Description of the Plan - Participant and Non-Participant Directed Investments (Details) - The Magna Group of Companies Retirement Savings Plans - Employer's securities	12 Months Ended
Dec. 31, 2025
Description of the Plan
Maximum diversification percent	100.00%
Non-participant directed \| Deferred Profit - Sharing
Description of the Plan
Deferred profit sharing (as a percent)	57.14%

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 962
-SubTopic 205
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147478416/962-205-50-1

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