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Commitments and Contingencies (Tables)
 6 Months Ended
Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract]  
Summary of the activity in repurchase and foreclosure-related reserves
A summary of the activity in repurchase and foreclosure-related reserves is as follows:
 
Six Months Ended
June 30,
 
2018
 
2017
 
(In millions)
Balance, beginning of period
$
40

 
$
73

Realized losses
(4
)
 
(13
)
Increase (decrease) in reserves due to:
 

 
 

Changes in assumptions
(1
)
 
2

New loan sales
—

 
1

Balance, end of period
$
35

 
$
63


Repurchase and foreclosure-related reserves consist of the following:
 
June 30,
2018
 
December 31,
2017
 
(In millions)
Loan repurchase and indemnification liability
$
27

 
$
29

Adjustment to value for real estate owned
6

 
9

Allowance for probable foreclosure losses
2

 
2

Total
$
35

 
$
40