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Borrowed Funds - Narrative (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 04, 2007 | Nov. 04, 2002 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument |  |  |  |  |
Interest payable |  |  | $ 50,000,000 | $ 37,000,000 |
Long-term debt |  |  | $ 21,267,000,000 | $ 21,332,000,000 |
FHLB advances, weighted average interest rate |  |  | 508.00% | 348.00% |
FHLB advances, average amount overnight |  |  | $ 624,000,000 | $ 318,000,000 |
FHLB interest expense |  |  | 564,000,000 | 251,000,000 | $ 233,000,000
Repurchase agreements, interest expense |  |  | 0 | 14,000,000 | 18,000,000
Federal funds purchased, average balance |  |  | $ 196,000,000 | $ 466,000,000 |
Federal funds purchased, weighted average interest rate |  |  | 501.00% | 165.00% |
Federal funds purchased, interest expense |  |  | $ 10,000,000 | $ 8,000,000 | 0
Junior subordinated debentures |  |  | 579,000,000 | 575,000,000 |
Offering price (in dollars per share) |  | $ 20.04 |  |  |
Number of securities called by each warrant (in shares) |  | 2.4953 |  |  |
Number of securities called by warrant (in shares) |  | 14,000,000 |  |  |
Warrant term |  | 49 years |  |  |
Liquidation amount (in dollars per share) |  | $ 50.00 |  |  |
Noncallable term | 5 years | 5 years |  |  |
Settlement terms, fair value of shares amount |  |  | $ 182,600,000 |  |
Settlement terms, period |  |  | 49 years |  |
Unamortized discount |  |  | $ 64,000,000 |  |
Deferrable term |  |  | 5 years |  |
Junior subordinated debenture, interest expense |  |  | $ 48,000,000 | 22,000,000 | $ 18,000,000
Subordinated notes |  |  | $ 438,000,000 | 432,000,000 |
FHLB lock out term |  |  | 5 years |  |
Warrant Or Right, Coupon Rate |  | 600.00% |  |  |
New York Community Capital Trust V (BONUSES Units) |  |  |  |  |
Debt Instrument |  |  |  |  |
Junior subordinated debentures |  |  | $ 147,000,000 |  |
Unamortized discount |  |  | 92,400,000 |  |
Additional Paid-in Capital [Member] |  |  |  |  |
Debt Instrument |  |  |  |  |
Adjustments to warrants issued |  |  | 92,400,000 |  |
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 |  |
Total wholesale borrowings |  |  |  |  |
Debt Instrument |  |  |  |  |
Unused lines of credit available |  |  | 8,400,000,000 | 11,300,000,000 |
Long-term debt |  |  | 20,250,000,000 | 20,325,000,000 |
FHLB advances |  |  |  |  |
Debt Instrument |  |  |  |  |
Long-term debt |  |  | 19,250,000,000 | 20,325,000,000 |
FHLB advances, overnight |  |  | 0 | 2,800,000,000 |
Previously Reported |  |  |  |  |
Debt Instrument |  |  |  |  |
Junior subordinated debentures |  |  | $ 609,000,000 | $ 608,000,000 |

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- Definition The fair value of shares that would be issued, determined under the conditions specified in the contract if the settlement were to occur at the reporting date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481648/480-10-50-2 + Details
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