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Business Combination - Loans Identified as PCI Loans at Acquisition (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Feb. 01, 2026
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Business Combination [Line Items]          
Adjustment on PCD loans and leases at acquisition       $ 179  
Net charge-offs taken at time of acquisition   $ 135 $ 139 279 $ 276
Initial ALLL on other acquired loans and leases $ 8        
Comerica Incorporated          
Business Combination [Line Items]          
Fair value of acquired loans and leases, PCD 3,183        
Adjustment on PCD loans and leases at acquisition 179        
Initial amortized cost basis of acquired loans and leases, PCD 3,362        
Unpaid principal balance of acquired loans and leases, PCD 3,457        
Noncredit discount, net, PCD 95        
Fair value of acquired loans and leases, PSL 46,279        
Adjustments for expected credit losses, PSL 482        
Initial amortized cost basis of acquired loans and leases, PSL 46,761        
Unpaid principal balance of acquired loans and leases, PSL 46,836        
Noncredit discount, net, PSL (75)        
Fair value of acquired loans and leases, Other 405        
Adjustment for expected credit losses, Other 0        
Unpaid principal balance of acquired loans and leases, Other 406        
Noncredit discount, net, Other (1)        
Fair value of acquired loans and leases, Total 49,867        
Adjustments for expected credit losses, Total 661        
Initial amortized cost basis of acquired loans and leases, Total 50,528        
Unpaid principal balance of acquired loans and leases, Total 50,699        
Noncredit discount, net, Total $ (171)        
Net charge-offs taken at time of acquisition       $ 111