Commitments and Contingencies (Narrative) (Details) $ in Millions		12 Months Ended	58 Months Ended
	Jun. 16, 2021 people	Dec. 31, 2021 USD ($) reactor plant	Dec. 31, 2021 USD ($) reactor plant	Feb. 09, 2022 USD ($)	Dec. 31, 2020 USD ($)	Jun. 18, 2018 USD ($)
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		95	95
Insured public liability limit per nuclear incident		$ 13,500.0	$ 13,500.0
Excess nuclear liability program coverage		13,100.0	13,100.0
Pro rata assessment for each reactor owned for each incident exceeding public liability insurance		138.0	138.0
Annual payment limit to pro rata assessments		20.5	20.5
Industry aggregate limit		3,200.0	3,200.0
Sublimit for non-nuclear terrorist events		1,800.0	1,800.0
Sublimit property damage losses		1,500.0	1,500.0
Additional nuclear accident limit		$ 1,250.0	$ 1,250.0
Insurance coverage percentage initial weeks		100.00%	100.00%
Accidental outage insurance coverage initial weeks		365 days
Insurance coverage percentage additional weeks		80.00%	80.00%
Accidental outage insurance coverage additional weeks		770 days
Weeks of sublimits for accidental outage coverage		728 days
Sublimit accidental outage recovery		$ 328.0	$ 328.0
Maximum magnitude of retroactive premiums		10	10
Maximum period for retroactive premium assessment		6 years
Coal Ash Insurance Coverage Litigation
Loss Contingencies [Line Items]
Number of NC and SC plants with ash basins | plant		15	15
Duke Energy Carolinas
Loss Contingencies [Line Items]
Primary nuclear liability program coverage		$ 450.0	$ 450.0
Max retroactive premium assessments		$ 140.0
Duke Energy Carolinas | Catawba
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		2	2
Dedicated additional nuclear accident limit		$ 1,250.0	$ 1,250.0
Additional Non-nuclear accident limit		750.0	750.0
Accidental outage insurance coverage policy limit		$ 490.0	$ 490.0
Potential obligation percentage		100.00%	100.00%
Duke Energy Carolinas | McGuire
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		2	2
Accidental outage insurance coverage policy limit		$ 434.0	$ 434.0
Duke Energy Carolinas | Oconee
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		3	3
Additional Non-nuclear accident limit		$ 750.0	$ 750.0
Accidental outage insurance coverage policy limit		322.0	322.0
Duke Energy Carolinas | Ruben Villano, et al. v. Duke Energy Carolinas, LLC | Pending Litigation
Loss Contingencies [Line Items]
Number of individuals | people	9
Number of survivors | people	4
Number of deceased individuals | people	5
Duke Energy Carolinas | Asbestos Issue
Loss Contingencies [Line Items]
Asbestos-related injuries and damages reserves		501.0	501.0		$ 572.0
Loss contingency, receivable, noncurrent		644.0	644.0		704.0
Duke Energy Progress
Loss Contingencies [Line Items]
Primary nuclear liability program coverage		450.0	$ 450.0
Max retroactive premium assessments		$ 88.0
Duke Energy Progress | Harris
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		1	1
Accidental outage insurance coverage policy limit		$ 364.0	$ 364.0
Duke Energy Progress | Robinson
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		1	1
Accidental outage insurance coverage policy limit		$ 280.0	$ 280.0
Duke Energy Progress | Brunswick
Loss Contingencies [Line Items]
Number of licensed nuclear reactors | reactor		2	2
Accidental outage insurance coverage policy limit		$ 336.0	$ 336.0
Duke Energy Progress | Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Damages sought						$ 100.0
Duke Energy Florida
Loss Contingencies [Line Items]
Primary nuclear liability program coverage		100.0	100.0
Max retroactive premium assessments		1.0
Duke Energy Florida | Crystal River Unit 3
Loss Contingencies [Line Items]
Sublimit property damage losses		50.0	50.0
Duke Energy Florida | Spent Nuclear Fuel Matters
Loss Contingencies [Line Items]
Damages sought						$ 200.0
Duke Energy Florida | Spent Nuclear Fuel Matters | Subsequent Event
Loss Contingencies [Line Items]
Damages sought				$ 60.0
Duke Energy Carolinas and Duke Energy Progress | Coal Ash Insurance Coverage Litigation
Loss Contingencies [Line Items]
Proceeds from legal settlements			418.0
Duke Energy and Duke Energy Carolinas | ASU 2016-13
Loss Contingencies [Line Items]
Premium receivable, allowance for credit loss		$ 12.0	$ 12.0		$ 15.0