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Debt and Commitments - Schedule of Company's Long-Term Debt (Detail) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Total long-term debt	$ 995us-gaap_LongTermDebt	$ 332us-gaap_LongTermDebt
Less due within one year	184us-gaap_LongTermDebtCurrent	230us-gaap_LongTermDebtCurrent
Total long term non current debt	811us-gaap_LongTermDebtNoncurrent	102us-gaap_LongTermDebtNoncurrent
Senior Notes [Member]
Debt Instrument [Line Items]
Total long-term debt	750us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = us-gaap_SeniorNotesMember
Bank Term Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	173us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mga_BankTermDebtMember	239us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mga_BankTermDebtMember
Government Loans [Member]
Debt Instrument [Line Items]
Total long-term debt	19us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mga_GovernmentLoansMember	26us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mga_GovernmentLoansMember
Other Long Term Debt [Member]
Debt Instrument [Line Items]
Total long-term debt	$ 53us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mga_OtherLongTermDebtMember	$ 67us-gaap_LongTermDebt / us-gaap_LongtermDebtTypeAxis = mga_OtherLongTermDebtMember

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Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 16

-Article 7



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.22)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Section S99

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-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

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-Number 210

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Reference 6: http://www.xbrl.org/2003/role/presentationRef

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Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19,20)

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+ References

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-Section S99

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