Consolidated Obligations (Consolidated Obligation Bonds Noncallable and Callable) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Schedule of Short-term and Long-term Debt [Line Items]
Long-term Debt, Gross	$ 41,457,900	$ 66,704,200
Non Callable [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Long-term Debt, Gross	36,784,650	61,597,600
Callable [Member]
Schedule of Short-term and Long-term Debt [Line Items]
Long-term Debt, Gross	$ 4,673,250	$ 5,106,600