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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2017
Guarantees [Abstract]  
Mortgage Loan Repurchase Losses [Table Text Block]
The following table summarizes the changes in the Company’s reserve for residential mortgage loan repurchases for the years ended December 31:
(Dollars in millions)
2017
 
2016
 
2015
Balance, beginning of period

$40

 

$57

 

$85

Repurchase provision/(benefit)
—

 
(17
)
 
(12
)
Charge-offs, net of recoveries
(1
)
 
—

 
(16
)
Balance, end of period

$39

 

$40

 

$57
Repurchased Mortgage Loan [Table Text Block]
The following table summarizes the carrying value of the Company's outstanding repurchased residential mortgage loans at December 31:
(Dollars in millions)
2017
 
2016
Outstanding repurchased residential mortgage loans:
Performing LHFI

$203

 

$230

Nonperforming LHFI
16

 
12

Total carrying value of outstanding repurchased residential mortgages

$219

 

$242