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Derivative and Hedging Activities - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | ---
Derivatives designated as cash flow hedging instruments: | Cash flow hedging |  |
Liabilities |  |
Notional Amount | $ 5,500 | $ 3,750
Derivatives designated as cash flow hedging instruments: | Other Assets | Cash flow hedging |  |
Liabilities |  |
Fair Value | 0 | 5
Derivatives designated as cash flow hedging instruments: | Other Liabilities | Cash flow hedging |  |
Liabilities |  |
Fair Value | 2 | 0
Derivatives designated as cash flow hedging instruments: | Interest rate swaps |  |
Liabilities |  |
Fair Value | 2 | 5
Derivatives designated as cash flow hedging instruments: | Interest rate swaps | Cash flow hedging |  |
Liabilities |  |
Notional Amount | 5,500 | 3,750
Derivatives designated as cash flow hedging instruments: | Interest rate swaps | Other Assets | Cash flow hedging |  |
Liabilities |  |
Fair Value | 0 | 5
Derivatives designated as cash flow hedging instruments: | Interest rate swaps | Other Liabilities | Cash flow hedging |  |
Liabilities |  |
Fair Value | 2 | 0
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment(1) |  |
Liabilities |  |
Fair Value | 1 |
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment(1) | Fair value hedging |  |
Liabilities |  |
Notional Amount | 2,000 |
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment(1) | Other Assets | Fair value hedging |  |
Liabilities |  |
Fair Value | 0 |
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment(1) | Other Liabilities | Fair value hedging |  |
Liabilities |  |
Fair Value | 1 |
Derivatives not designated as hedging instruments: |  |
Assets |  |
Fair Value | 126 | 220
Liabilities |  |
Fair Value | 92 | 126
Derivatives not designated as hedging instruments: | Other Assets |  |
Assets |  |
Notional Amount | 7,933 | 11,403
Fair Value | 138 | 229
Liabilities |  |
Fair Value | 0 | 0
Derivatives not designated as hedging instruments: | Other Liabilities |  |
Assets |  |
Fair Value | 0 | 0
Liabilities |  |
Notional Amount | 6,080 | 3,711
Fair Value | 95 | 136
Derivatives not designated as hedging instruments: | Futures |  |
Assets |  |
Fair Value |  | 2
Liabilities |  |
Fair Value | 1 |
Derivatives not designated as hedging instruments: | Futures | Other Assets |  |
Assets |  |
Notional Amount |  | 1,205
Fair Value |  | 2
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 | 11 | 36
Liabilities |  |
Fair Value | 32 | 61
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Assets |  |
Assets |  |
Notional Amount | 1,012 | 1,065
Fair Value | 11 | 36
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 | 1,048 | 739
Fair Value | 32 | 61
Derivatives not designated as hedging instruments: | Rate lock commitments (fallout-adjusted) | Other Assets |  |
Assets |  |
Notional Amount | 1,490 | 1,539
Fair Value | 12 | 9
Liabilities |  |
Fair Value | 0 | 0
Derivatives not designated as hedging instruments: | Rate lock commitments (fallout-adjusted) | Other Liabilities |  |
Assets |  |
Fair Value | 0 | 0
Liabilities |  |
Notional Amount | 77 | 527
Fair Value | 3 | 10
Derivatives not designated as hedging instruments: | Interest rate swaps and swaptions | Other Assets |  |
Assets |  |
Notional Amount | 5,431 | 7,594
Fair Value | 115 | 182
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 | 2,720 | 2,445
Fair Value | $ 59 | $ 65

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