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Asset Retirement Obligations (ARO by Category) (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Asset Retirement Obligations [Line Items] |  |
Total ARO | $ 13,035 | $ 10,467
Less: current portion | 779 | 919
Total noncurrent ARO | 12,256 | 9,548
Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,428 | 3,949
Less: current portion | 209 | 290
Total noncurrent ARO | 5,219 | 3,659
Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 6,506 | 5,411
Less: current portion | 456 | 514
Total noncurrent ARO | 6,050 | 4,897
Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 5,923 | 4,820
Less: current portion | 452 | 509
Total noncurrent ARO | 5,471 | 4,311
Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 583 | 591
Less: current portion | 4 | 5
Total noncurrent ARO | 579 | 586
Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 93 | 93
Less: current portion | 6 | 6
Total noncurrent ARO | 87 | 87
Duke Energy Indiana [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 719 | 722
Less: current portion | 108 | 109
Total noncurrent ARO | 611 | 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 | 5,753 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,368 |
Decommissioning of Nuclear Power Facilities [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,239 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 2,709 |
Decommissioning of Nuclear Power Facilities [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 530 |
Closure of Ash Impoundments [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 6,961 |
Closure of Ash Impoundments [Member] | Duke Energy Carolinas [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,013 |
Closure of Ash Impoundments [Member] | Progress Energy [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,197 |
Closure of Ash Impoundments [Member] | Duke Energy Progress [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 3,177 |
Closure of Ash Impoundments [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 20 |
Closure of Ash Impoundments [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 52 |
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 | 321 |
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 | 37 |
Other [Member] | Duke Energy Florida [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 33 |
Other [Member] | Duke Energy Ohio [Member] |  |
Asset Retirement Obligations [Line Items] |  |
Total ARO | 41 |
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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- 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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