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Borrowed Funds - Junior Subordinated Debentures (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Debt Instrument
Junior subordinated debentures	$ 609	$ 609
Capital Securities Amount Outstanding	589
Fair value adjustments, business combination	(30)
Previously Reported
Debt Instrument
Junior subordinated debentures	$ 609
New York Community Capital Trust V (BONUSES Units)
Debt Instrument
Interest Rate of Capital Securities and Debentures	6.00%
Junior subordinated debentures	$ 147
Capital Securities Amount Outstanding	$ 141
New York Community Capital Trust X
Debt Instrument
Interest Rate of Capital Securities and Debentures	7.19%
Junior subordinated debentures	$ 124
Capital Securities Amount Outstanding	$ 120
PennFed Capital Trust III
Debt Instrument
Interest Rate of Capital Securities and Debentures	8.84%
Junior subordinated debentures	$ 31
Capital Securities Amount Outstanding	$ 30
New York Community Capital Trust XI
Debt Instrument
Interest Rate of Capital Securities and Debentures	7.21%
Junior subordinated debentures	$ 59
Capital Securities Amount Outstanding	$ 58
Flagstar Statutory Trust II
Debt Instrument
Interest Rate of Capital Securities and Debentures	8.82%
Junior subordinated debentures	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust III
Debt Instrument
Interest Rate of Capital Securities and Debentures	8.83%
Junior subordinated debentures	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust IV
Debt Instrument
Interest Rate of Capital Securities and Debentures	8.81%
Junior subordinated debentures	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust V
Debt Instrument
Interest Rate of Capital Securities and Debentures	7.58%
Junior subordinated debentures	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust VI
Debt Instrument
Interest Rate of Capital Securities and Debentures	7.58%
Junior subordinated debentures	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust VII
Debt Instrument
Interest Rate of Capital Securities and Debentures	7.34%
Junior subordinated debentures	$ 51
Capital Securities Amount Outstanding	$ 50
Flagstar Statutory Trust VIII
Debt Instrument
Interest Rate of Capital Securities and Debentures	7.08%
Junior subordinated debentures	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust IX
Debt Instrument
Interest Rate of Capital Securities and Debentures	7.04%
Junior subordinated debentures	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust X
Debt Instrument
Interest Rate of Capital Securities and Debentures	8.09%
Junior subordinated debentures	$ 15
Capital Securities Amount Outstanding	$ 15

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