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Derivative and Hedging Activities - Derivatives Subject to a Master Netting Arrangement (Details) - USD ($)
$ in Millions
Dec. 31, 2023
Dec. 31, 2022
Derivatives designated as cash flow hedging instruments: | Interest rate swaps    
Liabilities    
Gross Amount $ 2 $ 5
Gross Amounts Netted in the Statements of Condition 0 0
Net Amount Presented in the Statements of Condition 2 5
Financial Instruments 0 4
Cash Collateral Pledged (Received) 75 27
Derivatives designated as cash flow hedging instruments: | Interest rate swaps on multi-family loans held for investment(1)    
Liabilities    
Gross Amount 1  
Gross Amounts Netted in the Statements of Condition 0  
Net Amount Presented in the Statements of Condition 1  
Financial Instruments 0  
Cash Collateral Pledged (Received) 27  
Derivatives not designated as hedging instruments:    
Assets    
Gross Amount 126 220
Gross Amounts Netted in the Statements of Condition 0 0
Net Amount Presented in the Statements of Condition 126 220
Financial Instruments 0 0
Cash Collateral Pledged (Received) (35) (44)
Liabilities    
Gross Amount 92 126
Gross Amounts Netted in the Statements of Condition 0 0
Net Amount Presented in the Statements of Condition 92 126
Financial Instruments 0 0
Cash Collateral Pledged (Received) 102 83
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards    
Assets    
Gross Amount 11 36
Gross Amounts Netted in the Statements of Condition 0 0
Net Amount Presented in the Statements of Condition 11 36
Financial Instruments 0 0
Cash Collateral Pledged (Received) (1) (9)
Liabilities    
Gross Amount 32 61
Gross Amounts Netted in the Statements of Condition 0 0
Net Amount Presented in the Statements of Condition 32 61
Financial Instruments 0 0
Cash Collateral Pledged (Received) 57 54
Derivatives not designated as hedging instruments: | Interest rate swaptions    
Assets    
Gross Amount 115 182
Gross Amounts Netted in the Statements of Condition 0 0
Net Amount Presented in the Statements of Condition 115 182
Financial Instruments 0 0
Cash Collateral Pledged (Received) (34) (36)
Derivatives not designated as hedging instruments: | Futures    
Assets    
Gross Amount   2
Gross Amounts Netted in the Statements of Condition  
Net Amount Presented in the Statements of Condition   2
Financial Instruments  
Cash Collateral Pledged (Received)   1
Liabilities    
Gross Amount 1  
Gross Amounts Netted in the Statements of Condition 0  
Net Amount Presented in the Statements of Condition 1  
Financial Instruments 0  
Cash Collateral Pledged (Received) 3  
Derivatives not designated as hedging instruments: | Interest rate swaps    
Liabilities    
Gross Amount 59 65
Gross Amounts Netted in the Statements of Condition 0 0
Net Amount Presented in the Statements of Condition 59 65
Financial Instruments 0 0
Cash Collateral Pledged (Received) $ 42 $ 29