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Other Expense (Income), Net - Other Expense (Income), Net (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2012 | Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Impairment of goodwill |  |  | $ 22 us-gaap_GoodwillImpairmentLoss |
Other expense (income), net |  | 64 us-gaap_OtherOperatingIncomeExpenseNet | 144 us-gaap_OtherOperatingIncomeExpenseNet | (108)us-gaap_OtherOperatingIncomeExpenseNet
North America [Member] |  |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Impairment of long-lived assets |  | 18 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 23 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 2 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Re-measurement gain |  |  |  | (35)us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Other expense (income), net |  | 18 us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | 23 us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember | (33)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementGeographicalAxis = us-gaap_NorthAmericaMember
Europe [Member] |  |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Restructuring charges |  | 46 us-gaap_RestructuringCharges / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 89 us-gaap_RestructuringCharges / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 55 us-gaap_RestructuringCharges / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Impairment of long-lived assets | 23 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember |  |  | 23 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Other expense (income), net |  | 46 us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 89 us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember | 78 us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementGeographicalAxis = us-gaap_EuropeMember
Rest of World [Member] |  |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Impairment of long-lived assets |  |  | 10 us-gaap_ImpairmentOfLongLivedAssetsHeldForUse / us-gaap_StatementGeographicalAxis = mga_RestOfWorldMember |
Impairment of goodwill |  |  | 22 us-gaap_GoodwillImpairmentLoss / us-gaap_StatementGeographicalAxis = mga_RestOfWorldMember |
Other expense (income), net |  |  | 32 us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementGeographicalAxis = mga_RestOfWorldMember |
Corporate [Member] |  |  |  |
Component of Operating Other Cost and Expense [Abstract] |  |  |  |
Re-measurement gain |  |  |  | (153)us-gaap_BusinessCombinationStepAcquisitionEquityInterestInAcquireeRemeasurementGain / us-gaap_StatementGeographicalAxis = us-gaap_CorporateMember
Other expense (income), net |  |  |  | $ (153)us-gaap_OtherOperatingIncomeExpenseNet / us-gaap_StatementGeographicalAxis = us-gaap_CorporateMember

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- Definition In a business combination achieved in stages, this element represents the amount of gain recognized by the entity as a result of remeasuring to fair value the equity interest in the acquiree it held before the business combination. + 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 (g)(2) -URI http://asc.fasb.org/extlink&oid=25497992&loc=d3e1392-128463 + Details
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- Definition Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13854-109267 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13777-109266 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267 + Details
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- Definition The aggregate amount of write-downs for impairments recognized during the period for long lived assets held for use (including those held for disposal by means other than sale). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6391110&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 958 -SubTopic 225 -Section 45 -Paragraph 11 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=28367520&loc=d3e92212-112881 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Impairment -URI http://asc.fasb.org/extlink&oid=6515133 + Details
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- Definition The net amount of other operating income and expenses, the components of which are not separately disclosed on the income statement, from items that are associated with the entity's normal revenue producing operations. + References No definition available. + Details
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- Definition Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB TOPIC 5.P.4(b)) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140904-122747 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 5.P.3) -URI http://asc.fasb.org/extlink&oid=27011515&loc=d3e140864-122747 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 5 -Section P -Subsection 3, 4 + Details
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