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Investment Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Due within one year $ 80  
Due from one to five years 1,336  
Due from five to ten years 1,873  
Due after ten years 10,299  
Amortized Cost 13,588 $ 11,295
Mortgage- Related Securities    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 80  
Due from one to five years 112  
Due from five to ten years 287  
Due after ten years 10,027  
Amortized Cost 10,506 9,155
U.S. Government and GSE Obligations    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 0  
Due from one to five years 1,002  
Due from five to ten years 1,502  
Due after ten years 0  
Amortized Cost 2,504  
Corporate and Other Bonds    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 0  
Due from one to five years 222  
Due from five to ten years 84  
Due after ten years 40  
Amortized Cost 346  
Asset-Backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 0  
Due from one to five years 0  
Due from five to ten years 0  
Due after ten years 232  
Amortized Cost $ 232 $ 237