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Goodwill and Other Intangible Assets - Components (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
May 18, 2025
Dec. 31, 2023
Dec. 31, 2022
Goodwill          
Carrying Amount of Assets $ 28,509 $ 15,059      
Net Carrying Amount 28,509 15,059   $ 15,065 $ 14,777
Other intangible assets (definite lived):          
Other intangible assets (definite lived): 13,190 495      
Other intangible assets (indefinite lived): 4,978 8      
Carrying Amount of Assets 18,168 503      
Accumulated Amortization (1,590) (270)      
Other intangible assets (definite lived): 11,600 225      
Net Carrying Amount 16,578 233      
Total goodwill and other intangible assets          
Carrying Amount of Assets 46,677 15,562      
Net Carrying Amount 45,087 15,292      
Commercial MSRs          
Carrying Amount of Assets 646 653      
Accumulated Amortization (343) (309)      
Net Carrying Amount $ 303 $ 344      
Weighted Average Remaining Amortization Period 10 years 3 months 18 days 6 years      
Servicing asset at amortized cost, amortization $ 80 $ 77      
Discover Network          
Other intangible assets (definite lived):          
Other intangible assets (indefinite lived): 2,700        
Brand/Trade names          
Other intangible assets (definite lived):          
Other intangible assets (indefinite lived): 2,270        
Other          
Other intangible assets (definite lived):          
Other intangible assets (indefinite lived): 8 8      
Discover          
Goodwill          
Net Carrying Amount 13,400   $ 13,424    
Commercial MSRs          
Finite-lived intangible assets, fair value disclosure     $ 12,700    
Purchased credit card relationships          
Other intangible assets (definite lived):          
Other intangible assets (definite lived): 10,469 369      
Accumulated Amortization (1,274) (164)      
Other intangible assets (definite lived): $ 9,195 $ 205      
Commercial MSRs          
Weighted Average Remaining Amortization Period 10 years 3 months 18 days 6 years 1 month 6 days      
Purchased credit card relationships | Discover          
Commercial MSRs          
Weighted Average Remaining Amortization Period     11 months    
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        
Accumulated Amortization (84)        
Other intangible assets (definite lived): $ 1,416        
Commercial MSRs          
Weighted Average Remaining Amortization Period 10 years 7 months 6 days        
Network and financial partner relationships | Discover          
Commercial MSRs          
Weighted Average Remaining Amortization Period     11 months    
Finite-lived intangible assets, fair value disclosure     $ 1,500    
Core deposit          
Other intangible assets (definite lived):          
Other intangible assets (definite lived): $ 1,100        
Accumulated Amortization (125)        
Other intangible assets (definite lived): $ 975        
Commercial MSRs          
Weighted Average Remaining Amortization Period 9 years 4 months 24 days        
Core deposit | Discover          
Commercial MSRs          
Weighted Average Remaining Amortization Period     10 months    
Finite-lived intangible assets, fair value disclosure     $ 1,100    
Other          
Other intangible assets (definite lived):          
Other intangible assets (definite lived): $ 121 $ 126      
Accumulated Amortization (107) (106)      
Other intangible assets (definite lived): $ 14 $ 20      
Commercial MSRs          
Weighted Average Remaining Amortization Period 4 years 9 months 18 days 5 years 1 month 6 days