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Segmented Information - Schedule of Information with Respect to Segment (Parenthetical) (Detail) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Segment Reporting Information [Line Items] |  |  |
Equity loss | $ 211 us-gaap_IncomeLossFromEquityMethodInvestments | $ 196 us-gaap_IncomeLossFromEquityMethodInvestments | $ 151 us-gaap_IncomeLossFromEquityMethodInvestments
Adjusted EBIT | 2,632 mga_AdjustedEarningBeforeInterestAndTax | 2,065 mga_AdjustedEarningBeforeInterestAndTax | 1,658 mga_AdjustedEarningBeforeInterestAndTax
Other (expense) income, net | (64)us-gaap_OtherNonoperatingIncomeExpense | (144)us-gaap_OtherNonoperatingIncomeExpense | 108 us-gaap_OtherNonoperatingIncomeExpense
Interest expense, net | (29)us-gaap_InterestIncomeExpenseNonoperatingNet | (16)us-gaap_InterestIncomeExpenseNonoperatingNet | (16)us-gaap_InterestIncomeExpenseNonoperatingNet
Income from operations before income taxes | 2,539 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 1,905 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest | 1,750 us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Operating Segments [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Adjusted EBIT | 2,632 mga_AdjustedEarningBeforeInterestAndTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 2,065 mga_AdjustedEarningBeforeInterestAndTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember | 1,658 mga_AdjustedEarningBeforeInterestAndTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember
Operating Segments [Member] | Corporate and Other [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Adjusted EBIT | 79 mga_AdjustedEarningBeforeInterestAndTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember | 36 mga_AdjustedEarningBeforeInterestAndTax / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember |
Operating Segments [Member] | Corporate and Other [Member] | E-Car [Member] |  |  |
Segment Reporting Information [Line Items] |  |  |
Equity loss |  |  | $ 35 us-gaap_IncomeLossFromEquityMethodInvestments / us-gaap_BusinessAcquisitionAxis = mga_ECarMember / us-gaap_ConsolidationItemsAxis = us-gaap_OperatingSegmentsMember / us-gaap_StatementBusinessSegmentsAxis = us-gaap_CorporateAndOtherMember

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- Definition Adjusted earning before interest and tax. + References No definition available. + Details
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- Definition This element represents the income or loss from continuing operations attributable to the economic entity which may also be defined as revenue less expenses from ongoing operations, after income or loss from equity method investments, but before income taxes, extraordinary items, and noncontrolling interest. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 20 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35710027&loc=d3e41242-110953 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 10 -Article 5 + Details
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- Definition This item represents the entity's proportionate share for the period of the net income (loss) of its investee (such as unconsolidated subsidiaries and joint ventures) to which the equity method of accounting is applied. This item includes income or expense related to stock-based compensation based on the investor's grant of stock to employees of an equity method investee. + 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 SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755396&loc=d3e33749-111570 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.12) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 04 -Paragraph 11 -Article 7 + Details
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- Definition The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 9 -Article 5 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.9) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 + Details
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