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Asset Retirement Obligations (Rollforward) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | $ 10,467 | $ 10,175
Accretion expense | 508 | 427
Liabilities settled | (895) | (638)
Liabilities incurred in the current year | 25 | 39
Revisions in estimates of cash flows | 3,213 | 464
Ending Balance | 13,318 | 10,467
Duke Energy Carolinas |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 3,949 | 3,610
Accretion expense | 235 | 179
Liabilities settled | (329) | (281)
Liabilities incurred in the current year | 18 | 8
Revisions in estimates of cash flows | 1,861 | 433
Ending Balance | 5,734 | 3,949
Progress Energy |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 5,411 | 5,414
Accretion expense | 252 | 225
Liabilities settled | (499) | (272)
Liabilities incurred in the current year | 7 | 5
Revisions in estimates of cash flows | 1,300 | 39
Ending Balance | 6,471 | 5,411
Duke Energy Progress |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 4,820 | 4,673
Accretion expense | 227 | 196
Liabilities settled | (460) | (227)
Revisions in estimates of cash flows | 1,306 | 178
Ending Balance | 5,893 | 4,820
Duke Energy Florida |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 591 | 742
Accretion expense | 25 | 29
Liabilities settled | (39) | (45)
Liabilities incurred in the current year | 7 | 5
Revisions in estimates of cash flows | (6) | (140)
Ending Balance | 578 | 591
Duke Energy Ohio |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 93 | 84
Accretion expense | 3 | 4
Liabilities settled | (12) | (5)
Revisions in estimates of cash flows | (4) | 10
Ending Balance | 80 | 93
Duke Energy Indiana |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 722 | 781
Accretion expense | 28 | 29
Liabilities settled | (54) | (79)
Liabilities incurred in the current year |  | 25
Revisions in estimates of cash flows | 136 | (34)
Ending Balance | 832 | 722
Piedmont |  |
Asset Retirement Obligation [Line Items] |  |
Beginning Balance | 19 | 15
Accretion expense | 1 | 1
Revisions in estimates of cash flows | (3) | 3
Ending Balance | $ 17 | $ 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 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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