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Business Segments (Business Segment Data) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues $ 8,542 $ 8,154 $ 24,299 $ 22,997  
Less:          
Operation, maintenance and other 1,762 1,409 4,916 4,108  
Depreciation and amortization 1,626 1,516 4,721 4,312  
Property and other taxes 438 383 1,281 1,162  
Impairment of assets and other charges 0 (5) 3 39  
Interest expense 902 872 2,688 2,513  
Income tax expense (benefit) 176 163 488 481  
Noncontrolling interests 33 31 81 65  
Preferred dividends 14 39 41 92  
Preferred redemption costs 0 16 0 16  
Equity in earnings of unconsolidated affiliates 16 15 38 53  
Add: Other 199 173 534 527  
Segment income (loss) 1,407 1,204 3,744 3,202  
Loss From Discontinued Operations, net of tax 0 22 (1) 9  
Net Income Available to Duke Energy Corporation Common Stockholders 1,407 1,226 3,743 3,211  
Income (loss) attributable to noncontrolling interest 33 34 81 68  
Net income (loss) 1,454 1,315 3,865 3,387  
Capital investments expenditures and acquisitions     9,881 9,199  
Total Assets 192,293   192,293   $ 186,343
Fuel used in electric generation and purchased power          
Less:          
Cost of sales 2,289 2,644 6,266 7,207  
Cost of natural gas          
Less:          
Cost of sales 110 70 642 380  
Duke Energy Carolinas          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 2,632 2,707 7,387 7,411  
Less:          
Cost of sales 706 922 2,080 2,531  
Operation, maintenance and other 487 463 1,471 1,358  
Depreciation and amortization 488 472 1,402 1,306  
Property and other taxes 96 88 283 271  
Impairment of assets and other charges 1 (2) 0 32  
Interest expense 184 189 584 537  
Income tax expense (benefit) 51 49 138 153  
Add: Other 65 58 193 182  
Segment income (loss) 684 584 1,622 1,405  
Net income (loss)     1,622 1,405  
Capital investments expenditures and acquisitions     3,159 2,923  
Total Assets 57,921   57,921   55,005
Duke Energy Carolinas | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 706 922 2,080 2,531  
Progress Energy          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 4,074 3,860 11,110 10,445  
Less:          
Cost of sales 1,175 1,384 3,306 3,729  
Operation, maintenance and other 944 653 2,475 1,869  
Depreciation and amortization 670 640 1,910 1,795  
Property and other taxes 201 170 548 494  
Impairment of assets and other charges (2) (3) (2) 6  
Interest expense 272 271 830 796  
Income tax expense (benefit) 143 130 361 320  
Add: Other 86 63 228 198  
Segment income (loss) 757 678 1,910 1,634  
Net income (loss) 757 678 1,910 1,634  
Capital investments expenditures and acquisitions     4,320 3,891  
Total Assets 74,564   74,564   71,636
Progress Energy | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 1,175 1,384 3,306 3,729  
Duke Energy Progress          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 1,913 1,914 5,612 5,338  
Less:          
Cost of sales 629 679 1,928 1,896  
Operation, maintenance and other 362 376 1,100 1,077  
Depreciation and amortization 373 354 1,049 999  
Property and other taxes 54 43 159 144  
Impairment of assets and other charges (2) (3) (2) 6  
Interest expense 125 127 392 370  
Income tax expense (benefit) 56 48 151 135  
Add: Other 56 35 143 109  
Segment income (loss) 372 325 978 820  
Net income (loss)     978 820  
Capital investments expenditures and acquisitions     2,372 2,036  
Total Assets 41,907   41,907   39,493
Duke Energy Progress | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 629 679 1,928 1,896  
Duke Energy Florida          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 2,157 1,940 5,486 5,092  
Less:          
Cost of sales 546 705 1,378 1,833  
Operation, maintenance and other 579 272 1,365 779  
Depreciation and amortization 297 286 861 796  
Property and other taxes 147 127 389 350  
Interest expense 118 114 352 339  
Income tax expense (benefit) 96 94 235 212  
Add: Other 23 22 69 69  
Segment income (loss) 397 364 975 852  
Net income (loss)     975 852  
Capital investments expenditures and acquisitions     1,948 1,855  
Total Assets 29,214   29,214   28,569
Duke Energy Florida | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 546 705 1,378 1,833  
Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 679 605 2,099 1,891  
Less:          
Operation, maintenance and other 127 131 366 378  
Depreciation and amortization 120 102 353 297  
Property and other taxes 109 99 326 303  
Interest expense 52 52 150 144  
Income tax expense (benefit) 13 7 47 42  
Add: Other 7 2 18 12  
Segment income (loss) 78 52 242 223  
Net income (loss)     242 223  
Capital investments expenditures and acquisitions     709 640  
Total Assets 13,272   13,272   12,768
Duke Energy Ohio | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 175 146 485 416  
Duke Energy Ohio | Cost of natural gas          
Less:          
Cost of sales 12 18 148 100  
Duke Energy Indiana          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 992 836 2,671 2,342  
Less:          
Cost of sales 324 267 803 761  
Operation, maintenance and other 214 169 601 510  
Depreciation and amortization 203 166 617 507  
Property and other taxes 9 7 44 37  
Interest expense 66 58 182 173  
Income tax expense (benefit) 24 29 60 65  
Add: Other 15 16 46 44  
Segment income (loss) 167 156 410 333  
Net income (loss)     410 333  
Capital investments expenditures and acquisitions     841 711  
Total Assets 16,165   16,165   15,727
Duke Energy Indiana | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 324 267 803 761  
Piedmont          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 271 219 1,463 1,139  
Less:          
Cost of sales 98 52 494 280  
Operation, maintenance and other 102 87 301 267  
Depreciation and amortization 69 65 210 191  
Property and other taxes 19 16 56 47  
Interest expense 48 47 143 135  
Income tax expense (benefit) (12) (10) 56 49  
Equity in earnings of unconsolidated affiliates 3 2 6 6  
Add: Other 12 12 34 42  
Segment income (loss) (38) (24) 243 218  
Net income (loss) (38) (24) 243 218  
Capital investments expenditures and acquisitions     595 800  
Total Assets 12,036   12,036   11,799
Piedmont | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 98 52 494 280  
Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 6 12 21 30  
Less:          
Operation, maintenance and other (38) (44) (59) (70)  
Depreciation and amortization 79 72 233 216  
Property and other taxes 2 3 8 10  
Impairment of assets and other charges 0 0 5 1  
Interest expense 332 321 968 921  
Income tax expense (benefit) (79) (66) (243) (207)  
Noncontrolling interests 0 0 0 0  
Preferred dividends 14 39 41 92  
Preferred redemption costs   16   16  
Equity in earnings of unconsolidated affiliates 12 10 27 46  
Add: Other 33 67 91 188  
Segment income (loss) (225) (222) (713) (625)  
Capital investments expenditures and acquisitions     245 203  
Total Assets 4,178   4,178   4,202
Other | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Other | Cost of natural gas          
Less:          
Cost of sales 0 0 0 0  
Eliminations, Corporate and Reconciling Items          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 40 42 122 120  
Eliminations, Corporate and Reconciling Items | Duke Energy Carolinas          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 0 0 0 0  
Less:          
Operation, maintenance and other 10 2 32 23  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 0 0 0  
Impairment of assets and other charges 0 0 0 0  
Interest expense 0 0 0 0  
Income tax expense (benefit) (3) (1) (8) (6)  
Add: Other (1) (1) (2) (2)  
Segment income (loss) (8) (2) (26) (19)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 221   221   223
Eliminations, Corporate and Reconciling Items | Duke Energy Carolinas | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Eliminations, Corporate and Reconciling Items | Progress Energy          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 4 6 12 15  
Less:          
Operation, maintenance and other 9 7 39 36  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 0 0 0  
Impairment of assets and other charges   0   0  
Interest expense 29 30 86 87  
Income tax expense (benefit) (12) (12) (33) (31)  
Add: Other 5 10 10 28  
Segment income (loss) (17) (9) (70) (49)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 4,272   4,272   3,685
Eliminations, Corporate and Reconciling Items | Progress Energy | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Eliminations, Corporate and Reconciling Items | Duke Energy Progress          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 0 0 0 0  
Less:          
Operation, maintenance and other 4 2 18 14  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 0 0 0  
Impairment of assets and other charges   0   0  
Interest expense 0 0 0 0  
Income tax expense (benefit) (2) 0 (5) (2)  
Add: Other (2) 3 (4) 5  
Segment income (loss) (4) 1 (17) (7)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 744   744   91
Eliminations, Corporate and Reconciling Items | Duke Energy Progress | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Eliminations, Corporate and Reconciling Items | Duke Energy Florida          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 0 0 0 0  
Less:          
Operation, maintenance and other 2 0 11 9  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 0 0 0  
Interest expense 0 0 0 0  
Income tax expense (benefit) (1) 0 (3) (2)  
Add: Other 0 1 (2) 3  
Segment income (loss) (1) 1 (10) (4)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 85   85   20
Eliminations, Corporate and Reconciling Items | Duke Energy Florida | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Eliminations, Corporate and Reconciling Items | Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 0 0 0 0  
Less:          
Operation, maintenance and other 1 0 5 4  
Depreciation and amortization 1 0 0 0  
Property and other taxes 1 0 1 0  
Interest expense 0 2 1 1  
Income tax expense (benefit) (1) (1) (2) (2)  
Add: Other 1 0 0 (1)  
Segment income (loss) (1) (1) (5) (4)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 192   192   51
Eliminations, Corporate and Reconciling Items | Duke Energy Ohio | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Eliminations, Corporate and Reconciling Items | Duke Energy Ohio | Cost of natural gas          
Less:          
Cost of sales 0 0 0 0  
Eliminations, Corporate and Reconciling Items | Duke Energy Indiana          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 0 0 0 0  
Less:          
Operation, maintenance and other 2 0 7 2  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 0 0 0  
Interest expense 0 0 0 0  
Income tax expense (benefit) 0 0 (2) 0  
Add: Other 0 1 (1) 0  
Segment income (loss) (2) 1 (6) (2)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 204   204   1
Eliminations, Corporate and Reconciling Items | Duke Energy Indiana | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Eliminations, Corporate and Reconciling Items | Piedmont          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 0 0 0 0  
Less:          
Operation, maintenance and other 8 1 12 3  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 0 0 0  
Interest expense 0 0 1 0  
Income tax expense (benefit) (1) 0 (2) 1  
Equity in earnings of unconsolidated affiliates 3 2 6 6  
Add: Other 0 0 0 0  
Segment income (loss) (4) 1 (5) 2  
Capital investments expenditures and acquisitions     0 0  
Total Assets 89   89   92
Eliminations, Corporate and Reconciling Items | Piedmont | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Eliminations and Reconciling Items          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues (34) (30) (101) (90)  
Eliminations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues (72) (72) (215) (213)  
Less:          
Operation, maintenance and other (53) (47) (150) (146)  
Depreciation and amortization (7) (8) (21) (21)  
Property and other taxes 1 (1) 1 (1)  
Impairment of assets and other charges 1 0 0 0  
Interest expense (19) (30) (64) (98)  
Income tax expense (benefit) 1 (1) 1 0  
Noncontrolling interests (1) 0 (1) (1)  
Preferred dividends 0 0 0 0  
Preferred redemption costs   0   0  
Equity in earnings of unconsolidated affiliates (1) 0 0 0  
Add: Other (24) (35) (79) (113)  
Segment income (loss) 0 0 0 0  
Capital investments expenditures and acquisitions     0 0  
Total Assets 0   0   0
Eliminations | Fuel used in electric generation and purchased power          
Less:          
Cost of sales (20) (20) (60) (59)  
Eliminations | Cost of natural gas          
Less:          
Cost of sales 0 0 0 0  
Eliminations | Progress Energy          
Less:          
Impairment of assets and other charges 0   0    
Eliminations | Duke Energy Progress          
Less:          
Impairment of assets and other charges 0   0    
Total Reportable Segments          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 8,536 8,142 24,278 22,967  
Total Reportable Segments | Operating Segments          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 8,574 8,184 24,392 23,090  
Less:          
Operation, maintenance and other 1,853 1,500 5,125 4,324  
Depreciation and amortization 1,554 1,452 4,509 4,117  
Property and other taxes 435 381 1,272 1,153  
Impairment of assets and other charges (1) (5) (2) 38  
Interest expense 589 581 1,784 1,690  
Income tax expense (benefit) 254 230 730 688  
Noncontrolling interests 34 31 82 66  
Preferred dividends 0 0 0 0  
Preferred redemption costs   0   0  
Equity in earnings of unconsolidated affiliates 5 5 11 7  
Add: Other 190 141 522 452  
Segment income (loss) 1,632 1,426 4,457 3,827  
Capital investments expenditures and acquisitions     9,636 8,996  
Total Assets 188,115   188,115   182,141
Total Reportable Segments | Operating Segments | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 2,309 2,664 6,326 7,266  
Total Reportable Segments | Operating Segments | Cost of natural gas          
Less:          
Cost of sales 110 70 642 380  
Total Reportable Segments | Operating Segments | Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 679 605 2,099 1,891  
Less:          
Operation, maintenance and other 126 131 361 374  
Depreciation and amortization 119 102 353 297  
Property and other taxes 108 99 325 303  
Interest expense 52 50 149 143  
Income tax expense (benefit) 14 8 49 44  
Add: Other 6 2 18 13  
Segment income (loss) 79 53 247 227  
Capital investments expenditures and acquisitions     709 640  
Total Assets 13,080   13,080   12,717
Total Reportable Segments | Operating Segments | Duke Energy Ohio | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 175 146 485 416  
Total Reportable Segments | Operating Segments | Duke Energy Ohio | Cost of natural gas          
Less:          
Cost of sales 12 18 148 100  
Total Reportable Segments | Eliminations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues (38) (42) (114) (123)  
Electric Utilities and Infrastructure          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 8,165 7,833 22,320 21,420  
Electric Utilities and Infrastructure | Operating Segments          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 8,180 7,852 22,365 21,475  
Less:          
Operation, maintenance and other 1,728 1,387 4,746 3,965  
Depreciation and amortization 1,448 1,352 4,184 3,823  
Property and other taxes 394 345 1,143 1,033  
Impairment of assets and other charges (1) (5) (2) 38  
Interest expense 522 514 1,587 1,501  
Income tax expense (benefit) 264 244 653 631  
Noncontrolling interests 34 31 82 66  
Preferred dividends 0 0 0 0  
Preferred redemption costs   0   0  
Equity in earnings of unconsolidated affiliates 0 2 0 4  
Add: Other 176 129 482 406  
Segment income (loss) 1,658 1,451 4,128 3,562  
Capital investments expenditures and acquisitions     8,789 7,969  
Total Assets 169,647   169,647   164,010
Electric Utilities and Infrastructure | Operating Segments | Operating revenues          
Less:          
Customer billing adjustments   17   17  
Electric Utilities and Infrastructure | Operating Segments | Operations, maintenance and other          
Less:          
Income (expense) related to rate case order       2  
Electric Utilities and Infrastructure | Operating Segments | Impairment of assets and other charges          
Less:          
Income (expense) related to rate case order       42  
Electric Utilities and Infrastructure | Operating Segments | Interest expense          
Less:          
Income (expense) related to rate case order       (11)  
Electric Utilities and Infrastructure | Operating Segments | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 2,309 2,664 6,326 7,266  
Electric Utilities and Infrastructure | Operating Segments | Cost of natural gas          
Less:          
Cost of sales 0 0 0 0  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 2,632 2,707 7,387 7,411  
Less:          
Operation, maintenance and other 477 461 1,439 1,335  
Depreciation and amortization 488 472 1,402 1,306  
Property and other taxes 96 88 283 271  
Impairment of assets and other charges 1 (2) 0 32  
Interest expense 184 189 584 537  
Income tax expense (benefit) 54 50 146 159  
Add: Other 66 59 195 184  
Segment income (loss) 692 586 1,648 1,424  
Capital investments expenditures and acquisitions     3,159 2,923  
Total Assets 57,700   57,700   54,782
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 706 922 2,080 2,531  
Electric Utilities and Infrastructure | Operating Segments | Progress Energy          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 4,070 3,854 11,098 10,430  
Less:          
Operation, maintenance and other 935 646 2,436 1,833  
Depreciation and amortization 670 640 1,910 1,795  
Property and other taxes 201 170 548 494  
Impairment of assets and other charges (2) (3) (2) 6  
Interest expense 243 241 744 709  
Income tax expense (benefit) 155 142 394 351  
Add: Other 81 53 218 170  
Segment income (loss) 774 687 1,980 1,683  
Capital investments expenditures and acquisitions     4,320 3,891  
Total Assets 70,292   70,292   67,951
Electric Utilities and Infrastructure | Operating Segments | Progress Energy | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 1,175 1,384 3,306 3,729  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 1,913 1,914 5,612 5,338  
Less:          
Operation, maintenance and other 358 374 1,082 1,063  
Depreciation and amortization 373 354 1,049 999  
Property and other taxes 54 43 159 144  
Impairment of assets and other charges (2) (3) (2) 6  
Interest expense 125 127 392 370  
Income tax expense (benefit) 58 48 156 137  
Add: Other 58 32 147 104  
Segment income (loss) 376 324 995 827  
Capital investments expenditures and acquisitions     2,372 2,036  
Total Assets 41,163   41,163   39,402
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 629 679 1,928 1,896  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Florida          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 2,157 1,940 5,486 5,092  
Less:          
Operation, maintenance and other 577 272 1,354 770  
Depreciation and amortization 297 286 861 796  
Property and other taxes 147 127 389 350  
Interest expense 118 114 352 339  
Income tax expense (benefit) 97 94 238 214  
Add: Other 23 21 71 66  
Segment income (loss) 398 363 985 856  
Capital investments expenditures and acquisitions     1,948 1,855  
Total Assets 29,129   29,129   28,549
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Florida | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 546 705 1,378 1,833  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 561 497 1,546 1,431  
Less:          
Operation, maintenance and other 98 106 277 287  
Depreciation and amortization 83 70 242 201  
Property and other taxes 87 79 253 230  
Interest expense 34 32 97 93  
Income tax expense (benefit) 13 10 31 33  
Add: Other 4 3 12 10  
Segment income (loss) 75 57 173 181  
Capital investments expenditures and acquisitions     457 421  
Total Assets 8,433   8,433   8,211
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 175 146 485 416  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio | Cost of natural gas          
Less:          
Cost of sales 0 0 0 0  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Indiana          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 992 836 2,671 2,342  
Less:          
Operation, maintenance and other 212 169 594 508  
Depreciation and amortization 203 166 617 507  
Property and other taxes 9 7 44 37  
Interest expense 66 58 182 173  
Income tax expense (benefit) 24 29 62 65  
Add: Other 15 15 47 44  
Segment income (loss) 169 155 416 335  
Capital investments expenditures and acquisitions     841 711  
Total Assets 15,961   15,961   15,726
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Indiana | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 324 267 803 761  
Electric Utilities and Infrastructure | Eliminations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues (15) (19) (45) (55)  
Gas Utilities and Infrastructure          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 371 309 1,958 1,547  
Gas Utilities and Infrastructure | Operating Segments          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 394 332 2,027 1,615  
Less:          
Operation, maintenance and other 125 113 379 359  
Depreciation and amortization 106 100 325 294  
Property and other taxes 41 36 129 120  
Impairment of assets and other charges 0 0 0 0  
Interest expense 67 67 197 189  
Income tax expense (benefit) (10) (14) 77 57  
Noncontrolling interests 0 0 0 0  
Preferred dividends 0 0 0 0  
Preferred redemption costs   0   0  
Equity in earnings of unconsolidated affiliates 5 3 11 3  
Add: Other 14 12 40 46  
Segment income (loss) (26) (25) 329 265  
Capital investments expenditures and acquisitions     847 1,027  
Total Assets 18,468   18,468   18,131
Gas Utilities and Infrastructure | Operating Segments | Operating revenues          
Less:          
Customer billing adjustments       1  
Gas Utilities and Infrastructure | Operating Segments | Operations, maintenance and other          
Less:          
Customer billing adjustments   1      
Gas Utilities and Infrastructure | Operating Segments | Other income and expenses          
Less:          
Customer billing adjustments   3   3  
Gas Utilities and Infrastructure | Operating Segments | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Gas Utilities and Infrastructure | Operating Segments | Cost of natural gas          
Less:          
Cost of sales 110 70 642 380  
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 118 108 553 460  
Less:          
Operation, maintenance and other 28 25 84 87  
Depreciation and amortization 36 32 111 96  
Property and other taxes 21 20 72 73  
Interest expense 18 18 52 50  
Income tax expense (benefit) 1 (2) 18 11  
Add: Other 2 (1) 6 3  
Segment income (loss) 4 (4) 74 46  
Capital investments expenditures and acquisitions     252 219  
Total Assets 4,647   4,647   4,506
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 0 0 0 0  
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio | Cost of natural gas          
Less:          
Cost of sales 12 18 148 100  
Gas Utilities and Infrastructure | Operating Segments | Piedmont          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 271 219 1,463 1,139  
Less:          
Operation, maintenance and other 94 86 289 264  
Depreciation and amortization 69 65 210 191  
Property and other taxes 19 16 56 47  
Interest expense 48 47 142 135  
Income tax expense (benefit) (11) (10) 58 48  
Equity in earnings of unconsolidated affiliates 0 0 0 0  
Add: Other 12 12 34 42  
Segment income (loss) (34) (25) 248 216  
Capital investments expenditures and acquisitions     595 800  
Total Assets 11,947   11,947   $ 11,707
Gas Utilities and Infrastructure | Operating Segments | Piedmont | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 98 52 494 280  
Gas Utilities and Infrastructure | Eliminations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues $ (23) $ (23) $ (69) $ (68)