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Borrowed Funds - Contractual Terms of Junior Subordinated Debentures Outstanding (Details) - USD ($) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2022 | Dec. 31, 2021
Subordinated Borrowing [Line Items] |  |  |
Junior Subordinated Debentures Amount Outstanding |  | $ 575 | $ 361
Junior Subordinated Debentures Amount Outstanding |  | 608 | $ 361
Capital Securities Amount Outstanding |  | $ 588 |
New York Community Capital Trust V (BONUSES 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] | $ 141 |
Date of Original Issue | [1] | Nov. 04, 2002 |
Stated Maturity | [1] | Nov. 01, 2051 |
New York Community Capital Trust X |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 6.37% |
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 |
PennFed Capital Trust III |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 8.02% |
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 |
New York Community Capital Trust XI |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 6.38% |
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 |
Flagstar Statutory Trust II |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 7.97% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 26 |
Capital Securities Amount Outstanding | [2] | $ 25 |
Date of Original Issue | [2] | Dec. 26, 2002 |
Stated Maturity | [2] | Dec. 26, 2032 |
Flagstar Statutory Trust III |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 7.33% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 26 |
Capital Securities Amount Outstanding | [2] | $ 25 |
Date of Original Issue | [2] | Feb. 19, 2003 |
Stated Maturity | [2] | Apr. 07, 2033 |
Flagstar Statutory Trust IV |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 7.98% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 26 |
Capital Securities Amount Outstanding | [2] | $ 25 |
Date of Original Issue | [2] | Mar. 19, 2003 |
Stated Maturity | [2] | Mar. 19, 2033 |
Flagstar Statutory Trust V |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 6.08% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 26 |
Capital Securities Amount Outstanding | [2] | $ 25 |
Date of Original Issue | [2] | Dec. 29, 2004 |
Stated Maturity | [2] | Jan. 07, 2035 |
Flagstar Statutory Trust VI |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 6.08% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 26 |
Capital Securities Amount Outstanding | [2] | $ 25 |
Date of Original Issue | [2] | Mar. 30, 2005 |
Stated Maturity | [2] | Apr. 07, 2035 |
Flagstar Statutory Trust VII |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 6.52% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 51 |
Capital Securities Amount Outstanding | [2] | $ 50 |
Date of Original Issue | [2] | Mar. 29, 2005 |
Stated Maturity | [2] | Jun. 15, 2035 |
Flagstar Statutory Trust VIII |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 5.58% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 25 |
Capital Securities Amount Outstanding | [2] | $ 24 |
Date of Original Issue | [2] | Sep. 22, 2005 |
Stated Maturity | [2] | Oct. 07, 2035 |
Flagstar Statutory Trust IX |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 6.22% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 25 |
Capital Securities Amount Outstanding | [2] | $ 24 |
Date of Original Issue | [2] | Jun. 28, 2007 |
Stated Maturity | [2] | Sep. 15, 2037 |
Flagstar Statutory Trust X |  |  |
Subordinated Borrowing [Line Items] |  |  |
Interest Rate of Capital Securities and Debentures | [2] | 7.27% |
Junior Subordinated Debentures Amount Outstanding | [2] | $ 16 |
Capital Securities Amount Outstanding | [2] | $ 16 |
Date of Original Issue | [2] | Aug. 31, 2007 |
Stated Maturity | [2] | Sep. 15, 2037 |
[1] | Callable subject to certain conditions as described in the prospectus filed with the SEC on November 4, 2002.
[2] | Callable at any time.

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