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Derivative and Hedging Activities - Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($)
$ in Millions
Sep. 30, 2023
Dec. 31, 2022
Derivatives designated hedging instruments: | Cash flow hedging    
Liabilities    
Notional Amount $ 5,500 $ 3,750
Derivatives designated hedging instruments: | Other Assets | Cash flow hedging    
Liabilities    
Fair Value 0 5
Derivatives designated hedging instruments: | Other Liabilities | Cash flow hedging    
Liabilities    
Fair Value 5 0
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances    
Liabilities    
Fair Value 5 5
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Cash flow hedging    
Liabilities    
Notional Amount 5,500 3,750
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Other Assets | Cash flow hedging    
Liabilities    
Fair Value 0 5
Derivatives designated hedging instruments: | Interest rate swaps on FHLB advances | Other Liabilities | Cash flow hedging    
Liabilities    
Fair Value 5 0
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 178 220
Liabilities    
Fair Value 95 126
Derivatives not designated as hedging instruments: | Other Assets    
Assets    
Notional Amount 11,780 11,403
Fair Value 184 229
Liabilities    
Fair Value 0 0
Derivatives not designated as hedging instruments: | Other Liabilities    
Assets    
Fair Value 0 0
Liabilities    
Notional Amount 4,118 3,711
Fair Value 107 136
Derivatives not designated as hedging instruments: | Futures    
Assets    
Fair Value 1 2
Liabilities    
Fair Value 0  
Derivatives not designated as hedging instruments: | Futures | Other Assets    
Assets    
Notional Amount 2,630 1,205
Fair Value 1 2
Derivatives not designated as hedging instruments: | Futures | Other Liabilities    
Assets    
Fair Value 0 0
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards    
Assets    
Fair Value 37 36
Liabilities    
Fair Value 16 61
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Other Assets    
Assets    
Notional Amount 1,861 1,065
Fair Value 37 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 710 739
Fair Value 16 61
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Assets    
Assets    
Notional Amount 1,352 1,539
Fair Value 6 9
Liabilities    
Fair Value 0 0
Derivatives not designated as hedging instruments: | Rate lock commitments | Other Liabilities    
Assets    
Fair Value 0 0
Liabilities    
Notional Amount 702 527
Fair Value 12 10
Derivatives not designated as hedging instruments: | Interest rate swaps and swaptions | Other Assets    
Assets    
Notional Amount 5,937 7,594
Fair Value 140 182
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 2,706 2,445
Fair Value $ 79 $ 65