Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($)
$ in Millions |
Jun. 30, 2025 |
Dec. 31, 2024 |
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
$ 3,565
|
|
| Derivative assets |
539
|
$ 434
|
| Total assets |
13,149
|
12,339
|
| Derivative liabilities |
(256)
|
(319)
|
| Net assets (liabilities) |
12,893
|
12,020
|
| NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
145
|
139
|
| Equity securities |
8,637
|
8,233
|
| Debt securities |
3,327
|
3,060
|
| NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
8,637
|
8,233
|
| Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
138
|
47
|
| Equity securities |
125
|
160
|
| Debt securities |
238
|
266
|
| Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
8
|
2
|
| Total assets |
10,127
|
9,625
|
| Derivative liabilities |
(2)
|
(3)
|
| Net assets (liabilities) |
10,125
|
9,622
|
| Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
145
|
139
|
| Debt securities |
1,051
|
1,022
|
| Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
8,609
|
8,203
|
| Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
138
|
47
|
| Equity securities |
125
|
160
|
| Debt securities |
51
|
52
|
| Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
517
|
423
|
| Total assets |
2,983
|
2,677
|
| Derivative liabilities |
(254)
|
(316)
|
| Net assets (liabilities) |
2,729
|
2,361
|
| Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
2,276
|
2,038
|
| Level 2 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
3
|
2
|
| Level 2 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Equity securities |
0
|
0
|
| Debt securities |
187
|
214
|
| Level 3 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
14
|
9
|
| Total assets |
14
|
9
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
14
|
9
|
| Level 3 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
0
|
0
|
| Level 3 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
0
|
0
|
| Level 3 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Equity securities |
0
|
0
|
| Debt securities |
0
|
0
|
| Not Categorized |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
25
|
28
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
25
|
28
|
| Not Categorized | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
0
|
0
|
| Not Categorized | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
25
|
28
|
| Not Categorized | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Equity securities |
0
|
0
|
| Debt securities |
0
|
0
|
| Duke Energy Carolinas |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
1,836
|
|
| Derivative assets |
110
|
94
|
| Total assets |
6,989
|
6,558
|
| Derivative liabilities |
(60)
|
(88)
|
| Net assets (liabilities) |
6,929
|
6,470
|
| Duke Energy Carolinas | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
60
|
62
|
| Equity securities |
4,983
|
4,751
|
| Debt securities |
1,836
|
1,651
|
| Duke Energy Carolinas | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
4,983
|
4,751
|
| Duke Energy Carolinas | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
5,532
|
5,303
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
5,532
|
5,303
|
| Duke Energy Carolinas | Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
60
|
62
|
| Debt securities |
517
|
520
|
| Duke Energy Carolinas | Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
4,955
|
4,721
|
| Duke Energy Carolinas | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
110
|
94
|
| Total assets |
1,432
|
1,227
|
| Derivative liabilities |
(60)
|
(88)
|
| Net assets (liabilities) |
1,372
|
1,139
|
| Duke Energy Carolinas | Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
1,319
|
1,131
|
| Duke Energy Carolinas | Level 2 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
3
|
2
|
| Duke Energy Carolinas | Not Categorized |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
25
|
28
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
25
|
28
|
| Duke Energy Carolinas | Not Categorized | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
0
|
0
|
| Duke Energy Carolinas | Not Categorized | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
25
|
28
|
| Progress Energy |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
1,514
|
|
| Derivative assets |
102
|
127
|
| Total assets |
5,371
|
5,142
|
| Derivative liabilities |
(41)
|
(58)
|
| Net assets (liabilities) |
5,330
|
5,084
|
| Progress Energy | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
85
|
77
|
| Equity securities |
3,654
|
3,482
|
| Debt securities |
1,491
|
1,409
|
| Progress Energy | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
3,654
|
3,482
|
| Progress Energy | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
16
|
23
|
| Debt securities |
23
|
24
|
| Progress Energy | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
4,289
|
4,084
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
4,289
|
4,084
|
| Progress Energy | Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
85
|
77
|
| Debt securities |
534
|
502
|
| Progress Energy | Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
3,654
|
3,482
|
| Progress Energy | Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
16
|
23
|
| Debt securities |
0
|
0
|
| Progress Energy | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
102
|
127
|
| Total assets |
1,082
|
1,058
|
| Derivative liabilities |
(41)
|
(58)
|
| Net assets (liabilities) |
1,041
|
1,000
|
| Progress Energy | Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
957
|
907
|
| Progress Energy | Level 2 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
0
|
0
|
| Progress Energy | Level 2 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
23
|
24
|
| Duke Energy Progress |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
1,324
|
|
| Derivative assets |
91
|
109
|
| Total assets |
5,024
|
4,762
|
| Derivative liabilities |
(25)
|
(57)
|
| Net assets (liabilities) |
4,999
|
4,705
|
| Duke Energy Progress | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
67
|
54
|
| Equity securities |
3,531
|
3,362
|
| Debt securities |
1,324
|
1,221
|
| Duke Energy Progress | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
3,531
|
3,362
|
| Duke Energy Progress | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
11
|
16
|
| Duke Energy Progress | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
4,022
|
3,797
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
4,022
|
3,797
|
| Duke Energy Progress | Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
67
|
54
|
| Debt securities |
413
|
365
|
| Duke Energy Progress | Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
3,531
|
3,362
|
| Duke Energy Progress | Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
11
|
16
|
| Duke Energy Progress | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
91
|
109
|
| Total assets |
1,002
|
965
|
| Derivative liabilities |
(25)
|
(57)
|
| Net assets (liabilities) |
977
|
908
|
| Duke Energy Progress | Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
911
|
856
|
| Duke Energy Progress | Level 2 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
0
|
0
|
| Duke Energy Progress | Level 2 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Duke Energy Florida |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
190
|
|
| Derivative assets |
10
|
18
|
| Total assets |
343
|
376
|
| Derivative liabilities |
(16)
|
(1)
|
| Net assets (liabilities) |
327
|
375
|
| Duke Energy Florida | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
18
|
23
|
| Equity securities |
123
|
120
|
| Debt securities |
167
|
188
|
| Duke Energy Florida | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
123
|
120
|
| Duke Energy Florida | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
2
|
3
|
| Debt securities |
23
|
24
|
| Duke Energy Florida | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
264
|
283
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
264
|
283
|
| Duke Energy Florida | Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
18
|
23
|
| Debt securities |
121
|
137
|
| Duke Energy Florida | Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
123
|
120
|
| Duke Energy Florida | Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
2
|
3
|
| Debt securities |
0
|
0
|
| Duke Energy Florida | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
10
|
18
|
| Total assets |
79
|
93
|
| Derivative liabilities |
(16)
|
(1)
|
| Net assets (liabilities) |
63
|
92
|
| Duke Energy Florida | Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
46
|
51
|
| Duke Energy Florida | Level 2 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
0
|
0
|
| Duke Energy Florida | Level 2 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
23
|
24
|
| Duke Energy Indiana |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
26
|
|
| Derivative assets |
21
|
44
|
| Total assets |
96
|
190
|
| Derivative liabilities |
(7)
|
(3)
|
| Net assets (liabilities) |
89
|
187
|
| Duke Energy Indiana | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
2
|
1
|
| Equity securities |
47
|
89
|
| Debt securities |
26
|
56
|
| Duke Energy Indiana | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
8
|
0
|
| Total assets |
57
|
90
|
| Derivative liabilities |
(2)
|
(3)
|
| Net assets (liabilities) |
55
|
87
|
| Duke Energy Indiana | Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
2
|
1
|
| Equity securities |
47
|
89
|
| Debt securities |
0
|
0
|
| Duke Energy Indiana | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
36
|
| Total assets |
26
|
92
|
| Derivative liabilities |
(5)
|
0
|
| Net assets (liabilities) |
21
|
92
|
| Duke Energy Indiana | Level 2 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Equity securities |
0
|
0
|
| Debt securities |
26
|
56
|
| Duke Energy Indiana | Level 3 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
13
|
8
|
| Total assets |
13
|
8
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
13
|
8
|
| Duke Energy Indiana | Level 3 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Equity securities |
0
|
0
|
| Debt securities |
0
|
0
|
| Piedmont |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
1
|
| Derivative liabilities |
(115)
|
(94)
|
| Net assets (liabilities) |
(115)
|
(93)
|
| Piedmont | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
|
1
|
| Derivative liabilities |
|
0
|
| Net assets (liabilities) |
|
1
|
| Piedmont | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Derivative liabilities |
(115)
|
(94)
|
| Net assets (liabilities) |
$ (115)
|
$ (94)
|