Accumulated Other Comprehensive Income (Loss) (Tables)
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Equity [Abstract]    
Schedule of Accumulated Other Comprehensive Income (Loss)
The following table sets forth the components in accumulated other comprehensive income (loss) for each type of investment securities available-for-sale, investment securities held-to-maturity, and cash flow hedges:
 
Held-to-Maturity Securities
Available-for-Sale Securities
Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) Net of Tax
 
(Dollars in millions)
Accumulated other comprehensive income (loss) ("AOCI")
 
 
 
 
Balance at December 31, 2015, net of tax
$
5

$

$
(3
)
$
2

Net unrealized loss, net of tax

16

(44
)
(28
)
Reclassifications out of AOCI
(1
)
1

7

7

Balance at June 30, 2016, net of tax 
$
4

$
17

$
(40
)
$
(19
)
 
 
 
 
 
Balance at December 31, 2014, net of tax
$

$
8

$

$
8

Balance at June 30, 2015, net of tax
$

$
8

$

$
8

The following table sets forth the components in accumulated other comprehensive income (loss) for each type of investment securities available-for-sale, investment securities held-to-maturity, and cash flow hedges.
 
Held-to-Maturity Securities
 
Available-for-Sale Securities (1)
 
Cash Flow Hedges
 
Accumulated Other Comprehensive Income (Loss) Net of Tax
 
(Dollars in millions)
 
 
Accumulated other comprehensive income (loss) ("AOCI")
 
 
 
 
 
 
 
Balance at December 31, 2014, net of tax
$

 
$
8

 
$

 
$
8

Net unrealized loss, net of tax

 
(5
)
 
(5
)
 
(10
)
Reclassifications out of AOCI (1) 

 
2

 
2

 
4

Transfer of net unrealized loss from AFS to HTM
5

 
(5
)
 

 

Balance at December 31, 2015, net of tax 
$
5

 
$

 
$
(3
)
 
$
2

 
 
 
 
 
 
 
 
Balance at December 31, 2013, net of tax
$

 
$
(5
)
 
$

 
$
(5
)
Net unrealized gain, net of tax

 
13

 

 
13

Reclassifications out of AOCI (1) 

 

 

 

Balance at December 31, 2014, net of tax
$

 
$
8

 
$

 
$
8

 
 
 
 
 
 
 
 
Balance at December 31, 2012, net of tax
$

 
$
(2
)
 
$

 
$
(2
)
Net unrealized gain, net of tax

 
(3
)
 

 
(3
)
Reclassifications out of AOCI (1) 

 

 

 

Balance at December 31, 2013, net of tax
$

 
$
(5
)
 
$

 
$
(5
)
(1)
Reclassifications are reported in other noninterest income on the Consolidated Statement of Operations.