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Income Taxes (Effective Tax Rates) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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 of 21% | $ 176 | $ 860 | $ 645
State income tax, net of federal income tax effect | (80) | (22) | 30
Amortization of excess deferred income tax | (276) | (121) | (61)
AFUDC equity income | (48) | (52) | (42)
AFUDC equity depreciation | 103 | 34 | 31
Noncontrolling Interests | 62 |  |
Renewable energy PTCs | (110) | (120) | (129)
Other tax credits | (37) | (23) | (28)
Tax Act |  |  | 20
Tax true up | (12) | (64) |
Other items, net | (14) | 27 | (18)
Income tax (benefit) expense from continuing operations | $ (236) | $ 519 | $ 448
Effective tax rate | (28.10%) | 12.70% | 14.60%
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 of 21% | $ 219 | $ 360 | $ 288
State income tax, net of federal income tax effect | (40) | (19) | 14
Amortization of excess deferred income tax | (82) | (29) |
AFUDC equity income | (13) | (9) | (15)
AFUDC equity depreciation | 19 | 19 | 18
Other tax credits | (13) | (11) | (7)
Tax Act |  |  | 1
Tax true up | (3) | (9) |
Other items, net | 1 | 9 | 4
Income tax (benefit) expense from continuing operations | $ 88 | $ 311 | $ 303
Effective tax rate | 8.40% | 18.10% | 22.10%
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 of 21% | $ 243 | $ 332 | $ 263
State income tax, net of federal income tax effect | 4 | 8 | 13
Amortization of excess deferred income tax | (118) | (64) | (55)
AFUDC equity income | (9) | (14) | (22)
AFUDC equity depreciation | 10 | 10 | 9
Other tax credits | (16) | (9) | (13)
Tax Act |  |  | 25
Tax true up | 1 | (8) |
Other items, net | (2) | (2) | (2)
Income tax (benefit) expense from continuing operations | $ 113 | $ 253 | $ 218
Effective tax rate | 9.70% | 16.00% | 17.40%
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 of 21% | $ 80 | $ 202 | $ 174
State income tax, net of federal income tax effect | (25) | (17) | (17)
Amortization of excess deferred income tax | (68) | (10) | (1)
AFUDC equity income | (6) | (13) | (12)
AFUDC equity depreciation | 5 | 5 | 5
Other tax credits | (14) | (7) | (5)
Tax Act |  |  | 19
Tax true up | (5) | (3) |
Other items, net | (3) | 0 | (3)
Income tax (benefit) expense from continuing operations | $ (36) | $ 157 | $ 160
Effective tax rate | (9.50%) | 16.30% | 19.30%
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 of 21% | $ 204 | $ 178 | $ 137
State income tax, net of federal income tax effect | 39 | 35 | 28
Amortization of excess deferred income tax | (49) | (54) | (54)
AFUDC equity income | (3) | (1) | (10)
AFUDC equity depreciation | 5 | 5 | 4
Other tax credits | (2) | (2) | (8)
Tax Act |  |  | 0
Tax true up | 5 | (5) |
Other items, net | (1) | (1) | 4
Income tax (benefit) expense from continuing operations | $ 198 | $ 155 | $ 101
Effective tax rate | 20.40% | 18.30% | 15.40%
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 of 21% | $ 62 | $ 59 | $ 46
State income tax, net of federal income tax effect | 2 | 3 | 2
Amortization of excess deferred income tax | (20) | (12) | (3)
AFUDC equity income | (2) | (3) | (2)
AFUDC equity depreciation | 1 | 1 | 1
Other tax credits | (1) | (1) | (1)
Tax Act |  |  | 2
Tax true up | 0 | (7) |
Other items, net | 1 | 0 | (2)
Income tax (benefit) expense from continuing operations | $ 43 | $ 40 | $ 43
Effective tax rate | 14.60% | 14.30% | 19.60%
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 of 21% | $ 103 | $ 120 | $ 109
State income tax, net of federal income tax effect | 19 | 22 | 20
Amortization of excess deferred income tax | (36) | (6) | (2)
AFUDC equity income | (4) | (3) | (2)
AFUDC equity depreciation | 4 | 4 | 4
Noncontrolling Interests | 0 |  |
Other tax credits | (3) | (1) | (1)
Tax true up | (1) | (1) |
Other items, net | 2 | (1) |
Income tax (benefit) expense from continuing operations | $ 84 | $ 134 | $ 128
Effective tax rate | 17.10% | 23.50% | 24.60%
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 of 21% | $ 61 | $ 51 | $ 35
State income tax, net of federal income tax effect | (12) | 2 | 4
Amortization of excess deferred income tax | (21) | (10) |
AFUDC equity income | (10) |  |
Other tax credits | (2) | (1) | (3)
Tax true up | 1 | 0 |
Other items, net | 1 | 1 | 1
Income tax (benefit) expense from continuing operations | $ 18 | $ 43 | $ 37
Effective tax rate | 6.20% | 17.60% | 22.30%

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