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Related Party Transactions - Transactions (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Related Party Transaction [Line Items]      
Commercial finance receivables, net due from dealers consolidated by GM(a) $ 64,970   $ 62,979
Commercial Finance Receivables      
Related Party Transaction [Line Items]      
Commercial finance receivables, net due from dealers consolidated by GM(a) 7,352   6,725
Retail Finance Receivables      
Related Party Transaction [Line Items]      
Commercial finance receivables, net due from dealers consolidated by GM(a) 57,618   56,254
Affiliated Entity      
Related Party Transaction [Line Items]      
Subvention receivable 357   282
Leased vehicle subvention earned 547 $ 721  
Affiliated Entity | Commercial Finance Receivables      
Related Party Transaction [Line Items]      
Commercial finance receivables, net due from dealers consolidated by GM(a) 122   163
Commercial loan funding payable 41   26
Taxes payable 194   $ 282
Interest subvention earned 10 9  
Affiliated Entity | Retail Finance Receivables      
Related Party Transaction [Line Items]      
Interest subvention earned 210 179  
GM      
Related Party Transaction [Line Items]      
Revenue from related parties $ 439 $ 1,000