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Variable Interest Entities (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Consolidated [Abstract]      
Assets $ 244,718 $ 235,194 $ 228,037
Nonconsolidated VIE      
Consolidated [Abstract]      
Assets 846    
Maximum loss exposure amount 2,100 1,200  
Nonconsolidated VIE | Capital Commitments | Ultium Cells LLC      
Consolidated [Abstract]      
Committed capital contributions 1,200 776  
GM Financial      
Consolidated [Abstract]      
GM Financial receivables, net of fees – current 26,649 26,209  
GM Financial receivables, net of fees – non-current 36,167 31,783  
GM Financial short-term debt and current portion of long-term debt 33,257 35,637  
GM Financial long-term debt 59,304 56,788  
GM Financial | Variable Interest Entity, Primary Beneficiary      
Consolidated [Abstract]      
Restricted cash - current 2,291 2,190  
Restricted cash - non-current 449 449  
GM Financial receivables, net of fees – current 15,344 17,211  
GM Financial receivables, net of fees – non-current 16,518 15,107  
GM Financial equipment on operating leases, net 16,143 16,322  
GM Financial short-term debt and current portion of long-term debt 19,876 20,450  
GM Financial long-term debt $ 19,401 $ 18,974