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Borrowed Funds - Additional Information (Details) |  | 12 Months Ended
--- | --- | ---
Nov. 04, 2002 USD ($) Age $ / shares shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |
Accrued interest |  | $ 18,000,000 | $ 19,000,000 |
Interest expense |  | 286,000,000 | 302,000,000 | $ 318,000,000
Federal funds purchased outstanding amount |  | 0 | 0 |
Federal funds purchased, average balance |  | $ 81,000,000 | $ 180,000,000 |
Federal fund purchased Weighted average interest rate |  | 0.09% | 0.49% |
Federal fund purchased, interest expenses |  | $ 0 | $ 1,000,000 | 0
Junior subordinated debentures |  | 361,000,000 | 360,000,000 |
Gross proceeds of BONUSES, debt |  | 2,072,000,000 | 6,925,000,000 | 4,786,000,000
Subordinated notes outstanding |  | 296,000,000 | 296,000,000 |
Interest expense on subordinated notes |  | 18,000,000 | 18,000,000 | 18,000,000
Repurchase Agreements |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Accrued interest |  | 2,000,000 | 2,000,000 |
Interest expense |  | 18,000,000 | 18,000,000 | 18,000,000
Short-term debt outstanding amount |  | 0 | 0 |
Federal Home Loan Bank Advances |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense |  | 233,000,000 | 246,000,000 | 259,000,000
BONUSESSM units | New York Community Capital Trust V (BONUSESSM Units) |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Public offering of Bifurcated Option Note Unit Securities ("BONUSES units") | shares | 5,500,000 |  |  |
Public offering of units, offering price per share | $ / shares | $ 50.00 |  |  |
Warrants and capital securities non-callable period | 5 years |  |  |
Gross proceeds of BONUSES, debt | $ 275,000,000.0 |  |  |
Difference between the assigned value and the stated liquidation amount of the capital securities is treated as an original issue discount | $ 92,400,000 |  |  |
Original issue discount amortized amount |  | 65,000,000 |  |
BONUSESSM units | New York Community Capital Trust V (BONUSESSM Units) | Capital Units |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Warrant to purchase, number of shares | Age | 2.4953 |  |  |
Warrant to purchase, total number of shares | shares | 13,700,000 |  |  |
Warrant to purchase, exercise price per share | $ / shares | $ 20.04 |  |  |
Capital security, term (in years) | 49 years |  |  |
Capital security, coupon or distribution rate | 6.00% |  |  |
Capital security, per share liquidation amount | $ / shares | $ 50.00 |  |  |
Gross proceeds of BONUSES | $ 182,600,000 |  |  |
BONUSESSM units | New York Community Capital Trust V (BONUSESSM Units) | Warrant |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Gross proceeds of BONUSES | $ 92,400,000 |  |  |
Junior Subordinated Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest expense |  | 18,000,000 | 19,000,000 | $ 22,000,000
FHLB - NY |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Unused line of credit |  | 8,400,000,000 | 7,300,000,000 |
Overnight FHLB advances |  | 0 | 0 |
Line of credit, average balance |  | $ 6,000,000 | $ 2,000,000 |
Line of credit, weighted average interest rate |  | 0.36% | 1.20% |

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