Investments in Debt and Equity Securities (Realized Gains and Losses) (Details) - USD ($) $ in Millions |
3 Months Ended | |
|---|---|---|
Mar. 31, 2026 |
Mar. 31, 2025 |
|
| FV-NI: | ||
| Realized gains | $ 802 | $ 126 |
| Realized losses | 124 | 41 |
| AFS: | ||
| Realized gains | 17 | 10 |
| Realized losses | 16 | 20 |
| Duke Energy Carolinas | ||
| FV-NI: | ||
| Realized gains | 448 | 82 |
| Realized losses | 74 | 22 |
| AFS: | ||
| Realized gains | 11 | 7 |
| Realized losses | 9 | 14 |
| Progress Energy | ||
| FV-NI: | ||
| Realized gains | 354 | 44 |
| Realized losses | 50 | 19 |
| AFS: | ||
| Realized gains | 6 | 3 |
| Realized losses | 7 | 6 |
| Duke Energy Progress | ||
| FV-NI: | ||
| Realized gains | 354 | 44 |
| Realized losses | 50 | 19 |
| AFS: | ||
| Realized gains | 6 | 3 |
| Realized losses | $ 7 | $ 6 |