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Investment Securities (Tables)
 6 Months Ended
Jun. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Schedule of Trading and Available-for-sale Securities
As of June 30, 2017 and December 31, 2016, investment securities were comprised of the following:
 
Amortized
Cost
 
Gross
Unrealized
Gains
 
Gross
Unrealized
Losses
 
Fair Value
 
(Dollars in millions)
June 30, 2017
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
Agency - Commercial
$
522

 
$
1

 
$
(5
)
 
$
518

Agency - Residential
1,039

 
2

 
(12
)
 
1,029

Municipal obligations
37

 
—

 
—

 
37

Corporate debt obligations
30

 
—

 
—

 
30

Total available-for-sale securities (1)
$
1,628

 
$
3

 
$
(17
)
 
$
1,614

Held-to-maturity securities
 
 
 
 
 
 
 
Agency - Commercial
$
559

 
$
1

 
$
(5
)
 
$
555

Agency - Residential
455

 
1

 
(3
)
 
453

Total held-to-maturity securities (1)
$
1,014

 
$
2

 
$
(8
)
 
$
1,008

December 31, 2016
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
Agency - Commercial
$
551

 
$
2

 
$
(5
)
 
$
548

Agency - Residential
913

 
1

 
(16
)
 
898

Municipal obligations
34

 
—

 
—

 
34

Total available-for-sale securities (1)
$
1,498

 
$
3

 
$
(21
)
 
$
1,480

Held-to-maturity securities
 
 
 
 
 
 
 
Agency - Commercial
$
595

 
$
—

 
$
(6
)
 
$
589

Agency - Residential
498

 
1

 
(4
)
 
495

Total held-to-maturity securities (1)
$
1,093

 
$
1

 
$
(10
)
 
$
1,084


(1)
There were no securities of a single issuer, which are not governmental or government-sponsored, that exceeded 10 percent of stockholders’ equity at June 30, 2017 or December 31, 2016.
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value
The following table summarizes, by duration, the unrealized loss positions on investment securities: 
 
Unrealized Loss Position with
Duration 12 Months and Over
 
Unrealized Loss Position with
Duration Under 12 Months
 
Fair Value
 
Number of
Securities
 
Unrealized
Loss
 
Fair
Value
 
Number of
Securities
 
Unrealized
Loss
 
(Dollars in millions)
June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
 
 
 
 
Agency - Commercial
$
5

 
1

 
$
—

 
$
367

 
30

 
$
(5
)
Agency - Residential
—

 
—

 
—

 
611

 
49

 
(12
)
Municipal obligations
—

 
—

 
—

 
20

 
7

 
—

Corporate debt obligations
—

 
—

 
—

 
3

 
1
 
—

Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
Agency - Commercial
$
4

 
1

 
$
—

 
$
429

 
27

 
$
(5
)
Agency - Residential
—

 
—

 
—

 
356

 
44

 
(3
)
December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities
 
 
 
 
 
 
 
 
 
 
 
Agency - Commercial
$
6

 
1

 
$
—

 
$
345

 
29

 
$
(5
)
Agency - Residential
—

 
—

 
—

 
748

 
55

 
(16
)
Municipal obligations
—

 
—

 
—

 
17

 
8

 
—

Held-to-maturity securities
 
 
 
 
 
 
 
 
 
 
 
Agency - Commercial
$
—

 
—

 
$
—

 
$
528

 
34

 
$
(6
)
Agency - Residential
—

 
—

 
—

 
385

 
43

 
(4
)
Schedule of Available-for-sale Securities, by Contractual Maturity Date
The amortized cost and estimated fair value of securities are presented below by contractual maturity:
 
Investment Securities
Available-for-Sale
 
Investment Securities
Held-to-maturity
 
Amortized
Cost
 
Fair
Value
 
Weighted Average
Yield
 
Amortized
Cost
 
Fair
Value
 
Weighted Average
Yield
 
(Dollars in millions)
June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Due after one year through five years
$
16

 
$
16

 
3.39
%
 
$
—

 
$
—

 
—
%
Due after five years through 10 years
35

 
35

 
5.18
%
 
61

 
61

 
2.50
%
Due after 10 years
1,577

 
1,563

 
2.30
%
 
953

 
947

 
2.45
%
Total
$
1,628

 
$
1,614

 
 
 
$
1,014

 
$
1,008