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Investments in Debt and Equity Securities (Estimated Fair Value of Investments in Debt and Equity Securities) (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale    
Estimated Fair Value $ 4,439  
Total Investments    
Unrealized Holding Gains 6,153 $ 5,804
Unrealized Holding Losses 98 219
Estimated Fair Value 13,325 11,905
NDTF    
Equity Securities, FV-NI    
Gross Unrealized Holding Gains 6,041 5,753
Gross Unrealized Holding Losses 14 61
Estimated Fair Value 8,519 8,233
Debt Securities, Available-for-sale    
Estimated Fair Value 4,193 3,060
Total Investments    
Unrealized Holding Gains 6,096 5,765
Unrealized Holding Losses 89 200
Estimated Fair Value 12,887 11,432
NDTF | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 175 139
NDTF | Corporate debt securities    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 17 6
Gross Unrealized Holding Losses 18 33
Estimated Fair Value 1,056 673
NDTF | Municipal bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 4 2
Gross Unrealized Holding Losses 13 14
Estimated Fair Value 366 342
NDTF | U.S. government bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 31 3
Gross Unrealized Holding Losses 39 84
Estimated Fair Value 2,487 1,806
NDTF | Other debt securities    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 3 1
Gross Unrealized Holding Losses 5 8
Estimated Fair Value 284 239
Other Investments    
Equity Securities, FV-NI    
Gross Unrealized Holding Gains 57 39
Gross Unrealized Holding Losses   4
Estimated Fair Value 139 160
Debt Securities, Available-for-sale    
Estimated Fair Value 246 266
Total Investments    
Unrealized Holding Gains 57 39
Unrealized Holding Losses 9 19
Estimated Fair Value 438 473
Other Investments | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 53 47
Other Investments | Corporate debt securities    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Losses 2 5
Estimated Fair Value 75 79
Other Investments | Municipal bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Losses 1 1
Estimated Fair Value 67 83
Other Investments | U.S. government bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Losses 4 5
Estimated Fair Value 59 59
Other Investments | Other debt securities    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Losses 2 4
Estimated Fair Value 45 45
Duke Energy Carolinas    
Debt Securities, Available-for-sale    
Estimated Fair Value 2,349  
Duke Energy Carolinas | NDTF    
Equity Securities, FV-NI    
Gross Unrealized Holding Gains 3,533 3,386
Gross Unrealized Holding Losses 10 33
Estimated Fair Value 4,896 4,751
Debt Securities, Available-for-sale    
Estimated Fair Value 2,349 1,651
Total Investments    
Unrealized Holding Gains 3,561 3,389
Unrealized Holding Losses 61 122
Estimated Fair Value 7,337 6,464
Duke Energy Carolinas | NDTF | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 92 62
Duke Energy Carolinas | NDTF | Corporate debt securities    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 9 2
Gross Unrealized Holding Losses 15 27
Estimated Fair Value 662 401
Duke Energy Carolinas | NDTF | Municipal bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Losses 5 4
Estimated Fair Value 42 36
Duke Energy Carolinas | NDTF | U.S. government bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 16  
Gross Unrealized Holding Losses 26 50
Estimated Fair Value 1,403 991
Duke Energy Carolinas | NDTF | Other debt securities    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 3 1
Gross Unrealized Holding Losses 5 8
Estimated Fair Value 242 223
Progress Energy    
Debt Securities, Available-for-sale    
Estimated Fair Value 1,868  
Total Investments    
Unrealized Holding Gains 2,535 2,376
Unrealized Holding Losses 28 78
Estimated Fair Value 5,608 5,015
Progress Energy | NDTF    
Equity Securities, FV-NI    
Gross Unrealized Holding Gains 2,508 2,367
Gross Unrealized Holding Losses 4 28
Estimated Fair Value 3,623 3,482
Debt Securities, Available-for-sale    
Estimated Fair Value 1,844 1,409
Total Investments    
Unrealized Holding Gains 2,535 2,376
Unrealized Holding Losses 28 78
Estimated Fair Value 5,550 4,968
Progress Energy | NDTF | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 83 77
Progress Energy | NDTF | Corporate debt securities    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 8 4
Gross Unrealized Holding Losses 3 6
Estimated Fair Value 394 272
Progress Energy | NDTF | Municipal bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 4 2
Gross Unrealized Holding Losses 8 10
Estimated Fair Value 324 306
Progress Energy | NDTF | U.S. government bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 15 3
Gross Unrealized Holding Losses 13 34
Estimated Fair Value 1,084 815
Progress Energy | NDTF | Other debt securities    
Debt Securities, Available-for-sale    
Estimated Fair Value 42 16
Progress Energy | Other Investments    
Debt Securities, Available-for-sale    
Estimated Fair Value 24 24
Total Investments    
Estimated Fair Value 58 47
Progress Energy | Other Investments | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 34 23
Progress Energy | Other Investments | Municipal bonds    
Debt Securities, Available-for-sale    
Estimated Fair Value 24 24
Duke Energy Progress    
Debt Securities, Available-for-sale    
Estimated Fair Value 1,698  
Total Investments    
Unrealized Holding Gains 2,406 2,265
Unrealized Holding Losses 25 70
Estimated Fair Value 5,278 4,653
Duke Energy Progress | NDTF    
Equity Securities, FV-NI    
Gross Unrealized Holding Gains 2,380 2,256
Gross Unrealized Holding Losses 4 28
Estimated Fair Value 3,485 3,362
Debt Securities, Available-for-sale    
Estimated Fair Value 1,698 1,221
Total Investments    
Unrealized Holding Gains 2,406 2,265
Unrealized Holding Losses 25 70
Estimated Fair Value 5,254 4,637
Duke Energy Progress | NDTF | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 71 54
Duke Energy Progress | NDTF | Corporate debt securities    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 8 4
Gross Unrealized Holding Losses 3 6
Estimated Fair Value 375 256
Duke Energy Progress | NDTF | Municipal bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 4 2
Gross Unrealized Holding Losses 8 10
Estimated Fair Value 324 306
Duke Energy Progress | NDTF | U.S. government bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 14 3
Gross Unrealized Holding Losses 10 26
Estimated Fair Value 958 645
Duke Energy Progress | NDTF | Other debt securities    
Debt Securities, Available-for-sale    
Estimated Fair Value 41 14
Duke Energy Progress | Other Investments    
Total Investments    
Estimated Fair Value 24 16
Duke Energy Progress | Other Investments | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 24 16
Duke Energy Florida    
Debt Securities, Available-for-sale    
Estimated Fair Value 170  
Total Investments    
Unrealized Holding Gains 129 111
Unrealized Holding Losses 3 8
Estimated Fair Value 325 358
Duke Energy Florida | NDTF    
Equity Securities, FV-NI    
Gross Unrealized Holding Gains 128 111
Estimated Fair Value 138 120
Debt Securities, Available-for-sale    
Estimated Fair Value 146 188
Total Investments    
Unrealized Holding Gains 129 111
Unrealized Holding Losses 3 8
Estimated Fair Value 296 331
Duke Energy Florida | NDTF | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 12 23
Duke Energy Florida | NDTF | Corporate debt securities    
Debt Securities, Available-for-sale    
Estimated Fair Value 19 16
Duke Energy Florida | NDTF | U.S. government bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Gains 1  
Gross Unrealized Holding Losses 3 8
Estimated Fair Value 126 170
Duke Energy Florida | NDTF | Other debt securities    
Debt Securities, Available-for-sale    
Estimated Fair Value 1 2
Duke Energy Florida | Other Investments    
Debt Securities, Available-for-sale    
Estimated Fair Value 24 24
Total Investments    
Estimated Fair Value 29 27
Duke Energy Florida | Other Investments | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value 5 3
Duke Energy Florida | Other Investments | Municipal bonds    
Debt Securities, Available-for-sale    
Estimated Fair Value 24 24
Duke Energy Indiana    
Debt Securities, Available-for-sale    
Estimated Fair Value 29  
Total Investments    
Unrealized Holding Gains 6  
Unrealized Holding Losses 1 5
Estimated Fair Value 82 146
Duke Energy Indiana | Other Investments    
Equity Securities, FV-NI    
Gross Unrealized Holding Gains 6  
Gross Unrealized Holding Losses   4
Estimated Fair Value 53 89
Debt Securities, Available-for-sale    
Estimated Fair Value 29 56
Duke Energy Indiana | Other Investments | Cash and cash equivalents    
Cash and Cash Equivalents    
Estimated Fair Value   1
Duke Energy Indiana | Other Investments | Corporate debt securities    
Debt Securities, Available-for-sale    
Estimated Fair Value 1 6
Duke Energy Indiana | Other Investments | Municipal bonds    
Debt Securities, Available-for-sale    
Gross Unrealized Holding Losses 1 1
Estimated Fair Value 25 43
Duke Energy Indiana | Other Investments | U.S. government bonds    
Debt Securities, Available-for-sale    
Estimated Fair Value $ 3 $ 7