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Borrowed Funds - Junior Subordinated Debentures (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Debt Instrument
Junior Subordinated Notes	$ 579	$ 575
Capital Securities Amount Outstanding	589
Flagstar Bancorp
Debt Instrument
Fair value adjustment	(30)
Previously Reported
Debt Instrument
Junior Subordinated Notes	$ 609	$ 608
New York Community Capital Trust V (BONUSES Units)
Debt Instrument
Interest Rate of Capital Securities and Debentures	600.00%
Junior Subordinated Notes	$ 147
Capital Securities Amount Outstanding	$ 141
New York Community Capital Trust X
Debt Instrument
Interest Rate of Capital Securities and Debentures	725.00%
Junior Subordinated Notes	$ 124
Capital Securities Amount Outstanding	$ 120
PennFed Capital Trust III
Debt Instrument
Interest Rate of Capital Securities and Debentures	890.00%
Junior Subordinated Notes	$ 31
Capital Securities Amount Outstanding	$ 30
New York Community Capital Trust XI
Debt Instrument
Interest Rate of Capital Securities and Debentures	724.00%
Junior Subordinated Notes	$ 59
Capital Securities Amount Outstanding	$ 58
Flagstar Statutory Trust II
Debt Instrument
Interest Rate of Capital Securities and Debentures	887.00%
Junior Subordinated Notes	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust III
Debt Instrument
Interest Rate of Capital Securities and Debentures	891.00%
Junior Subordinated Notes	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust IV
Debt Instrument
Interest Rate of Capital Securities and Debentures	884.00%
Junior Subordinated Notes	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust V
Debt Instrument
Interest Rate of Capital Securities and Debentures	766.00%
Junior Subordinated Notes	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust VI
Debt Instrument
Interest Rate of Capital Securities and Debentures	766.00%
Junior Subordinated Notes	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust VII
Debt Instrument
Interest Rate of Capital Securities and Debentures	740.00%
Junior Subordinated Notes	$ 51
Capital Securities Amount Outstanding	$ 50
Flagstar Statutory Trust VIII
Debt Instrument
Interest Rate of Capital Securities and Debentures	716.00%
Junior Subordinated Notes	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust IX
Debt Instrument
Interest Rate of Capital Securities and Debentures	710.00%
Junior Subordinated Notes	$ 26
Capital Securities Amount Outstanding	$ 25
Flagstar Statutory Trust X
Debt Instrument
Interest Rate of Capital Securities and Debentures	815.00%
Junior Subordinated Notes	$ 15
Capital Securities Amount Outstanding	$ 15

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