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Summary of Significant Accounting Policies - Additional Information (Detail) | 12 Months Ended |
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Dec. 31, 2022 USD ($) Segment shares | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | [1]
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Cash and cash equivalents, interest-bearing deposits in other financial institutions | $ 2,032,000,000 | $ 2,211,000,000 | [1] | $ 1,948,000,000 | [1] | $ 742,000,000
Cash and cash equivalents, interest-bearing deposits in other financial institutions, Federal Reserve Bank of New York | 837,000,000 | 1,700,000,000 |  |  |  |
Cash and cash equivalents, federal funds sold | 0 | 0 |  |  |  |
Cash and cash equivalents, outstanding reverse repurchase agreements | 793,000,000 | 406,000,000 |  |  |  |
Allowance for credit losses | 23,000,000 | 12,000,000 |  |  |  |
Goodwill | $ 2,426,000,000 | 2,426,000,000 |  |  |  |
Number of operating segments | Segment | 1 |  |  |  |  |
Number of reportable segments | Segment | 1 |  |  |  |  |
Goodwill impairment | $ 0 |  |  |  |  |
Depreciation | 18,000,000 | 21,000,000 |  | 24,000,000 |  |
Bank-owned life insurance | 1,561,000,000 | 1,184,000,000 |  |  |  |
Bank-owned life insurance income | 32,000,000 | 29,000,000 |  | $ 32,000,000 |  |
Other real estate owned | 8,000,000 | 3,000,000 |  |  |  |
Estimate fair value of mortgage loans | $ 10,000,000 | 2,000,000 |  |  |  |
Shares available for grant | shares | 9,799,865 |  |  |  |  |
Restricted cash | $ 50,000,000 |  |  |  |  |
Commercial Real Estate |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Percentage of loan portfolio | 70.50% |  |  |  |  |
2020 Incentive Plan |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Shares available for grant | shares | 5,774,229 |  |  |  |  |
Taxi Medallion Loans |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Other real estate owned | $ 4,000,000 | $ 5,000,000 |  |  |  |
Flagstar |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Bank-owned life insurance | $ 373,000,000 |  |  |  |  |
Shares available for grant | shares | 4,025,636 |  |  |  |  |
Premises |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) | 20 years |  |  |  |  |
Furniture, Fixtures and Equipment | Minimum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) | 3 years |  |  |  |  |
Furniture, Fixtures and Equipment | Maximum |  |  |  |  |  |
Significant Accounting Policies [Line Items] |  |  |  |  |  |
Premises, furniture, fixtures, and equipment, estimated useful lives (in years) | 10 years |  |  |  |  |
[1] | For further information on restricted cash, see Note 14 - Derivatives and Hedging Activities.

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