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Restructuring and Other Initiatives (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 18 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Restructuring Reserve [Roll Forward]          
Balance at beginning of period $ 275 $ 583 $ 352 $ 564 $ 564
Additions, interest accretion and other 55 35 58 254  
Payments (29) (163) (108) (338)  
Revisions to estimates and effect of foreign currency 2 25 1 0  
Balance at end of period $ 303 480 $ 303 480 303
GMI | Australia, New Zealand, Thailand and India          
Restructuring Reserve [Roll Forward]          
Pre-tax restructuring charges         689
GMI | Australia, New Zealand, Thailand and India | Dealer Restructuring and Employee Separation Payments          
Restructuring Reserve [Roll Forward]          
Payments         (227)
GMI | Australia, New Zealand and Thailand          
Restructuring Reserve [Roll Forward]          
Pre-tax restructuring charges   $ 92   581  
GMI | Australia, New Zealand and Thailand | Asset Impairments, Sales Allowances, Inventory Provisions and Other Charges          
Restructuring Reserve [Roll Forward]          
Pre-tax restructuring charges       335  
GMI | Australia, New Zealand and Thailand | Dealer Restructuring and Employee Separation Payments          
Restructuring Reserve [Roll Forward]          
Pre-tax restructuring charges       246  
GMI | Australia, New Zealand and Thailand | Sales Allowances and Dealer Restructuring          
Restructuring Reserve [Roll Forward]          
Payments       (69)  
GMI | Australia and New Zealand          
Restructuring Reserve [Roll Forward]          
Valuation allowance against deferred tax assets       $ 236  
GMI | Thailand          
Restructuring Reserve [Roll Forward]          
Proceeds from sale of business         $ 143