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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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