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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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