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Loans and Leases - Summary of Financial Effects of Troubled Debt Restructurings (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 USD ($) Investment | Sep. 30, 2020 USD ($) Investment | Sep. 30, 2021 USD ($) Investment | Sep. 30, 2020 USD ($) Investment
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  |  | 3 | 43
Pre-Modification Recorded Investment |  |  | $ 12 | $ 24
Post-Modification Recorded Investment |  |  | $ 12 | $ 23
Weighted Average Interest Rate, Pre-Modification |  |  | 4.18% | 5.91%
Weighted Average Interest Rate, Post-Modification |  |  | 3.36% | 3.08%
Trouble debt restructuring, charge-off amount |  |  |  | $ 1
Commercial and Industrial |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 23 |  | 42
Pre-Modification Recorded Investment |  | $ 5 |  | $ 9
Post-Modification Recorded Investment |  | $ 5 |  | $ 8
Weighted Average Interest Rate, Pre-Modification |  | 1.66% |  | 2.36%
Weighted Average Interest Rate, Post-Modification |  | 1.66% |  | 2.20%
Trouble debt restructuring, charge-off amount |  |  |  | $ 1
Commercial Real Estate |  |  |  |
Financing Receivable Modifications [Line Items] |  |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 2 |  | 2 | 1
Pre-Modification Recorded Investment | $ 4 |  | $ 4 | $ 15
Post-Modification Recorded Investment | $ 4 |  | $ 4 | $ 15
Weighted Average Interest Rate, Pre-Modification | 6.00% |  | 6.00% | 8.00%
Weighted Average Interest Rate, Post-Modification | 3.55% |  | 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% |

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