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MORTGAGE BANKING (Tables)
 9 Months Ended
Sep. 30, 2015
Mortgage Banking [Abstract]  
Schedule of valuation allowance for impairment of recognized servicing assets
Changes related to MSRs were as follows:
 
As of and for the Nine Months Ended September 30,
(in millions)
2015

 
2014

MSRs:
 
 
 
Balance as of January 1

$184

 

$208

Amount capitalized
20

 
13

Amortization
(28
)
 
(32
)
Carrying amount before valuation allowance
176

 
189

Valuation allowance for servicing assets:
 
 
 
Balance as of January 1
18

 
23

Valuation recovery
(6
)
 
(8
)
Balance at end of period
12

 
15

Net carrying value of MSRs

$164

 

$174
Servicing asset at amortized cost
Changes related to MSRs were as follows:
 
As of and for the Nine Months Ended September 30,
(in millions)
2015

 
2014

MSRs:
 
 
 
Balance as of January 1

$184

 

$208

Amount capitalized
20

 
13

Amortization
(28
)
 
(32
)
Carrying amount before valuation allowance
176

 
189

Valuation allowance for servicing assets:
 
 
 
Balance as of January 1
18

 
23

Valuation recovery
(6
)
 
(8
)
Balance at end of period
12

 
15

Net carrying value of MSRs

$164

 

$174
Schedule of fair value assumptions used to estimate the value of Mortgage Servicing Rights
The key economic assumptions used to estimate the value of MSRs are presented in the following table:

(dollars in millions)
September 30, 2015
 
December 31, 2014
Fair value
$177
 
$179
Weighted average life (in years)
5.2
 
5.2
Weighted average constant prepayment rate
 12.3%
 
 12.4%
Weighted average discount rate
   9.8%
 
   9.8%
Schedule of fair value assumptions used to estimate the value of Mortgage Servicing Rights capitalized in current period
The key economic assumptions used in estimating the fair value of MSRs capitalized during the period were as follows:
 
Nine Months Ended September 30,
 
2015
 
2014
Weighted average life (in years)
5.7
 
5.7
Weighted average constant prepayment rate
 10.8%
 
 11.7%
Weighted average discount rate
9.7%
 
 10.3%
Schedule of the impact to fair value of an adverse change in key economic assumptions
(in millions)
September 30, 2015
 
December 31, 2014
Prepayment rate:
 
 
 
Decline in fair value from a 50 basis point decrease in interest rates

$6

 

$9

Decline in fair value from a 100 basis point decrease in interest rates

$12

 

$15

Weighted average discount rate:
 
 
 
Decline in fair value from a 50 basis point increase in weighted average discount rate

$3

 

$3

Decline in fair value from a 100 basis point increase in weighted average discount rate

$6

 

$6