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Employee Benefit Plans (Fair Value Measurements of Plan Assets - Master Retirement Trust) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 62 | $ 95
Master Trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 7,073 | 9,352
Master Trust | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2,065 | 2,975
Master Trust | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 4,711 | 6,038
Master Trust | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 62 | 95
Master Trust | Not Categorized |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 235 | 244
Master Trust | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2,234 | 2,575
Master Trust | Equity securities | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2,014 | 2,547
Master Trust | Equity securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 194 |
Master Trust | Equity securities | Not Categorized |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 26 | 28
Master Trust | Corporate debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2,944 | 4,189
Master Trust | Corporate debt securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2,944 | 4,189
Master Trust | Short-term investment funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 193 | 382
Master Trust | Short-term investment funds | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 1 | 272
Master Trust | Short-term investment funds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 192 | 110
Master Trust | Partnership interests |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 62 | 95
Master Trust | Partnership interests | Level 3 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 62 | 95
Master Trust | Hedge funds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 209 | 216
Master Trust | Hedge funds | Not Categorized |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 209 | 216
Master Trust | U.S. government bonds |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 1,254 | 1,618
Master Trust | U.S. government bonds | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 1,254 | 1,618
Master Trust | Governments bonds – foreign |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 112 | 78
Master Trust | Governments bonds – foreign | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 112 | 78
Master Trust | Cash |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 45 | 144
Master Trust | Cash | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 45 | 144
Master Trust | Government and commercial mortgage backed securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 6 | 2
Master Trust | Government and commercial mortgage backed securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 6 | 2
Master Trust | Net pending transactions and other investments |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 14 | 53
Master Trust | Net pending transactions and other investments | Level 1 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 5 | 12
Master Trust | Net pending transactions and other investments | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 9 | 41
OPEB |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 33 | 45
OPEB | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 33 | 45
OPEB | Equity securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 12 | 18
OPEB | Equity securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 12 | 18
OPEB | Real estate |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2 | 2
OPEB | Real estate | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 2 | 2
OPEB | Cash and cash equivalents |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 11 | 14
OPEB | Cash and cash equivalents | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 11 | 14
OPEB | Debt securities |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | 8 | 11
OPEB | Debt securities | Level 2 |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Total assets | $ 8 | $ 11
Duke Energy Carolinas | Master Trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocated assets (as a percent) | 27.00% | 26.00%
Progress Energy | Master Trust |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Allocated assets (as a percent) | 33.00% | 32.00%
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% | 17.00%
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% | 4.00%

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