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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Schedule of Components of Income Tax Expense (Benefit) | Components of Income Tax Expense
| Year Ended December 31, 2020
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Current income taxes |  |  |  |  |  |  |  |
Federal | $ | (281) |  | $ | 314 |  | $ | 280 |  | $ | 181 |  | $ | 148 |  | $ | 10 |  | $ | 48 |  | $ | (27) |
State | (9) |  | 35 |  | 29 |  | 17 |  | 24 |  | 1 |  | 7 |  | (8) |
Foreign | 1 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total current income taxes | (289) |  | 349 |  | 309 |  | 198 |  | 172 |  | 11 |  | 55 |  | (35) |
Deferred income taxes |  |  |  |  |  |  |  |
Federal | 155 |  | (171) |  | (167) |  | (180) |  | 1 |  | 30 |  | 12 |  | 60 |
State | (92) |  | (86) |  | (24) |  | (49) |  | 25 |  | 2 |  | 17 |  | (7) |
Total deferred income taxes(a) | 63 |  | (257) |  | (191) |  | (229) |  | 26 |  | 32 |  | 29 |  | 53 |
ITC amortization | (10) |  | (4) |  | (5) |  | (5) |  | — |  | — |  | — |  | — |
Income tax (benefit) expense from continuing operations | (236) |  | 88 |  | 113 |  | (36) |  | 198 |  | 43 |  | 84 |  | 18 |
Tax expense from discontinued operations | 2 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total income tax (benefit) expense included in Consolidated Statements of Operations | $ | (234) |  | $ | 88 |  | $ | 113 |  | $ | (36) |  | $ | 198 |  | $ | 43 |  | $ | 84 |  | $ | 18 |
(a) Total deferred income taxes includes the generation of NOL carryforwards and tax credit carryforwards of $20 million at Duke Energy Carolinas, $3 million at Duke Energy Progress, $8 million at Duke Energy Indiana, and $11 million at Piedmont. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $39 million at Progress Energy, $30 million at Duke Energy Florida and $79 million at Duke Energy.
| Year Ended December 31, 2019 |
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Current income taxes |  |  |  |  |  |  |  |
Federal | $ | (299) |  | $ | 164 |  | $ | (173) |  | $ | (36) |  | $ | (43) |  | $ | (41) |  | $ | (23) |  | $ | (92) |
State | 10 |  | 13 |  | (7) |  | (3) |  | 18 |  | (1) |  | 1 |  | (1) |
Foreign | 2 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total current income taxes | (287) |  | 177 |  | (180) |  | (39) |  | (25) |  | (42) |  | (22) |  | (93) |
Deferred income taxes |  |  |  |  |  |  |  |
Federal | 855 |  | 175 |  | 422 |  | 220 |  | 153 |  | 77 |  | 128 |  | 133 |
State | (38) |  | (37) |  | 17 |  | (18) |  | 27 |  | 5 |  | 28 |  | 3 |
Total deferred income taxes(a) | 817 |  | 138 |  | 439 |  | 202 |  | 180 |  | 82 |  | 156 |  | 136 |
ITC amortization | (11) |  | (4) |  | (6) |  | (6) |  | — |  | — |  | — |  | — |
Income tax expense from continuing operations | 519 |  | 311 |  | 253 |  | 157 |  | 155 |  | 40 |  | 134 |  | 43 |
Tax benefit from discontinued operations | (2) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total income tax expense included in Consolidated Statements of Operations | $ | 517 |  | $ | 311 |  | $ | 253 |  | $ | 157 |  | $ | 155 |  | $ | 40 |  | $ | 134 |  | $ | 43 |
(a) Total deferred income taxes includes the generation of tax credit carryforwards of $8 million at Duke Energy Carolinas. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $243 million at Progress Energy, $35 million at Duke Energy Progress, $152 million at Duke Energy Florida, $25 million at Duke Energy Ohio, $60 million at Duke Energy Indiana, $90 million at Piedmont and $775 million at Duke Energy.
| Year Ended December 31, 2018 |
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Current income taxes |  |  |  |  |  |  |  |
Federal | $ | (647) |  | $ | (8) |  | $ | (135) |  | $ | (71) |  | $ | (49) |  | $ | 20 |  | $ | 29 |  | $ | 67 |
State | (11) |  | 6 |  | (5) |  | (5) |  | (10) |  | (1) |  | 3 |  | 1 |
Foreign | 3 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total current income taxes | (655) |  | (2) |  | (140) |  | (76) |  | (59) |  | 19 |  | 32 |  | 68 |
Deferred income taxes |  |  |  |  |  |  |  |
Federal | 1,064 |  | 299 |  | 341 |  | 256 |  | 115 |  | 21 |  | 74 |  | (36) |
State | 49 |  | 11 |  | 20 |  | (17) |  | 45 |  | 3 |  | 22 |  | 5 |
Total deferred income taxes(a)(b) | 1,113 |  | 310 |  | 361 |  | 239 |  | 160 |  | 24 |  | 96 |  | (31) |
ITC amortization | (10) |  | (5) |  | (3) |  | (3) |  | — |  | — |  | — |  | — |
Income tax expense from continuing operations | 448 |  | 303 |  | 218 |  | 160 |  | 101 |  | 43 |  | 128 |  | 37 |
Tax benefit from discontinued operations | (26) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total income tax expense included in Consolidated Statements of Operations | $ | 422 |  | $ | 303 |  | $ | 218 |  | $ | 160 |  | $ | 101 |  | $ | 43 |  | $ | 128 |  | $ | 37 |
(a) Includes benefits of NOL carryforwards and tax credit carryforwards of $22 million at Duke Energy Carolinas, $293 million at Progress Energy, $59 million at Duke Energy Progress, $219 million at Duke Energy Florida, $17 million at Duke Energy Ohio, $21 million at Duke Energy Indiana and $39 million at Piedmont. In addition, total deferred income taxes includes utilization of NOL carryforwards and tax credit carryforwards of $18 million at Duke Energy. (b) For the year ended December 31, 2018, the Company has revised the December 31, 2017, estimates of the income tax effects of the Tax Act, in accordance with SAB 118. See the Statutory Rate Reconciliation section below for additional information on the Tax Act's impact on income tax expense .
Schedule of Income before Income Tax, Domestic and Foreign | Duke Energy Income from Continuing Operations before Income Taxes
| Years Ended December 31,
(in millions) | 2020 |  | 2019 |  | 2018
Domestic | $ | 826 |  |  | $ | 4,053 |  |  | $ | 3,018 |
Foreign | 13 |  |  | 44 |  |  | 55 |
Income from continuing operations before income taxes | $ | 839 |  |  | $ | 4,097 |  |  | $ | 3,073 |
Summary of Effective Tax Rates | The following tables present a reconciliation of income tax expense at the U.S. federal statutory tax rate to the actual tax expense from continuing operations.
| Year Ended December 31, 2020
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Income tax expense, computed at the statutory rate of 21% | $ | 176 |  | $ | 219 |  | $ | 243 |  | $ | 80 |  | $ | 204 |  | $ | 62 |  | $ | 103 |  | $ | 61 |
State income tax, net of federal income tax effect | (80) |  | (40) |  | 4 |  | (25) |  | 39 |  | 2 |  | 19 |  | (12) |
Amortization of excess deferred income tax | (276) |  | (82) |  | (118) |  | (68) |  | (49) |  | (20) |  | (36) |  | (21) |
AFUDC equity income | (48) |  | (13) |  | (9) |  | (6) |  | (3) |  | (2) |  | (4) |  | (10) |
AFUDC equity depreciation | 103 |  | 19 |  | 10 |  | 5 |  | 5 |  | 1 |  | 4 |  | — |
Noncontrolling Interests | 62 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Renewable energy PTCs | (110) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Other tax credits | (37) |  | (13) |  | (16) |  | (14) |  | (2) |  | (1) |  | (3) |  | (2) |
Tax true up | (12) |  | (3) |  | 1 |  | (5) |  | 5 |  | — |  | (1) |  | 1 |
Other items, net | (14) |  | 1 |  | (2) |  | (3) |  | (1) |  | 1 |  | 2 |  | 1 |
Income tax (benefit) expense from continuing operations | $ | (236) |  | $ | 88 |  | $ | 113 |  | $ | (36) |  | $ | 198 |  | $ | 43 |  | $ | 84 |  | $ | 18 |
Effective tax rate | (28.1) | % | 8.4 | % | 9.7 | % | (9.5) | % | 20.4 | % | 14.6 | % | 17.1 | % | 6.2 | %
| Year Ended December 31, 2019 |
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Income tax expense, computed at the statutory rate of 21% | $ | 860 |  | $ | 360 |  | $ | 332 |  | $ | 202 |  | $ | 178 |  | $ | 59 |  | $ | 120 |  | $ | 51 |
State income tax, net of federal income tax effect | (22) |  | (19) |  | 8 |  | (17) |  | 35 |  | 3 |  | 22 |  | 2 |
Amortization of excess deferred income tax | (121) |  | (29) |  | (64) |  | (10) |  | (54) |  | (12) |  | (6) |  | (10) |
AFUDC equity income | (52) |  | (9) |  | (14) |  | (13) |  | (1) |  | (3) |  | (3) |  | — |
AFUDC equity depreciation | 34 |  | 19 |  | 10 |  | 5 |  | 5 |  | 1 |  | 4 |  | — |
Renewable energy PTCs | (120) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Other tax credits | (23) |  | (11) |  | (9) |  | (7) |  | (2) |  | (1) |  | (1) |  | (1) |
Tax true up | (64) |  | (9) |  | (8) |  | (3) |  | (5) |  | (7) |  | (1) |  | — |
Other items, net | 27 |  | 9 |  | (2) |  | — |  | (1) |  | — |  | (1) |  | 1 |
Income tax expense from continuing operations | $ | 519 |  | $ | 311 |  | $ | 253 |  | $ | 157 |  | $ | 155 |  | $ | 40 |  | $ | 134 |  | $ | 43 |
Effective tax rate | 12.7 | % | 18.1 | % | 16.0 | % | 16.3 | % | 18.3 | % | 14.3 | % | 23.5 | % | 17.6 | %
| Year Ended December 31, 2018 |
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Income tax expense, computed at the statutory rate of 21% | $ | 645 |  | $ | 288 |  | $ | 263 |  | $ | 174 |  | $ | 137 |  | $ | 46 |  | $ | 109 |  | $ | 35 |
State income tax, net of federal income tax effect | 30 |  | 14 |  | 13 |  | (17) |  | 28 |  | 2 |  | 20 |  | 4 |
Amortization of excess deferred income tax | (61) |  | — |  | (55) |  | (1) |  | (54) |  | (3) |  | (2) |  | — |
AFUDC equity income | (42) |  | (15) |  | (22) |  | (12) |  | (10) |  | (2) |  | (2) |  | — |
AFUDC equity depreciation | 31 |  | 18 |  | 9 |  | 5 |  | 4 |  | 1 |  | 4 |  | — |
Renewable energy PTCs | (129) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Other tax credits | (28) |  | (7) |  | (13) |  | (5) |  | (8) |  | (1) |  | (1) |  | (3) |
Tax Act(a) | 20 |  | 1 |  | 25 |  | 19 |  | — |  | 2 |  | — |  | — |
Other items, net | (18) |  | 4 |  | (2) |  | (3) |  | 4 |  | (2) |  | — |  | 1 |
Income tax expense from continuing operations | $ | 448 |  | $ | 303 |  | $ | 218 |  | $ | 160 |  | $ | 101 |  | $ | 43 |  | $ | 128 |  | $ | 37 |
Effective tax rate | 14.6 | % | 22.1 | % | 17.4 | % | 19.3 | % | 15.4 | % | 19.6 | % | 24.6 | % | 22.3 | %
(a) For the year ended December 31, 2018, the Company revised the December 31, 2017, estimates of the income tax effects of the Tax Act, in accordance with SAB 118. Amounts primarily include but are not limited to items that are excluded for ratemaking purposes related certain wholesale fixed-rate contracts, remeasurement of nonregulated net deferred tax liabilities, Federal NOLs, and valuation allowance on foreign tax credits.
Schedule of Deferred Tax Assets and Liabilities | Net Deferred Income Tax Liability Components
| December 31, 2020
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Deferred credits and other liabilities | $ | 286 |  | $ | 85 |  | $ | 87 |  | $ | 67 |  | $ | 18 |  | $ | 21 |  | $ | 7 |  | $ | 38 |
Lease obligations | 515 |  | 96 |  | 208 |  | 120 |  | 87 |  | 5 |  | 16 |  | 5 |
Pension, post-retirement and other employee benefits | 236 |  | (30) |  | 68 |  | 24 |  | 38 |  | 16 |  | 26 |  | (5) |
Progress Energy merger purchase accounting adjustments(a) | 441 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Tax credits and NOL carryforwards | 3,909 |  | 285 |  | 508 |  | 179 |  | 282 |  | 16 |  | 183 |  | 29 |
Regulatory liabilities and deferred credits | — |  | 11 |  | — |  | — |  | — |  | 18 |  | — |  | — |
Investments and other assets | — |  | — |  | — |  | — |  | — |  | 7 |  |  | — |
Other | 93 |  | 8 |  | 14 |  | 9 |  | 4 |  | 7 |  | 1 |  | 8 |
Valuation allowance | (586) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total deferred income tax assets | 4,894 |  | 455 |  | 885 |  | 399 |  | 429 |  | 90 |  | 233 |  | 75 |
Investments and other assets | (2,267) |  | (1,127) |  | (669) |  | (507) |  | (164) |  | — |  | (14) |  | (48) |
Accelerated depreciation rates | (10,729) |  | (3,170) |  | (3,868) |  | (1,778) |  | (2,124) |  | (1,071) |  | (1,433) |  | (844) |
Regulatory assets and deferred debits, net | (1,142) |  | — |  | (744) |  | (412) |  | (332) |  | — |  | (14) |  | (4) |
Total deferred income tax liabilities | (14,138) |  | (4,297) |  | (5,281) |  | (2,697) |  | (2,620) |  | (1,071) |  | (1,461) |  | (896) |
Net deferred income tax liabilities | $ | (9,244) |  | $ | (3,842) |  | $ | (4,396) |  | $ | (2,298) |  | $ | (2,191) |  | $ | (981) |  | $ | (1,228) |  | $ | (821) |
(a) Primarily related to lease obligations and debt fair value adjustments.
| December 31, 2019
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Deferred credits and other liabilities | $ | 125 |  | $ | 24 |  | $ | 25 |  | $ | 49 |  | $ | — |  | $ | 14 |  | $ | 5 |  | $ | 22 |
Lease obligations | 462 |  | 72 |  | 193 |  | 92 |  | 102 |  | 5 |  | 17 |  | 6 |
Pension, post-retirement and other employee benefits | 303 |  | (5) |  | 88 |  | 38 |  | 44 |  | 17 |  | 27 |  | (3) |
Progress Energy merger purchase accounting adjustments(a) | 389 |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Tax credits and NOL carryforwards | 3,925 |  | 262 |  | 486 |  | 176 |  | 253 |  | 16 |  | 176 |  | 19 |
Regulatory liabilities and deferred credits | — |  | — |  | — |  | — |  | — |  | 36 |  | 52 |  | 42 |
Investments and other assets | — |  | — |  | — |  | — |  | — |  | 10 |  | — |  | 2 |
Other | 97 |  | 5 |  | 8 |  | 3 |  | 2 |  | 8 |  | 1 |  | 6 |
Valuation allowance | (587) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total deferred income tax assets | 4,714 |  | 358 |  | 800 |  | 358 |  | 401 |  | 106 |  | 278 |  | 94 |
Investments and other assets | (1,664) |  | (981) |  | (577) |  | (390) |  | (190) |  | — |  | (12) |  | — |
Accelerated depreciation rates | (10,813) |  | (3,254) |  | (3,798) |  | (1,918) |  | (1,913) |  | (1,028) |  | (1,416) |  | (802) |
Regulatory assets and deferred debits, net | (1,115) |  | (44) |  | (887) |  | (438) |  | (477) |  | — |  | — |  | — |
Total deferred income tax liabilities | (13,592) |  | (4,279) |  | (5,262) |  | (2,746) |  | (2,580) |  | (1,028) |  | (1,428) |  | (802) |
Net deferred income tax liabilities | $ | (8,878) |  | $ | (3,921) |  | $ | (4,462) |  | $ | (2,388) |  | $ | (2,179) |  | $ | (922) |  | $ | (1,150) |  | $ | (708) |
(a) Primarily related to finance lease obligations and debt fair value adjustments.
Summary of Tax Credit Carryforwards | The following table presents the expiration of tax credits and NOL carryforwards.
| December 31, 2020
(in millions) | Amount |  | Expiration Year
General Business Credits | $ | 2,033 |  |  | 2024 |  | — |  | 2040
Federal NOL carryforwards(a) (f) | 154 |  |  | 2024 |  | — |  | Indefinite
Capital loss carryforward(e) | 85 |  |  | 2024
State carryforwards and credits(b) (f) | 340 |  |  | 2021 |  | — |  | Indefinite
Foreign NOL carryforwards(c) | 12 |  |  | 2027 |  | — |  | 2037
Foreign Tax Credits(d) | 1,272 |  |  | 2024 |  | — |  | 2027
Charitable contribution carryforwards | 13 |  |  | 2025
Total tax credits and NOL carryforwards | $ | 3,909 |  |  |  |  |  |  |
(a) A valuation allowance of $4 million has been recorded on the Federal NOL carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (b) A valuation allowance of $97 million has been recorded on the state NOL and attribute carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (c) A valuation allowance of $12 million has been recorded on the foreign NOL carryforwards, as presented in the Net Deferred Income Tax Liability Components table. (d) A valuation allowance of $388 million has been recorded on the foreign tax credits, as presented in the Net Deferred Income Tax Liability Components table. (e) A valuation allowance of $85 million has been recorded on the Federal capital loss carryforward, as presented in the Net Deferred Income Tax Liability Components table. (f) Indefinite carryforward for Federal NOLs, and NOLs for states that have adopted the Tax Act's NOL provisions, generated in tax years beginning after December 31, 2017.
Schedule of Unrecognized Tax Benefits Roll Forward | The following tables present changes to unrecognized tax benefits.
| Year Ended December 31, 2020
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Unrecognized tax benefits – January 1 | $ | 126 |  | $ | 8 |  | $ | 9 |  | $ | 6 |  | $ | 3 |  | $ | 1 |  | $ | 1 |  | $ | 4 |
Gross decreases – tax positions in prior periods | (2) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Gross increases – current period tax positions | 4 |  | 2 |  | 1 |  | — |  | — |  | — |  | — |  | — |
Reduction due to lapse of statute of limitations | (3) |  | — |  | — |  | — |  | — |  | — |  | — |  | (3) |
Total changes | (1) |  | 2 |  | 1 |  | — |  | — |  | — |  | — |  | (3) |
Unrecognized tax benefits – December 31 | $ | 125 |  | $ | 10 |  | $ | 10 |  | $ | 6 |  | $ | 3 |  | $ | 1 |  | $ | 1 |  | $ | 1 |
| Year Ended December 31, 2019 |
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Unrecognized tax benefits – January 1 | $ | 24 |  | $ | 6 |  | $ | 9 |  | $ | 6 |  | $ | 3 |  | $ | 1 |  | $ | 1 |  | $ | 4 |
Unrecognized tax benefits increases | 105 |  | 2 |  | 1 |  | 1 |  | — |  | — |  | — |  | — |
Gross decreases – tax positions in prior periods | (3) |  | — |  | (1) |  | (1) |  | — |  | — |  | — |  | — |
Total changes | 102 |  | 2 |  | — |  | — |  | — |  | — |  | — |  | — |
Unrecognized tax benefits – December 31 | $ | 126 |  | $ | 8 |  | $ | 9 |  | $ | 6 |  | $ | 3 |  | $ | 1 |  | $ | 1 |  | $ | 4 |
| Year Ended December 31, 2018 |
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Unrecognized tax benefits – January 1 | $ | 25 |  | $ | 5 |  | $ | 5 |  | $ | 5 |  | $ | 5 |  | $ | 1 |  | $ | 1 |  | $ | 3 |
Unrecognized tax benefits increases (decreases) |  |  |  |  |  |  |  |
Gross decreases – tax positions in prior periods | (2) |  | (1) |  | — |  | — |  | (4) |  | — |  | — |  | — |
Gross increases – tax positions in prior periods | 7 |  | 2 |  | 4 |  | 1 |  | 2 |  | — |  | — |  | 1 |
Decreases due to settlements | (6) |  | — |  | — |  | — |  | — |  | — |  | — |  | — |
Total changes | (1) |  | 1 |  | 4 |  | 1 |  | (2) |  | — |  | — |  | 1 |
Unrecognized tax benefits – December 31 | $ | 24 |  | $ | 6 |  | $ | 9 |  | $ | 6 |  | $ | 3 |  | $ | 1 |  | $ | 1 |  | $ | 4 |
Summary of Income Tax Contingencies | The following table includes additional information regarding the Duke Energy Registrants' unrecognized tax benefits at December 31, 2020. Duke Energy Registrants do not anticipate a material increase or decrease in unrecognized tax benefits within the next 12 months.
| December 31, 2020
|  | Duke |  | Duke | Duke | Duke | Duke |
| Duke | Energy | Progress | Energy | Energy | Energy | Energy |
(in millions) | Energy | Carolinas | Energy | Progress | Florida | Ohio | Indiana | Piedmont
Amount that if recognized, would affect the effective tax rate or regulatory liability(a) | $ | 122 |  | $ | 10 |  | $ | 10 |  | $ | 6 |  | $ | 3 |  | $ | 1 |  | $ | 1 |  | $ | 1 |
(a) The Duke Energy Registrants are unable to estimate the specific amounts that would affect the ETR versus the regulatory liability.

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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