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Income Taxes (Effective Tax Rates) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2021 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
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% |  | $ 856 | $ 838 | $ 193
State income tax, net of federal income tax effect |  | (17) | 1 | (80)
Amortization of excess deferred income tax |  | (481) | (438) | (276)
AFUDC equity income |  | (41) | (34) | (48)
AFUDC equity depreciation |  | 36 | 35 | 103
Other tax credits |  | (43) | (30) | (37)
Tax true up |  |  |  | (12)
Valuation allowance | $ (85) |  | (85) |
Other items, net |  | (10) | (19) | (12)
Income tax expense from continuing operations |  | $ 300 | $ 268 | $ (169)
Effective tax rate |  | 7.40% | 6.70% | (18.40%)
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% |  | $ 362 | $ 291 | $ 219
State income tax, net of federal income tax effect |  | (23) | (44) | (40)
Amortization of excess deferred income tax |  | (195) | (184) | (82)
AFUDC equity income |  | (20) | (14) | (13)
AFUDC equity depreciation |  | 18 | 18 | 19
Other tax credits |  | (12) | (12) | (13)
Tax true up |  |  |  | (3)
Other items, net |  | (4) | (4) | 1
Income tax expense from continuing operations |  | $ 126 | $ 51 | $ 88
Effective tax rate |  | 7.30% | 3.70% | 8.40%
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% |  | $ 457 | $ 384 | $ 243
State income tax, net of federal income tax effect |  | 44 | 34 | 4
Amortization of excess deferred income tax |  | (133) | (174) | (118)
AFUDC equity income |  | (14) | (11) | (9)
AFUDC equity depreciation |  | 12 | 10 | 10
Other tax credits |  | (16) | (11) | (16)
Tax true up |  |  |  | 1
Other items, net |  | (2) | (5) | (2)
Income tax expense from continuing operations |  | $ 348 | $ 227 | $ 113
Effective tax rate |  | 16.00% | 12.40% | 9.70%
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% |  | $ 245 | $ 224 | $ 80
State income tax, net of federal income tax effect |  | 6 | (14) | (25)
Amortization of excess deferred income tax |  | (74) | (120) | (68)
AFUDC equity income |  | (11) | (7) | (6)
AFUDC equity depreciation |  | 6 | 5 | 5
Other tax credits |  | (9) | (8) | (14)
Tax true up |  |  |  | (5)
Other items, net |  | (5) | (5) | (3)
Income tax expense from continuing operations |  | $ 158 | $ 75 | $ (36)
Effective tax rate |  | 13.60% | 7.00% | (9.50%)
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% |  | $ 238 | $ 194 | $ 204
State income tax, net of federal income tax effect |  | 48 | 47 | 39
Amortization of excess deferred income tax |  | (59) | (54) | (49)
AFUDC equity income |  | (3) | (3) | (3)
AFUDC equity depreciation |  | 6 | 5 | 5
Other tax credits |  | (7) | (3) | (2)
Tax true up |  |  |  | 5
Other items, net |  | 2 | 1 | (1)
Income tax expense from continuing operations |  | $ 225 | $ 187 | $ 198
Effective tax rate |  | 19.80% | 20.20% | 20.40%
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% |  | $ 59 | $ 49 | $ 62
State income tax, net of federal income tax effect |  | 3 | 2 | 2
Amortization of excess deferred income tax |  | (79) | (22) | (20)
AFUDC equity income |  | (1) | (2) | (2)
AFUDC equity depreciation |  | 1 | 2 | 1
Other tax credits |  | (2) | (1) | (1)
Other items, net |  | (2) | 2 | 1
Income tax expense from continuing operations |  | $ (21) | $ 30 | $ 43
Effective tax rate |  | (7.50%) | 12.80% | 14.60%
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% |  | $ 24 | $ 123 | $ 103
State income tax, net of federal income tax effect |  | 2 | 18 | 19
Amortization of excess deferred income tax |  | (48) | (34) | (36)
AFUDC equity income |  | (2) | (4) | (4)
AFUDC equity depreciation |  | 4 | 5 | 4
Other tax credits |  | (3) | (2) | (3)
Tax true up |  |  |  | (1)
Other items, net |  | (1) | 1 | 2
Income tax expense from continuing operations |  | $ (24) | $ 107 | $ 84
Effective tax rate |  | (21.20%) | 18.20% | 17.10%
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% |  | $ 76 | $ 71 | $ 61
State income tax, net of federal income tax effect |  | (4) | (8) | (12)
Amortization of excess deferred income tax |  | (23) | (25) | (21)
AFUDC equity income |  | (2) | (4) | (10)
Other tax credits |  | (8) | (4) | (2)
Tax true up |  |  |  | 1
Other items, net |  |  |  | 1
Income tax expense from continuing operations |  | $ 39 | $ 30 | $ 18
Effective tax rate |  | 10.80% | 8.80% | 6.20%

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