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Related Party Transactions - Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Related Party Transaction [Line Items]      
Commercial finance receivables, net due from dealers consolidated by GM $ 76,178   $ 74,514
Revolving Credit Facility | Line of Credit | Cruise      
Related Party Transaction [Line Items]      
Long-term line of credit 151   113
Commercial Finance Receivables      
Related Party Transaction [Line Items]      
Commercial finance receivables, net due from dealers consolidated by GM 10,597   11,254
Retail Finance Receivables      
Related Party Transaction [Line Items]      
Commercial finance receivables, net due from dealers consolidated by GM 65,581   63,260
Affiliated Entity      
Related Party Transaction [Line Items]      
Subvention receivable 594   469
Leased vehicle subvention earned 393 $ 547  
Affiliated Entity | Commercial Finance Receivables      
Related Party Transaction [Line Items]      
Commercial finance receivables, net due from dealers consolidated by GM 163   187
Commercial loan funding payable 72   105
Taxes payable 374   $ 8
Interest subvention earned 22 10  
Affiliated Entity | Retail Finance Receivables      
Related Party Transaction [Line Items]      
Interest subvention earned $ 257 $ 210