v3.25.4
Borrowed Funds - Schedule of Junior Subordinated Debentures (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Debt Instrument    
Capital Securities Amount Outstanding $ 590  
Flagstar Bancorp    
Debt Instrument    
Fair value adjustment (25)  
As Initially Reported    
Debt Instrument    
Junior Subordinated Debentures Amount Outstanding $ 610 $ 610
New York Community Capital Trust V (BONUSES Units)    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 6.00%  
Junior Subordinated Debentures Amount Outstanding $ 148  
Capital Securities Amount Outstanding $ 142  
New York Community Capital Trust X    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 5.58%  
Junior Subordinated Debentures Amount Outstanding $ 124  
Capital Securities Amount Outstanding $ 120  
PennFed Capital Trust III    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 7.23%  
Junior Subordinated Debentures Amount Outstanding $ 31  
Capital Securities Amount Outstanding $ 30  
New York Community Capital Trust XI    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 5.60%  
Junior Subordinated Debentures Amount Outstanding $ 59  
Capital Securities Amount Outstanding $ 58  
Flagstar Statutory Trust II    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 7.20%  
Junior Subordinated Debentures Amount Outstanding $ 26  
Capital Securities Amount Outstanding $ 25  
Flagstar Statutory Trust III    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 7.42%  
Junior Subordinated Debentures Amount Outstanding $ 26  
Capital Securities Amount Outstanding $ 25  
Flagstar Statutory Trust IV    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 7.20%  
Junior Subordinated Debentures Amount Outstanding $ 26  
Capital Securities Amount Outstanding $ 25  
Flagstar Statutory Trust V    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 6.17%  
Junior Subordinated Debentures Amount Outstanding $ 26  
Capital Securities Amount Outstanding $ 25  
Flagstar Statutory Trust VI    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 6.17%  
Junior Subordinated Debentures Amount Outstanding $ 26  
Capital Securities Amount Outstanding $ 25  
Flagstar Statutory Trust VII    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 5.73%  
Junior Subordinated Debentures Amount Outstanding $ 51  
Capital Securities Amount Outstanding $ 50  
Flagstar Statutory Trust VIII    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 5.67%  
Junior Subordinated Debentures Amount Outstanding $ 26  
Capital Securities Amount Outstanding $ 25  
Flagstar Statutory Trust IX    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 5.43%  
Junior Subordinated Debentures Amount Outstanding $ 26  
Capital Securities Amount Outstanding $ 25  
Flagstar Statutory Trust X    
Debt Instrument    
Interest Rate of Capital Securities and Debentures 6.48%  
Junior Subordinated Debentures Amount Outstanding $ 15  
Capital Securities Amount Outstanding $ 15