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Borrowed Funds (Remaining Maturity) (Details) - USD ($)
$ in Millions
Sep. 30, 2025
Dec. 31, 2024
Debt Disclosure [Abstract]    
Less than 1 year $ 14,761  
1 to 2 years 11,043  
2 to 3 years 8,669  
3 to 4 years 4,982  
4 to 5 years 4,355  
Over 5 years 18,534  
Total borrowed funds $ 62,344 $ 61,673