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Related Party Transactions - Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Related Party          
Related Party Transaction [Line Items]          
Subvention receivable from GM $ 558   $ 558   $ 508
Taxes payable to GM 430   430   384
Leased vehicle subvention earned 359 $ 389 723 $ 782  
Commercial Finance Receivables          
Related Party Transaction [Line Items]          
Commercial finance receivables due from dealers consolidated by GM 17,127   17,127   14,251
Commercial Finance Receivables | Revolving Credit Facility | Line of Credit | Cruise          
Related Party Transaction [Line Items]          
Commercial finance receivables due from Cruise 395   395   353
Commercial Finance Receivables | Related Party          
Related Party Transaction [Line Items]          
Commercial finance receivables due from dealers consolidated by GM 226   226   164
Commercial loan funding payable to GM 83   83   55
Interest subvention earned 30 27 57 49  
Retail Finance Receivables          
Related Party Transaction [Line Items]          
Commercial finance receivables due from dealers consolidated by GM 73,335 69,722 73,335 69,722 $ 72,729
Retail Finance Receivables | Related Party          
Related Party Transaction [Line Items]          
Interest subvention earned $ 316 $ 280 $ 624 $ 537