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Employee Benefit Plans (Amounts Recognized in Consolidated Balance Sheets) (Details) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | $ 832 | $ 855
Regulatory assets | 18,130 | 14,637
Regulatory liabilities | 15,048 | 17,363
Duke Energy Carolinas |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 38 | 50
Regulatory assets | 5,388 | 3,479
Regulatory liabilities | 6,313 | 7,685
Progress Energy |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 292 | 417
Regulatory assets | 8,979 | 6,939
Regulatory liabilities | 5,329 | 6,044
Duke Energy Progress |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 160 | 221
Regulatory assets | 5,414 | 4,651
Regulatory liabilities | 4,452 | 5,249
Duke Energy Florida |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 111 | 166
Regulatory assets | 3,565 | 2,288
Regulatory liabilities | 877 | 796
Duke Energy Ohio |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 90 | 109
Regulatory assets | 684 | 707
Regulatory liabilities | 633 | 801
Duke Energy Indiana |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 122 | 167
Regulatory assets | 1,124 | 1,555
Regulatory liabilities | 1,641 | 1,692
Piedmont |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 7 | 7
Regulatory assets | 511 | 457
Regulatory liabilities | 1,098 | 1,114
Pension Plan | Qualified Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 885 | 1,071
Noncurrent pension liability | 250 | 43
Net amount recognized | (635) | (1,028)
Regulatory assets | 2,016 | 1,649
Accumulated other comprehensive (income) loss |  |
Deferred income tax asset | (27) | (20)
Prior service credit | (1) | (1)
Net actuarial loss (gain) | 129 | 92
Net amount recognized in accumulated other comprehensive income (loss) | 101 | 71
Pension Plan | Duke Energy Carolinas | Qualified Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 261 | 462
Net amount recognized | (261) | (462)
Regulatory assets | 545 | 324
Pension Plan | Progress Energy | Qualified Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 396 | 494
Noncurrent pension liability |  | 1
Net amount recognized | (396) | (493)
Regulatory assets | 670 | 563
Accumulated other comprehensive (income) loss |  |
Deferred income tax asset | (1) |
Net actuarial loss (gain) | 3 | 1
Net amount recognized in accumulated other comprehensive income (loss) | 2 | 1
Pension Plan | Duke Energy Progress | Qualified Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 174 | 268
Net amount recognized | (174) | (268)
Regulatory assets | 353 | 252
Pension Plan | Duke Energy Florida | Qualified Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 216 | 219
Noncurrent pension liability |  | 1
Net amount recognized | (216) | (218)
Regulatory assets | 316 | 311
Pension Plan | Duke Energy Ohio | Qualified Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 62 | 74
Noncurrent pension liability | 72 | 86
Net amount recognized | 10 | 12
Regulatory assets | 92 | 93
Pension Plan | Duke Energy Indiana | Qualified Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 90 | 100
Noncurrent pension liability | 88 | 111
Net amount recognized | (2) | 11
Regulatory assets | 178 | 190
Pension Plan | Piedmont | Qualified Plan |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 33 | 61
Net amount recognized | (33) | (61)
Regulatory assets | 84 | 75
Other Post-Retirement Benefit Plans |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension |  | 12
Current pension liability | 9 | 9
Noncurrent pension liability | 266 | 417
Net amount recognized | 275 | 414
Regulatory assets | 50 | 129
Regulatory liabilities | 189 | 162
Accumulated other comprehensive (income) loss |  |
Deferred income tax liability | 3 | 3
Prior service credit | (1) | (1)
Net actuarial loss (gain) | (13) | (14)
Net amount recognized in accumulated other comprehensive income (loss) | (11) | (12)
Other Post-Retirement Benefit Plans | Duke Energy Carolinas |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 7 | 14
Net amount recognized | 7 | 14
Regulatory liabilities | 44 | 44
Other Post-Retirement Benefit Plans | Progress Energy |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Current pension liability | 5 | 5
Noncurrent pension liability | 163 | 259
Net amount recognized | 168 | 264
Regulatory assets | 46 | 126
Other Post-Retirement Benefit Plans | Duke Energy Progress |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Current pension liability | 3 | 3
Noncurrent pension liability | 94 | 146
Net amount recognized | 97 | 149
Regulatory assets | 34 | 79
Other Post-Retirement Benefit Plans | Duke Energy Florida |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Current pension liability | 2 | 2
Noncurrent pension liability | 69 | 112
Net amount recognized | 71 | 114
Regulatory assets | 11 | 47
Other Post-Retirement Benefit Plans | Duke Energy Ohio |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 1 | 1
Current pension liability | 2 | 1
Noncurrent pension liability | 12 | 16
Net amount recognized | 13 | 16
Regulatory assets | 4 | 4
Regulatory liabilities | 21 | 21
Other Post-Retirement Benefit Plans | Duke Energy Indiana |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Noncurrent pension liability | 27 | 48
Net amount recognized | 27 | 48
Regulatory assets | 25 | 28
Regulatory liabilities | 82 | 63
Other Post-Retirement Benefit Plans | Piedmont |  |
Amounts Recognized in Consolidated Balance Sheets [Abstract] |  |
Prefunded pension | 10 | 12
Net amount recognized | $ (10) | (12)
Regulatory liabilities |  | $ 5

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