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Other Expense, Net - Summary of Net Losses or Gains on Investments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Gain (Loss) on Securities [Line Items]    
Non-cash impairment charges [1] $ 13 $ 90
Other expense, net 9 91
Tax effect 3 (1)
Net loss attributable to Magna 12 90
Public Company Warrants [Member]    
Gain (Loss) on Securities [Line Items]    
Revaluation of public company warrants (17) 0
Public and Private Equity Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Unrealized gain on investment revaluation $ 13 $ 1
[1] The non-cash impairment charges relate to impairments of private equity investments and related long-term receivables within Other assets.