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Loans and Leases - Additional Information (Details) | 12 Months Ended |
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Dec. 31, 2022 USD ($) Investment | Dec. 31, 2021 USD ($) Investment | Dec. 31, 2020 USD ($)
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Outstanding loans to Executive officers, directors, principal shareholders, related interest and parties |  | $ 101,000,000 |  | $ 6,000,000 |  |
Debt instrument, term |  | 10 years |  |  |  |
Loans with government guarantees |  | $ 1,200,000,000 |  |  |  |
Repurchase liability |  | 300,000,000 |  |  |  |
Repossessed assets and associated claims |  | 8,000,000 |  | 3,000,000 |  |
Total loans receivable | [1] | 69,001,000,000 |  | 45,738,000,000 |  |
Net gain on loan sales |  | 5,000,000 |  |  |  |
Flagstar |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loans held-for-sale |  | 1,100,000,000 |  | 0 |  |
Other Assets |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Repossessed assets and associated claims |  | 14,000,000 |  |  |  |
Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans receivable | [3] | $ 12,276,000,000 | [2] | $ 4,034,000,000 | [4] |
Loan classified as non accrual TDRs |  |  |  |  |  | $ 3,000,000
Number of financing receivable contracts modified as TDRs within previous 12 months, with payment default | Investment |  | 0 |  | 0 |  |
One-to-Four Family First Mortgage |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans receivable |  | $ 5,821,000,000 |  | $ 160,000,000 |  |
One-to-Four Family First Mortgage | Flagstar |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans receivable |  | 5,800,000,000 |  | 160,000,000 |  |
One-to-Four Family |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans receivable |  | 5,821,000,000 |  | 160,000,000 |  |
Other |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans receivable |  | 2,252,000,000 |  | 6,000,000 |  |
Other | Flagstar |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans receivable |  | 2,300,000,000 |  |  |  |
Residential Mortgage |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loans and leases receivable, loans in process of foreclosure |  | 121,000,000 |  | 0 |  |
Financing Receivable Troubled Debt Restructurings Rate Reductions |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Loans and leases receivable, loans in process of foreclosure |  | 38,000,000 |  |  |  |
Other Loans | Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |  |
Total loans receivable |  | $ 10,597,000,000 |  | $ 2,238,000,000 |  |
[1] | Excludes accrued interest receivable of $292 million and $199 million at December 31, 2022 and December 31, 2021, respectively, which is included in other assets in the Consolidated Statements of Condition.
[2] | Includes lease financing receivables, all of which were classified as Pass.
[3] | Includes specialty finance loans and leases of $4.4 billion and $3.5 billion, respectively, at December 31, 2022 and December 31, 2021.
[4] | Includes lease financing receivables, all of which were classified as Pass.

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