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Related Party Transactions - Transactions (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM(a) $ 66,847   $ 66,847   $ 62,979
Commercial Finance Receivables          
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM(a) 7,626   7,626   6,725
Retail Finance Receivables          
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM(a) 59,220   59,220   56,254
Affiliated Entity          
Related Party Transaction [Line Items]          
Subvention receivable 475   475   282
Leased vehicle subvention earned 500 $ 704 1,047 $ 1,425  
Affiliated Entity | Commercial Finance Receivables          
Related Party Transaction [Line Items]          
Commercial finance receivables, net due from dealers consolidated by GM(a) 133   133   163
Commercial loan funding payable 41   41   26
Taxes payable 37   37   $ 282
Interest subvention earned 14 7 24 16  
Affiliated Entity | Retail Finance Receivables          
Related Party Transaction [Line Items]          
Interest subvention earned 221 204 431 383  
GM          
Related Party Transaction [Line Items]          
Revenue from related parties $ 561 $ 1,000 $ 1,000 $ 2,000