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Business Combinations and Discontinued Operations - Schedule of Operating Income (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
May 18, 2025
Business Combination [Line Items]            
Net interest income (loss) $ 12,404 $ 8,076 $ 30,412 $ 23,110    
Total non-interest income (loss) 2,955 1,938 7,439 5,812    
Income (loss) from continuing operations, net of tax 3,193 1,777 334 3,654    
Discover            
Business Combination [Line Items]            
Net interest income (loss) 12,580,000 11,738,000 36,335,000 33,583,000    
Total non-interest income (loss) 2,955,000 2,564,000 8,397,000 7,827,000    
Income (loss) from continuing operations, net of tax 3,363,000 2,123,000 8,369,000 (361,000)    
Business combination, pro forma net interest income   $ 244   $ 764    
Business combination, allowance for credit losses PCD loan $ 8,800   $ 8,800   $ 8,800 $ 8,800