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Employee Benefit Plans (Fair Value Measurements of Plan Assets - Master Retirement Trust) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 7,241 | $ 7,073 |
OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 20 | $ 33 |
Duke Energy Carolinas | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 27.00% | 27.00% |
Progress Energy | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 33.00% | 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) | 18.00% | 18.00% |
Duke Energy Ohio | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Allocated assets (as a percent) | 5.00% | 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) | 3.00% | 3.00% |
Equity securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 2,221 | $ 2,234 |
Equity securities | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 9 | 12 |
Corporate debt securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,807 | 2,944 |
Short-term investment funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 233 | 193 |
Partnership interests | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 76 | 62 |
Hedge funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 164 | 209 |
Real estate | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | 2 |
U.S. government bonds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1,571 | 1,254 |
Governments bonds – foreign | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 107 | 112 |
Cash | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 7 | 45 |
Government and commercial mortgage-backed securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | 6 |
Net pending transactions and other investments | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 54 | 14 |
Cash and cash equivalents | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 4 | 11 |
Debt securities | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 6 | 8 |
Level 1 | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,042 | 2,065 |
Level 1 | Equity securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1,995 | 2,014 |
Level 1 | Short-term investment funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets |  | 1 |
Level 1 | Cash | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 7 | 45 |
Level 1 | Net pending transactions and other investments | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 40 | 5 |
Level 2 | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 4,944 | 4,711 |
Level 2 | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 20 | 33 |
Level 2 | Equity securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 211 | 194 |
Level 2 | Equity securities | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 9 | 12 |
Level 2 | Corporate debt securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 2,807 | 2,944 |
Level 2 | Short-term investment funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 233 | 192 |
Level 2 | Real estate | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | 2 |
Level 2 | U.S. government bonds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1,571 | 1,254 |
Level 2 | Governments bonds – foreign | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 107 | 112 |
Level 2 | Government and commercial mortgage-backed securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 1 | 6 |
Level 2 | Net pending transactions and other investments | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 14 | 9 |
Level 2 | Cash and cash equivalents | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 4 | 11 |
Level 2 | Debt securities | OPEB |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 6 | 8 |
Level 3 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 76 | 62 | $ 95
Level 3 | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 76 | 62 |
Level 3 | Partnership interests | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 76 | 62 |
Not Categorized | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 179 | 235 |
Not Categorized | Equity securities | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | 15 | 26 |
Not Categorized | Hedge funds | Master Trust |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Total assets | $ 164 | $ 209 |

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