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Other Expense, Net - Summary Of Net Losses Or Gains On Investments (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Gain (Loss) on Securities [Line Items]    
Non-cash impairment charges [1] $ 90 $ 0
Other expense, net 201 221
Tax effect (28) (53)
Net loss attributable to Magna 173 168
Public Company Warrants [Member]    
Gain (Loss) on Securities [Line Items]    
Unrealized gain on investment revaluation 110 173
Public and Private Equity Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Unrealized gain on investment revaluation 1 49
Public Equity Investments [Member]    
Gain (Loss) on Securities [Line Items]    
Unrealized gain on investment revaluation $ 0 $ (1)
[1] The non-cash impairment charges relate to impairments of private equity investments and related long-term receivables within Other assets.