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Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions | 2 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Oct. 31, 2016
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Current federal taxes |  | $ (647) | $ (247) |  |
Current state taxes |  | (11) | 4 | $ (15) |
Current foreign taxes |  | 3 | 3 | 2 |
Total current income taxes |  | (655) | (240) | (13) |
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Deferred federal taxes |  | 1,064 | 1,344 | 1,064 |
Deferred state taxes |  | 49 | 102 | 117 |
Total deferred income taxes |  | 1,113 | 1,446 | 1,181 |
Investment tax credit amortization |  | (10) | (10) | (12) |
Income tax expense (benefit) from continuing operations |  | 448 | 1,196 | 1,156 |
Tax expense (benefit) from discontinued operations |  | (26) | (6) | (30) |
Total income tax expense included in Consolidated Statements of Operations |  | 422 | 1,190 | 1,126 |
Net operating loss carry forward |  | (18) | 428 | 648 |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Domestic |  | 3,018 | 4,207 | 3,689 |
Foreign |  | 55 | 59 | 45 |
Total income from continuing operations before income taxes |  | 3,073 | 4,266 | 3,734 |
Equity in losses of unconsolidated affiliates |  | (83) | (119) | 15 |
Tax Act [Member] |  |  |  |  |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Equity in losses of unconsolidated affiliates |  | 16 |  |  |
Duke Energy Carolinas [Member] |  |  |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Current federal taxes |  | (8) | 221 | 139 |
Current state taxes |  | 6 | 20 | 25 |
Total current income taxes |  | (2) | 241 | 164 |
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Deferred federal taxes |  | 299 | 381 | 430 |
Deferred state taxes |  | 11 | 35 | 45 |
Total deferred income taxes |  | 310 | 416 | 475 |
Investment tax credit amortization |  | (5) | (5) | (5) |
Income tax expense (benefit) from continuing operations |  | 303 | 652 | 634 |
Total income tax expense included in Consolidated Statements of Operations |  | 303 | 652 | 634 |
Net operating loss carry forward |  | 22 | 10 | (4) |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Total income from continuing operations before income taxes |  | 1,374 | 1,866 | 1,800 |
Progress Energy [Member] |  |  |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Current federal taxes |  | (135) | (436) | 15 |
Current state taxes |  | (5) | (5) | (19) |
Total current income taxes |  | (140) | (441) | (4) |
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Deferred federal taxes |  | 341 | 664 | 486 |
Deferred state taxes |  | 20 | 44 | 50 |
Total deferred income taxes |  | 361 | 708 | 536 |
Investment tax credit amortization |  | (3) | (3) | (5) |
Income tax expense (benefit) from continuing operations |  | 218 | 264 | 527 |
Tax expense (benefit) from discontinued operations |  |  |  | 1 |
Total income tax expense included in Consolidated Statements of Operations |  | 218 | 264 | 528 |
Net operating loss carry forward |  | (293) | (74) | (190) |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Total income from continuing operations before income taxes |  | 1,251 | 1,532 | 1,566 |
Duke Energy Progress [Member] |  |  |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Current federal taxes |  | (71) | (95) | (59) |
Current state taxes |  | (5) | 2 | (25) |
Total current income taxes |  | (76) | (93) | (84) |
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Deferred federal taxes |  | 256 | 378 | 350 |
Deferred state taxes |  | (17) | 10 | 40 |
Total deferred income taxes |  | 239 | 388 | 390 |
Investment tax credit amortization |  | (3) | (3) | (5) |
Income tax expense (benefit) from continuing operations |  | 160 | 292 | 301 |
Total income tax expense included in Consolidated Statements of Operations |  | 160 | 292 | 301 |
Net operating loss carry forward |  | 59 | 1 | (60) |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Total income from continuing operations before income taxes |  | 827 | 1,007 | 900 |
Duke Energy Florida [Member] |  |  |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Current federal taxes |  | (49) | (188) | 76 |
Current state taxes |  | (10) | (11) | 22 |
Total current income taxes |  | (59) | (199) | 98 |
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Deferred federal taxes |  | 115 | 194 | 199 |
Deferred state taxes |  | 45 | 51 | 25 |
Total deferred income taxes |  | 160 | 245 | 224 |
Income tax expense (benefit) from continuing operations |  | 101 | 46 | 322 |
Total income tax expense included in Consolidated Statements of Operations |  | 101 | 46 | 322 |
Net operating loss carry forward |  | (219) | (36) | (49) |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Total income from continuing operations before income taxes |  | 655 | 758 | 873 |
Duke Energy Ohio [Member] |  |  |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Current federal taxes |  | 20 | (37) | (7) |
Current state taxes |  | (1) | 2 | (13) |
Total current income taxes |  | 19 | (35) | (20) |
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Deferred federal taxes |  | 21 | 99 | 88 |
Deferred state taxes |  | 3 | (4) | 11 |
Total deferred income taxes |  | 24 | 95 | 99 |
Investment tax credit amortization |  |  | (1) | (1) |
Income tax expense (benefit) from continuing operations |  | 43 | 59 | 78 |
Tax expense (benefit) from discontinued operations |  |  |  | (36) |
Total income tax expense included in Consolidated Statements of Operations |  | 43 | 59 | 42 |
Net operating loss carry forward |  | (17) | (17) | (26) |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Total income from continuing operations before income taxes |  | 219 | 252 | 270 |
Duke Energy Indiana [Member] |  |  |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Current federal taxes |  | 29 | 128 | 7 |
Current state taxes |  | 3 | 21 | 6 |
Total current income taxes |  | 32 | 149 | 13 |
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Deferred federal taxes |  | 74 | 138 | 202 |
Deferred state taxes |  | 22 | 14 | 11 |
Total deferred income taxes |  | 96 | 152 | 213 |
Investment tax credit amortization |  |  |  | (1) |
Income tax expense (benefit) from continuing operations |  | 128 | 301 | 225 |
Total income tax expense included in Consolidated Statements of Operations |  | 128 | 301 | 225 |
Net operating loss carry forward |  | (21) | (42) | (58) |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Total income from continuing operations before income taxes |  | 521 | 655 | $ 606 |
Piedmont Natural Gas [Member] |  |  |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Current federal taxes | $ 4 | 67 | (90) |  | $ 27
Current state taxes | (2) | 1 | (3) |  | 12
Total current income taxes | 2 | 68 | (93) |  | 39
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Deferred federal taxes | 24 | (36) | 147 |  | 79
Deferred state taxes | 6 | 5 | 8 |  | 6
Total deferred income taxes | 30 | (31) | 155 |  | 85
Income tax expense (benefit) from continuing operations | 32 | 37 | 62 |  | 124
Total income tax expense included in Consolidated Statements of Operations |  | 37 | 62 |  |
Net operating loss carry forward | 17 | (39) | (79) |  | 91
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |  |  |
Total income from continuing operations before income taxes | 86 | 166 | 201 |  | 317
Equity in losses of unconsolidated affiliates | $ (2) | $ (7) | 6 |  | $ (29)
Previously Remitted Earnings [Member] |  |  |  |  |
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |  |  |
Tax expense (benefit) from discontinued operations |  |  | $ (95) |  |

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