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Income Taxes (Effective Tax Rates) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
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% |  | $ 790 | $ 176 | $ 860
State income tax, net of federal income tax effect |  | 1 | (80) | (22)
Amortization of excess deferred income tax |  | (438) | (276) | (121)
AFUDC equity income |  | (34) | (48) | (52)
AFUDC equity depreciation |  | 35 | 103 | 34
Noncontrolling Interests |  | 72 | 62 |
Renewable energy PTCs |  | (100) | (110) | (120)
Other tax credits |  | (30) | (37) | (23)
Tax true up |  |  | (12) | (64)
Valuation allowance | $ (85) | (85) |  |
Other items, net |  | (19) | (14) | 27
Income tax expense from continuing operations |  | $ 192 | $ (236) | $ 519
Effective tax rate |  | 5.10% | (28.10%) | 12.70%
Federal capital gain | $ 426 |  |  |
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% |  | $ 291 | $ 219 | $ 360
State income tax, net of federal income tax effect |  | (44) | (40) | (19)
Amortization of excess deferred income tax |  | (184) | (82) | (29)
AFUDC equity income |  | (14) | (13) | (9)
AFUDC equity depreciation |  | 18 | 19 | 19
Other tax credits |  | (12) | (13) | (11)
Tax true up |  |  | (3) | (9)
Other items, net |  | (4) | 1 | 9
Income tax expense from continuing operations |  | $ 51 | $ 88 | $ 311
Effective tax rate |  | 3.70% | 8.40% | 18.10%
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% |  | $ 384 | $ 243 | $ 332
State income tax, net of federal income tax effect |  | 34 | 4 | 8
Amortization of excess deferred income tax |  | (174) | (118) | (64)
AFUDC equity income |  | (11) | (9) | (14)
AFUDC equity depreciation |  | 10 | 10 | 10
Other tax credits |  | (11) | (16) | (9)
Tax true up |  |  | 1 | (8)
Other items, net |  | (5) | (2) | (2)
Income tax expense from continuing operations |  | $ 227 | $ 113 | $ 253
Effective tax rate |  | 12.40% | 9.70% | 16.00%
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% |  | $ 224 | $ 80 | $ 202
State income tax, net of federal income tax effect |  | (14) | (25) | (17)
Amortization of excess deferred income tax |  | (120) | (68) | (10)
AFUDC equity income |  | (7) | (6) | (13)
AFUDC equity depreciation |  | 5 | 5 | 5
Other tax credits |  | (8) | (14) | (7)
Tax true up |  |  | (5) | (3)
Other items, net |  | (5) | (3) |
Income tax expense from continuing operations |  | $ 75 | $ (36) | $ 157
Effective tax rate |  | 7.00% | (9.50%) | 16.30%
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% |  | $ 194 | $ 204 | $ 178
State income tax, net of federal income tax effect |  | 47 | 39 | 35
Amortization of excess deferred income tax |  | (54) | (49) | (54)
AFUDC equity income |  | (3) | (3) | (1)
AFUDC equity depreciation |  | 5 | 5 | 5
Other tax credits |  | (3) | (2) | (2)
Tax true up |  |  | 5 | (5)
Other items, net |  | 1 | (1) | (1)
Income tax expense from continuing operations |  | $ 187 | $ 198 | $ 155
Effective tax rate |  | 20.20% | 20.40% | 18.30%
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% |  | $ 49 | $ 62 | $ 59
State income tax, net of federal income tax effect |  | 2 | 2 | 3
Amortization of excess deferred income tax |  | (22) | (20) | (12)
AFUDC equity income |  | (2) | (2) | (3)
AFUDC equity depreciation |  | 2 | 1 | 1
Other tax credits |  | (1) | (1) | (1)
Tax true up |  |  |  | (7)
Other items, net |  | 2 | 1 |
Income tax expense from continuing operations |  | $ 30 | $ 43 | $ 40
Effective tax rate |  | 12.80% | 14.60% | 14.30%
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% |  | $ 123 | $ 103 | $ 120
State income tax, net of federal income tax effect |  | 18 | 19 | 22
Amortization of excess deferred income tax |  | (34) | (36) | (6)
AFUDC equity income |  | (4) | (4) | (3)
AFUDC equity depreciation |  | 5 | 4 | 4
Other tax credits |  | (2) | (3) | (1)
Tax true up |  |  | (1) | (1)
Other items, net |  | 1 | 2 | (1)
Income tax expense from continuing operations |  | $ 107 | $ 84 | $ 134
Effective tax rate |  | 18.20% | 17.10% | 23.50%
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% |  | $ 71 | $ 61 | $ 51
State income tax, net of federal income tax effect |  | (8) | (12) | 2
Amortization of excess deferred income tax |  | (25) | (21) | (10)
AFUDC equity income |  | (4) | (10) |
Other tax credits |  | (4) | (2) | (1)
Tax true up |  |  | 1 |
Other items, net |  |  | 1 | 1
Income tax expense from continuing operations |  | $ 30 | $ 18 | $ 43
Effective tax rate |  | 8.80% | 6.20% | 17.60%

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