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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