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Advances (Interest Rate Payment Terms and Prepayment Fees) (Details) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Federal Home Loan Bank, Advances, Fixed Rate [Abstract]    
Fixed Rate, due within 1 year $ 15,327 $ 20,437
Fixed Rate, due after 1 year 21,337 19,727
Advances, Total Fixed Rate 36,664 40,164
Federal Home Loan Bank, Advances, Floating Rate [Abstract]    
Adjustable Rate, due within 1 year 17,024 21,848
Adjustable Rate, due after 1 year 11,400 11,483
Advances, Total Adjustable Rate 28,424 33,331
Total par value $ 65,088 $ 73,495