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Asset Retirement Obligations (ARO Rollforward) (Details) $ in Millions | 6 Months Ended
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Jun. 30, 2019 USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | $ 10,467
Accretion expense | 245
Liabilities settled | (404)
Revision in estimates of cash flows | 2,320
Balance at end of period | 12,628
Duke Energy Carolinas [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 3,949
Accretion expense | 111
Liabilities settled | (155)
Revision in estimates of cash flows | 1,437
Balance at end of period | 5,342
Progress Energy [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 5,411
Accretion expense | 124
Liabilities settled | (225)
Revision in estimates of cash flows | 883
Balance at end of period | 6,193
Duke Energy Progress [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 4,820
Accretion expense | 111
Liabilities settled | (197)
Revision in estimates of cash flows | 882
Balance at end of period | 5,616
Duke Energy Florida [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 591
Accretion expense | 13
Liabilities settled | (28)
Revision in estimates of cash flows | 1
Balance at end of period | 577
Duke Energy Ohio [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 93
Accretion expense | 2
Liabilities settled | (6)
Balance at end of period | 89
Duke Energy Indiana [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 722
Accretion expense | 14
Liabilities settled | (17)
Balance at end of period | 719
Piedmont Natural Gas [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 19
Balance at end of period | $ 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 Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability. + 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)(3) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6392676&loc=d3e7480-110848 + Details
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- Definition Amount of asset retirement obligations settled, or otherwise disposed of, during the period. This may include asset retirement obligations transferred to third parties associated with the sale of a long-lived asset. + 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)(2) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition Amount of increase (decrease) in the asset retirement obligation from changes in the amount or timing of the estimated cash flows associated with the settlement of the obligation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 35 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6392603&loc=d3e7123-110846 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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