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Commitments and Contingencies (Schedule of Environmental Loss Contingencies) (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 87 | $ 88
Duke Energy Carolinas |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 19 | 19
Progress Energy |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 23 | 23
Duke Energy Progress |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 11 | 11
Duke Energy Florida |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 11 | 11
Duke Energy Ohio |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 33 | 34
Duke Energy Indiana |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | 4 | 4
Piedmont |  |
Environmental Matters Details [Line Items] |  |
Reserves for Environmental Remediation | $ 8 | $ 9

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- Definition Total costs accrued as of the balance sheet date for environmental loss contingencies. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121557415&loc=d3e14326-108349 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6395460&loc=d3e13647-108346 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 410 -SubTopic 30 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6393242&loc=d3e13207-110859 + Details
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