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Loans and Leases - Summary of Financial Effects of Troubled Debt Restructurings (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2021 USD ($) Investment | Dec. 31, 2020 USD ($) Investment | Dec. 31, 2019 USD ($) Investment
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 3 | 43 | 73
Pre-Modification Recorded Investment | $ 12 | $ 24 | $ 35
Post-Modification Recorded Investment | $ 12 | 23 | 31
Trouble debt restructuring, charge-off amount |  | $ 1 | $ 4
Commercial Real Estate |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 2 | 1 |
Pre-Modification Recorded Investment | $ 4 | $ 15 |
Post-Modification Recorded Investment | $ 4 | $ 15 |
Weighted Average Interest Rate, Pre-Modification | 6.00% | 8.00% |
Weighted Average Interest Rate, Post-Modification | 3.55% | 3.50% |
Multi-Family |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 1 |  |
Pre-Modification Recorded Investment | $ 8 |  |
Post-Modification Recorded Investment | $ 8 |  |
Weighted Average Interest Rate, Pre-Modification | 3.13% |  |
Weighted Average Interest Rate, Post-Modification | 3.25% |  |
Commercial and Industrial |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 42 | 72
Pre-Modification Recorded Investment |  | $ 9 | $ 35
Post-Modification Recorded Investment |  | $ 8 | $ 31
Weighted Average Interest Rate, Pre-Modification |  | 2.36% | 4.31%
Weighted Average Interest Rate, Post-Modification |  | 2.23% | 4.37%
Trouble debt restructuring, charge-off amount |  | $ 1 | $ 4
One-to-Four Family |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 1
Weighted Average Interest Rate, Pre-Modification |  |  | 5.50%
Weighted Average Interest Rate, Post-Modification |  |  | 5.50%

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- Definition Number of financing receivables that have been modified by troubled debt restructurings. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=123577603&loc=SL6953676-111524 + Details
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