v3.26.3
Operating Segments - Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Net Interest Income $ 3,663 $ 3,629 $ 10,883 $ 10,723  
Allocated provision (benefit) for credit losses (253) 436 621 1,382  
Noninterest income 84 1,558 3,281 4,350  
Personnel expense 1,853 1,748 5,372 5,030  
Amortization of intangibles 62 72 189 220  
Total noninterest expense 3,105 3,014 9,143 8,906  
Income (loss) before income taxes from continuing operations 895 1,737 4,400 4,785  
Provision (benefit) for income taxes 96 285 567 832  
Identifiable assets (period end) of continuing operations 554,196   554,196   $ 547,538
CSBB          
Segment Reporting [Line Items]          
Net Interest Income 1,670 1,571 4,901 4,502  
WB          
Segment Reporting [Line Items]          
Net Interest Income 1,878 2,029 5,740 5,784  
OT&C          
Segment Reporting [Line Items]          
Net Interest Income 115 29 242 437  
Intersegment Eliminations          
Segment Reporting [Line Items]          
Net Interest Income 0 0 0 0  
Intersegment Eliminations | CSBB          
Segment Reporting [Line Items]          
Net Interest Income 1,047 850 2,912 2,488  
Intersegment Eliminations | WB          
Segment Reporting [Line Items]          
Net Interest Income (317) (451) (1,137) (1,139)  
Intersegment Eliminations | OT&C          
Segment Reporting [Line Items]          
Net Interest Income (730) (399) (1,775) (1,349)  
Operating Segments          
Segment Reporting [Line Items]          
Net Interest Income 3,663 3,629 10,883 10,723  
Allocated provision (benefit) for credit losses (253) 436 621 1,382  
Noninterest income 84 1,558 3,281 4,350  
Personnel expense 1,853 1,748 5,372 5,030  
Amortization of intangibles 62 72 189 220  
Other direct noninterest expense 1,190 1,194 3,582 3,656  
Total direct noninterest expense 3,105 3,014 9,143 8,906  
Expense allocations 0 0 0 0  
Total noninterest expense 3,105 3,014 9,143 8,906  
Income (loss) before income taxes from continuing operations 895 1,737 4,400 4,785  
Provision (benefit) for income taxes 96 285 567 832  
Segment net income (loss) from continuing operations 799 1,452 3,833 3,953  
Identifiable assets (period end) of continuing operations 554,196 543,851 554,196 543,851  
Operating Segments | CSBB          
Segment Reporting [Line Items]          
Net Interest Income 2,717 2,421 7,813 6,990  
Allocated provision (benefit) for credit losses (299) 400 382 1,111  
Noninterest income 468 530 1,526 1,552  
Personnel expense 459 449 1,335 1,317  
Amortization of intangibles 33 38 100 115  
Other direct noninterest expense 319 281 924 854  
Total direct noninterest expense 811 768 2,359 2,286  
Expense allocations 988 942 2,841 2,803  
Total noninterest expense 1,799 1,710 5,200 5,089  
Income (loss) before income taxes from continuing operations 1,685 841 3,757 2,342  
Provision (benefit) for income taxes 409 205 918 571  
Segment net income (loss) from continuing operations 1,276 636 2,839 1,771  
Identifiable assets (period end) of continuing operations 147,510 153,895 147,510 153,895  
Operating Segments | WB          
Segment Reporting [Line Items]          
Net Interest Income 1,561 1,578 4,603 4,645  
Allocated provision (benefit) for credit losses 47 36 242 272  
Noninterest income 1,215 1,142 3,443 3,030  
Personnel expense 632 598 1,870 1,729  
Amortization of intangibles 29 34 89 105  
Other direct noninterest expense 185 199 572 594  
Total direct noninterest expense 846 831 2,531 2,428  
Expense allocations 551 487 1,600 1,525  
Total noninterest expense 1,397 1,318 4,131 3,953  
Income (loss) before income taxes from continuing operations 1,332 1,366 3,673 3,450  
Provision (benefit) for income taxes 284 283 772 696  
Segment net income (loss) from continuing operations 1,048 1,083 2,901 2,754  
Identifiable assets (period end) of continuing operations 227,929 219,108 227,929 219,108  
Operating Segments | OT&C          
Segment Reporting [Line Items]          
Net Interest Income (615) (370) (1,533) (912)  
Allocated provision (benefit) for credit losses (1) 0 (3) (1)  
Noninterest income (1,599) (114) (1,688) (232)  
Personnel expense 762 701 2,167 1,984  
Amortization of intangibles 0 0 0 0  
Other direct noninterest expense 686 714 2,086 2,208  
Total direct noninterest expense 1,448 1,415 4,253 4,192  
Expense allocations (1,539) (1,429) (4,441) (4,328)  
Total noninterest expense (91) (14) (188) (136)  
Income (loss) before income taxes from continuing operations (2,122) (470) (3,030) (1,007)  
Provision (benefit) for income taxes (597) (203) (1,123) (435)  
Segment net income (loss) from continuing operations (1,525) (267) (1,907) (572)  
Identifiable assets (period end) of continuing operations $ 178,757 $ 170,848 $ 178,757 $ 170,848