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Finance Receivable Sale Agreements - Narrative (Details)
12 Months Ended
May 07, 2019
USD ($)
Dec. 31, 2022
USD ($)
agreementType
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Jan. 31, 2023
USD ($)
Jan. 13, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 22, 2022
USD ($)
Mar. 31, 2021
USD ($)
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Number of agreement types | agreementType   2                
Subsequent Event                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Line of credit facility, maximum borrowing capacity (up to)           $ 300,000,000        
Amended and Restated Loan and Security Agreement | Revolving Credit Facility | Ally Bank | Line of Credit                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Line of credit facility, maximum borrowing capacity (up to) $ 350,000,000                  
Consumer Loan                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Payments to repurchase financing receivables 34,000,000                  
Payments for purchase of finance receivables         $ 128,000,000          
Consumer Loan | Debt And Other Liabilities                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Payments to repurchase financing receivables 106,000,000                  
Consumer Loan | Financing Receivable                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Payments to repurchase financing receivables $ 140,000,000                  
Consumer Loan | MPSA                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Commitment of purchaser, current availability financing, principal balances of finance receivables (up to)               $ 5,000,000,000 $ 5,000,000,000 $ 4,000,000,000
Principal balances of finance receivables through securitization transactions, sold   $ 3,800,000,000 $ 2,100,000,000 $ 2,200,000,000            
Consumer Loan | MPSA | Subsequent Event                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Commitment of purchaser, current availability financing, principal balances of finance receivables (up to)             $ 4,000,000,000      
Consumer Loan | Master Purchase and Sale Agreement and Master Transfer Agreements                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Gain on loan sales   411,000,000 718,000,000 218,000,000            
Consumer Loan | 2017 Master Transfer Agreement                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Principal balances of finance receivables through securitization transactions, sold         $ 139,000,000          
Securitization Transaction                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Principal balances of finance receivables through securitization transactions, sold   $ 2,400,000,000 5,000,000,000 900,000,000            
Fixed Pool Loan                    
Securitization or Asset-backed Financing Arrangement, Financial Asset for which Transfer is Accounted as Sale [Line Items]                    
Principal balances of finance receivables through securitization transactions, sold     $ 0 $ 320,000,000