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Related Party Transactions - Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Related Party Transaction [Line Items]      
Commercial finance receivables $ 85,771   $ 84,637
Related Party      
Related Party Transaction [Line Items]      
Commercial finance receivables 600   508
Taxes payable to GM 529   384
Leased vehicle subvention earned 364 $ 393  
Commercial Finance Receivables      
Related Party Transaction [Line Items]      
Commercial finance receivables 14,860   14,216
Commercial Finance Receivables | Revolving Credit Facility | Line of Credit | Cruise      
Related Party Transaction [Line Items]      
Commercial finance receivables due from Cruise 395   353
Commercial Finance Receivables | Related Party      
Related Party Transaction [Line Items]      
Commercial finance receivables 183   164
Commercial loan funding payable to GM 179   55
Interest subvention earned 27 22  
Retail Finance Receivables      
Related Party Transaction [Line Items]      
Commercial finance receivables 70,911   $ 70,421
Retail Finance Receivables | Related Party      
Related Party Transaction [Line Items]      
Interest subvention earned $ 308 $ 257