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Variable Interest Entities (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Consolidated [Abstract]      
Total assets $ 251,492 $ 244,718 $ 238,411
GM Financial      
Consolidated [Abstract]      
GM Financial receivables, net of fees – current 28,440 26,649  
GM Financial receivables, net of fees – non-current 36,408 36,167  
GM Financial short-term debt and current portion of long-term debt 32,300 33,257  
GM Financial long-term debt 60,613 59,304  
Consolidated VIE | GM Financial      
Consolidated [Abstract]      
Restricted cash – current 2,546 2,291  
Restricted cash – non-current 407 449  
GM Financial receivables, net of fees – current 14,518 15,344  
GM Financial receivables, net of fees – non-current 15,799 16,518  
GM Financial equipment on operating leases, net 16,148 16,143  
GM Financial short-term debt and current portion of long-term debt 18,210 19,876  
GM Financial long-term debt 19,079 19,401  
Variable Interest Entity, Not Primary Beneficiary      
Consolidated [Abstract]      
Total assets 1,000 850  
Maximum loss exposure amount 2,100 2,100  
Variable Interest Entity, Not Primary Beneficiary | Ultium Cells LLC | Capital Addition Purchase Commitments      
Consolidated [Abstract]      
Committed capital contributions $ 1,000 $ 1,200