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Borrowed Funds - Narrative (Details) - USD ($)
 12 Months Ended
Nov. 04, 2007
Nov. 04, 2002
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Debt Instrument          
Interest payable     $ 50,000,000 $ 37,000,000  
Long-term debt     $ 21,267,000,000 $ 21,332,000,000  
FHLB advances, weighted average interest rate     508.00% 348.00%  
FHLB advances, average amount overnight     $ 624,000,000 $ 318,000,000  
FHLB interest expense     564,000,000 251,000,000 $ 233,000,000
Repurchase agreements, interest expense     0 14,000,000 18,000,000
Federal funds purchased, average balance     $ 196,000,000 $ 466,000,000  
Federal funds purchased, weighted average interest rate     501.00% 165.00%  
Federal funds purchased, interest expense     $ 10,000,000 $ 8,000,000 0
Junior subordinated debentures     579,000,000 575,000,000  
Offering price (in dollars per share)   $ 20.04      
Number of securities called by each warrant (in shares)   2.4953      
Number of securities called by warrant (in shares)   14,000,000      
Warrant term   49 years      
Liquidation amount (in dollars per share)   $ 50.00      
Noncallable term 5 years 5 years      
Settlement terms, fair value of shares amount     $ 182,600,000    
Settlement terms, period     49 years    
Unamortized discount     $ 64,000,000    
Deferrable term     5 years    
Junior subordinated debenture, interest expense     $ 48,000,000 22,000,000 $ 18,000,000
Subordinated notes     $ 438,000,000 432,000,000  
FHLB lock out term     5 years    
Warrant Or Right, Coupon Rate   600.00%      
New York Community Capital Trust V (BONUSES Units)          
Debt Instrument          
Junior subordinated debentures     $ 147,000,000    
Unamortized discount     92,400,000    
Additional Paid-in Capital [Member]          
Debt Instrument          
Adjustments to warrants issued     92,400,000    
BONUSES Units          
Debt Instrument          
Offering price (in dollars per share)   $ 50.00      
Warrant outstanding (in shares)   5,500,000      
Warrants proceeds amount     275,000,000    
Total wholesale borrowings          
Debt Instrument          
Unused lines of credit available     8,400,000,000 11,300,000,000  
Long-term debt     20,250,000,000 20,325,000,000  
FHLB advances          
Debt Instrument          
Long-term debt     19,250,000,000 20,325,000,000  
FHLB advances, overnight     0 2,800,000,000  
Previously Reported          
Debt Instrument          
Junior subordinated debentures     $ 609,000,000 $ 608,000,000