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Loans - Summary of Consumer Loans by Refreshed FICO Credit Score (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]    
Carrying Value $ 226,887 $ 200,866
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100 100
Credit cards    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Value $ 20,017 $ 21,403
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100 100
Credit cards | FICO    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Value $ 20,017 $ 19,615
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 100 100
Greater than or equal to 660 | Credit cards | FICO    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Value $ 13,251 $ 13,090
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 66 67
Less than 660 | Credit cards | FICO    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Value $ 6,766 $ 6,525
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score 34 33