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Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current federal taxes | $ (299) | $ (647) | $ (247)
Current state taxes | 10 | (11) | 4
Current foreign taxes | 2 | 3 | 3
Total current income taxes | (287) | (655) | (240)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred federal taxes | 855 | 1,064 | 1,344
Deferred state taxes | (38) | 49 | 102
Total deferred income taxes | 817 | 1,113 | 1,446
ITC amortization | (11) | (10) | (10)
Income tax expense (benefit) from continuing operations | 519 | 448 | 1,196
Tax expense (benefit) from discontinued operations | (2) | (26) | (6)
Total income tax expense included in Consolidated Statements of Operations | 517 | 422 | 1,190
Net operating loss carry forward | (775) | (18) | 428
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Domestic | 4,053 | 3,018 | 4,207
Foreign | 44 | 55 | 59
Total income from continuing operations before income taxes | 4,097 | 3,073 | 4,266
Equity in losses of unconsolidated affiliates | (162) | (83) | (119)
Duke Energy Carolinas |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current federal taxes | 164 | (8) | 221
Current state taxes | 13 | 6 | 20
Current foreign taxes |  | 0 | 0
Total current income taxes | 177 | (2) | 241
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred federal taxes | 175 | 299 | 381
Deferred state taxes | (37) | 11 | 35
Total deferred income taxes | 138 | 310 | 416
ITC amortization | (4) | (5) | (5)
Income tax expense (benefit) from continuing operations | 311 | 303 | 652
Tax expense (benefit) from discontinued operations |  | 0 | 0
Total income tax expense included in Consolidated Statements of Operations | 311 | 303 | 652
Net operating loss carry forward | 8 | 22 | 10
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Total income from continuing operations before income taxes | 1,714 | 1,374 | 1,866
Progress Energy |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current federal taxes | (173) | (135) | (436)
Current state taxes | (7) | (5) | (5)
Current foreign taxes |  | 0 | 0
Total current income taxes | (180) | (140) | (441)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred federal taxes | 422 | 341 | 664
Deferred state taxes | 17 | 20 | 44
Total deferred income taxes | 439 | 361 | 708
ITC amortization | (6) | (3) | (3)
Income tax expense (benefit) from continuing operations | 253 | 218 | 264
Tax expense (benefit) from discontinued operations |  | 0 | 0
Total income tax expense included in Consolidated Statements of Operations | 253 | 218 | 264
Net operating loss carry forward | (243) | (293) | (74)
Duke Energy Progress |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current federal taxes | (36) | (71) | (95)
Current state taxes | (3) | (5) | 2
Current foreign taxes |  | 0 | 0
Total current income taxes | (39) | (76) | (93)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred federal taxes | 220 | 256 | 378
Deferred state taxes | (18) | (17) | 10
Total deferred income taxes | 202 | 239 | 388
ITC amortization | (6) | (3) | (3)
Income tax expense (benefit) from continuing operations | 157 | 160 | 292
Tax expense (benefit) from discontinued operations |  | 0 | 0
Total income tax expense included in Consolidated Statements of Operations | 157 | 160 | 292
Net operating loss carry forward | 35 | 59 | 1
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Total income from continuing operations before income taxes | 962 | 827 | 1,007
Duke Energy Florida |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current federal taxes | (43) | (49) | (188)
Current state taxes | 18 | (10) | (11)
Current foreign taxes |  | 0 | 0
Total current income taxes | (25) | (59) | (199)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred federal taxes | 153 | 115 | 194
Deferred state taxes | 27 | 45 | 51
Total deferred income taxes | 180 | 160 | 245
ITC amortization |  | 0 | 0
Income tax expense (benefit) from continuing operations | 155 | 101 | 46
Tax expense (benefit) from discontinued operations |  | 0 | 0
Total income tax expense included in Consolidated Statements of Operations | 155 | 101 | 46
Net operating loss carry forward | (152) | (219) | (36)
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Total income from continuing operations before income taxes | 847 | 655 | 758
Duke Energy Ohio |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current federal taxes | (41) | 20 | (37)
Current state taxes | (1) | (1) | 2
Current foreign taxes |  | 0 | 0
Total current income taxes | (42) | 19 | (35)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred federal taxes | 77 | 21 | 99
Deferred state taxes | 5 | 3 | (4)
Total deferred income taxes | 82 | 24 | 95
ITC amortization |  | 0 | (1)
Income tax expense (benefit) from continuing operations | 40 | 43 | 59
Tax expense (benefit) from discontinued operations |  | 0 | 0
Total income tax expense included in Consolidated Statements of Operations | 40 | 43 | 59
Net operating loss carry forward | (25) | (17) | (17)
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Total income from continuing operations before income taxes | 279 | 219 | 252
Duke Energy Indiana |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current federal taxes | (23) | 29 | 128
Current state taxes | 1 | 3 | 21
Current foreign taxes |  | 0 | 0
Total current income taxes | (22) | 32 | 149
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred federal taxes | 128 | 74 | 138
Deferred state taxes | 28 | 22 | 14
Total deferred income taxes | 156 | 96 | 152
ITC amortization |  | 0 | 0
Income tax expense (benefit) from continuing operations | 134 | 128 | 301
Tax expense (benefit) from discontinued operations |  | 0 | 0
Total income tax expense included in Consolidated Statements of Operations | 134 | 128 | 301
Net operating loss carry forward | (60) | (21) | (42)
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Total income from continuing operations before income taxes | 570 | 521 | 655
Piedmont |  |  |
Current Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Current federal taxes | (92) | 67 | (90)
Current state taxes | (1) | 1 | (3)
Current foreign taxes |  | 0 | 0
Total current income taxes | (93) | 68 | (93)
Deferred Income Tax Expense (Benefit), Continuing Operations [Abstract] |  |  |
Deferred federal taxes | 133 | (36) | 147
Deferred state taxes | 3 | 5 | 8
Total deferred income taxes | 136 | (31) | 155
ITC amortization |  | 0 | 0
Income tax expense (benefit) from continuing operations | 43 | 37 | 62
Tax expense (benefit) from discontinued operations |  | 0 | 0
Total income tax expense included in Consolidated Statements of Operations | 43 | 37 | 62
Net operating loss carry forward | (90) | (39) | (79)
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Total income from continuing operations before income taxes | 245 | 166 | 201
Equity in losses of unconsolidated affiliates | $ (8) | $ (7) | 6
Tax Act |  |  |
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Equity in losses of unconsolidated affiliates |  |  | $ 16

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