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GM Financial Receivables and Transactions - Allowance for Loan Losses (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
Financing Receivable, Allowance for Credit Loss [Roll Forward]          
Allowance for credit loss 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 $ 2,202 $ 2,027 $ 2,096 $ 1,886  
Provision for loan losses 235 180 533 500  
Charge-offs (366) (289) (1,012) (811)  
Recoveries 196 173 574 511  
Effect of foreign currency and other (8) (4) 67 0  
Allowance for loan losses at end of period $ 2,258 $ 2,086 $ 2,258 $ 2,086