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Operating Segments - Segment Reporting (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Segment Reporting [Line Items]          
Net Interest Income $ 3,621 $ 3,587 $ 7,220 $ 7,094  
Allocated provision for credit losses 395 488 874 946  
Noninterest income 1,644 1,400 3,197 2,792  
Personnel expense 1,792 1,678 3,519 3,282  
Amortization of intangibles 63 73 127 148  
Total noninterest expense 3,055 2,986 6,038 5,892  
Income (loss) before income taxes from continuing operations 1,815 1,513 3,505 3,048  
Provision (benefit) for income taxes 262 273 471 547  
Identifiable assets (period end) of continuing operations 556,023   556,023   $ 547,538
CSBB          
Segment Reporting [Line Items]          
Net Interest Income 1,624 1,496 3,229 2,931  
WB          
Segment Reporting [Line Items]          
Net Interest Income 1,942 1,872 3,864 3,756  
OT&C          
Segment Reporting [Line Items]          
Net Interest Income 55 219 127 407  
Intersegment Eliminations          
Segment Reporting [Line Items]          
Net Interest Income 0 0 0 0  
Intersegment Eliminations | CSBB          
Segment Reporting [Line Items]          
Net Interest Income 980 828 1,869 1,640  
Intersegment Eliminations | WB          
Segment Reporting [Line Items]          
Net Interest Income (411) (306) (825) (690)  
Intersegment Eliminations | OT&C          
Segment Reporting [Line Items]          
Net Interest Income (569) (522) (1,044) (950)  
Operating Segments          
Segment Reporting [Line Items]          
Net Interest Income 3,621 3,587 7,220 7,094  
Allocated provision for credit losses 395 488 874 946  
Noninterest income 1,644 1,400 3,197 2,792  
Personnel expense 1,792 1,678 3,519 3,282  
Amortization of intangibles 63 73 127 148  
Other direct noninterest expense 1,200 1,235 2,392 2,462  
Total direct noninterest expense 3,055 2,986 6,038 5,892  
Expense Allocations 0 0 0 0  
Total noninterest expense 3,055 2,986 6,038 5,892  
Income (loss) before income taxes from continuing operations 1,815 1,513 3,505 3,048  
Provision (benefit) for income taxes 262 273 471 547  
Segment net income (loss) from continuing operations 1,553 1,240 3,034 2,501  
Identifiable assets (period end) of continuing operations 556,023 543,833 556,023 543,833  
Operating Segments | CSBB          
Segment Reporting [Line Items]          
Net Interest Income 2,604 2,324 5,098 4,571  
Allocated provision for credit losses 307 384 681 711  
Noninterest income 530 519 1,058 1,022  
Personnel expense 443 434 876 868  
Amortization of intangibles 33 39 67 78  
Other direct noninterest expense 312 286 605 574  
Total direct noninterest expense 788 759 1,548 1,520  
Expense Allocations 933 940 1,853 1,843  
Total noninterest expense 1,721 1,699 3,401 3,363  
Income (loss) before income taxes from continuing operations 1,106 760 2,074 1,519  
Provision (benefit) for income taxes 271 186 509 371  
Segment net income (loss) from continuing operations 835 574 1,565 1,148  
Identifiable assets (period end) of continuing operations 153,353 152,377 153,353 152,377  
Operating Segments | WB          
Segment Reporting [Line Items]          
Net Interest Income 1,531 1,566 3,039 3,066  
Allocated provision for credit losses 90 104 195 236  
Noninterest income 1,158 941 2,227 1,888  
Personnel expense 626 574 1,238 1,131  
Amortization of intangibles 30 34 60 70  
Other direct noninterest expense 200 202 387 395  
Total direct noninterest expense 856 810 1,685 1,596  
Expense Allocations 528 519 1,048 1,036  
Total noninterest expense 1,384 1,329 2,733 2,632  
Income (loss) before income taxes from continuing operations 1,215 1,074 2,338 2,086  
Provision (benefit) for income taxes 255 213 487 413  
Segment net income (loss) from continuing operations 960 861 1,851 1,673  
Identifiable assets (period end) of continuing operations 227,667 214,764 227,667 214,764  
Operating Segments | OT&C          
Segment Reporting [Line Items]          
Net Interest Income (514) (303) (917) (543)  
Allocated provision for credit losses (2) 0 (2) (1)  
Noninterest income (44) (60) (88) (118)  
Personnel expense 723 670 1,405 1,283  
Amortization of intangibles 0 0 0 0  
Other direct noninterest expense 688 747 1,400 1,493  
Total direct noninterest expense 1,411 1,417 2,805 2,776  
Expense Allocations (1,461) (1,459) (2,901) (2,879)  
Total noninterest expense (50) (42) (96) (103)  
Income (loss) before income taxes from continuing operations (506) (321) (907) (557)  
Provision (benefit) for income taxes (264) (126) (525) (237)  
Segment net income (loss) from continuing operations (242) (195) (382) (320)  
Identifiable assets (period end) of continuing operations $ 175,003 $ 176,692 $ 175,003 $ 176,692