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Leases (Lease Costs) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | $ 283 | $ 292
Short-term lease expense | 4 | 16
Variable lease expense | 30 | 47
Finance lease expense |  |
Amortization of leased assets | 119 | 111
Interest on lease liabilities | 61 | 61
Total finance lease expense | 180 | 172
Total lease expense | 497 | 527
Duke Energy Carolinas |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 53 | 47
Short-term lease expense |  | 5
Variable lease expense | 13 | 22
Finance lease expense |  |
Amortization of leased assets | 8 | 6
Interest on lease liabilities | 30 | 15
Total finance lease expense | 38 | 21
Total lease expense | 104 | 95
Progress Energy |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 162 | 161
Short-term lease expense | 2 | 9
Variable lease expense | 13 | 22
Finance lease expense |  |
Amortization of leased assets | 24 | 21
Interest on lease liabilities | 44 | 42
Total finance lease expense | 68 | 63
Total lease expense | 245 | 255
Duke Energy Progress |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 72 | 69
Short-term lease expense | 1 | 4
Variable lease expense | 5 | 16
Finance lease expense |  |
Amortization of leased assets | 6 | 5
Interest on lease liabilities | 37 | 33
Total finance lease expense | 43 | 38
Total lease expense | 121 | 127
Duke Energy Florida |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 90 | 92
Short-term lease expense | 1 | 5
Variable lease expense | 8 | 6
Finance lease expense |  |
Amortization of leased assets | 18 | 16
Interest on lease liabilities | 7 | 9
Total finance lease expense | 25 | 25
Total lease expense | 124 | 128
Duke Energy Ohio |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 11 | 11
Short-term lease expense | 0 | 1
Variable lease expense | 0 |
Finance lease expense |  |
Amortization of leased assets | 0 | 1
Interest on lease liabilities | 0 | 0
Total finance lease expense | 0 | 1
Total lease expense | 11 | 13
Duke Energy Indiana |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 19 | 20
Short-term lease expense | 1 | 2
Variable lease expense | 1 | 1
Finance lease expense |  |
Amortization of leased assets | 1 | 0
Interest on lease liabilities | 0 | 1
Total finance lease expense | 1 | 1
Total lease expense | 22 | 24
Piedmont |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease expense | 7 | 5
Short-term lease expense | 0 |
Variable lease expense | 1 | 1
Finance lease expense |  |
Amortization of leased assets | 0 |
Interest on lease liabilities | 0 | 0
Total finance lease expense |  | 0
Total lease expense | $ 8 | $ 6

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- Definition Amount of interest expense on finance lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918638-209977 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 + Details
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- Definition Amount of single lease cost, calculated by allocation of remaining cost of lease over remaining lease term. Includes, but is not limited to, single lease cost, after impairment of right-of-use asset, calculated by amortization of remaining right-of-use asset and accretion of lease liability. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 55 -Paragraph 53 -URI http://asc.fasb.org/extlink&oid=121568110&loc=SL77918982-209971 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918686-209980 + Details
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