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Loans and Leases - TDRs (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Modified [Line Items] |  |
Accruing |  | $ 16
Non- Accrual |  | 28
Total | $ 262 | 44
Mortgage Loans | Multi-family |  |
Financing Receivable, Modified [Line Items] |  |
Accruing |  | 0
Non- Accrual |  | 6
Total | 122 | 6
Mortgage Loans | Commercial real estate |  |
Financing Receivable, Modified [Line Items] |  |
Accruing |  | 16
Non- Accrual |  | 19
Total | 103 | 35
Mortgage Loans | One-to-four family first mortgage |  |
Financing Receivable, Modified [Line Items] |  |
Total | 14 |
Other Loans: | Commercial and industrial |  |
Financing Receivable, Modified [Line Items] |  |
Accruing |  | 0
Non- Accrual |  | 3
Total | 21 | $ 3
Other Loans: | Other |  |
Financing Receivable, Modified [Line Items] |  |
Total | $ 2 |

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