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Goodwill and Other Intangible Assets - Components (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2025
May 18, 2025
Dec. 31, 2024
Goodwill        
Carrying Amount of Assets $ 28,335 $ 28,335   $ 15,059
Net Carrying Amount 28,335 28,335   15,059
Other intangible assets (definite lived):        
Other intangible assets (definite lived): 13,330 13,330   495
Other intangible assets (indefinite lived): 5,378 5,378   8
Carrying Amount of Assets 18,708 18,708   503
Accumulated Amortization (551) (551)   (270)
Other intangible assets (definite lived): 12,779 12,779   225
Net Carrying Amount 18,157 18,157   233
Total goodwill and other intangible assets        
Carrying Amount of Assets 47,043 47,043   15,562
Net Carrying Amount 46,492 46,492   15,292
Commercial MSRs        
Carrying Amount of Assets 649 649   653
Accumulated Amortization (326) (326)   (309)
Net Carrying Amount 323 323   344
Amortization of Intangibles 271 287    
Discover Network        
Other intangible assets (definite lived):        
Other intangible assets (indefinite lived): 3,100 3,100    
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     $ 13,242  
Commercial MSRs        
Finite-lived intangible assets, fair value disclosure     12,840  
Purchased credit card relationships        
Other intangible assets (definite lived):        
Other intangible assets (definite lived): 10,669 10,669   369
Accumulated Amortization (408) (408)   (164)
Other intangible assets (definite lived): 10,261 10,261   205
Purchased credit card relationships | Discover        
Commercial MSRs        
Finite-lived intangible assets, fair value disclosure     10,300  
Network and financial partner relationships        
Other intangible assets (definite lived):        
Other intangible assets (definite lived): 1,500 1,500    
Accumulated Amortization (16) (16)    
Other intangible assets (definite lived): 1,484 1,484    
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 (24) (24)    
Other intangible assets (definite lived): 1,016 1,016    
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 (103) (103)   (106)
Other intangible assets (definite lived): $ 18 $ 18   $ 20