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Derivative and Hedging Activities - Derivatives Subject to a Master Netting Arrangement (Details) - USD ($) $ in Millions | Dec. 31, 2024 | Dec. 31, 2023
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Derivatives designated as cash flow hedging instruments: | Interest rate swaps on FHLB advances |  |
Liabilities |  |
Financial Instruments |  | $ 2
Cash Collateral Pledged (Received) |  | 75
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment |  |
Liabilities |  |
Financial Instruments |  | 1
Cash Collateral Pledged (Received) |  | 27
Interest rate swaps on multi-family loans held for investment |  |
Assets |  |
Financial Instruments | $ 22 | 126
Cash Collateral Pledged (Received) | (5) | (35)
Liabilities |  |
Financial Instruments | 32 | 92
Cash Collateral Pledged (Received) | 57 | 102
Interest rate swaps on multi-family loans held for investment | Mortgage-backed securities forwards |  |
Assets |  |
Financial Instruments | 7 | 11
Cash Collateral Pledged (Received) | (2) | (1)
Liabilities |  |
Financial Instruments | 2 | 32
Cash Collateral Pledged (Received) | 10 | 57
Interest rate swaps on multi-family loans held for investment | Interest rate swaptions |  |
Assets |  |
Financial Instruments | 15 | 115
Cash Collateral Pledged (Received) | (3) | (34)
Interest rate swaps on multi-family loans held for investment | Futures |  |
Liabilities |  |
Financial Instruments |  | 1
Cash Collateral Pledged (Received) |  | 3
Interest rate swaps on multi-family loans held for investment | Interest rate swaps |  |
Liabilities |  |
Financial Instruments | 30 | 59
Cash Collateral Pledged (Received) | $ 47 | $ 42

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