v3.26.1
Loans and Related Allowance for Credit Losses, Allowance for Credit Losses for Loans Activity by Portfolio Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses, beginning of period $ 14,337 $ 14,636 $ 14,636
Provision for credit losses 1,139 925  
Loan charge-offs, total (1,462) (1,277)  
Loan recoveries, total 362 268  
Net loan charge-offs (1,100) (1,009)  
Other (2) 0  
Allowance for credit losses, end of period 14,374 14,552 14,337
Total Commercial [Member]      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses, beginning of period 7,457 7,946 7,946
Provision for credit losses 433 195  
Loan charge-offs, total (465) (255)  
Loan recoveries, total 105 44  
Net loan charge-offs (360) (211)  
Other (1) 0  
Allowance for credit losses, end of period 7,529 7,930 7,457
Total Consumer [Member]      
Financing Receivable, Excluding Accrued Interest, Allowance for Credit Loss [Roll Forward]      
Allowance for credit losses, beginning of period 6,880 6,690 6,690
Provision for credit losses 706 730  
Loan charge-offs, loans (997) (1,022)  
Loan recoveries, loans 257 224  
Net loan charge-offs (740) (798)  
Other (1) 0  
Allowance for credit losses, end of period $ 6,845 $ 6,622 $ 6,880