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Available-for-Sale and Held-to-Maturity Securities (Tables)
 3 Months Ended
Mar. 31, 2016
Investments, Debt and Equity Securities [Abstract]  
Investments Securities
The amortized cost and fair value of available-for-sale and held-to-maturity securities at March 31, 2016 and December 31, 2015 are shown in the following tables (dollars in millions):
 
Amortized
Cost
 
Gross
Unrealized /
Unrecognized
Gains
 
Gross
Unrealized /
Unrecognized
Losses
 
Fair Value
March 31, 2016:
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Agency mortgage-backed securities and CMOs
$
12,716

 
$
106

 
$
(63
)
 
$
12,759

Agency debentures
763

 
42

 
(1
)
 
804

U.S. Treasuries
290

 
7

 
(4
)
 
293

Agency debt securities
75

 
2

 
—

 
77

Municipal bonds
34

 
1

 
—

 
35

Corporate bonds
5

 
—

 
(1
)
 
4

Total debt securities
13,883

 
158

 
(69
)
 
13,972

Publicly traded equity securities(1)
33

 
—

 
—

 
33

Total available-for-sale securities
$
13,916

 
$
158

 
$
(69
)
 
$
14,005

Held-to-maturity securities:
 
 
 
 
 
 
 
Agency residential mortgage-backed securities and CMOs
$
12,016

 
$
330

 
$
(19
)
 
$
12,327

Agency debentures
127

 
1

 
—

 
128

Agency debt securities
2,815

 
91

 
—

 
2,906

Other non-agency debt securities
10

 
—

 
—

 
10

Total held-to-maturity securities
$
14,968

 
$
422

 
$
(19
)
 
$
15,371

 
 
 
 
 
 
 
 
December 31, 2015:

 
 
 
 
 

Available-for-sale securities:
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
Agency mortgage-backed securities and CMOs
$
11,888

 
$
41

 
$
(166
)
 
$
11,763

Agency debentures
551

 
18

 
(12
)
 
557

U.S. Treasuries
147

 
—

 
(4
)
 
143

Agency debt securities
55

 
—

 
—

 
55

Municipal bonds
35

 
—

 
—

 
35

Corporate bonds
5

 
—

 
(1
)
 
4

Total debt securities
12,681

 
59

 
(183
)
 
12,557

Publicly traded equity securities(1)
33

 
—

 
(1
)
 
32

Total available-for-sale securities
$
12,714

 
$
59

 
$
(184
)
 
$
12,589

Held-to-maturity securities:
 
 
 
 
 
 
 
Agency residential mortgage-backed securities and CMOs
$
10,353

 
$
149

 
$
(58
)
 
$
10,444

Agency debentures
127

 
—

 
(2
)
 
125

Agency debt securities
2,523

 
34

 
(13
)
 
2,544

Other non-agency debt securities
10

 
—

 
—

 
10

Total held-to-maturity securities
$
13,013

 
$
183

 
$
(73
)
 
$
13,123


(1)
Publicly traded equity securities consisted of investments in a mutual fund related to the Community Reinvestment Act.
Investments Classified by Contractual Maturity Date
The contractual maturities of all available-for-sale and held-to-maturity debt securities at March 31, 2016 are shown below (dollars in millions): 
 
Amortized Cost
 
Fair Value
Available-for-sale debt securities:
 
 
 
Due within one year
$
—

 
$
—

Due within one to five years
21

 
21

Due within five to ten years
2,952

 
2,998

Due after ten years
10,910

 
10,953

Total available-for-sale debt securities
$
13,883

 
$
13,972

Held-to-maturity debt securities:
 
 
 
Due within one year
$
43

 
$
43

Due within one to five years
1,294

 
1,353

Due within five to ten years
4,234

 
4,381

Due after ten years
9,397

 
9,594

Total held-to-maturity debt securities
$
14,968

 
$
15,371
Schedule of Unrealized Loss on Investments
The following tables show the fair value and unrealized or unrecognized losses on available-for-sale and held-to-maturity securities, aggregated by investment category, and the length of time that individual securities have been in a continuous unrealized or unrecognized loss position at March 31, 2016 and December 31, 2015 (dollars in millions):
 
Less than 12 Months
 
12 Months or More
 
Total
 
Fair Value
 
Unrealized /
Unrecognized
Losses
 
Fair Value
 
Unrealized /
Unrecognized
Losses
 
Fair Value
 
Unrealized /
Unrecognized
Losses
March 31, 2016:
 
 
 
 
 
 
 
 
 
 
 
Available-for-sale securities:
 
 
 
 
 
 
 
 
 
 
 
Debt securities:
 
 
 
 
 
 
 
 
 
 
 
Agency mortgage-backed securities and CMOs
$
3,315

 
$
(24
)
 
$
2,521

 
$
(39
)
 
$
5,836

 
$
(63
)
Agency debentures
149

 
(1
)
 
15

 
—

 
164

 
(1
)
U.S. Treasuries
139

 
(4
)
 
—

 
—

 
139

 
(4
)
Corporate bonds
—

 
—

 
4

 
(1
)
 
4

 
(1
)
Total temporarily impaired available-for-sale securities
$
3,603

 
$
(29
)
 
$
2,540

 
$
(40
)
 
$
6,143

 
$
(69
)
Held-to-maturity securities:
 
 
 
 
 
 
 
 
 
 
 
Agency mortgage-backed securities and CMOs
$
230

 
$
(2
)
 
$
1,353

 
$
(17
)
 
$
1,583

 
$
(19
)
Agency debt securities
20

 
—

 
—

 
—

 
20

 
—

Total temporarily impaired held-to-maturity securities
$
250

 
$
(2
)
 
$
1,353

 
$
(17
)
 
$
1,603

 
$
(19
)
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2015:

 

 

 

 

 

Available-for-sale securities:
 
 
 
 
 
 
 
 


 


Debt securities:
 
 
 
 
 
 
 
 
 
 
 
Agency mortgage-backed securities and CMOs
$
6,832

 
$
(88
)
 
$
2,496

 
$
(78
)
 
$
9,328

 
$
(166
)
Agency debentures
329

 
(12
)
 
9

 
—

 
338

 
(12
)
U.S. Treasuries
143

 
(4
)
 
—

 
—

 
143

 
(4
)
Agency debt securities
55

 
—

 
—

 
—

 
55

 
—

Municipal bonds
—

 
—

 
15

 
—

 
15

 
—

Corporate bonds
—

 
—

 
4

 
(1
)
 
4

 
(1
)
Publicly traded equity securities
32

 
(1
)
 
—

 
—

 
32

 
(1
)
Total temporarily impaired available-for-sale securities
$
7,391


$
(105
)

$
2,524


$
(79
)

$
9,915


$
(184
)
Held-to-maturity securities:
 
 
 
 
 
 
 
 
 
 
 
Agency mortgage-backed securities and CMOs
$
2,807

 
$
(25
)
 
$
1,495

 
$
(33
)
 
$
4,302

 
$
(58
)
Agency debentures
114

 
(2
)
 
—

 
—

 
114

 
(2
)
Agency debt securities
1,006

 
(10
)
 
134

 
(3
)
 
1,140

 
(13
)
Total temporarily impaired held-to-maturity securities
$
3,927

 
$
(37
)
 
$
1,629

 
$
(36
)
 
$
5,556

 
$
(73
)
Gains (Losses) on Loans and Investments
The detailed components of the gains (losses) on securities and other line item on the consolidated statement of income for the three months ended March 31, 2016 and 2015 are as follows (dollars in millions):
 
Three Months Ended March 31,
 
2016
 
2015
Hedge ineffectiveness
$
(2
)
 
$
(1
)
Gains on available-for-sale securities
15

 
10

Equity method investment income (loss) and other
(3
)
 
6

Gains (losses) on securities and other
$
10

 
$
15