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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%

X

- Definition

Maximum estimated expenditure for five year period.

+ References

No definition available.

+ Details

Name:	tmc_MaximumEstimatedExpenditureForFiveYearPeriod
Namespace Prefix:	tmc_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The percentage of annual quantity of production committed to supply one or more customers.

+ References

No definition available.

+ Details

Name:	tmc_SupplyCommitmentPercentOfProductionCommitted
Namespace Prefix:	tmc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

X

- 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

X

- Details

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

X

- Details

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