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Business Combinations and Discontinued Operations - Schedule of Operating Income (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Jun. 30, 2025
May 18, 2025
Business Combination [Line Items]          
Net interest income (loss) $ 42,878 $ 31,208 $ 29,241    
Non-interest income (loss) 10,556 7,904 7,546    
Income (loss) from continuing operations, net of tax 2,088 4,747 $ 4,887    
Discover          
Business Combination [Line Items]          
Net interest income (loss) 48,908,000 45,475,000      
Non-interest income (loss) 11,515,000 10,946,000      
Income (loss) from continuing operations, net of tax 10,243,000 1,688,000      
Business combination, pro forma net interest income   $ 800      
Business combination, allowance for credit losses PCD loan $ 8,800     $ 8,800 $ 8,800