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Leases (Lease Costs) (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items] |
Operating lease expense | $ 292
Short-term lease expense | 16
Variable lease expense | 47
Finance lease expense |
Amortization of leased assets | 111
Interest on lease liabilities | 61
Total finance lease expense | 172
Total lease expense | 527
Duke Energy Carolinas |
Lessee, Lease, Description [Line Items] |
Operating lease expense | 47
Short-term lease expense | 5
Variable lease expense | 22
Finance lease expense |
Amortization of leased assets | 6
Interest on lease liabilities | 15
Total finance lease expense | 21
Total lease expense | 95
Progress Energy |
Lessee, Lease, Description [Line Items] |
Operating lease expense | 161
Short-term lease expense | 9
Variable lease expense | 22
Finance lease expense |
Amortization of leased assets | 21
Interest on lease liabilities | 42
Total finance lease expense | 63
Total lease expense | 255
Duke Energy Progress |
Lessee, Lease, Description [Line Items] |
Operating lease expense | 69
Short-term lease expense | 4
Variable lease expense | 16
Finance lease expense |
Amortization of leased assets | 5
Interest on lease liabilities | 33
Total finance lease expense | 38
Total lease expense | 127
Duke Energy Florida |
Lessee, Lease, Description [Line Items] |
Operating lease expense | 92
Short-term lease expense | 5
Variable lease expense | 6
Finance lease expense |
Amortization of leased assets | 16
Interest on lease liabilities | 9
Total finance lease expense | 25
Total lease expense | 128
Duke Energy Ohio |
Lessee, Lease, Description [Line Items] |
Operating lease expense | 11
Short-term lease expense | 1
Finance lease expense |
Amortization of leased assets | 1
Total finance lease expense | 1
Total lease expense | 13
Duke Energy Indiana |
Lessee, Lease, Description [Line Items] |
Operating lease expense | 20
Short-term lease expense | 2
Variable lease expense | 1
Finance lease expense |
Interest on lease liabilities | 1
Total finance lease expense | 1
Total lease expense | 24
Piedmont |
Lessee, Lease, Description [Line Items] |
Operating lease expense | 5
Variable lease expense | 1
Finance lease expense |
Total lease expense | $ 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=77888426&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=77888419&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=77888399&loc=SL77918982-209971 + Details
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