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Employee Benefit Plans (Fair Value Measurements of Plan Assets - Master Retirement Trust) (Details) - USD ($) $ in Millions | Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 7,296 | $ 6,969 |
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 24 | $ 20 |
Duke Energy Carolinas | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 26.00% | 27.00% |
Progress Energy | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 34.00% | 33.00% |
Duke Energy Progress | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 15.00% | 15.00% |
Duke Energy Florida | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 19.00% | 18.00% |
Duke Energy Ohio | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 4.00% | 5.00% |
Duke Energy Indiana | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 7.00% | 7.00% |
Piedmont | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 4.00% | 3.00% |
Equity securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 2,630 | $ 2,461 |
Equity securities | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 12 | 10 |
Corporate debt securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,163 | 2,415 |
Short-term investment funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 355 | 310 |
Partnership interests | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 80 | 68 |
Hedge funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 301 | 164 |
Real estate | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | 1 |
U.S. government bonds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1,609 | 1,398 |
Governments bonds – foreign | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 133 | 128 |
Cash | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 30 | 15 |
Government and commercial mortgage-backed securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | 1 |
Net pending transactions and other investments | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | (6) | 9 |
Cash and cash equivalents | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 4 | 3 |
Debt securities | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 7 | 6 |
Level 1 | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,451 | 2,242 |
Level 1 | Equity securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,428 | 2,216 |
Level 1 | Cash | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 30 | 15 |
Level 1 | Net pending transactions and other investments | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | (7) | 11 |
Level 2 | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 4,464 | 4,481 |
Level 2 | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 24 | 20 |
Level 2 | Equity securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 202 | 231 |
Level 2 | Equity securities | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 12 | 10 |
Level 2 | Corporate debt securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,163 | 2,415 |
Level 2 | Short-term investment funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 355 | 310 |
Level 2 | Real estate | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | 1 |
Level 2 | U.S. government bonds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1,609 | 1,398 |
Level 2 | Governments bonds – foreign | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 133 | 128 |
Level 2 | Government and commercial mortgage-backed securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | 1 |
Level 2 | Net pending transactions and other investments | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | (2) |
Level 2 | Cash and cash equivalents | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 4 | 3 |
Level 2 | Debt securities | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 7 | 6 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 80 | 68 | $ 76
Level 3 | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 80 | 68 |
Level 3 | Partnership interests | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 80 | 68 |
Not Categorized | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 301 | 178 |
Not Categorized | Equity securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 14 |
Not Categorized | Hedge funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 301 | $ 164 |

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