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Subsequent Events (Details) - Consumer Loan - USD ($)
$ in Billions
Oct. 28, 2025
Oct. 24, 2025
Apr. 29, 2025
Jan. 03, 2025
MPSA        
Subsequent Event [Line Items]        
Transfer of financial assets accounted for as sales, new total eligible amount to be sold     $ 4.0 $ 4.0
Subsequent Event | Loan Purchase Agreement | Purchase Finance Receivables through October 2027        
Subsequent Event [Line Items]        
Transfer of financial assets accounted for as sales, new total eligible amount to be sold   $ 4.0    
Subsequent Event | Loan Purchase Agreement | Purchase Finance Receivables through December 2027        
Subsequent Event [Line Items]        
Transfer of financial assets accounted for as sales, new total eligible amount to be sold   $ 4.0    
Subsequent Event | MPSA | Ally Parties        
Subsequent Event [Line Items]        
Transfer of financial assets accounted for as sales, new total eligible amount to be sold $ 6.0