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Investment Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Due within one year $ 299  
Due from one to five years 455  
Due from five to ten years 1,565  
Due after ten years 7,017  
Amortized Cost 9,336  
Mortgage-Related Debt Securities:    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 2  
Due from one to five years 172  
Due from five to ten years 311  
Due after ten years 7,195  
Amortized Cost 7,680 $ 7,035
U.S. Government agency and GSE obligations    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 250  
Due from one to five years 0  
Due from five to ten years 1,502  
Due after ten years 0  
Amortized Cost 1,752  
US States and Political Subdivisions Debt 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 6  
Due after ten years 0  
Amortized Cost 6  
Other Debt Obligations    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 50  
Due from one to five years 304  
Due from five to ten years 102  
Due after ten years 331  
Amortized Cost $ 787