Advances Advances (Redemption Terms) (Details) - USD ($) $ in Millions		Jun. 30, 2019	Dec. 31, 2018
Advances [Abstract]
Overdrawn demand deposit accounts		$ 1	$ 33
Due in one year or less		64,245	72,300
Due after one year through two years		13,345	13,298
Due after two years through three years		4,912	5,403
Due after three years through four years		5,098	4,678
Due after four years through five years		4,470	3,997
Due after five years		8,911	8,705
Federal Home Loan Bank, Advances, Par Value		100,982	108,414
Deferred Prepayment Fees on Advances		(15)	(17)
Discount on AHP advances	[1]	(4)	(4)
Discount on EDGE advances	[2]	(2)	(2)
Hedging adjustments		815	71
Total Federal Home Loan Bank Advances		$ 101,776	$ 108,462

[1] The Affordable Housing Program

[2] The Economic Development and Growth Enhancement Program