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Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 | May 25, 2012
Tonga Off shore Mining Limited |  |
Commitments and Contingent Liabilities |  |
Commitments plan submission period (in years) | 5 years |
Maximum estimated expenditure for five year period | $ 44 |
DeepGreen Engineering Pte Ltd |  |
Commitments and Contingent Liabilities |  |
Percentage of annual production committed to Glencore |  | 50.00%

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- Definition Maximum estimated expenditure for five year period. + References No definition available. + Details
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Namespace Prefix: | tmc_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The percentage of annual quantity of production committed to supply one or more customers. + References No definition available. + Details
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Namespace Prefix: | tmc_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Period covered by the long-term purchase commitment, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | us-gaap_LongtermPurchaseCommitmentPeriod
Namespace Prefix: | us-gaap_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
Name: | dei_LegalEntityAxis=tmc_TongaOffshoreMiningLimitedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | dei_LegalEntityAxis=tmc_DeepgreenEngineeringPteLtdMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |