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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, 2017	Dec. 31, 2016
Basic earnings per Common Share:
Net income attributable to Magna International Inc.	$ 2,206	$ 2,031
Weighted average number of Common Shares outstanding during the year	371.8	391.0
Basic earnings per Common Share	$ 5.93	$ 5.19
Diluted earnings per Common Share:
Net income attributable to Magna International Inc.	$ 2,206	$ 2,031
Weighted average number of Common Shares outstanding during the year	371.8	391.0
Stock options and restricted stock	2.1	2.2
Diluted	373.9	393.2
Diluted earnings per Common Share	$ 5.90	$ 5.16

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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