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Derivative and Hedging Activities - Derivatives Subject to a Master Netting Arrangement (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Designated as Hedging Instrument | Interest rate swaps on FHLB advances |  |
Liabilities |  |
Financial Instruments |  | $ 2
Cash Collateral Pledged (Received) |  | 75
Designated as Hedging Instrument | Interest rate swaps on multi-family loans held for investment |  |
Liabilities |  |
Financial Instruments |  | 1
Cash Collateral Pledged (Received) |  | 27
Derivatives not designated as hedging instruments: |  |
Assets |  |
Financial Instruments | $ 29 | 126
Cash Collateral Pledged (Received) | 0 | (35)
Liabilities |  |
Financial Instruments | 43 | 92
Cash Collateral Pledged (Received) | 124 | 102
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards |  |
Assets |  |
Financial Instruments | 6 | 11
Cash Collateral Pledged (Received) | 0 | (1)
Liabilities |  |
Financial Instruments | 12 | 32
Cash Collateral Pledged (Received) | 14 | 57
Derivatives not designated as hedging instruments: | Interest rate swaptions |  |
Assets |  |
Financial Instruments | 23 | 115
Cash Collateral Pledged (Received) | 0 | (34)
Derivatives not designated as hedging instruments: | Futures |  |
Liabilities |  |
Financial Instruments |  | 1
Cash Collateral Pledged (Received) |  | 3
Derivatives not designated as hedging instruments: | Interest rate swaps |  |
Liabilities |  |
Financial Instruments | 31 | 59
Cash Collateral Pledged (Received) | $ 110 | $ 42

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