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Asset Retirement Obligations (ARO by Category) (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Asset Retirement Obligations [Line Items] |  |
Total ARO | $ 13,654 | $ 13,318
Less: Current portion | 742 | 881
Total noncurrent ARO | 12,912 | 12,437
Duke Energy Carolinas |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,774 | 5,734
Less: Current portion | 267 | 206
Total noncurrent ARO | 5,507 | 5,528
Progress Energy |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 6,355 | 6,471
Less: Current portion | 297 | 485
Total noncurrent ARO | 6,058 | 5,986
Duke Energy Progress |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,800 | 5,893
Less: Current portion | 297 | 485
Total noncurrent ARO | 5,503 | 5,408
Duke Energy Florida |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 555 | 578
Total noncurrent ARO | 555 | 578
Duke Energy Ohio |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 91 | 80
Less: Current portion | 7 | 1
Total noncurrent ARO | 84 | 79
Duke Energy Indiana |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 1,214 | 832
Less: Current portion | 170 | 189
Total noncurrent ARO | 1,044 | 643
Piedmont Natural Gas |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 17 | 17
Total noncurrent ARO | 17 | $ 17
Decommissioning of nuclear power facilities |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 6,815 |
Decommissioning of nuclear power facilities | Duke Energy Carolinas |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,658 |
Decommissioning of nuclear power facilities | Progress Energy |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 4,107 |
Decommissioning of nuclear power facilities | Duke Energy Progress |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,606 |
Decommissioning of nuclear power facilities | Duke Energy Florida |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 501 |
Closure of ash impoundments |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 6,458 |
Closure of ash impoundments | Duke Energy Carolinas |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,049 |
Closure of ash impoundments | Progress Energy |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,172 |
Closure of ash impoundments | Duke Energy Progress |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,150 |
Closure of ash impoundments | Duke Energy Florida |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 22 |
Closure of ash impoundments | Duke Energy Ohio |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 51 |
Closure of ash impoundments | Duke Energy Indiana |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 1,186 |
Other |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 381 |
Other | Duke Energy Carolinas |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 67 |
Other | Progress Energy |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 76 |
Other | Duke Energy Progress |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 44 |
Other | Duke Energy Florida |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 32 |
Other | Duke Energy Ohio |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 40 |
Other | Duke Energy Indiana |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 28 |
Other | Piedmont Natural Gas |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | $ 17 |

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- Definition The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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