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Derivative and Hedging Activities - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances
Liabilities
Fair Value		$ 2
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Cash flow hedging
Liabilities
Notional Amount		5,500
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Other Assets | Cash flow hedging
Liabilities
Fair Value		0
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Other Liabilities | Cash flow hedging
Liabilities
Fair Value		2
Derivatives designated hedging instruments: | Interest rate swaps on multi-family loans held for investment
Liabilities
Fair Value		1
Derivatives designated hedging instruments: | Interest rate swaps on multi-family loans held for investment | Fair value hedging
Liabilities
Notional Amount		2,000
Derivatives designated hedging instruments: | Interest rate swaps on multi-family loans held for investment | Other Assets | Fair value hedging
Liabilities
Fair Value		0
Derivatives designated hedging instruments: | Interest rate swaps on multi-family loans held for investment | Other Liabilities | Fair value hedging
Liabilities
Fair Value		1
Derivatives not designated as hedging instruments:
Assets
Fair Value	$ 120	126
Liabilities
Fair Value	72	92
Derivatives not designated as hedging instruments: | Futures
Assets
Fair Value	0
Liabilities
Fair Value	0	1
Derivatives not designated as hedging instruments: | Futures | Other Assets
Assets
Notional Amount	765
Fair Value	0
Liabilities
Fair Value		0
Derivatives not designated as hedging instruments: | Futures | Other Liabilities
Assets
Fair Value	0
Liabilities
Notional Amount		2,235
Fair Value		1
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards
Assets
Fair Value	9	11
Liabilities
Fair Value	9	32
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Assets
Assets
Notional Amount	1,823	1,012
Fair Value	9	11
Liabilities
Fair Value	0	0
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Liabilities
Assets
Fair Value	0	0
Liabilities
Notional Amount	958	1,048
Fair Value	9	32
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Assets
Assets
Notional Amount	1,951	1,490
Fair Value	9	12
Liabilities
Fair Value	0	0
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Liabilities
Assets
Fair Value	0	0
Liabilities
Notional Amount	563	77
Fair Value	5	3
Derivatives not designated as hedging instruments: | Interest rate swaps and swaptions | Other Assets
Assets
Notional Amount	5,335	5,431
Fair Value	111	115
Liabilities
Fair Value	0	0
Derivatives not designated as hedging instruments: | Interest rate swaps and swaptions | Other Liabilities
Assets
Fair Value	0	0
Liabilities
Notional Amount	3,310	2,720
Fair Value	$ 63	$ 59

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