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Business Combinations and Discontinued Operations - Schedule of Finite-Lived Intangible Assets (Details) - Discover
$ in Millions
May 18, 2025
USD ($)
Business Combination [Line Items]  
Intangible assets with definite lives $ 12,840
Intangible assets with indefinite lives 5,370
Total $ 18,210
Acquired finite-lived intangible assets, weighted average useful life 11 years
Discover Network  
Business Combination [Line Items]  
Intangible assets with indefinite lives $ 3,100
Brand/Trade names  
Business Combination [Line Items]  
Intangible assets with indefinite lives $ 2,270
Purchased credit card relationships  
Business Combination [Line Items]  
Useful Life 11 months
Intangible assets with definite lives $ 10,300
Network and financial partner relationships  
Business Combination [Line Items]  
Useful Life 11 months
Intangible assets with definite lives $ 1,500
Core deposit  
Business Combination [Line Items]  
Useful Life 10 months
Intangible assets with definite lives $ 1,040