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Conversion Ratio Business Combination, Common Stock, Conversion Ratio Foreign Currency Contracts, Liability, Carrying and Fair Value Disclosure Foreign Currency Contracts, Liability, Carrying and Fair Value Disclosure Foreign Currency Contracts, Liability, Carrying and Fair Value Disclosure Current assets Assets, Current [Abstract] Business Combination, Pro Forma Information, Pro Forma Revenue Business Combination, Pro Forma Information, Pro Forma Revenue 6.375% Notes & 7.75% Notes 6.375% Notes & 7.75% Notes [Member] 6.375% Notes & 7.75% Notes Defined benefit plans, amounts reclassified from accumulated other comprehensive income (loss) Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax Entity Address, Address Line One Entity Address, Address Line One Hefei AAM Automotive Driveline & Chassis System Co., Ltd. and Liuzhou AAM Automotive Driveline System Co., Ltd. Hefei AAM Automotive Driveline & Chassis System Co., Ltd. and Liuzhou AAM Automotive Driveline System Co., Ltd. [Member] Hefei AAM Automotive Driveline & Chassis System Co., Ltd. and Liuzhou AAM Automotive Driveline System Co., Ltd. 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Liability, Other Postretirement Defined Benefit Plan, Noncurrent Liability, Other Postretirement Defined Benefit Plan, Noncurrent Derivative Instruments and Hedging Activities Disclosure [Abstract] Derivative Instruments and Hedging Activities Disclosure [Abstract] Chief Executive Officer [Member]