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Accumulated Other Comprehensive Income (Details Textual) (USD $) In Millions, unless otherwise specified	Dec. 31, 2012
Accumulated other comprehensive income (Textual) [Abstract]
Amount of other comprehensive income is expected to be reclassified to net income	$ 9
Amount of other comprehensive income net of income tax	$ 3

X

- Details

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Namespace Prefix:	mga_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Income Tax portion of other comprehensive income that is expected to be reclassified to net income over the next fiscal year.

+ References

No definition available.

+ Details

Name:	mga_IncomeTaxOfOtherComprehensiveIncomeToBeReclassifiedToNetIncome
Namespace Prefix:	mga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Other comprehensive income that is expected to be reclassified to net income over the next fiscal year, net of tax.

+ References

No definition available.

+ Details

Name:	mga_OtherComprehensiveIncomeToBeReclassifiedToNetIncome
Namespace Prefix:	mga_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant