v3.26.1
Reserves for Credit Losses - Changes in Other Loan Reserve (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Provisions for credit losses $ 1,251 $ 1,150  
Other Loans      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Beginning reserves 323 194 $ 194
Provisions for credit losses 48 105  
Net write-offs (66)   (242)
Other 0 0  
Ending reserves 314 244 $ 323
Other Loans | Principal      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Net write-offs (54) (53)  
Recoveries 9 7  
Other Loans | Interest and fees      
Financing Receivable, Allowance for Credit Loss [Roll Forward]      
Net write-offs $ (3) $ (2)