Borrowed Funds - Junior Subordinated Debentures Outstanding (Details) - USD ($) $ in Millions		6 Months Ended
		Jun. 30, 2022	Dec. 31, 2021
Subordinated Borrowing [Line Items]
Junior Subordinated Debentures Amount Outstanding		$ 361	$ 361
Capital Securities Amount Outstanding		$ 348
New York Community Capital Trust V (BONUSESSM Units)
Subordinated Borrowing [Line Items]
Interest Rate of Capital Securities and Debentures	[1]	6.00%
Junior Subordinated Debentures Amount Outstanding	[1]	$ 147
Capital Securities Amount Outstanding	[1]	$ 140
Date of Original Issue	[1]	Nov. 04, 2002
Stated Maturity	[1]	Nov. 01, 2051
First Optional Redemption Date	[1]	Nov. 04, 2007
New York Community Capital Trust X
Subordinated Borrowing [Line Items]
Interest Rate of Capital Securities and Debentures	[2]	3.43%
Junior Subordinated Debentures Amount Outstanding	[2]	$ 124
Capital Securities Amount Outstanding	[2]	$ 120
Date of Original Issue	[2]	Dec. 14, 2006
Stated Maturity	[2]	Dec. 15, 2036
First Optional Redemption Date	[2]	Dec. 15, 2011
PennFed Capital Trust III
Subordinated Borrowing [Line Items]
Interest Rate of Capital Securities and Debentures	[2]	5.08%
Junior Subordinated Debentures Amount Outstanding	[2]	$ 31
Capital Securities Amount Outstanding	[2]	$ 30
Date of Original Issue	[2]	Jun. 02, 2003
Stated Maturity	[2]	Jun. 15, 2033
First Optional Redemption Date	[2]	Jun. 15, 2008
New York Community Capital Trust XI
Subordinated Borrowing [Line Items]
Interest Rate of Capital Securities and Debentures	[2]	3.90%
Junior Subordinated Debentures Amount Outstanding	[2]	$ 59
Capital Securities Amount Outstanding	[2]	$ 58
Date of Original Issue	[2]	Apr. 16, 2007
Stated Maturity	[2]	Jun. 30, 2037
First Optional Redemption Date	[2]	Jun. 30, 2012

[1] Callable subject to certain conditions as described in the prospectus filed with the SEC on November 4, 2002.

[2] Callable from this date forward.