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Asset Retirement Obligations (ARO by Category) (Details) - USD ($) $ in Millions | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Asset Retirement Obligations [Line Items] |  |
Total ARO | $ 10,469 | $ 10,175
Less: current portion | 716 | 689
Total noncurrent ARO | 9,753 | 9,486
Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,819 | 3,610
Less: current portion | 227 | 337
Total noncurrent ARO | 3,592 | 3,273
Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,438 | 5,414
Less: current portion | 386 | 295
Total noncurrent ARO | 5,052 | 5,119
Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 4,835 | 4,673
Less: current portion | 381 | 295
Total noncurrent ARO | 4,454 | 4,378
Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 602 | 742
Less: current portion | 5 | 0
Total noncurrent ARO | 597 | 742
Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 89 | 84
Less: current portion | 5 | 3
Total noncurrent ARO | 84 | 81
Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 856 | 781
Less: current portion | 98 | 54
Total noncurrent ARO | 758 | 727
Piedmont Natural Gas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 15 | 15
Total noncurrent ARO | 15 | $ 15
Decommissioning of Nuclear Power Facilities [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,319 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,002 |
Decommissioning of Nuclear Power Facilities [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,158 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,621 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 536 |
Closure of Ash Impoundments [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 4,843 |
Closure of Ash Impoundments [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 1,761 |
Closure of Ash Impoundments [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,202 |
Closure of Ash Impoundments [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,178 |
Closure of Ash Impoundments [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 24 |
Closure of Ash Impoundments [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 44 |
Closure of Ash Impoundments [Member] | Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 836 |
Other [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 307 |
Other [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 56 |
Other [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 78 |
Other [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 36 |
Other [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 42 |
Other [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 45 |
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 | $ 15 |

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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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- Definition Current portion of 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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- Definition Noncurrent portion of 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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