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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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