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Leases (Supplemental Financial Information) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Assets    
Operating lease right-of-use assets, net $ 1,241 $ 1,148
Net property, plant and equipment 654 645
Total lease assets 1,895 1,793
Current    
Operating 238 208
Finance 55 46
Noncurrent    
Operating 1,033 957
Finance 521 524
Total lease liabilities 1,847 1,735
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases 277 250
Operating cash flows from finance leases 40 41
Financing cash flows from finance leases 64 113
Lease assets obtained in exchange for new lease liabilities (non-cash)    
Operating 348 322
Finance $ 72 $ 81
Weighted average remaining lease term (years)    
Operating leases 8 years 8 years
Finance leases 12 years 11 years
Weighted-average discount rate (as a percent)    
Operating leases 4.50% 4.30%
Finance leases 8.20% 8.40%
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Public utilities, property, plant and equipment, net Public utilities, property, plant and equipment, net
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Current Liabilities: Other Current Liabilities: Other
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Current maturities of long-term debt Current maturities of long-term debt
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] Operating lease liabilities Operating lease liabilities
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Long-Term Debt Long-Term Debt
Duke Energy Carolinas    
Assets    
Operating lease right-of-use assets, net $ 91 $ 98
Net property, plant and equipment 251 252
Total lease assets 342 350
Current    
Operating 20 20
Finance 11 8
Noncurrent    
Operating 79 87
Finance 261 262
Total lease liabilities 371 377
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases 24 24
Operating cash flows from finance leases 30 31
Financing cash flows from finance leases 12 7
Lease assets obtained in exchange for new lease liabilities (non-cash)    
Operating 4 50
Finance $ 15 $ 1
Weighted average remaining lease term (years)    
Operating leases 9 years 9 years
Finance leases 14 years 15 years
Weighted-average discount rate (as a percent)    
Operating leases 4.40% 4.30%
Finance leases 11.30% 11.50%
Progress Energy    
Assets    
Operating lease right-of-use assets, net $ 607 $ 625
Net property, plant and equipment 605 620
Total lease assets 1,212 1,245
Current    
Operating 100 97
Finance 53 48
Noncurrent    
Operating 552 557
Finance 516 533
Total lease liabilities 1,221 1,235
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases 122 122
Operating cash flows from finance leases 43 44
Financing cash flows from finance leases 53 46
Lease assets obtained in exchange for new lease liabilities (non-cash)    
Operating 6 43
Finance $ 40 $ 55
Weighted average remaining lease term (years)    
Operating leases 10 years 9 years
Finance leases 11 years 11 years
Weighted-average discount rate (as a percent)    
Operating leases 4.40% 4.00%
Finance leases 8.60% 8.90%
Duke Energy Progress    
Assets    
Operating lease right-of-use assets, net $ 386 $ 348
Net property, plant and equipment 478 512
Total lease assets 864 860
Current    
Operating 43 42
Finance 45 41
Noncurrent    
Operating 384 332
Finance 436 474
Total lease liabilities 908 889
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases 56 57
Operating cash flows from finance leases 39 41
Financing cash flows from finance leases 43 38
Lease assets obtained in exchange for new lease liabilities (non-cash)    
Operating 6 $ 3
Finance $ 9  
Weighted average remaining lease term (years)    
Operating leases 9 years 8 years
Finance leases 10 years 10 years
Weighted-average discount rate (as a percent)    
Operating leases 4.40% 3.90%
Finance leases 9.20% 9.20%
Duke Energy Florida    
Assets    
Operating lease right-of-use assets, net $ 221 $ 277
Net property, plant and equipment 127 108
Total lease assets 348 385
Current    
Operating 57 55
Finance 8 7
Noncurrent    
Operating 168 225
Finance 80 59
Total lease liabilities 313 346
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases 66 65
Operating cash flows from finance leases 4 3
Financing cash flows from finance leases 10 8
Lease assets obtained in exchange for new lease liabilities (non-cash)    
Operating   40
Finance $ 31 $ 55
Weighted average remaining lease term (years)    
Operating leases 12 years 11 years
Finance leases 21 years 15 years
Weighted-average discount rate (as a percent)    
Operating leases 4.30% 4.20%
Finance leases 5.80% 5.90%
Duke Energy Ohio    
Assets    
Operating lease right-of-use assets, net $ 5 $ 6
Total lease assets 5 6
Current    
Operating   1
Noncurrent    
Operating 5 6
Total lease liabilities 5 7
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases $ 1 $ 1
Weighted average remaining lease term (years)    
Operating leases 11 years 11 years
Finance leases 0 years 0 years
Weighted-average discount rate (as a percent)    
Operating leases 4.20% 4.10%
Duke Energy Indiana    
Assets    
Operating lease right-of-use assets, net $ 32 $ 37
Net property, plant and equipment 8 6
Total lease assets 40 43
Current    
Operating 6 6
Noncurrent    
Operating 28 33
Finance 10 10
Total lease liabilities 44 49
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases 8 8
Operating cash flows from finance leases 1 1
Financing cash flows from finance leases 2  
Lease assets obtained in exchange for new lease liabilities (non-cash)    
Operating 1 7
Finance $ 2 $ 1
Weighted average remaining lease term (years)    
Operating leases 9 years 11 years
Finance leases 19 years 20 years
Weighted-average discount rate (as a percent)    
Operating leases 3.90% 4.00%
Finance leases 11.60% 11.70%
Piedmont    
Assets    
Operating lease right-of-use assets, net $ 2 $ 4
Total lease assets 2 4
Current    
Operating 1 1
Noncurrent    
Operating 2 7
Total lease liabilities 3 8
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases $ 1 1
Lease assets obtained in exchange for new lease liabilities (non-cash)    
Operating   $ 3
Weighted average remaining lease term (years)    
Operating leases 3 years 4 years
Finance leases 0 years 0 years
Weighted-average discount rate (as a percent)    
Operating leases 4.00% 3.90%