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Income Taxes (Effective Tax Rates) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |
Income tax expense, computed at the statutory rate | $ 860 | $ 645 | $ 1,493
State income tax, net of federal income tax effect | (22) | 30 | 69
Amortization of excess deferred income tax | (121) | (61) |
AFUDC equity income | (52) | (42) | (81)
AFUDC equity depreciation | 34 | 31 |
Renewable energy PTCs | (120) | (129) | (132)
Other tax credits | (23) | (28) |
Tax Act |  | 20 | (112)
Tax true up | (64) |  | (52)
Other items, net | 27 | (18) | 11
Income tax expense (benefit) from continuing operations | $ 519 | $ 448 | $ 1,196
Effective tax rate | 12.70% | 14.60% | 28.00%
Duke Energy Carolinas |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |
Income tax expense, computed at the statutory rate | $ 360 | $ 288 | $ 653
State income tax, net of federal income tax effect | (19) | 14 | 36
Amortization of excess deferred income tax | (29) |  |
AFUDC equity income | (9) | (15) | (37)
AFUDC equity depreciation | 19 | 18 |
Other tax credits | (11) | (7) |
Tax Act |  | 1 | 15
Tax true up | (9) |  | (24)
Other items, net | 9 | 4 | 9
Income tax expense (benefit) from continuing operations | $ 311 | $ 303 | $ 652
Effective tax rate | 18.10% | 22.10% | 34.90%
Progress Energy |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |
Income tax expense, computed at the statutory rate | $ 332 | $ 263 | $ 536
State income tax, net of federal income tax effect | 8 | 13 | 25
Amortization of excess deferred income tax | (64) | (55) |
AFUDC equity income | (14) | (22) | (32)
AFUDC equity depreciation | 10 | 9 |
Other tax credits | (9) | (13) |
Tax Act |  | 25 | (246)
Tax true up | (8) |  | (19)
Other items, net | (2) | (2) |
Income tax expense (benefit) from continuing operations | $ 253 | $ 218 | $ 264
Effective tax rate | 16.00% | 17.40% | 17.20%
Duke Energy Progress |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |
Income tax expense, computed at the statutory rate | $ 202 | $ 174 | $ 353
State income tax, net of federal income tax effect | (17) | (17) | 8
Amortization of excess deferred income tax | (10) | (1) |
AFUDC equity income | (13) | (12) | (17)
AFUDC equity depreciation | 5 | 5 |
Other tax credits | (7) | (5) |
Tax Act |  | 19 | (40)
Tax true up | (3) |  | (13)
Other items, net |  | (3) | 1
Income tax expense (benefit) from continuing operations | $ 157 | $ 160 | $ 292
Effective tax rate | 16.30% | 19.30% | 29.00%
Duke Energy Florida |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |
Income tax expense, computed at the statutory rate | $ 178 | $ 137 | $ 265
State income tax, net of federal income tax effect | 35 | 28 | 26
Amortization of excess deferred income tax | (54) | (54) |
AFUDC equity income | (1) | (10) | (16)
AFUDC equity depreciation | 5 | 4 |
Other tax credits | (2) | (8) |
Tax Act |  |  | (226)
Tax true up | (5) |  | (7)
Other items, net | (1) | 4 | 4
Income tax expense (benefit) from continuing operations | $ 155 | $ 101 | $ 46
Effective tax rate | 18.30% | 15.40% | 6.10%
Duke Energy Ohio |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |
Income tax expense, computed at the statutory rate | $ 59 | $ 46 | $ 88
State income tax, net of federal income tax effect | 3 | 2 | (1)
Amortization of excess deferred income tax | (12) | (3) |
AFUDC equity income | (3) | (2) | (4)
AFUDC equity depreciation | 1 | 1 |
Other tax credits | (1) | (1) |
Tax Act |  | 2 | (23)
Tax true up | (7) |  | (5)
Other items, net | 0 | (2) | 4
Income tax expense (benefit) from continuing operations | $ 40 | $ 43 | $ 59
Effective tax rate | 14.30% | 19.60% | 23.40%
Duke Energy Indiana |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |
Income tax expense, computed at the statutory rate | $ 120 | $ 109 | $ 229
State income tax, net of federal income tax effect | 22 | 20 | 23
Amortization of excess deferred income tax | (6) | (2) |
AFUDC equity income | (3) | (2) | (8)
AFUDC equity depreciation | 4 | 4 |
Other tax credits | (1) | (1) |
Tax Act |  |  | 55
Tax true up | (1) |  | (6)
Other items, net | (1) |  | 8
Income tax expense (benefit) from continuing operations | $ 134 | $ 128 | $ 301
Effective tax rate | 23.50% | 24.60% | 46.00%
Piedmont |  |  |
Reconciliation of Income Tax Expense at the U.S. Federal Statutory Tax Rate to the Actual Tax Expense from Continuing Operations [Abstract] |  |  |
Income tax expense, computed at the statutory rate | $ 51 | $ 35 | $ 70
State income tax, net of federal income tax effect | 2 | 4 | 3
Amortization of excess deferred income tax | (10) |  |
Other tax credits | (1) | (3) |
Tax Act |  |  | (12)
Other items, net | 1 | 1 | 1
Income tax expense (benefit) from continuing operations | $ 43 | $ 37 | $ 62
Effective tax rate | 17.60% | 22.30% | 30.80%

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