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Representation and Warranty Reserve (Tables)
 6 Months Ended
Jun. 30, 2017
Representation and Warranty Reserve Disclosures [Abstract]  
Schedule of Representation and Warranty Reserve Activity
The following table shows the activity impacting the representation and warranty reserve:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2017
 
2016
 
2017
 
2016
 
(Dollars in millions)
Balance at beginning of period
$
23

 
$
40

 
$
27

 
$
40

Provision (benefit)
 
 
 
 
 
 
 
Gain on sale reduction for representation and warranty liability
1

 
1

 
2

 
3

Representation and warranty provision (benefit)
(3
)
 
(4
)
 
(7
)
 
(6
)
Total
(2
)
 
(3
)
 
(5
)
 
(3
)
(Charge-offs) recoveries, net
(1
)
 
(1
)
 
(2
)
 
(1
)
Balance at end of period
$
20

 
$
36

 
$
20

 
$
36