Consolidated Obligations (Consolidated Obligation Discount Notes) (Details) - USD ($) $ in Thousands		Sep. 30, 2020	Dec. 31, 2019
Short-term Debt [Line Items]
Discount Notes, Book value		$ 13,995,722	$ 23,141,362
Discount Notes, Weighted Average Interest Rate	[1]	0.16%	1.61%
Short-term Debt [Member]
Short-term Debt [Line Items]
Debt Instrument, Face Amount		$ 13,999,828	$ 23,211,524

[1] Represents an implied rate.