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Restructuring and Other Initiatives (Details) - USD ($)
$ in Millions
3 Months Ended 15 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Restructuring Reserve [Roll Forward]      
Balance at beginning of period $ 352 $ 564 $ 564
Additions, interest accretion and other 3 219  
Payments (79) (175)  
Revisions to estimates and effect of foreign currency (1) (25)  
Balance at end of period $ 275 583 275
GMI | Australia, New Zealand, Thailand and India      
Restructuring Reserve [Roll Forward]      
Pre-tax restructuring charges     687
GMI | Australia, New Zealand, Thailand and India | Dealer Restructuring and Employee Separation Payments      
Restructuring Reserve [Roll Forward]      
Payments     (221)
GMI | Australia, New Zealand and Thailand      
Restructuring Reserve [Roll Forward]      
Pre-tax restructuring charges   489  
GMI | Australia, New Zealand and Thailand | Asset Impairments, Sales Allowances, Inventory Provisions and Other Charges      
Restructuring Reserve [Roll Forward]      
Pre-tax restructuring charges   270  
GMI | Australia, New Zealand and Thailand | Dealer Restructuring and Employee Separation Payments      
Restructuring Reserve [Roll Forward]      
Pre-tax restructuring charges   219  
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