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Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($)
$ / shares in Units, shares in Millions, $ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Basic earnings per Common Share:    
Net income attributable to Magna International Inc. $ 1,213 $ 592
Weighted average number of Common Shares outstanding during the year 286.2 290.4
Basic earnings per Common Share $ 4.24 $ 2.04
Diluted earnings per Common Share:    
Net income attributable to Magna International Inc. $ 1,213 $ 592
Weighted average number of Common Shares outstanding during the year 286.2 290.4
Stock options and restricted stock 0.4 0.8
Diluted 286.6 291.2
Diluted earnings per Common Share $ 4.23 $ 2.03