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Restructuring And Other Initiatives (Details) - USD ($)
$ in Millions
12 Months Ended 24 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2021
Restructuring Reserve [Roll Forward]        
Balance at beginning of period $ 352 $ 564 $ 1,122 $ 564
Additions, interest accretion and other 216 565 629  
Payments (278) (678) (1,101)  
Revisions to estimates and effect of foreign currency (5) (99) (86)  
Balance at end of period 285 352 564 285
Change in valuation allowances $ 665 370 (233)  
GMI | Australia, New Zealand, Thailand and India        
Restructuring Reserve [Roll Forward]        
Restructuring charges and other charges   683    
GMI | Thailand        
Restructuring Reserve [Roll Forward]        
Proceeds from sale of business   143    
GMI | Australia and New Zealand        
Restructuring Reserve [Roll Forward]        
Change in valuation allowances   236    
Dealer Restructurings, Employee Separations and Supplier Claim Charges | GMI | Australia, New Zealand, Thailand and India        
Restructuring Reserve [Roll Forward]        
Restructuring charges and other charges   360    
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs        
Restructuring Reserve [Roll Forward]        
Payments   (333) (1,100)  
Restructuring cost incurred to date     3,100  
Unallocation of Products to Certain Manufacturing Facilities And Other Employee Separation Programs | GMNA        
Restructuring Reserve [Roll Forward]        
Restructuring charges and other charges     1,800  
Asset Impairments, Sales Allowances, Inventory Provisions and Other Charges | GMI | Australia, New Zealand, Thailand and India        
Restructuring Reserve [Roll Forward]        
Restructuring charges and other charges   323    
Dealer Restructuring and Employee Separation Payments | GMI | Australia, New Zealand, Thailand and India        
Restructuring Reserve [Roll Forward]        
Payments   $ (197)   $ (254)
Non-cash Accelerated Depreciation | GMNA        
Restructuring Reserve [Roll Forward]        
Restructuring charges and other charges     1,300  
Supplier Related Charges and Employee Separation Charges | GMNA        
Restructuring Reserve [Roll Forward]        
Restructuring charges and other charges     $ 535