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Related Party Transactions - Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM $ 81,650   $ 81,650   $ 74,514
Revolving Credit Facility | Line of Credit | Cruise          
Related Party Transaction [Line Items]          
Long-term line of credit 276   276   113
Related Party          
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM 837   837   469
Leased vehicle subvention earned 382 $ 456 1,165 $ 1,503  
Commercial Finance Receivables          
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM 12,170   12,170   11,254
Commercial Finance Receivables | Related Party          
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM 163   163   187
Commercial loan funding payable 62   62   105
Taxes payable 412   412   8
Interest subvention earned 30 17 79 41  
Retail Finance Receivables          
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM 69,480   69,480   $ 63,260
Retail Finance Receivables | Related Party          
Related Party Transaction [Line Items]          
Interest subvention earned $ 289 $ 242 $ 826 $ 674