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Business Combinations and Discontinued Operations - Schedule of Operating Income (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
May 18, 2025
Business Combination [Line Items]          
Net interest income (loss) $ 9,995 $ 7,546 $ 18,008 $ 15,034  
Total non-interest income 2,497 1,960 4,484 3,874  
Income (loss) from continuing operations, net of tax (4,263) 597 (2,859) 1,877  
Discover          
Business Combination [Line Items]          
Net interest income (loss) 12,044 11,017 23,755 21,843  
Total non-interest income 2,848 2,802 5,442 5,263  
Income (loss) from continuing operations, net of tax 2,816 $ 1,532 4,987 $ (2,518)  
Business combination, pro forma net interest income $ 256   $ 520    
Business combination, allowance for credit losses PCD loan         $ 8,800