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Loans and Leases - Loan Modifications (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 262 | $ 44
Mortgage Loans | Multi-family |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 122 | 6
Percent of Total Loan class | 1.17% |
Mortgage Loans | Commercial real estate |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 103 | 35
Percent of Total Loan class | 0.98% |
Mortgage Loans | One-to-four family first mortgage |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 14 |
Percent of Total Loan class | 0.23% |
Other Loans: | Commercial and industrial |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 21 | $ 3
Percent of Total Loan class | 0.08% |
Other Loans: | Other |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 2 |
Percent of Total Loan class | 0.08% |
Interest Rate Reduction |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 227 |
Interest Rate Reduction | Mortgage Loans | Multi-family |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 122 |
Interest Rate Reduction | Mortgage Loans | Multi-family | Minimum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 7.45% |
Interest Rate Reduction | Mortgage Loans | Multi-family | Maximum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 6.02% |
Interest Rate Reduction | Mortgage Loans | Commercial real estate |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 102 |
Interest Rate Reduction | Mortgage Loans | Commercial real estate | Minimum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 8.83% |
Interest Rate Reduction | Mortgage Loans | Commercial real estate | Maximum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 4.56% |
Interest Rate Reduction | Mortgage Loans | One-to-four family first mortgage |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 3 |
Weighted-average Term (in years) |  |
Interest Rate Reduction | Mortgage Loans | One-to-four family first mortgage | Minimum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 6.08% |
Interest Rate Reduction | Mortgage Loans | One-to-four family first mortgage | Maximum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 4.79% |
Interest Rate Reduction | Mortgage Loans | Commercial and industrial |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average Term (in years) | 6 months 29 days |
Interest Rate Reduction | Mortgage Loans | Commercial and industrial | Minimum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 8.44% |
Interest Rate Reduction | Mortgage Loans | Commercial and industrial | Maximum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 8.08% |
Interest Rate Reduction | Mortgage Loans | Other |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average Term (in years) |  |
Interest Rate Reduction | Mortgage Loans | Other | Minimum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 9.09% |
Interest Rate Reduction | Mortgage Loans | Other | Maximum |  |
Financing Receivable, Modified [Line Items] |  |
Weighted-average contractual interest rate | 4.82% |
Interest Rate Reduction | Other Loans: | Commercial and industrial |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 0 |
Interest Rate Reduction | Other Loans: | Other |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 0 |
Term Extension |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 25 |
Term Extension | Mortgage Loans | Multi-family |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 0 |
Term Extension | Mortgage Loans | Commercial real estate |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 1 |
Term Extension | Mortgage Loans | One-to-four family first mortgage |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 5 |
Term Extension | Other Loans: | Commercial and industrial |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 19 |
Term Extension | Other Loans: | Other |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 0 |
Combination - Interest Rate Reduction & Term Extension |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 10 |
Combination - Interest Rate Reduction & Term Extension | Mortgage Loans | Multi-family |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 0 |
Combination - Interest Rate Reduction & Term Extension | Mortgage Loans | Commercial real estate |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 0 |
Combination - Interest Rate Reduction & Term Extension | Mortgage Loans | One-to-four family first mortgage |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 6 |
Combination - Interest Rate Reduction & Term Extension | Other Loans: | Commercial and industrial |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | 2 |
Combination - Interest Rate Reduction & Term Extension | Other Loans: | Other |  |
Financing Receivable, Modified [Line Items] |  |
Amortized Cost | $ 2 |

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- Definition Amortized cost excluding accrued interest, of financing receivable modified during period for debtor experiencing financial difficulty. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 310 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 42 -Subparagraph (a)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481962/310-10-50-42 + Details
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