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Allowance for Credit Losses (Allowance for Credit Losses Methodology) (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended 12 Months Ended 36 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
Dec. 31, 2024
Allowance for credit losses on loans and leases            
Balance, beginning of period $ 421 $ 419 $ 425 $ 441 $ 441  
PCD ACL at acquisition 5   5      
Provision (recapture) for credit losses on loans and leases 69 31 124 83    
Charge-offs (27) (35) (96) (121)    
Recoveries 5 5 15 17    
Net charge-offs (22) (30) (81) (104)    
Balance, end of period 473 420 473 420 425 $ 425
Reserve for unfunded commitments            
Balance, beginning of period 18 20 16 23 23  
Recapture for credit losses on unfunded commitments 1 (2) 3 (5)    
Balance, end of period 19 18 19 18 16 16
Total allowance for credit losses 492 438 492 438 441 441
Commercial real estate            
Allowance for credit losses on loans and leases            
Balance, beginning of period 160 143 154 126 126  
PCD ACL at acquisition 4   4      
Provision (recapture) for credit losses on loans and leases 44 15 50 32    
Charge-offs (3) 0 (3) (1)    
Recoveries 0 0 0 1    
Net charge-offs (3) 0 (3) 0    
Balance, end of period 205 158 205 158 154 154
Reserve for unfunded commitments            
Balance, beginning of period 8 10 6 11 11  
Recapture for credit losses on unfunded commitments 2 (2) 4 (3)    
Balance, end of period 10 8 10 8 6 6
Total allowance for credit losses 215 166 215 166    
Commercial            
Allowance for credit losses on loans and leases            
Balance, beginning of period 220 220 219 245 245  
PCD ACL at acquisition 1   1      
Provision (recapture) for credit losses on loans and leases 22 17 80 63    
Charge-offs (22) (33) (88) (113)    
Recoveries 4 5 13 14    
Net charge-offs (18) (28) (75) (99)    
Balance, end of period 225 209 225 209 219 219
Reserve for unfunded commitments            
Balance, beginning of period 8 7 7 8 8  
Recapture for credit losses on unfunded commitments (1) 0 0 (1)    
Balance, end of period 7 7 7 7 7 7
Total allowance for credit losses 232 216 232 216    
Residential            
Allowance for credit losses on loans and leases            
Balance, beginning of period 34 49 45 62 62  
PCD ACL at acquisition 0   0      
Provision (recapture) for credit losses on loans and leases 2 (2) (8) (15)    
Charge-offs 0 (1) (1) (2)    
Recoveries 0 0 0 1    
Net charge-offs 0 (1) (1) (1)    
Balance, end of period 36 46 36 46 45 45
Reserve for unfunded commitments            
Balance, beginning of period 1 2 2 3 3  
Recapture for credit losses on unfunded commitments 0 0 (1) (1)    
Balance, end of period 1 2 1 2 2 2
Total allowance for credit losses 37 48 37 48    
Consumer & other            
Allowance for credit losses on loans and leases            
Balance, beginning of period 7 7 7 8 8  
PCD ACL at acquisition 0   0      
Provision (recapture) for credit losses on loans and leases 1 1 2 3    
Charge-offs (2) (1) (4) (5)   (6)
Recoveries 1 0 2 1    
Net charge-offs (1) (1) (2) (4)    
Balance, end of period 7 7 7 7 7 7
Reserve for unfunded commitments            
Balance, beginning of period 1 1 1 1 1  
Recapture for credit losses on unfunded commitments 0 0 0 0    
Balance, end of period 1 1 1 1 $ 1 $ 1
Total allowance for credit losses $ 8 $ 8 $ 8 $ 8