrealized Holding Losses |
24
|
33
|
| Estimated Fair Value |
822
|
673
|
| Corporate debt securities | Other Investments |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
0
|
0
|
| Gross Unrealized Holding Losses |
3
|
5
|
| Estimated Fair Value |
77
|
79
|
| Corporate debt securities | Duke Energy Carolinas | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
6
|
2
|
| Gross Unrealized Holding Losses |
21
|
27
|
| Estimated Fair Value |
501
|
401
|
| Corporate debt securities | Progress Energy | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
8
|
4
|
| Gross Unrealized Holding Losses |
3
|
6
|
| Estimated Fair Value |
321
|
272
|
| Corporate debt securities | Duke Energy Progress | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
7
|
4
|
| Gross Unrealized Holding Losses |
3
|
6
|
| Estimated Fair Value |
302
|
256
|
| Corporate debt securities | Duke Energy Florida | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
1
|
0
|
| Gross Unrealized Holding Losses |
0
|
0
|
| Estimated Fair Value |
19
|
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 |
1
|
2
|
| Gross Unrealized Holding Losses |
20
|
14
|
| Estimated Fair Value |
355
|
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 |
67
|
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 |
38
|
36
|
| Municipal bonds | Progress Energy | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
1
|
2
|
| Gross Unrealized Holding Losses |
14
|
10
|
| Estimated Fair Value |
317
|
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 |
23
|
24
|
| Municipal bonds | Duke Energy Progress | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
1
|
2
|
| Gross Unrealized Holding Losses |
14
|
10
|
| Estimated Fair Value |
317
|
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 |
23
|
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 |
25
|
43
|
| U.S. government bonds | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
17
|
3
|
| Gross Unrealized Holding Losses |
51
|
84
|
| Estimated Fair Value |
1,897
|
1,806
|
| U.S. government bonds | Other Investments |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
0
|
0
|
| Gross Unrealized Holding Losses |
5
|
5
|
| Estimated Fair Value |
51
|
59
|
| U.S. government bonds | Duke Energy Carolinas | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
9
|
0
|
| Gross Unrealized Holding Losses |
33
|
50
|
| Estimated Fair Value |
1,056
|
991
|
| U.S. government bonds | Progress Energy | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
8
|
3
|
| Gross Unrealized Holding Losses |
18
|
34
|
| Estimated Fair Value |
841
|
815
|
| U.S. government bonds | Duke Energy Progress | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
8
|
3
|
| Gross Unrealized Holding Losses |
13
|
26
|
| Estimated Fair Value |
694
|
645
|
| U.S. government bonds | Duke Energy Florida | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
0
|
0
|
| Gross Unrealized Holding Losses |
5
|
8
|
| Estimated Fair Value |
147
|
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 |
0
|
7
|
| Other debt securities | NDTF |
|
|
| Debt Securities, Available-for-sale |
|
|
| Gross Unrealized Holding Gains |
2
|
1
|
| Gross Unrealized Holding Losses |
6
|
8
|
| Estimated Fair Value |
253
|
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 |
6
|
8
|
| Estimated Fair Value |
241
|
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 |
12
|
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 |
11
|
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
|