XML 81 R113.htm IDEA: XBRL DOCUMENT v2.4.0.6

Segmented Information (Details 1) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Aggregates external revenues by customer
Revenue from external customers	$ 28,748	$ 23,465	$ 16,876
General Motors [Member]
Aggregates external revenues by customer
Revenue from external customers	6,202	4,731	3,141
BMW [Member]
Aggregates external revenues by customer
Revenue from external customers	4,191	3,090	2,850
Fiat or Chrysler Group [Member]
Aggregates external revenues by customer
Revenue from external customers	3,864	3,102	1,817
Ford Motor Company [Member]
Aggregates external revenues by customer
Revenue from external customers	3,549	3,371	2,525
Volkswagen [Member]
Aggregates external revenues by customer
Revenue from external customers	3,187	2,567	2,001
Daimler AG [Member]
Aggregates external revenues by customer
Revenue from external customers	2,793	2,354	1,757
Other [Member]
Aggregates external revenues by customer
Revenue from external customers	$ 4,962	$ 4,250	$ 2,785

X

- Details

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

X

- Definition

Amount of revenue from external customers for the reportable segment. Such disclosure is presented if the amount is: (a) included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 131

-Paragraph 27

-Subparagraph a

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

+ Details

Name:	us-gaap_RevenuesFromExternalCustomers
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration