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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit of finance receivables, percentage 2.70%   2.70%   2.70%
GM Financial          
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for loan losses at beginning of period $ 2,152 $ 1,928 $ 2,096 $ 1,886  
Provision for loan losses 167 198 298 320  
Charge-offs (323) (247) (645) (521)  
Recoveries 191 161 378 339  
Effect of foreign currency and other 14 (14) 74 4  
Allowance for loan losses at end of period $ 2,202 $ 2,027 $ 2,202 $ 2,027