Leases (Operating Lease Maturities) (Details) $ in Millions	Dec. 31, 2020 USD ($)
Lessee, Operating Lease, Liability, Payment, Due
2021	$ 229
2022	212
2023	202
2024	186
2025	162
Thereafter	870
Total operating lease payments	1,861
Less: present value discount	(344)
Total operating lease liabilities	1,517
Duke Energy Carolinas
Lessee, Operating Lease, Liability, Payment, Due
2021	24
2022	22
2023	20
2024	14
2025	10
Thereafter	51
Total operating lease payments	141
Less: present value discount	(24)
Total operating lease liabilities	117
Progress Energy
Lessee, Operating Lease, Liability, Payment, Due
2021	99
2022	95
2023	95
2024	95
2025	85
Thereafter	376
Total operating lease payments	845
Less: present value discount	(149)
Total operating lease liabilities	696
Duke Energy Progress
Lessee, Operating Lease, Liability, Payment, Due
2021	44
2022	40
2023	41
2024	41
2025	31
Thereafter	252
Total operating lease payments	449
Less: present value discount	(95)
Total operating lease liabilities	354
Duke Energy Florida
Lessee, Operating Lease, Liability, Payment, Due
2021	55
2022	55
2023	54
2024	54
2025	54
Thereafter	124
Total operating lease payments	396
Less: present value discount	(54)
Total operating lease liabilities	342
Duke Energy Ohio
Lessee, Operating Lease, Liability, Payment, Due
2021	2
2022	2
2023	2
2024	2
2025	2
Thereafter	20
Total operating lease payments	30
Less: present value discount	(9)
Total operating lease liabilities	21
Duke Energy Indiana
Lessee, Operating Lease, Liability, Payment, Due
2021	5
2022	4
2023	4
2024	4
2025	4
Thereafter	59
Total operating lease payments	80
Less: present value discount	(24)
Total operating lease liabilities	56
Piedmont
Lessee, Operating Lease, Liability, Payment, Due
2021	5
2022	5
2023	5
2024	5
2025	5
Total operating lease payments	25
Less: present value discount	(2)
Total operating lease liabilities	$ 23

Amount of lessee's undiscounted obligation for lease payment for operating lease.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments for operating lease, due after fifth rolling twelve months following latest statement of financial position date. For interim and annual periods when interim periods are reported on rolling approach, from latest statement of financial position date.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=121609121&loc=SL77918701-209980

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Amount of lessee's undiscounted obligation for lease payments in excess of discounted obligation for lease payments for operating lease.

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Present value of lessee's discounted obligation for lease payments from operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977

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