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Affordable Housing Program (Tables)
 12 Months Ended
Dec. 31, 2019
Federal Home Loan Banks [Abstract]  
Activity in Affordable Housing Program Obligation [Table Text Block] As subsidies are disbursed, the AHP liability is reduced. The AHP liability was as follows:

 
2019

 
2018

 
2017

Balance, beginning of the period
$
182

 
$
204

 
$
205

AHP assessments
38

 
43

 
45

AHP voluntary contributions
2

 
3

 
7

AHP grant payments
(70
)
 
(68
)
 
(53
)
Balance, end of the period
$
152

 
$
182

 
$
204