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Asset Retirement Obligations (Rollforward) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | $ 10,175 | $ 10,611
Accretion expense | 427 | 435
Liabilities settled | (638) | (619)
Liabilities incurred in the current year | 39 | 51
Revisions in estimates of cash flows | 464 | (303)
Ending Balance | 10,467 | 10,175
Duke Energy Carolinas [Member] |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 3,610 | 3,895
Accretion expense | 179 | 184
Liabilities settled | (281) | (282)
Liabilities incurred in the current year | 8 | 5
Revisions in estimates of cash flows | 433 | (192)
Ending Balance | 3,949 | 3,610
Progress Energy [Member] |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 5,414 | 5,475
Accretion expense | 225 | 228
Liabilities settled | (272) | (270)
Liabilities incurred in the current year | 5 |
Revisions in estimates of cash flows | 39 | (19)
Ending Balance | 5,411 | 5,414
Duke Energy Progress [Member] |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 4,673 | 4,697
Accretion expense | 196 | 195
Liabilities settled | (227) | (204)
Revisions in estimates of cash flows | 178 | (15)
Ending Balance | 4,820 | 4,673
Duke Energy Florida [Member] |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 742 | 778
Accretion expense | 29 | 33
Liabilities settled | (45) | (65)
Liabilities incurred in the current year | 5 |
Revisions in estimates of cash flows | (140) | (4)
Ending Balance | 591 | 742
Duke Energy Ohio [Member] |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 84 | 77
Accretion expense | 4 | 3
Liabilities settled | (5) | (7)
Liabilities incurred in the current year |  | 7
Revisions in estimates of cash flows | 10 | 4
Ending Balance | 93 | 84
Duke Energy Indiana [Member] |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 781 | 866
Accretion expense | 29 | 32
Liabilities settled | (79) | (49)
Liabilities incurred in the current year | 25 | 29
Revisions in estimates of cash flows | (34) | (97)
Ending Balance | 722 | 781
Piedmont Natural Gas [Member] |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 15 | 14
Accretion expense | 1 | 1
Liabilities settled |  | (8)
Liabilities incurred in the current year |  | 8
Revisions in estimates of cash flows | 3 |
Ending Balance | $ 19 | $ 15

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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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