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Mortgage Loans Held for Portfolio (Tables)
 6 Months Ended
Jun. 30, 2019
Receivables [Abstract]  
Mortgage Loans Held for Portfolio

The following table presents information on mortgage loans held for portfolio by contractual maturity at the time of purchase.
 
 
As of June 30, 2019
 
As of December 31, 2018
Medium-term (15 years or less)
 
$
6

 
$
8

Long-term (greater than 15 years)
 
323

 
353

Total unpaid principal balance
 
329

 
361

Premiums
 
1

 
1

Discounts
 
(1
)
 
(1
)
Total
 
$
329

 
$
361




The following table presents the unpaid principal balance of mortgage loans held for portfolio by collateral or guarantee type.
 
 
As of June 30, 2019
 
As of December 31, 2018
Conventional mortgage loans
 
$
308

 
$
338

Government-guaranteed or insured mortgage loans
 
21

 
23

Total unpaid principal balance
 
$
329

 
$
361