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Goodwill and Other Intangible Assets - Components (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2025
May 18, 2025
Dec. 31, 2024
Goodwill        
Carrying Amount of Assets $ 28,863 $ 28,863   $ 15,059
Net Carrying Amount 28,863 28,863   15,059
Other intangible assets (definite lived):        
Other intangible assets (definite lived): 13,130 13,130   495
Other intangible assets (indefinite lived): 4,978 4,978   8
Carrying Amount of Assets 18,108 18,108   503
Accumulated Amortization (1,066) (1,066)   (270)
Other intangible assets (definite lived): 12,064 12,064   225
Net Carrying Amount 17,042 17,042   233
Total goodwill and other intangible assets        
Carrying Amount of Assets 46,971 46,971   15,562
Net Carrying Amount 45,905 45,905   15,292
Commercial MSRs        
Carrying Amount of Assets 645 645   653
Accumulated Amortization (336) (336)   (309)
Net Carrying Amount 309 309   344
Amortization of Intangibles 514 801    
Discover Network        
Other intangible assets (definite lived):        
Other intangible assets (indefinite lived): 2,700 2,700    
Brand/Trade names        
Other intangible assets (definite lived):        
Other intangible assets (indefinite lived): 2,270 2,270    
Other        
Other intangible assets (definite lived):        
Other intangible assets (indefinite lived): 8 8   8
Discover        
Goodwill        
Net Carrying Amount     $ 13,778  
Commercial MSRs        
Finite-lived intangible assets, fair value disclosure     12,640  
Purchased credit card relationships        
Other intangible assets (definite lived):        
Other intangible assets (definite lived): 10,469 10,469   369
Accumulated Amortization (839) (839)   (164)
Other intangible assets (definite lived): 9,630 9,630   205
Purchased credit card relationships | Discover        
Commercial MSRs        
Finite-lived intangible assets, fair value disclosure     10,100  
Network and financial partner relationships        
Other intangible assets (definite lived):        
Other intangible assets (definite lived): 1,500 1,500    
Accumulated Amortization (50) (50)    
Other intangible assets (definite lived): 1,450 1,450    
Network and financial partner relationships | Discover        
Commercial MSRs        
Finite-lived intangible assets, fair value disclosure     1,500  
Core deposit        
Other intangible assets (definite lived):        
Other intangible assets (definite lived): 1,040 1,040    
Accumulated Amortization (71) (71)    
Other intangible assets (definite lived): 969 969    
Core deposit | Discover        
Commercial MSRs        
Finite-lived intangible assets, fair value disclosure     $ 1,040  
Other        
Other intangible assets (definite lived):        
Other intangible assets (definite lived): 121 121   126
Accumulated Amortization (106) (106)   (106)
Other intangible assets (definite lived): $ 15 $ 15   $ 20