v3.26.3
Loans and ACL - Allowance for Credit Losses (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance     $ 5,030  
Provision (Benefit) $ (253) $ 436 621 $ 1,382
Ending balance 4,063   4,063  
Commercial: | Commercial and industrial        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1,440 1,309 1,326 1,284
Charge-Offs (125) (98) (404) (320)
Recoveries 19 20 57 75
Provision (Benefit) 129 105 484 301
Other (1) 0 (1) (4)
Ending balance 1,462 1,336 1,462 1,336
Commercial: | CRE        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 422 563 476 643
Charge-Offs 0 (25) (8) (133)
Recoveries 0 2 4 12
Provision (Benefit) (86) (35) (136) (17)
Other 0 0 0 0
Ending balance 336 505 336 505
Commercial: | Commercial construction        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 151 259 246 257
Charge-Offs (2) 0 (20) 0
Recoveries 0 0 2 1
Provision (Benefit) (37) 1 (116) 2
Other 0 0 0 0
Ending balance 112 260 112 260
Consumer: | Residential mortgage        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 173 220 198 204
Charge-Offs (1) (1) (3) (3)
Recoveries 1 2 4 4
Provision (Benefit) (11) 0 (37) 16
Other 0 0 0 0
Ending balance 162 221 162 221
Consumer: | Home equity        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 76 92 84 89
Charge-Offs (3) (2) (9) (8)
Recoveries 4 5 10 13
Provision (Benefit) (5) (6) (13) (5)
Other 0 0 0 0
Ending balance 72 89 72 89
Consumer: | Indirect auto        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1,034 990 1,036 955
Charge-Offs (358) (150) (651) (431)
Recoveries 22 25 76 78
Provision (Benefit) (509) 155 (272) 418
Other 0 0 0 0
Ending balance 189 1,020 189 1,020
Consumer: | Other consumer        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1,283 1,051 1,238 994
Charge-Offs (170) (155) (522) (455)
Recoveries 35 31 103 92
Provision (Benefit) 198 204 527 500
Other 0 1 0 1
Ending balance 1,346 1,132 1,346 1,132
Credit card        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 404 415 426 431
Charge-Offs (62) (49) (203) (193)
Recoveries 11 10 30 33
Provision (Benefit) 31 49 131 154
Other 0 0 0 0
Ending balance 384 425 384 425
ALLL        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 4,983 4,899 5,030 4,857
Charge-Offs (721) (480) (1,820) (1,543)
Recoveries 92 95 286 308
Provision (Benefit) (290) 473 568 1,369
Other (1) 1 (1) (3)
Ending balance 4,063 4,988 4,063 4,988
RUFC        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 333 354 317 304
Charge-Offs 0 0 0 0
Recoveries 0 0 0 0
Provision (Benefit) 37 (37) 53 13
Other 0 0 0 0
Ending balance 370 317 370 317
ACL        
Financing Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 5,316 5,253 5,347 5,161
Charge-Offs (721) (480) (1,820) (1,543)
Recoveries 92 95 286 308
Provision (Benefit) (253) 436 621 1,382
Other (1) 1 (1) (3)
Ending balance $ 4,433 $ 5,305 $ 4,433 $ 5,305