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Variable Interest Entities (Details) - USD ($)
$ in Millions
 9 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Sep. 30, 2021
Consolidated [Abstract]      
Total assets $ 260,529 $ 244,718 $ 238,557
GM Financial      
Consolidated [Abstract]      
GM Financial receivables, net of fees – current 31,049 26,649  
GM Financial receivables, net of fees – non-current 39,551 36,167  
GM Financial short-term debt and current portion of long-term debt 34,634 33,257  
GM Financial long-term debt 59,190 59,304  
Consolidated VIE | GM Financial      
Consolidated [Abstract]      
Restricted cash – current 2,106 2,291  
Restricted cash – non-current 380 449  
GM Financial receivables, net of fees – current 18,019 15,344  
GM Financial receivables, net of fees – non-current 17,883 16,518  
GM Financial equipment on operating leases, net 17,143 16,143  
GM Financial short-term debt and current portion of long-term debt 20,413 19,876  
GM Financial long-term debt 20,301 19,401  
Variable Interest Entity, Not Primary Beneficiary      
Consolidated [Abstract]      
Total assets 1,500 850  
Maximum loss exposure amount 3,200 2,100  
Variable Interest Entity, Not Primary Beneficiary | Ultium Cells LLC | Capital Addition Purchase Commitments      
Consolidated [Abstract]      
Maximum loss exposure amount 750    
Committed capital contributions $ 1,600 $ 1,200