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Derivative and Hedging Activities - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions	Sep. 30, 2024	Dec. 31, 2023
Derivatives not designated as hedging instruments: | Futures | Other Assets
Assets
Notional Amount	$ 870	$ 0
Fair Value	0	0
Liabilities
Fair Value		0
Derivatives not designated as hedging instruments: | Futures | Other Liabilities
Assets
Fair Value	0	0
Liabilities
Notional Amount		2,235
Fair Value		1
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Assets
Assets
Notional Amount	1,469	1,012
Fair Value	6	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	742	1,048
Fair Value	12	32
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Assets
Assets
Notional Amount	1,996	1,490
Fair Value	11	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	464	77
Fair Value	3	3
Derivatives not designated as hedging instruments: | Interest rate swaps and swaptions | Other Assets
Assets
Notional Amount	1,505	5,431
Fair Value	23	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	2,646	2,720
Fair Value	$ 31	59
Designated as Hedging Instrument | Interest rate swaps on FHLB advances | Cash flow hedging
Liabilities
Notional Amount		5,500
Designated as Hedging Instrument | Interest rate swaps on FHLB advances | Other Assets | Cash flow hedging
Liabilities
Fair Value		0
Designated as Hedging Instrument | Interest rate swaps on FHLB advances | Other Liabilities | Cash flow hedging
Liabilities
Fair Value		2
Designated as Hedging Instrument | Interest rate swaps on multi-family loans held for investment | Fair value hedging
Liabilities
Notional Amount		2,000
Designated as Hedging Instrument | Interest rate swaps on multi-family loans held for investment | Other Assets | Fair value hedging
Liabilities
Fair Value		0
Designated as Hedging Instrument | Interest rate swaps on multi-family loans held for investment | Other Liabilities | Fair value hedging
Liabilities
Fair Value		$ 1

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