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Asset Retirement Obligations (Recorded on the Balance Sheet) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | $ 13,004 | $ 13,318 | $ 10,467
Less: Current portion | 718 | 881 |
Total noncurrent asset retirement obligation | 12,286 | 12,437 |
Decommissioning of nuclear power facilities |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 6,845 |  |
Closure of ash impoundments |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 5,778 |  |
Other |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 381 |  |
Duke Energy Carolinas |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 5,350 | 5,734 | 3,949
Less: Current portion | 264 | 206 |
Total noncurrent asset retirement obligation | 5,086 | 5,528 |
Duke Energy Carolinas | Decommissioning of nuclear power facilities |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 2,695 |  |
Duke Energy Carolinas | Closure of ash impoundments |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 2,597 |  |
Duke Energy Carolinas | Other |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 58 |  |
Progress Energy |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 6,149 | 6,471 | 5,411
Less: Current portion | 283 | 485 |
Total noncurrent asset retirement obligation | 5,866 | 5,986 |
Progress Energy | Decommissioning of nuclear power facilities |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 4,101 |  |
Progress Energy | Closure of ash impoundments |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 1,973 |  |
Progress Energy | Other |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 75 |  |
Duke Energy Progress |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 5,635 | 5,893 | 4,820
Less: Current portion | 283 | 485 |
Total noncurrent asset retirement obligation | 5,352 | 5,408 |
Duke Energy Progress | Decommissioning of nuclear power facilities |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 3,642 |  |
Duke Energy Progress | Closure of ash impoundments |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 1,950 |  |
Duke Energy Progress | Other |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 43 |  |
Duke Energy Florida |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 514 | 578 | 591
Total noncurrent asset retirement obligation | 514 | 578 |
Duke Energy Florida | Decommissioning of nuclear power facilities |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 459 |  |
Duke Energy Florida | Closure of ash impoundments |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 23 |  |
Duke Energy Florida | Other |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 32 |  |
Duke Energy Ohio |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 111 | 80 | 93
Less: Current portion | 3 | 1 |
Total noncurrent asset retirement obligation | 108 | 79 |
Duke Energy Ohio | Closure of ash impoundments |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 67 |  |
Duke Energy Ohio | Other |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 44 |  |
Duke Energy Indiana |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 1,176 | 832 | 722
Less: Current portion | 168 | 189 |
Total noncurrent asset retirement obligation | 1,008 | 643 |
Duke Energy Indiana | Closure of ash impoundments |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 1,140 |  |
Duke Energy Indiana | Other |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 36 |  |
Piedmont |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | 20 | 17 | $ 19
Total noncurrent asset retirement obligation | 20 | $ 17 |
Piedmont | Other |  |  |
Asset Retirement Obligation [Line Items] |  |  |
Total asset retirement obligation | $ 20 |  |

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