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Variable Interest Entities (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Mar. 31, 2024
Jun. 30, 2023
Dec. 31, 2023
Mar. 31, 2023
Consolidated [Abstract]        
Total assets $ 276,591   $ 273,064 $ 267,004
GM Financial        
Consolidated [Abstract]        
GM Financial receivables – current 41,682   39,076  
GM Financial receivables – non-current 43,511   45,043  
GM Financial short-term debt and current portion of long-term debt 35,598   38,540  
GM Financial long-term debt 70,312   66,788  
Consolidated VIE | GM Financial        
Consolidated [Abstract]        
Restricted cash – current 3,041   2,398  
Restricted cash – non-current 382   367  
GM Financial receivables – current 22,098   22,990  
GM Financial receivables – non-current 22,341   23,535  
GM Financial equipment on operating leases, net 15,639   15,794  
GM Financial short-term debt and current portion of long-term debt 17,953   22,088  
GM Financial long-term debt 26,319   23,210  
Variable Interest Entity, Not Primary Beneficiary        
Consolidated [Abstract]        
Total assets 2,700   2,400  
Maximum loss exposure amount 3,500   $ 3,500  
Variable Interest Entity, Not Primary Beneficiary | Ultium Cells LLC | Capital Addition Purchase Commitments        
Consolidated [Abstract]        
Committed capital contributions $ 600 $ 800