v3.25.4
GOODWILL AND INTANGIBLE ASSETS - Changes in Goodwill by Segment (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Sep. 30, 2025
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Goodwill        
Balance of goodwill at beginning of period   $ 19,300 $ 20,098 $ 19,691
Foreign exchange translation   524 (782) 407
Divestitures     (16)  
Impairment of goodwill   (726) 0 0
Balance of goodwill at end of period   19,098 19,300 20,098
Mexico Consumer, Small Business and Middle Market Banking Businesses        
Goodwill        
Impairment of goodwill $ (726)      
Goodwill impairment, after-tax $ 714      
All Other        
Goodwill        
Balance of goodwill at beginning of period   902 1,108 964
Foreign exchange translation   125 (206) 144
Divestitures     0  
Impairment of goodwill   (726)    
Balance of goodwill at end of period   301 902 1,108
Services | Operating Segments        
Goodwill        
Balance of goodwill at beginning of period   2,052 2,214 2,167
Foreign exchange translation   89 (162) 47
Divestitures     0  
Impairment of goodwill   0    
Balance of goodwill at end of period   2,141 2,052 2,214
Markets        
Goodwill        
Goodwill transferred to (from)       537
Markets | Operating Segments        
Goodwill        
Balance of goodwill at beginning of period   5,674 5,870 5,785
Foreign exchange translation   159 (196) 85
Divestitures     0  
Impairment of goodwill   0    
Balance of goodwill at end of period   5,833 5,674 5,870
Banking        
Goodwill        
Goodwill transferred to (from)       (537)
Banking | Operating Segments        
Goodwill        
Balance of goodwill at beginning of period   1,002 1,039 1,034
Foreign exchange translation   26 (37) 5
Divestitures     0  
Impairment of goodwill   0    
Balance of goodwill at end of period   1,028 1,002 1,039
USPB | Operating Segments        
Goodwill        
Balance of goodwill at beginning of period   5,219 5,398 5,273
Foreign exchange translation   123 (179) 125
Divestitures     0  
Impairment of goodwill   0    
Balance of goodwill at end of period   5,342 5,219 5,398
Wealth | Operating Segments        
Goodwill        
Balance of goodwill at beginning of period   4,451 4,469 4,468
Foreign exchange translation   2 (2) 1
Divestitures     (16)  
Impairment of goodwill   0    
Balance of goodwill at end of period   $ 4,453 $ 4,451 $ 4,469