Loans and Leases - Information Regarding Troubled Debt Restructurings (Details) - Non-Covered Loans - USD ($) $ in Millions		Jun. 30, 2022	Dec. 31, 2021
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		$ 45	$ 29
Accruing
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		16	16
Non-Accrual
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		29	13
Multi-Family
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		6	7
Multi-Family | Non-Accrual
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		6	7
Commercial Real Estate
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		35	16
Commercial Real Estate | Accruing
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		16	16
Commercial Real Estate | Non-Accrual
Financing Receivable Modifications [Line Items]
Troubled debt restructurings		19
Commercial and Industrial
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	[1]	4	6
Commercial and Industrial | Non-Accrual
Financing Receivable Modifications [Line Items]
Troubled debt restructurings	[1]	$ 4	$ 6

[1] Includes $4 million and $6 million of taxi medallion-related loans at June 30, 2022 and December 31, 2021, respectively.