v3.25.4
Loans - Summary of Consumer Loans by Refreshed FICO Credit Score (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Financing Receivable, Recorded Investment [Line Items]    
Carrying Value $ 239,882 $ 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 $ 19,742 $ 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   $ 19,615
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score   100
Greater than or equal to 660 | Credit cards | FICO    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Value   $ 13,090
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score   67
Less than 660 | Credit cards | FICO    
Financing Receivable, Recorded Investment [Line Items]    
Carrying Value   $ 6,525
Percentage concentration of gross installment and credit card loans by refreshed FICO credit score   33