Fair Value Measurements (Fair Value Measurement Amounts for Assets and Liabilities) (Details) - USD ($)
$ in Millions |
Mar. 31, 2026 |
Dec. 31, 2025 |
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
$ 5,418
|
|
| Derivative assets |
327
|
$ 382
|
| Total assets |
13,578
|
13,707
|
| Derivative liabilities |
(283)
|
(244)
|
| Net assets (liabilities) |
13,295
|
13,463
|
| NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
200
|
175
|
| Equity securities |
7,269
|
8,519
|
| Debt securities |
5,171
|
4,193
|
| NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
7,269
|
8,519
|
| Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
229
|
53
|
| Equity securities |
135
|
139
|
| Debt securities |
247
|
246
|
| Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
3
|
2
|
| Total assets |
9,847
|
10,398
|
| Derivative liabilities |
(10)
|
(7)
|
| Net assets (liabilities) |
9,837
|
10,391
|
| Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
200
|
175
|
| Debt securities |
1,986
|
1,480
|
| Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
7,244
|
8,494
|
| Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
229
|
53
|
| Equity securities |
135
|
139
|
| Debt securities |
50
|
55
|
| Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
320
|
371
|
| Total assets |
3,704
|
3,278
|
| Derivative liabilities |
(273)
|
(237)
|
| Net assets (liabilities) |
3,431
|
3,041
|
| Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
3,185
|
2,713
|
| Level 2 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
2
|
3
|
| 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 |
197
|
191
|
| Level 3 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
4
|
9
|
| Total assets |
4
|
9
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
4
|
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 |
23
|
22
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
23
|
22
|
| 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 |
23
|
22
|
| 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 |
2,939
|
|
| Derivative assets |
99
|
101
|
| Total assets |
7,311
|
7,438
|
| Derivative liabilities |
(102)
|
(88)
|
| Net assets (liabilities) |
7,209
|
7,350
|
| Duke Energy Carolinas | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
98
|
92
|
| Equity securities |
4,175
|
4,896
|
| Debt securities |
2,939
|
2,349
|
| Duke Energy Carolinas | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
4,175
|
4,896
|
| Duke Energy Carolinas | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
5,326
|
5,739
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
5,326
|
5,739
|
| Duke Energy Carolinas | Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
98
|
92
|
| Debt securities |
1,078
|
776
|
| Duke Energy Carolinas | Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
4,150
|
4,871
|
| Duke Energy Carolinas | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
99
|
101
|
| Total assets |
1,962
|
1,677
|
| Derivative liabilities |
(102)
|
(88)
|
| Net assets (liabilities) |
1,860
|
1,589
|
| Duke Energy Carolinas | Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
1,861
|
1,573
|
| Duke Energy Carolinas | Level 2 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
2
|
3
|
| Duke Energy Carolinas | Not Categorized |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
23
|
22
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
23
|
22
|
| 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 |
23
|
22
|
| Progress Energy |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
2,257
|
|
| Derivative assets |
66
|
67
|
| Total assets |
5,549
|
5,675
|
| Derivative liabilities |
(73)
|
(48)
|
| Net assets (liabilities) |
5,476
|
5,627
|
| Progress Energy | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
102
|
83
|
| Equity securities |
3,094
|
3,623
|
| Debt securities |
2,232
|
1,844
|
| Progress Energy | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
3,094
|
3,623
|
| Progress Energy | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
30
|
34
|
| Debt securities |
25
|
24
|
| Progress Energy | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
4,134
|
4,444
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
4,134
|
4,444
|
| Progress Energy | Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
102
|
83
|
| Debt securities |
908
|
704
|
| Progress Energy | Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
3,094
|
3,623
|
| Progress Energy | Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
30
|
34
|
| Debt securities |
0
|
0
|
| Progress Energy | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
66
|
67
|
| Total assets |
1,415
|
1,231
|
| Derivative liabilities |
(73)
|
(48)
|
| Net assets (liabilities) |
1,342
|
1,183
|
| Progress Energy | Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
1,324
|
1,140
|
| 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 |
25
|
24
|
| Duke Energy Progress |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
2,105
|
|
| Derivative assets |
45
|
52
|
| Total assets |
5,220
|
5,330
|
| Derivative liabilities |
(70)
|
(47)
|
| Net assets (liabilities) |
5,150
|
5,283
|
| Duke Energy Progress | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
86
|
71
|
| Equity securities |
2,962
|
3,485
|
| Debt securities |
2,105
|
1,698
|
| Duke Energy Progress | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
2,962
|
3,485
|
| Duke Energy Progress | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
22
|
24
|
| Duke Energy Progress | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
3,890
|
4,177
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
3,890
|
4,177
|
| Duke Energy Progress | Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
86
|
71
|
| Debt securities |
820
|
597
|
| Duke Energy Progress | Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
2,962
|
3,485
|
| Duke Energy Progress | Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
22
|
24
|
| Duke Energy Progress | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
45
|
52
|
| Total assets |
1,330
|
1,153
|
| Derivative liabilities |
(70)
|
(47)
|
| Net assets (liabilities) |
1,260
|
1,106
|
| Duke Energy Progress | Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
1,285
|
1,101
|
| 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 |
152
|
|
| Derivative assets |
21
|
15
|
| Total assets |
325
|
340
|
| Derivative liabilities |
(3)
|
(1)
|
| Net assets (liabilities) |
322
|
339
|
| Duke Energy Florida | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
16
|
12
|
| Equity securities |
132
|
138
|
| Debt securities |
127
|
146
|
| Duke Energy Florida | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
132
|
138
|
| Duke Energy Florida | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
4
|
5
|
| Debt securities |
25
|
24
|
| Duke Energy Florida | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
0
|
0
|
| Total assets |
240
|
262
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
240
|
262
|
| Duke Energy Florida | Level 1 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
16
|
12
|
| Debt securities |
88
|
107
|
| Duke Energy Florida | Level 1 | NDTF equity securities |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Equity securities |
132
|
138
|
| Duke Energy Florida | Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
4
|
5
|
| Debt securities |
0
|
0
|
| Duke Energy Florida | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
21
|
15
|
| Total assets |
85
|
78
|
| Derivative liabilities |
(3)
|
(1)
|
| Net assets (liabilities) |
82
|
77
|
| Duke Energy Florida | Level 2 | NDTF |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
0
|
0
|
| Debt securities |
39
|
39
|
| 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 |
25
|
24
|
| Duke Energy Indiana |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Debt securities |
29
|
|
| Derivative assets |
9
|
12
|
| Total assets |
90
|
94
|
| Derivative liabilities |
(10)
|
(9)
|
| Net assets (liabilities) |
80
|
85
|
| Duke Energy Indiana | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
1
|
0
|
| Equity securities |
51
|
53
|
| Debt securities |
29
|
29
|
| Duke Energy Indiana | Level 1 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
3
|
2
|
| Total assets |
55
|
55
|
| Derivative liabilities |
(10)
|
(7)
|
| Net assets (liabilities) |
45
|
48
|
| Duke Energy Indiana | Level 1 | Other Investments |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Cash and cash equivalents |
1
|
0
|
| Equity securities |
51
|
53
|
| Debt securities |
0
|
0
|
| Duke Energy Indiana | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
2
|
1
|
| Total assets |
31
|
30
|
| Derivative liabilities |
0
|
(2)
|
| Net assets (liabilities) |
31
|
28
|
| 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 |
29
|
29
|
| Duke Energy Indiana | Level 3 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative assets |
4
|
9
|
| Total assets |
4
|
9
|
| Derivative liabilities |
0
|
0
|
| Net assets (liabilities) |
4
|
9
|
| 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 liabilities |
(68)
|
(72)
|
| Piedmont | Level 2 |
|
|
| Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |
|
|
| Derivative liabilities |
$ (68)
|
$ (72)
|