v3.25.2
Business Segments (Business Segment Data) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues $ 7,508 $ 7,172 $ 15,757 $ 14,843  
Less:          
Operation, maintenance and other 1,655 1,320 3,154 2,699  
Depreciation and amortization 1,583 1,409 3,095 2,796  
Property and other taxes 415 393 843 779  
Impairment of assets and other charges 3 43 3 44  
Interest expense 897 824 1,786 1,641  
Income tax expense (benefit) 119 140 312 318  
Noncontrolling interests 23 21 48 34  
Preferred dividends 13 14 27 53  
Equity in earnings of unconsolidated affiliates 11 21 22 38  
Add: Other 197 173 335 354  
Segment income (loss) 972 896 2,337 1,998  
Loss From Discontinued Operations, net of tax (1) (10) (1) (13)  
Net Income Available to Duke Energy Corporation Common Stockholders 971 886 2,336 1,985  
Income (loss) attributable to noncontrolling interest 23 21 48 34  
Net income 1,007 921 2,411 2,072  
Capital investments expenditures and acquisitions     6,428 6,212  
Total Assets 189,713 181,575 189,713 181,575 $ 186,343
Fuel used in electric generation and purchased power          
Less:          
Cost of sales 1,878 2,228 3,977 4,563  
Cost of natural gas          
Less:          
Cost of sales 158 78 532 310  
Duke Energy Carolinas          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 2,231 2,297 4,755 4,704  
Less:          
Cost of sales 571 749 1,374 1,609  
Operation, maintenance and other 500 444 984 895  
Depreciation and amortization 482 437 914 834  
Property and other taxes 85 89 187 183  
Impairment of assets and other charges (1) 33 (1) 34  
Interest expense 200 168 400 348  
Income tax expense (benefit) 36 48 87 104  
Add: Other 67 62 128 124  
Segment income (loss) 425 391 938 821  
Net income     938 821  
Capital investments expenditures and acquisitions     2,145 1,949  
Total Assets 56,599 53,374 56,599 53,374 55,005
Duke Energy Carolinas | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 571 749 1,374 1,609  
Progress Energy          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 3,569 3,357 7,036 6,585  
Less:          
Cost of sales 1,025 1,202 2,131 2,345  
Operation, maintenance and other 843 588 1,531 1,216  
Depreciation and amortization 609 568 1,240 1,155  
Property and other taxes 175 166 347 324  
Impairment of assets and other charges 0 9 0 9  
Interest expense 283 265 558 525  
Income tax expense (benefit) 108 104 218 190  
Add: Other 81 66 142 135  
Segment income (loss) 607 521 1,153 956  
Net income 607 521 1,153 956  
Capital investments expenditures and acquisitions     2,742 2,623  
Total Assets 74,311 69,464 74,311 69,464 71,636
Progress Energy | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 1,025 1,202 2,131 2,345  
Duke Energy Progress          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 1,681 1,636 3,699 3,424  
Less:          
Cost of sales 574 597 1,299 1,217  
Operation, maintenance and other 340 326 738 701  
Depreciation and amortization 319 306 676 645  
Property and other taxes 45 50 105 101  
Impairment of assets and other charges 0 9 0 9  
Interest expense 139 123 267 243  
Income tax expense (benefit) 39 39 95 87  
Add: Other 50 37 87 74  
Segment income (loss) 275 223 606 495  
Net income     606 495  
Capital investments expenditures and acquisitions     1,524 1,373  
Total Assets 41,558 38,661 41,558 38,661 39,493
Duke Energy Progress | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 574 597 1,299 1,217  
Duke Energy Florida          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 1,885 1,716 3,329 3,152  
Less:          
Cost of sales 451 605 832 1,128  
Operation, maintenance and other 500 256 786 507  
Depreciation and amortization 290 262 564 510  
Property and other taxes 130 117 242 223  
Interest expense 116 114 234 225  
Income tax expense (benefit) 81 75 139 118  
Add: Other 27 22 46 47  
Segment income (loss) 344 309 578 488  
Net income     578 488  
Capital investments expenditures and acquisitions     1,218 1,251  
Total Assets 29,092 27,078 29,092 27,078 28,569
Duke Energy Florida | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 451 605 832 1,128  
Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 654 608 1,420 1,286  
Less:          
Operation, maintenance and other 115 121 239 247  
Depreciation and amortization 121 96 233 195  
Property and other taxes 101 102 217 204  
Interest expense 51 47 98 92  
Income tax expense (benefit) 12 16 34 35  
Add: Other 6 4 11 10  
Segment income (loss) 64 77 164 171  
Net income     164 171  
Capital investments expenditures and acquisitions     471 417  
Total Assets 12,996 12,601 12,996 12,601 12,768
Duke Energy Ohio | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 161 132 310 270  
Duke Energy Ohio | Cost of natural gas          
Less:          
Cost of sales 35 21 136 82  
Duke Energy Indiana          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 821 747 1,679 1,506  
Less:          
Cost of sales 219 223 479 494  
Operation, maintenance and other 192 161 387 341  
Depreciation and amortization 222 172 414 341  
Property and other taxes 17 16 35 30  
Interest expense 57 58 116 115  
Income tax expense (benefit) 18 22 36 36  
Add: Other 21 15 31 28  
Segment income (loss) 117 110 243 177  
Net income     243 177  
Capital investments expenditures and acquisitions     526 489  
Total Assets 16,180 15,649 16,180 15,649 15,727
Duke Energy Indiana | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 219 223 479 494  
Piedmont          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 335 244 1,192 920  
Less:          
Cost of sales 124 58 396 228  
Operation, maintenance and other 103 85 199 180  
Depreciation and amortization 71 64 141 126  
Property and other taxes 19 16 37 31  
Interest expense 48 43 95 88  
Income tax expense (benefit) (8) (1) 68 59  
Equity in earnings of unconsolidated affiliates 1 2 3 4  
Add: Other 11 15 22 30  
Segment income (loss) (10) (4) 281 242  
Net income (10) (4) 281 242  
Capital investments expenditures and acquisitions     380 571  
Total Assets 11,931 11,301 11,931 11,301 $ 11,799
Piedmont | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 124 58 396 228  
Other          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 7 11 15 18  
Less:          
Operation, maintenance and other (23) (8) (21) (26)  
Depreciation and amortization 77 73 154 144  
Property and other taxes 3 4 6 7  
Impairment of assets and other charges 5 1 5 1  
Interest expense 318 306 636 600  
Income tax expense (benefit) (77) (77) (164) (141)  
Noncontrolling interests 0 0 0 0  
Preferred dividends 13 14 27 53  
Equity in earnings of unconsolidated affiliates 9 19 15 36  
Add: Other 39 54 58 121  
Segment income (loss) (228) (200) (488) (403)  
Capital investments expenditures and acquisitions     156 140  
Total Assets 3,988 4,205 3,988 4,205  
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 40 82 78  
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 12 10 22 21  
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) (3) (5) (5)  
Add: Other (1) (1) (1) (1)  
Segment income (loss) (10) (8) (18) (17)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 264 214 264 214  
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 3 5 8 9  
Less:          
Operation, maintenance and other 15 17 30 29  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 (1) 0 0  
Impairment of assets and other charges   0   0  
Interest expense 28 28 57 57  
Income tax expense (benefit) (13) (10) (21) (19)  
Add: Other 5 10 5 18  
Segment income (loss) (22) (19) (53) (40)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 4,822 3,844 4,822 3,844  
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 7 6 14 12  
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) (1) 0 (3) (2)  
Add: Other 0 1 (2) 2  
Segment income (loss) (6) (5) (13) (8)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 1,072 99 1,072 99  
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 5 5 9 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) 0 0 (2) (2)  
Add: Other 1 2 (2) 2  
Segment income (loss) (4) (3) (9) (5)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 89 20 89 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 3 4 4  
Depreciation and amortization (1) 0 (1) 0  
Property and other taxes 0 0 0 0  
Interest expense 1 (2) 1 (1)  
Income tax expense (benefit) 0 (1) (1) (1)  
Add: Other 0 (1) (1) (1)  
Segment income (loss) (1) (1) (4) (3)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 36 178 36 178  
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 3 0 5 2  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 0 0 0  
Interest expense 1 0 0 0  
Income tax expense (benefit) (2) 0 (2) 0  
Add: Other (1) (1) (1) (1)  
Segment income (loss) (3) (1) (4) (3)  
Capital investments expenditures and acquisitions     0 0  
Total Assets 240 59 240 59  
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 2 2 4 2  
Depreciation and amortization 0 0 0 0  
Property and other taxes 0 0 0 0  
Interest expense 1 0 1 0  
Income tax expense (benefit) (1) 0 (1) 1  
Equity in earnings of unconsolidated affiliates 1 2 3 4  
Add: Other 0 0 0 0  
Segment income (loss) (1) 0 (1) 1  
Capital investments expenditures and acquisitions     0 0  
Total Assets 87 93 87 93  
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 (33) (29) (67) (60)  
Eliminations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues (70) (69) (143) (141)  
Less:          
Operation, maintenance and other (45) (51) (97) (99)  
Depreciation and amortization (8) (6) (14) (13)  
Property and other taxes 0 0 0 0  
Impairment of assets and other charges (1) 0 (1) 0  
Interest expense (21) (31) (45) (68)  
Income tax expense (benefit) 0 1 0 1  
Noncontrolling interests 0 (1) 0 (1)  
Preferred dividends 0 0 0 0  
Equity in earnings of unconsolidated affiliates 1 1 1 0  
Add: Other (26) (39) (55) (78)  
Segment income (loss) 0 0 0 0  
Capital investments expenditures and acquisitions     0 0  
Total Assets 0 0 0 0  
Eliminations | Fuel used in electric generation and purchased power          
Less:          
Cost of sales (20) (19) (40) (39)  
Eliminations | Cost of natural gas          
Less:          
Cost of sales 0 0 0 0  
Total Reportable Segments          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 7,501 7,161 15,742 14,825  
Total Reportable Segments | Operating Segments          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 7,538 7,201 15,818 14,906  
Less:          
Operation, maintenance and other 1,723 1,379 3,272 2,824  
Depreciation and amortization 1,514 1,342 2,955 2,665  
Property and other taxes 412 389 837 772  
Impairment of assets and other charges (1) 42 (1) 43  
Interest expense 600 549 1,195 1,109  
Income tax expense (benefit) 196 216 476 458  
Noncontrolling interests 23 22 48 35  
Preferred dividends 0 0 0 0  
Equity in earnings of unconsolidated affiliates 1 1 6 2  
Add: Other 184 158 332 311  
Segment income (loss) 1,200 1,096 2,825 2,401  
Capital investments expenditures and acquisitions     6,272 6,072  
Total Assets 185,725 177,370 185,725 177,370  
Total Reportable Segments | Operating Segments | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 1,898 2,247 4,017 4,602  
Total Reportable Segments | Operating Segments | Cost of natural gas          
Less:          
Cost of sales 158 78 532 310  
Total Reportable Segments | Operating Segments | Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 654 608 1,420 1,286  
Less:          
Operation, maintenance and other 114 118 235 243  
Depreciation and amortization 122 96 234 195  
Property and other taxes 101 102 217 204  
Interest expense 50 49 97 93  
Income tax expense (benefit) 12 17 35 36  
Add: Other 6 5 12 11  
Segment income (loss) 65 78 168 174  
Capital investments expenditures and acquisitions     471 417  
Total Assets 12,960 12,423 12,960 12,423  
Total Reportable Segments | Operating Segments | Duke Energy Ohio | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 161 132 310 270  
Total Reportable Segments | Operating Segments | Duke Energy Ohio | Cost of natural gas          
Less:          
Cost of sales 35 21 136 82  
Total Reportable Segments | Eliminations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues (37) (40) (76) (81)  
Electric Utilities and Infrastructure          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 7,030 6,802 14,155 13,587  
Electric Utilities and Infrastructure | Operating Segments          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 7,045 6,820 14,185 13,623  
Less:          
Operation, maintenance and other 1,594 1,262 3,018 2,578  
Depreciation and amortization 1,402 1,246 2,736 2,471  
Property and other taxes 371 351 749 688  
Impairment of assets and other charges (1) 42 (1) 43  
Interest expense 535 488 1,065 987  
Income tax expense (benefit) 200 214 389 387  
Noncontrolling interests 23 22 48 35  
Preferred dividends 0 0 0 0  
Equity in earnings of unconsolidated affiliates 0 1 0 2  
Add: Other 171 141 306 277  
Segment income (loss) 1,194 1,090 2,470 2,111  
Capital investments expenditures and acquisitions     5,724 5,349  
Total Assets 167,420 159,770 167,420 159,770  
Electric Utilities and Infrastructure | Operating Segments | South Carolina rate case order          
Less:          
Operation, maintenance and other   2   2  
Impairment of assets and other charges   42   42  
Interest expense   (11)   (11)  
Electric Utilities and Infrastructure | Operating Segments | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 1,898 2,247 4,017 4,602  
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 2,231 2,297 4,755 4,704  
Less:          
Operation, maintenance and other 488 434 962 874  
Depreciation and amortization 482 437 914 834  
Property and other taxes 85 89 187 183  
Impairment of assets and other charges (1) 33 (1) 34  
Interest expense 200 168 400 348  
Income tax expense (benefit) 39 51 92 109  
Add: Other 68 63 129 125  
Segment income (loss) 435 399 956 838  
Capital investments expenditures and acquisitions     2,145 1,949  
Total Assets 56,335 53,160 56,335 53,160  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Carolinas | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 571 749 1,374 1,609  
Electric Utilities and Infrastructure | Operating Segments | Progress Energy          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 3,566 3,352 7,028 6,576  
Less:          
Operation, maintenance and other 828 571 1,501 1,187  
Depreciation and amortization 609 568 1,240 1,155  
Property and other taxes 175 167 347 324  
Impairment of assets and other charges   9   9  
Interest expense 255 237 501 468  
Income tax expense (benefit) 121 114 239 209  
Add: Other 76 56 137 117  
Segment income (loss) 629 540 1,206 996  
Capital investments expenditures and acquisitions     2,742 2,623  
Total Assets 69,489 65,620 69,489 65,620  
Electric Utilities and Infrastructure | Operating Segments | Progress Energy | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 1,025 1,202 2,131 2,345  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 1,681 1,636 3,699 3,424  
Less:          
Operation, maintenance and other 333 320 724 689  
Depreciation and amortization 319 306 676 645  
Property and other taxes 45 50 105 101  
Impairment of assets and other charges   9   9  
Interest expense 139 123 267 243  
Income tax expense (benefit) 40 39 98 89  
Add: Other 50 36 89 72  
Segment income (loss) 281 228 619 503  
Capital investments expenditures and acquisitions     1,524 1,373  
Total Assets 40,486 38,562 40,486 38,562  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Progress | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 574 597 1,299 1,217  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Florida          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 1,885 1,716 3,329 3,152  
Less:          
Operation, maintenance and other 495 251 777 498  
Depreciation and amortization 290 262 564 510  
Property and other taxes 130 117 242 223  
Interest expense 116 114 234 225  
Income tax expense (benefit) 81 75 141 120  
Add: Other 26 20 48 45  
Segment income (loss) 348 312 587 493  
Capital investments expenditures and acquisitions     1,218 1,251  
Total Assets 29,003 27,058 29,003 27,058  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Florida | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 451 605 832 1,128  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 498 476 985 934  
Less:          
Operation, maintenance and other 87 88 179 181  
Depreciation and amortization 83 65 159 131  
Property and other taxes 80 80 166 151  
Interest expense 32 32 63 61  
Income tax expense (benefit) 9 13 18 23  
Add: Other 4 3 8 7  
Segment income (loss) 50 69 98 124  
Capital investments expenditures and acquisitions     303 273  
Total Assets 8,378 8,034 8,378 8,034  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Ohio | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 161 132 310 270  
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 821 747 1,679 1,506  
Less:          
Operation, maintenance and other 189 161 382 339  
Depreciation and amortization 222 172 414 341  
Property and other taxes 17 16 35 30  
Interest expense 56 58 116 115  
Income tax expense (benefit) 20 22 38 36  
Add: Other 22 16 32 29  
Segment income (loss) 120 111 247 180  
Capital investments expenditures and acquisitions     526 489  
Total Assets 15,940 15,590 15,940 15,590  
Electric Utilities and Infrastructure | Operating Segments | Duke Energy Indiana | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 219 223 479 494  
Electric Utilities and Infrastructure | Eliminations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues (15) (18) (30) (36)  
Gas Utilities and Infrastructure          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 471 359 1,587 1,238  
Gas Utilities and Infrastructure | Operating Segments          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 493 381 1,633 1,283  
Less:          
Operation, maintenance and other 129 117 254 246  
Depreciation and amortization 112 96 219 194  
Property and other taxes 41 38 88 84  
Impairment of assets and other charges 0 0 0 0  
Interest expense 65 61 130 122  
Income tax expense (benefit) (4) 2 87 71  
Noncontrolling interests 0 0 0 0  
Preferred dividends 0 0 0 0  
Equity in earnings of unconsolidated affiliates 1 0 6 0  
Add: Other 13 17 26 34  
Segment income (loss) 6 6 355 290  
Capital investments expenditures and acquisitions     548 723  
Total Assets 18,305 17,600 18,305 17,600  
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 158 78 532 310  
Gas Utilities and Infrastructure | Operating Segments | Duke Energy Ohio          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 156 132 435 352  
Less:          
Operation, maintenance and other 27 30 56 62  
Depreciation and amortization 39 31 75 64  
Property and other taxes 21 22 51 53  
Interest expense 18 17 34 32  
Income tax expense (benefit) 3 4 17 13  
Add: Other 2 2 4 4  
Segment income (loss) 15 9 70 50  
Capital investments expenditures and acquisitions     168 144  
Total Assets 4,582 4,389 4,582 4,389  
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 35 21 136 82  
Gas Utilities and Infrastructure | Operating Segments | Piedmont          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues 335 244 1,192 920  
Less:          
Operation, maintenance and other 101 83 195 178  
Depreciation and amortization 71 64 141 126  
Property and other taxes 19 16 37 31  
Interest expense 47 43 94 88  
Income tax expense (benefit) (7) (1) 69 58  
Equity in earnings of unconsolidated affiliates 0 0 0 0  
Add: Other 11 15 22 30  
Segment income (loss) (9) (4) 282 241  
Capital investments expenditures and acquisitions     380 571  
Total Assets 11,844 11,208 11,844 11,208  
Gas Utilities and Infrastructure | Operating Segments | Piedmont | Fuel used in electric generation and purchased power          
Less:          
Cost of sales 124 58 396 228  
Gas Utilities and Infrastructure | Eliminations          
Segment Reporting Information, Profit (Loss) [Abstract]          
Operating Revenues $ (22) $ (22) $ (46) $ (45)