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Significant Accounting Policies - Equipment (Details)	12 Months Ended
	Dec. 31, 2024
Exploration and other equipment
Significant Accounting Policies
Depreciation rate	30.00%
Office equipment
Significant Accounting Policies
Depreciation rate	30.00%

X

- Definition

Represents the depreciation rate of property, plant and equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	tmc_
Data Type:	dtr-types:percentItemType
Balance Type:	na
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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

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Details

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Namespace Prefix:
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Balance Type:
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X

- Details

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Period Type: