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Derivatives and Hedging Activities (Derivatives in Statement of Condition) (Details) - USD ($)
$ in Millions
Mar. 31, 2020
Dec. 31, 2019
Derivatives, Fair Value [Line Items]    
Derivatives, Notional Amount $ 118,867 $ 101,072
Derivative Assets 45 44
Netting adjustments and cash collateral [1] 17 (11)
Total Derivative Assets and Derivative Liabilities 62 33
Derivative Liabilities 1,055 384
Netting Adjustments and Cash Collateral-Derivative Liability [1] (1,055) (384)
Derivative Assets and Derivative Liabilities 0 0
Cash collateral posted and related accrued interest 1,082 378
Cash collateral received and related accrued interest 9 5
Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivatives, Notional Amount 46,837 39,622
Derivative Assets 24 31
Derivative Liabilities 1,011 370
Designated as Hedging Instrument | Interest rate swaps    
Derivatives, Fair Value [Line Items]    
Derivatives, Notional Amount 46,837 39,622
Derivative Assets 24 31
Derivative Liabilities 1,011 370
Not Designated as Hedging Instrument, Economic Hedge | Interest rate swaps    
Derivatives, Fair Value [Line Items]    
Derivatives, Notional Amount 70,963 60,424
Derivative Assets 18 13
Derivative Liabilities 44 14
Not Designated as Hedging Instrument, Economic Hedge | Interest rate caps and floors    
Derivatives, Fair Value [Line Items]    
Derivatives, Notional Amount 980 980
Derivative Assets 0 0
Derivative Liabilities 0 0
Not Designated as Hedging Instrument    
Derivatives, Fair Value [Line Items]    
Derivatives, Notional Amount 72,030 61,450
Derivative Assets 21 13
Derivative Liabilities 44 14
Mortgages | Not Designated as Hedging Instrument | Mortgage delivery commitments    
Derivatives, Fair Value [Line Items]    
Derivatives, Notional Amount 87 46
Derivative Assets 3 0
Derivative Liabilities $ 0 $ 0
[1]
Amounts represent the application of the netting requirements that allow the Bank to settle positive and negative positions, and also cash collateral and related accrued interest held or placed with the same clearing agents and/or counterparty. Cash collateral posted and related accrued interest was $1,082 and $378 at March 31, 2020, and December 31, 2019, respectively. Cash collateral received and related accrued interest was $9 and $5 at March 31, 2020, and December 31, 2019, respectively.