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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Oct. 24, 2025
USD ($)
loanPurchaser
Sep. 30, 2025
USD ($)
facility
Sep. 30, 2025
USD ($)
segment
facility
Oct. 28, 2025
USD ($)
Apr. 29, 2025
USD ($)
Jan. 03, 2025
USD ($)
Debt Instrument [Line Items]            
Number of operating segments | segment     1      
Number of reportable segments | segment     1      
Loan Purchase Agreement | Consumer Loan | Subsequent Event            
Debt Instrument [Line Items]            
Number of third party loan purchasers | loanPurchaser 2          
Loan Purchase Agreement | Consumer Loan | Subsequent Event | Purchase Finance Receivables through October 2027            
Debt Instrument [Line Items]            
Transfer of financial assets accounted for as sales, new total eligible amount to be sold $ 4,000          
Loan Purchase Agreement | Consumer Loan | Subsequent Event | Purchase Finance Receivables through December 2027            
Debt Instrument [Line Items]            
Transfer of financial assets accounted for as sales, new total eligible amount to be sold $ 4,000          
MPSA | Consumer Loan            
Debt Instrument [Line Items]            
Transfer of financial assets accounted for as sales, new total eligible amount to be sold         $ 4,000 $ 4,000
MPSA | Consumer Loan | Subsequent Event | Ally Parties            
Debt Instrument [Line Items]            
Transfer of financial assets accounted for as sales, new total eligible amount to be sold       $ 6,000    
Revolving Credit Facility | Line of Credit            
Debt Instrument [Line Items]            
Number of instruments extended and upsized | facility   2 2      
Line of credit facility, maximum borrowing capacity (up to)   $ 600 $ 600      
2028 Senior Secured Notes | Senior Notes            
Debt Instrument [Line Items]            
Debt instrument, redeemed during period   $ 559