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Legal Matters and Contingencies | 9 Months Ended
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Sep. 30, 2012
Disclosure Text Block Supplement [Abstract] |
Legal Matters and Contingencies [Text Block] | 12. LITIGATION In February 2012, the International UAW filed suit in the United States District Court for the Eastern District of Michigan, alleging that AAM violated certain provisions of the collective bargaining agreement covering represented hourly associates at the Detroit Manufacturing Complex and Cheektowaga Manufacturing Facility related to pension and postretirement benefits. In the nine months ended September 30, 2012, we recorded $28.7 million in cost of goods sold, of which $28.1 million was recorded in the second quarter of 2012, related to pension and postretirement benefits to be provided to certain eligible UAW associates as a result of our election to apply MAP-21 and the subsequent recertification of our U.S. hourly pension plan. See Note 7 - Employee Benefit Plans for more detail about these incremental benefit accruals. We do not expect the resolution of this litigation to have a significant impact on our results of operations in future periods.

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- Definition The entire disclosure for legal proceedings, legal contingencies, litigation, regulatory and environmental matters and other contingencies. + References No definition available. + Details
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