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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, 2024
Dec. 31, 2023
Basic earnings per Common Share:    
Net income attributable to Magna International Inc. $ 1,009 $ 1,213
Weighted average number of Common Shares outstanding during the year 286.8 286.2
Basic earnings per Common Share $ 3.52 $ 4.24
Diluted earnings per Common Share:    
Net income attributable to Magna International Inc. $ 1,009 $ 1,213
Weighted average number of Common Shares outstanding during the year 286.8 286.2
Stock options and restricted stock 0.1 0.4
Diluted 286.9 286.6
Diluted earnings per Common Share $ 3.52 $ 4.23