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GM Financial Receivables and Transactions - Allowance for Loan Losses (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for credit loss of finance receivables, percentage 2.70% 2.70%  
GM Financial      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Allowance for loan losses at beginning of period $ 2,096 $ 1,886 $ 1,978
Provision for loan losses 826 654 248
Charge-offs (1,423) (1,138) (897)
Recoveries 768 686 574
Effect of foreign currency 76 9 (17)
Allowance for loan losses at end of period $ 2,344 $ 2,096 $ 1,886