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Guarantees (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
Year Ended December 31
(Dollars in millions)
2018
 
2017
 
2016
Balance, beginning of period

$39

 

$40

 

$57

Repurchase (benefit)/provision
(9
)
 
—

 
(17
)
Charge-offs, net of recoveries
(4
)
 
(1
)
 
—

Balance, end of period

$26

 

$39

 

$40
Repurchased Mortgage Loan [Table Text Block] The following table summarizes the carrying value of the Company’s outstanding repurchased residential mortgage loans:
(Dollars in millions)
December 31, 2018
 
December 31, 2017
Outstanding repurchased residential mortgage loans:
Performing LHFI

$183

 

$203

Nonperforming LHFI
16

 
16

Total carrying value of outstanding repurchased residential mortgages

$199

 

$219