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Investment Securities - Amortized Cost and Estimated Fair Value of Securities by Contractual Maturity (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Due within one year $ 1  
Due from one to five years 1,288  
Due from five to ten years 1,527  
Due after ten years 12,007  
Fair Value 14,823 $ 10,402
Mortgage- Related Securities    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 1  
Due from one to five years 123  
Due from five to ten years 240  
Due after ten years 11,748  
Fair Value 12,112 8,573
U.S. Government and GSE Obligations    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 0  
Due from one to five years 1,013  
Due from five to ten years 1,262  
Due after ten years 0  
Fair Value 2,275  
Corporate and Other Bonds    
Debt Securities, Available-for-sale [Line Items]    
Due within one year 0  
Due from one to five years 152  
Due from five to ten years 25  
Due after ten years 37  
Fair Value 214  
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 222  
Fair Value $ 222 $ 236