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Business Acquisitions - Additional Information (Detail) (USD $) | 12 Months Ended | 0 Months Ended | 1 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012 | Aug. 31, 2012 | Nov. 30, 2013 | Oct. 31, 2014 | Oct. 26, 2012
Business Acquisition [Line Items] |  |  |  |  |  |  |
Increase in fixed assets | $ 21,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment | $ 5,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedPropertyPlantAndEquipment |  |  |  |  |
Increase in goodwill | 3,000,000 us-gaap_GoodwillPeriodIncreaseDecrease | 3,000,000 us-gaap_GoodwillPeriodIncreaseDecrease |  |  |  |  |
Increase in other assets | 4,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets | 2,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedOtherNoncurrentAssets |  |  |  |  |
Long-term debt | 4,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesLongTermDebt |  |  |  |  |  |
Deferred tax liabilities | 1,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedDeferredTaxLiabilitiesNoncurrent |  |  |  |  |  |
Other long-term liabilities |  | 2,000,000 us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNoncurrentLiabilitiesOther |  |  |  |  |
Reduction of non-controlling interest |  | 1,000,000 us-gaap_MinorityInterestDecreaseFromRedemptions |  |  |  |  |
Net cash outflow | 23,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 9,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | 525,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired |  |  |  |
Company's pro forma consolidated sales | 36,700,000,000 us-gaap_BusinessAcquisitionsProFormaRevenue | 34,900,000,000 us-gaap_BusinessAcquisitionsProFormaRevenue |  |  |  |  |
Proforma consolidated income | 1,900,000,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss | 1,600,000,000 us-gaap_BusinessAcquisitionsProFormaNetIncomeLoss |  |  |  |  |
E-Car [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Interest acquired |  |  |  | 27.00%mga_BusinessAcquisitionPercentageOfInterestAcquired / us-gaap_BusinessAcquisitionAxis = mga_ECarMember |  |  |
Net cash outflow |  |  |  | 56,000,000 us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired / us-gaap_BusinessAcquisitionAxis = mga_ECarMember |  |  |
Cash acquired |  |  |  | 19,000,000 us-gaap_CashAcquiredFromAcquisition / us-gaap_BusinessAcquisitionAxis = mga_ECarMember |  |  |
Textile Competence Centre Kft [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash paid |  |  |  |  | 9,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mga_TextileCompetenceCentreKftMember |  |
Interest acquired |  |  |  |  | 49.00%mga_BusinessAcquisitionPercentageOfInterestAcquired / us-gaap_BusinessAcquisitionAxis = mga_TextileCompetenceCentreKftMember |  |
STT Technologies Inc. [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Interest acquired |  |  |  |  |  |  | 50.00%mga_BusinessAcquisitionPercentageOfInterestAcquired / us-gaap_BusinessAcquisitionAxis = mga_SttTechnologiesMember
Techform Group Of Companies [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Cash paid |  |  |  |  |  | $ 23,000,000 us-gaap_PaymentsToAcquireBusinessesGross / us-gaap_BusinessAcquisitionAxis = mga_TechformGroupOfCompaniesMember |
Acquisition date |  |  |  |  |  | 2014-10 |

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- Definition The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)-(3) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of deferred tax liability attributable to taxable temporary differences due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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- Definition Amount of long-term debt due after one year or the normal operating cycle, if longer, assumed at the acquisition date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=39739317&loc=d3e4845-128472 + Details
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