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Earnings Per Share - Computation of Earnings Per Share (Detail) (USD $) In Millions, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income attributable to Magna International Inc.	$ 1,882us-gaap_NetIncomeLoss	$ 1,561us-gaap_NetIncomeLoss	$ 1,433us-gaap_NetIncomeLoss
Weighted average number of Common Shares outstanding during the year	213.6us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	227.9us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	232.4us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Basic earnings per Common Share	$ 8.81us-gaap_EarningsPerShareBasic	$ 6.85us-gaap_EarningsPerShareBasic	$ 6.17us-gaap_EarningsPerShareBasic
Stock options and restricted stock	3.0us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2.9us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements	2.8us-gaap_IncrementalCommonSharesAttributableToShareBasedPaymentArrangements
Diluted	216.6us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	230.8us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	235.2us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding
Diluted earnings per Common Share	$ 8.69us-gaap_EarningsPerShareDiluted	$ 6.76us-gaap_EarningsPerShareDiluted	$ 6.09us-gaap_EarningsPerShareDiluted

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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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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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