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Asset Retirement Obligations (ARO by Category) (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Asset Retirement Obligations [Line Items] |  |
Total ARO | $ 12,628 | $ 10,467
Less: current portion | 739 | 919
Total noncurrent ARO | 11,889 | 9,548
Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,342 | 3,949
Less: current portion | 203 | 290
Total noncurrent ARO | 5,139 | 3,659
Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 6,193 | 5,411
Less: current portion | 416 | 514
Total noncurrent ARO | 5,777 | 4,897
Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,616 | 4,820
Less: current portion | 413 | 509
Total noncurrent ARO | 5,203 | 4,311
Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 577 | 591
Less: current portion | 3 | 5
Total noncurrent ARO | 574 | 586
Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 89 | 93
Less: current portion | 6 | 6
Total noncurrent ARO | 83 | 87
Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 719 | 722
Less: current portion | 115 | 109
Total noncurrent ARO | 604 | 613
Piedmont Natural Gas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 19 | 19
Total noncurrent ARO | 19 | $ 19
Decommissioning of Nuclear Power Facilities [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,807 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,401 |
Decommissioning of Nuclear Power Facilities [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,265 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,739 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 526 |
Closure of Ash Impoundments [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 6,498 |
Closure of Ash Impoundments [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,894 |
Closure of Ash Impoundments [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,858 |
Closure of Ash Impoundments [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,839 |
Closure of Ash Impoundments [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 19 |
Closure of Ash Impoundments [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 47 |
Closure of Ash Impoundments [Member] | Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 699 |
Other [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 323 |
Other [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 47 |
Other [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 70 |
Other [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 38 |
Other [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 32 |
Other [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 42 |
Other [Member] | Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 20 |
Other [Member] | Piedmont Natural Gas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | $ 19 |

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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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