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Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | $ 485 | $ 832
Regulatory assets | 17,266 | 18,130
Regulatory liabilities | 15,408 | 15,048
Duke Energy Carolinas |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 57 | 38
Regulatory assets | 5,480 | 5,388
Regulatory liabilities | 6,577 | 6,313
Progress Energy |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 266 | 292
Regulatory assets | 8,091 | 8,979
Regulatory liabilities | 5,501 | 5,329
Duke Energy Progress |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 146 | 160
Regulatory assets | 5,488 | 5,414
Regulatory liabilities | 4,675 | 4,452
Duke Energy Florida |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 98 | 111
Regulatory assets | 2,603 | 3,565
Regulatory liabilities | 826 | 877
Duke Energy Ohio |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 97 | 90
Regulatory assets | 749 | 684
Regulatory liabilities | 553 | 633
Duke Energy Indiana |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 115 | 122
Regulatory assets | 996 | 1,124
Regulatory liabilities | 1,668 | 1,641
Piedmont |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 8 | 7
Regulatory assets | 571 | 511
Regulatory liabilities | 1,086 | 1,098
Pension Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 863 | 885
Noncurrent pension liability |  | 250
Net asset (liability) recognized | (863) | (635)
Regulatory assets | 2,021 | 2,016
Accumulated other comprehensive (income) loss |  |
Deferred income tax benefit | (27) | (27)
Prior service credit | (1) | (1)
Net actuarial gain | 127 | 129
Net amounts recognized in accumulated other comprehensive income | 99 | 101
Pension Plan | Duke Energy Carolinas |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 339 | 261
Net asset (liability) recognized | (339) | (261)
Regulatory assets | 531 | 545
Pension Plan | Progress Energy |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 463 | 396
Net asset (liability) recognized | (463) | (396)
Regulatory assets | 678 | 670
Accumulated other comprehensive (income) loss |  |
Deferred income tax benefit | (1) | (1)
Net actuarial gain | 3 | 3
Net amounts recognized in accumulated other comprehensive income | 2 | 2
Pension Plan | Duke Energy Progress |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 209 | 174
Net asset (liability) recognized | (209) | (174)
Regulatory assets | 353 | 353
Pension Plan | Duke Energy Florida |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 247 | 216
Net asset (liability) recognized | (247) | (216)
Regulatory assets | 325 | 316
Pension Plan | Duke Energy Ohio |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 74 | 62
Noncurrent pension liability | 73 | 72
Net asset (liability) recognized | (1) | 10
Regulatory assets | 89 | 92
Pension Plan | Duke Energy Indiana |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 105 | 90
Noncurrent pension liability | 87 | 88
Net asset (liability) recognized | (18) | (2)
Regulatory assets | 176 | 178
Accumulated other comprehensive (income) loss |  |
Net actuarial gain | 2 |
Net amounts recognized in accumulated other comprehensive income | 2 |
Pension Plan | Piedmont |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 38 | 33
Net asset (liability) recognized | (38) | (33)
Regulatory assets | 97 | 84
Other Post-Retirement Benefit Plans |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Current pension liability | 12 | 9
Noncurrent pension liability | 179 | 266
Net asset (liability) recognized | 191 | 275
Regulatory assets | 123 | 50
Regulatory liabilities | 230 | 189
Accumulated other comprehensive (income) loss |  |
Deferred income tax expense | 3 | 3
Prior service credit |  | (1)
Net actuarial gain | (13) | (13)
Net amounts recognized in accumulated other comprehensive income | (10) | (11)
Other Post-Retirement Benefit Plans | Duke Energy Carolinas |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 61 |
Current pension liability | 3 |
Noncurrent pension liability | 25 | 7
Net asset (liability) recognized | (33) | 7
Regulatory assets | 79 |
Regulatory liabilities | 106 | 44
Other Post-Retirement Benefit Plans | Progress Energy |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Current pension liability | 5 | 5
Noncurrent pension liability | 142 | 163
Net asset (liability) recognized | 147 | 168
Regulatory assets | 39 | 46
Accumulated other comprehensive (income) loss |  |
Net actuarial gain | (1) |
Net amounts recognized in accumulated other comprehensive income | (1) |
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Current pension liability | 3 | 3
Noncurrent pension liability | 82 | 94
Net asset (liability) recognized | 85 | 97
Regulatory assets | 29 | 34
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Current pension liability | 2 | 2
Noncurrent pension liability | 59 | 69
Net asset (liability) recognized | 61 | 71
Regulatory assets | 11 | 11
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 1 | 1
Current pension liability | 1 | 2
Noncurrent pension liability | 12 | 12
Net asset (liability) recognized | 12 | 13
Regulatory assets | 2 | 4
Regulatory liabilities | 17 | 21
Other Post-Retirement Benefit Plans | Duke Energy Indiana |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 21 | 27
Net asset (liability) recognized | 21 | 27
Regulatory assets | 23 | 25
Regulatory liabilities | 74 | 82
Other Post-Retirement Benefit Plans | Piedmont |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 12 | 10
Net asset (liability) recognized | (12) | $ (10)
Regulatory assets | $ 1 |

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