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Loans and Leases - Summary of Financial Effects of Troubled Debt Restructurings (Details) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 USD ($) Investment | Jun. 30, 2021 USD ($) Investment | Jun. 30, 2020 USD ($) Investment
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 12 |  | 20
Pre-Modification Recorded Investment | $ 17 |  | $ 19
Post-Modification Recorded Investment | $ 16 |  | $ 18
Weighted Average Interest Rate, Pre-Modification | 7.28% |  | 6.89%
Weighted Average Interest Rate, Post-Modification | 3.45% |  | 3.42%
Trouble debt restructuring, charge-off amount | $ 1 |  | $ 1
Commercial and Industrial |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 11 |  | 19
Pre-Modification Recorded Investment | $ 2 |  | $ 4
Post-Modification Recorded Investment | $ 1 |  | $ 3
Weighted Average Interest Rate, Pre-Modification | 2.92% |  | 3.08%
Weighted Average Interest Rate, Post-Modification | 2.92% |  | 3.03%
Trouble debt restructuring, charge-off amount | $ 1 |  | $ 1
Commercial Real Estate |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment | 1 |  | 1
Pre-Modification Recorded Investment | $ 15 |  | $ 15
Post-Modification Recorded Investment | $ 15 |  | $ 15
Weighted Average Interest Rate, Pre-Modification | 8.00% |  | 8.00%
Weighted Average Interest Rate, Post-Modification | 3.50% |  | 3.50%
Multi-Family |  |  |
Financing Receivable Modifications [Line Items] |  |  |
Number of loans classified as a non-accrual TDRs | Investment |  | 1 |
Pre-Modification Recorded Investment |  | $ 7 |
Post-Modification Recorded Investment |  | $ 7 |
Weighted Average Interest Rate, Pre-Modification |  | 3.13% |
Weighted Average Interest Rate, Post-Modification |  | 3.25% |

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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=121611835&loc=SL6953676-111524 + Details
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