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Earnings Per Share - Computation of Earnings Per Share (Detail) - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Earnings Per Share [Abstract]
Net income from continuing operations	$ 1,940	$ 1,922
Loss from continuing operations attributable to non-controlling interests	6	2
Net income attributable to Magna International Inc. from continuing operations	1,946	1,924
Income (loss) from discontinued operations, net of tax	67	(42)
Net income attributable to Magna International Inc.	$ 2,013	$ 1,882
Basic	407.5	427.1
Stock options and restricted stock	5.2	6.1
Diluted	412.7	433.2

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Amount of income (loss) from continuing operations attributable to the parent. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Amount of income (loss) from continuing operations attributable to the noncontrolling interest. Also defined as revenue less expenses and taxes from ongoing operations before extraordinary items but after deduction of those portions of income or loss from continuing operations that are allocable to noncontrolling interests.

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Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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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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