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Investment in Joint Ventures Consolidation, Less than Wholly Owned Subsidiary (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		36 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2008
Business Acquisition [Line Items]
Noncontrolling Interest, Ownership Percentage by Parent	67.00%
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners	33.00%
Consolidation, Less than Wholly Owned Subsidiary, Total Cash Contribution per Joint Venture Agreement			$ 26
Consolidation, Less than Wholly Owned Subsidiary, Amount Paid During Period	16	5
Acquired Finite-lived Intangible Asset, Amount		8.7		9.6
Business Acquisition, Purchase Price Allocation, Goodwill Amount		$ 8.0

X

- Definition

Represents the amount paid to e-AAM during the period associated with the agreement to fund $26M from 2010 through 2012 as part of the joint venture agreement.

+ References

No definition available.

+ Details

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X

- Definition

Represents the total agreed-upon amount, per the joint venture agreement, to be paid by AAM to e-AAM over the period 2010 through 2012.

+ References

No definition available.

+ Details

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X

- Definition

The aggregate amount assigned to a major class of finite-lived intangible assets acquired either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 142

-Paragraph 44

-Subparagraph a(1)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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.



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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6905858&loc=d3e16265-109275

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- Definition

Amount of goodwill arising from a business combination, which is the excess of the cost of the acquired entity over the amounts assigned to assets acquired and liabilities assumed.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 52

-Subparagraph c

-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.



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 141

-Paragraph 53

-Subparagraph d

-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.

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X

- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

+ References

No definition available.

+ Details

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- Definition

The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

+ References

No definition available.

+ Details

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