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Asset Retirement Obligations (ARO Rollforward) (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2018 USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | $ 10,175
Accretion expense | 319
Liabilities settled | (431)
Liabilities incurred in the current year | 34
Revision in estimates of cash flows | 159
Balance at end of period | 10,256
Duke Energy Carolinas [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 3,610
Accretion expense | 133
Liabilities settled | (198)
Liabilities incurred in the current year | 8
Revision in estimates of cash flows | 159
Balance at end of period | 3,712
Progress Energy [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 5,414
Accretion expense | 168
Liabilities settled | (186)
Revision in estimates of cash flows | 39
Balance at end of period | 5,435
Duke Energy Progress [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 4,673
Accretion expense | 145
Liabilities settled | (155)
Revision in estimates of cash flows | 178
Balance at end of period | 4,841
Duke Energy Florida [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 742
Accretion expense | 23
Liabilities settled | (31)
Revision in estimates of cash flows | (141)
Balance at end of period | 593
Duke Energy Ohio [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 84
Accretion expense | 3
Liabilities settled | (5)
Revision in estimates of cash flows | 16
Balance at end of period | 98
Duke Energy Indiana [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 781
Accretion expense | 22
Liabilities settled | (42)
Liabilities incurred in the current year | 25
Revision in estimates of cash flows | (42)
Balance at end of period | 744
Piedmont Natural Gas [Member] |
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward] |
Balance at beginning of period | 15
Balance at end of period | $ 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 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 incurred during the period. + 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)(1) -URI http://asc.fasb.org/extlink&oid=6392692&loc=d3e7535-110849 + 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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