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Loans and Leases - Loan Modifications (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 188 | $ 253 | $ 45
Mortgage Loans: | Multi-family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 100 | $ 100 | 6
Percent of Total Loan class | 0.95% | 0.95% |
Mortgage Loans: | Commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 67 | $ 119 | 35
Percent of Total Loan class | 0.64% | 1.13% |
Mortgage Loans: | One-to-four family first mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 6 | $ 12 |
Percent of Total Loan class | 0.10% | 0.20% |
Other Loans: | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 1 | $ 1 |
Percent of Total Loan class | 0.04% | 0.04% |
Other Loans: | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 14 | $ 21 | $ 4
Percent of Total Loan class | 0.07% | 0.09% |
Interest Rate Reduction |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 171 | $ 223 |
Interest Rate Reduction | Mortgage Loans: | Multi-family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 100 | $ 100 |
Interest Rate Reduction | Mortgage Loans: | Multi-family | Minimum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 7.73% | 7.73% |
Interest Rate Reduction | Mortgage Loans: | Multi-family | Maximum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 6.17% | 6.17% |
Interest Rate Reduction | Mortgage Loans: | Commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 67 | $ 119 |
Interest Rate Reduction | Mortgage Loans: | Commercial real estate | Minimum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 10.77% | 10.48% |
Interest Rate Reduction | Mortgage Loans: | Commercial real estate | Maximum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 4.32% | 4.18% |
Interest Rate Reduction | Mortgage Loans: | One-to-four family first mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 3 | $ 3 |
Weighted-average Term (in years) | 9 years 10 months 24 days | 12 years 1 month 6 days |
Interest Rate Reduction | Mortgage Loans: | One-to-four family first mortgage | Minimum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 0.00% | 0.00% |
Interest Rate Reduction | Mortgage Loans: | One-to-four family first mortgage | Maximum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 0.00% | 0.00% |
Interest Rate Reduction | Mortgage Loans: | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average Term (in years) | 4 months 9 days | 5 months 15 days |
Interest Rate Reduction | Mortgage Loans: | Commercial and industrial | Minimum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 8.02% | 8.02% |
Interest Rate Reduction | Mortgage Loans: | Commercial and industrial | Maximum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 7.74% | 7.74% |
Interest Rate Reduction | Mortgage Loans: | Other Consumer |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average Term (in years) | 4 years 9 months 18 days | 4 years 9 months 18 days |
Interest Rate Reduction | Mortgage Loans: | Other Consumer | Minimum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 9.28% | 14.49% |
Interest Rate Reduction | Mortgage Loans: | Other Consumer | Maximum |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Weighted-average contractual interest rate | 4.75% | 8.00% |
Interest Rate Reduction | Other Loans: | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 0 | $ 0 |
Interest Rate Reduction | Other Loans: | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 1 | 1 |
Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 12 | 22 |
Term Extension | Mortgage Loans: | Multi-family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 0 | 0 |
Term Extension | Mortgage Loans: | Commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 0 | 0 |
Term Extension | Mortgage Loans: | One-to-four family first mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 1 | 4 |
Term Extension | Other Loans: | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 0 | 0 |
Term Extension | Other Loans: | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 11 | 18 |
Combination - Interest Rate Reduction & Term Extension |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 5 | 8 |
Combination - Interest Rate Reduction & Term Extension | Mortgage Loans: | Multi-family |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 0 | 0 |
Combination - Interest Rate Reduction & Term Extension | Mortgage Loans: | Commercial real estate |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 0 | 0 |
Combination - Interest Rate Reduction & Term Extension | Mortgage Loans: | One-to-four family first mortgage |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 2 | 5 |
Combination - Interest Rate Reduction & Term Extension | Other Loans: | Other |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | 1 | 1 |
Combination - Interest Rate Reduction & Term Extension | Other Loans: | Commercial and industrial |  |  |
Financing Receivable, Troubled Debt Restructuring [Line Items] |  |  |
Amortized Cost | $ 2 | $ 2 |

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