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Borrowed Funds - Narrative (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Nov. 04, 2002 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Debt Instrument |  |  |  |
Interest payable |  | $ 51,000,000 | $ 50,000,000 |
FHLB lock out term |  | 5 years |  |
FHLB interest expense |  | $ 1,000,000,000 | 564,000,000 | $ 251,000,000
Offering price (in dollars per share) |  | $ 7.50 |  |
Warrant or right, coupon rate | 6.00% |  |  |
Warrant term | 49 years |  |  |
Noncallable term | 5 years |  |  |
Issuance of warrants to purchase common shares |  | $ 302,000,000 |  |
Settlement terms, fair value of shares amount |  | 182,600,000 |  |
Unamortized discount |  | $ 63,000,000 |  |
Settlement terms, period |  | 49 years |  |
Outstanding principal amount |  | $ 212,000,000 |  |
Deferrable term |  | 5 years |  |
Junior subordinated debenture, interest expense |  | $ 49,000,000 | 48,000,000 | $ 22,000,000
Subordinated notes |  | 444,000,000 | 438,000,000 |
New York Community Capital Trust V (BONUSES Units) |  |  |  |
Debt Instrument |  |  |  |
Junior subordinated debentures |  | 148,000,000 |  |
Unamortized discount |  | 92,400,000 |  |
Additional Paid-in Capital |  |  |  |
Debt Instrument |  |  |  |
Issuance of warrants to purchase common shares |  | 302,000,000 |  |
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 |  |  |
As Initially Reported |  |  |  |
Debt Instrument |  |  |  |
Junior subordinated debentures |  | $ 610,000,000 | $ 609,000,000 |

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