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Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Current income taxes |  |  |
Federal | $ (2) | $ (281) | $ (299)
State | 2 | (9) | 10
Foreign | 2 | 1 | 2
Total current income taxes | 2 | (289) | (287)
Deferred income taxes |  |  |
Federal | 199 | 155 | 855
State | (1) | (92) | (38)
Total deferred income taxes | 198 | 63 | 817
ITC amortization | (8) | (10) | (11)
Income tax expense from continuing operations | 192 | (236) | 519
Tax expense from discontinued operations |  | 2 | (2)
Total income tax expense included in Consolidated Statements of Operations | 192 | (234) | 517
Net operating loss carry forward | 150 | 79 | 775
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Domestic | 3,720 | 826 | 4,053
Foreign | 44 | 13 | 44
Income from continuing operations before income taxes | 3,764 | 839 | 4,097
Duke Energy Carolinas |  |  |
Current income taxes |  |  |
Federal | 241 | 314 | 164
State | 23 | 35 | 13
Total current income taxes | 264 | 349 | 177
Deferred income taxes |  |  |
Federal | (130) | (171) | 175
State | (79) | (86) | (37)
Total deferred income taxes | (209) | (257) | 138
ITC amortization | (4) | (4) | (4)
Income tax expense from continuing operations | 51 | 88 | 311
Total income tax expense included in Consolidated Statements of Operations | 51 | 88 | 311
Net operating loss carry forward | 32 | 20 | 8
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Income from continuing operations before income taxes | 1,387 | 1,044 | 1,714
Progress Energy |  |  |
Current income taxes |  |  |
Federal | (15) | 280 | (173)
State | (4) | 29 | (7)
Total current income taxes | (19) | 309 | (180)
Deferred income taxes |  |  |
Federal | 203 | (167) | 422
State | 47 | (24) | 17
Total deferred income taxes | 250 | (191) | 439
ITC amortization | (4) | (5) | (6)
Income tax expense from continuing operations | 227 | 113 | 253
Total income tax expense included in Consolidated Statements of Operations | 227 | 113 | 253
Net operating loss carry forward | 95 | 39 | 243
Duke Energy Progress |  |  |
Current income taxes |  |  |
Federal | 113 | 181 | (36)
State | 8 | 17 | (3)
Total current income taxes | 121 | 198 | (39)
Deferred income taxes |  |  |
Federal | (16) | (180) | 220
State | (26) | (49) | (18)
Total deferred income taxes | (42) | (229) | 202
ITC amortization | (4) | (5) | (6)
Income tax expense from continuing operations | 75 | (36) | 157
Total income tax expense included in Consolidated Statements of Operations | 75 | (36) | 157
Net operating loss carry forward | 14 | 3 | 35
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Income from continuing operations before income taxes | 1,066 | 379 | 962
Duke Energy Florida |  |  |
Current income taxes |  |  |
Federal | (75) | 148 | (43)
State | (17) | 24 | 18
Total current income taxes | (92) | 172 | (25)
Deferred income taxes |  |  |
Federal | 202 | 1 | 153
State | 77 | 25 | 27
Total deferred income taxes | 279 | 26 | 180
Income tax expense from continuing operations | 187 | 198 | 155
Total income tax expense included in Consolidated Statements of Operations | 187 | 198 | 155
Net operating loss carry forward | 64 | 30 | 152
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Income from continuing operations before income taxes | 925 | 969 | 847
Duke Energy Ohio |  |  |
Current income taxes |  |  |
Federal | (8) | 10 | (41)
State | (2) | 1 | (1)
Total current income taxes | (10) | 11 | (42)
Deferred income taxes |  |  |
Federal | 35 | 30 | 77
State | 5 | 2 | 5
Total deferred income taxes | 40 | 32 | 82
Income tax expense from continuing operations | 30 | 43 | 40
Total income tax expense included in Consolidated Statements of Operations | 30 | 43 | 40
Net operating loss carry forward | 2 |  | 25
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Income from continuing operations before income taxes | 234 | 295 | 279
Duke Energy Indiana |  |  |
Current income taxes |  |  |
Federal | 65 | 48 | (23)
State | 7 | 7 | 1
Total current income taxes | 72 | 55 | (22)
Deferred income taxes |  |  |
Federal | 19 | 12 | 128
State | 16 | 17 | 28
Total deferred income taxes | 35 | 29 | 156
Income tax expense from continuing operations | 107 | 84 | 134
Total income tax expense included in Consolidated Statements of Operations | 107 | 84 | 134
Net operating loss carry forward | 8 | 8 | 60
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Income from continuing operations before income taxes | 588 | 492 | 570
Piedmont |  |  |
Current income taxes |  |  |
Federal | 23 | (27) | (92)
State | 3 | (8) | (1)
Total current income taxes | 26 | (35) | (93)
Deferred income taxes |  |  |
Federal | 17 | 60 | 133
State | (13) | (7) | 3
Total deferred income taxes | 4 | 53 | 136
Income tax expense from continuing operations | 30 | 18 | 43
Total income tax expense included in Consolidated Statements of Operations | 30 | 18 | 43
Net operating loss carry forward | 3 | 11 | 90
Duke Energy Income from Continuing Operations Before Income Taxes [Abstract] |  |  |
Income from continuing operations before income taxes | $ 340 | $ 291 | $ 245

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