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Investment Securities
6 Months Ended
Jun. 30, 2014
Investments, Debt and Equity Securities [Abstract]  
Investment Securities
Investment Securities
The following table presents the amortized cost and fair value, and associated unrealized gains and losses, of investment securities as of the dates indicated:
 
June 30, 2014
 
December 31, 2013
 
Amortized
Cost
 
Gross
Unrealized
 
Fair
Value
 
Amortized
Cost
 
Gross
Unrealized
 
Fair
Value
(In millions)
Gains
 
Losses
 
Gains
 
Losses
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and federal agencies:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Direct obligations
$
3,403

 
$
33

 
$
1

 
$
3,435

 
$
702

 
$
9

 
$
2

 
$
709

Mortgage-backed securities
22,067

 
235

 
163

 
22,139

 
23,744

 
211

 
392

 
23,563

Asset-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Student loans(1)
13,985

 
135

 
158

 
13,962

 
14,718

 
92

 
268

 
14,542

Credit cards
6,580

 
20

 
34

 
6,566

 
8,230

 
21

 
41

 
8,210

Sub-prime
1,172

 
3

 
74

 
1,101

 
1,291

 
3

 
91

 
1,203

Other
4,523

 
126

 
14

 
4,635

 
4,949

 
138

 
23

 
5,064

Total asset-backed securities
26,260

 
284

 
280

 
26,264

 
29,188

 
254

 
423

 
29,019

Non-U.S. debt securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
11,231

 
207

 
3

 
11,435

 
10,808

 
230

 
9

 
11,029

Asset-backed securities
4,181

 
20

 
1

 
4,200

 
5,369

 
23

 
2

 
5,390

Government securities
3,819

 
4

 

 
3,823

 
3,759

 
2

 

 
3,761

Other
5,699

 
66

 
8

 
5,757

 
4,679

 
59

 
11

 
4,727

Total non-U.S. debt securities
24,930

 
297

 
12

 
25,215

 
24,615

 
314

 
22

 
24,907

State and political subdivisions
10,400

 
289

 
72

 
10,617

 
10,301

 
160

 
198

 
10,263

Collateralized mortgage obligations
5,321

 
83

 
30

 
5,374

 
5,275

 
70

 
76

 
5,269

Other U.S. debt securities
4,706

 
145

 
9

 
4,842

 
4,876

 
138

 
34

 
4,980

U.S. equity securities
29

 
8

 

 
37

 
28

 
6

 

 
34

Non-U.S. equity securities
1

 

 

 
1

 
1

 

 

 
1

U.S. money-market mutual funds
615

 

 

 
615

 
422

 

 

 
422

Non-U.S. money-market mutual funds
7

 

 

 
7

 
7

 

 

 
7

Total
$
97,739

 
$
1,374

 
$
567

 
$
98,546

 
$
99,159

 
$
1,162

 
$
1,147

 
$
99,174

Held to maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and federal agencies:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Direct obligations
$
5,119

 
$

 
$
237

 
$
4,882

 
$
5,041

 
$

 
$
448

 
$
4,593

Mortgage-backed securities
74

 
5

 

 
79

 
91

 
6

 

 
97

Asset-backed securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Student loans(1)
1,900

 
6

 
1

 
1,905

 
1,627

 

 
10

 
1,617

Credit cards
897

 
3

 

 
900

 
762

 
1

 

 
763

Other
692

 
3

 
1

 
694

 
782

 
1

 
2

 
781

Total asset-backed securities
3,489

 
12

 
2

 
3,499

 
3,171

 
2

 
12

 
3,161

Non-U.S. debt securities:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
4,274

 
200

 
21

 
4,453

 
4,211

 
150

 
48

 
4,313

Asset-backed securities
2,898

 
18

 

 
2,916

 
2,202

 
19

 

 
2,221

Government securities
2

 

 

 
2

 
2

 

 

 
2

Other
245

 

 
1

 
244

 
192

 

 

 
192

Total non-U.S. debt securities
7,419

 
218

 
22

 
7,615

 
6,607

 
169

 
48

 
6,728

State and political subdivisions
15

 

 

 
15

 
24

 
1

 

 
25

Collateralized mortgage obligations
2,641

 
151

 
18

 
2,774

 
2,806

 
176

 
26

 
2,956

Total
$
18,757

 
$
386

 
$
279

 
$
18,864

 
$
17,740

 
$
354

 
$
534

 
$
17,560

 
 
 
 
(1) Substantially composed of securities guaranteed by the federal government with respect to at least 97% of defaulted principal and
accrued interest on the underlying loans.
Aggregate investment securities with carrying values of $45.99 billion and $46.99 billion as of June 30, 2014 and December 31, 2013, respectively, were designated as pledged for public and trust deposits, short-term borrowings and for other purposes as provided by law.

The following tables present the aggregate fair values of investment securities that have been in a continuous unrealized loss position for less than 12 months, and those that have been in a continuous unrealized loss position for 12 months or longer, as of the dates indicated:
 
Less than 12 months
 
12 months or longer
 
Total
June 30, 2014
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
(In millions)
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and federal agencies:
 
 
 
 
 
 
 
 
 
 
 
Direct obligations
$

 
$

 
$
127

 
$
1

 
$
127

 
$
1

Mortgage-backed securities
2,484

 
11

 
7,865

 
152

 
10,349

 
163

Asset-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Student loans
440

 
4

 
6,901

 
154

 
7,341

 
158

Credit cards
1,268

 
2

 
1,664

 
32

 
2,932

 
34

Sub-prime

 

 
1,046

 
74

 
1,046

 
74

Other
1,533

 
7

 
360

 
7

 
1,893

 
14

Total asset-backed securities
3,241

 
13

 
9,971

 
267

 
13,212

 
280

Non-U.S. debt securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
580

 
1

 
215

 
2

 
795

 
3

Asset-backed securities
501

 
1

 

 

 
501

 
1

Other
1,992

 
3

 
295

 
5

 
2,287

 
8

Total non-U.S. debt securities
3,073

 
5

 
510

 
7

 
3,583

 
12

State and political subdivisions
308

 
3

 
2,263

 
69

 
2,571

 
72

Collateralized mortgage obligations
309

 
2

 
863

 
28

 
1,172

 
30

Other U.S. debt securities

 

 
405

 
9

 
405

 
9

Total
$
9,415

 
$
34

 
$
22,004

 
$
533

 
$
31,419

 
$
567

Held to maturity:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and federal agencies:
 
 
 
 
 
 
 
 
 
 
 
Direct obligations
$

 
$

 
$
4,765

 
$
237

 
$
4,765

 
$
237

Asset-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Student loans

 

 
160

 
1

 
160

 
1

Other
83

 
1

 

 

 
83

 
1

Total asset-backed securities
83

 
1

 
160

 
1

 
243

 
2

Non-U.S. mortgage-backed securities
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
460

 
1

 
732

 
20

 
1,192

 
21

Other
54

 
1

 

 

 
54

 
1

Total non-U.S. debt securities
514

 
2

 
732

 
20

 
1,246

 
22

Collateralized mortgage obligations
343

 
5

 
631

 
13

 
974

 
18

Total
$
940

 
$
8

 
$
6,288

 
$
271

 
$
7,228

 
$
279


 
Less than 12 months
 
12 months or longer
 
Total
December 31, 2013
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
 
Fair
Value
 
Gross
Unrealized
Losses
(In millions)
 
 
 
 
 
Available for sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and federal agencies:
 
 
 
 
 
 
 
 
 
 
 
Direct obligations
$
182

 
$
1

 
$
113

 
$
1

 
$
295

 
$
2

Mortgage-backed securities
10,562

 
316

 
2,389

 
76

 
12,951

 
392

Asset-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Student loans
1,930

 
16

 
7,252

 
252

 
9,182

 
268

Credit cards
3,714

 
30

 
161

 
11

 
3,875

 
41

Sub-prime

 

 
1,150

 
91

 
1,150

 
91

Other
1,896

 
12

 
439

 
11

 
2,335

 
23

Total asset-backed securities
7,540

 
58

 
9,002

 
365

 
16,542

 
423

Non-U.S. debt securities:
 
 
 
 
 
 
 
 
 
 
 
Mortgage-backed securities
868

 
2

 
258

 
7

 
1,126

 
9

Asset-backed securities
551

 
1

 
16

 
1

 
567

 
2

Other
1,655

 
9

 
150

 
2

 
1,805

 
11

Total non-U.S. debt securities
3,074

 
12

 
424

 
10

 
3,498

 
22

State and political subdivisions
3,242

 
113

 
1,268

 
85

 
4,510

 
198

Collateralized mortgage obligations
1,581

 
55

 
510

 
21

 
2,091

 
76

Other U.S. debt securities
1,039

 
25

 
58

 
9

 
1,097

 
34

Total
$
27,220

 
$
580

 
$
13,764

 
$
567

 
$
40,984

 
$
1,147

Held to maturity:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury and federal agencies:
 
 
 
 
 
 
 
 
 
 
 
Direct obligations
$
4,571

 
$
448

 
$

 
$

 
$
4,571

 
$
448

Asset-backed securities:
 
 
 
 
 
 
 
 
 
 
 
Student Loans
1,352

 
10

 

 

 
1,352

 
10

Other
297

 
1

 
29

 
1

 
326

 
2

Total asset-backed securities
1,649

 
11

 
29

 
1

 
1,678

 
12

Non-U.S. mortgage-backed securities
834

 
3

 
878

 
45

 
1,712

 
48

Collateralized mortgage obligations
759

 
18

 
161

 
8

 
920

 
26

Total
$
7,813

 
$
480

 
$
1,068

 
$
54

 
$
8,881

 
$
534



The following table presents contractual maturities of debt investment securities as of June 30, 2014:
(In millions)
Under 1
Year
 
1 to 5
Years
 
6 to 10
Years
 
Over 10
Years
Available for sale:
 
 
 
 
 
 
 
U.S. Treasury and federal agencies:
 
 
 
 
 
 
 
Direct obligations
$
2

 
$
783

 
$
2,079

 
$
571

Mortgage-backed securities
197

 
2,295

 
5,141

 
14,506

Asset-backed securities:
 
 
 
 
 
 
 
Student loans
378

 
6,718

 
4,219

 
2,647

Credit cards
1,650

 
3,261

 
1,655

 

Sub-prime
7

 
19

 
1

 
1,074

Other
506

 
1,224

 
1,187

 
1,718

Total asset-backed securities
2,541

 
11,222

 
7,062

 
5,439

Non-U.S. debt securities:
 
 
 
 
 
 
 
Mortgage-backed securities
2,055

 
5,053

 
403

 
3,924

Asset-backed securities
333

 
3,176

 
564

 
127

Government securities
2,233

 
1,590

 

 

Other
2,038

 
2,655

 
1,064

 

Total non-U.S. debt securities
6,659

 
12,474

 
2,031

 
4,051

State and political subdivisions
670

 
3,032

 
4,321

 
2,594

Collateralized mortgage obligations
397

 
1,403

 
1,113

 
2,461

Other U.S. debt securities
637

 
3,485

 
685

 
35

Total
$
11,103

 
$
34,694

 
$
22,432

 
$
29,657

Held to maturity:
 
 
 
 
 
 
 
U.S. Treasury and federal agencies:
 
 
 
 
 
 
 
Direct obligations
$

 
$

 
$
5,000

 
$
119

Mortgage-backed securities

 
18

 
13

 
43

Asset-backed securities
 
 
 
 
 
 
 
Student loans
9

 
182

 
385

 
1,324

Credit cards

 
335

 
562

 

Other
24

 
441

 
222

 
5

Total asset-backed securities
33

 
958

 
1,169

 
1,329

Non-U.S. debt securities:
 
 
 
 
 
 
 
Mortgage-backed securities
87

 
1,320

 
181

 
2,686

Asset-backed securities
7

 
2,513

 
378

 

Government securities
2

 

 

 

Other
165

 
80

 

 

Total non-U.S. debt securities
261

 
3,913

 
559

 
2,686

State and political subdivisions
12

 
3

 

 

Collateralized mortgage obligations
487

 
697

 
510

 
947

Total
$
793

 
$
5,589

 
$
7,251

 
$
5,124


The maturities of asset-backed securities, mortgage-backed securities and collateralized mortgage obligations are based on expected principal payments.
The following tables present gross realized gains and gross realized losses from sales of available-for-sale securities and the components of net impairment losses, included in net gains and losses related to investment securities, for the periods indicated:
 
Three Months Ended June 30,
(In millions)
2014
 
2013
Gross realized gains from sales of available-for-sale securities
$
1

 
$
30

Gross realized losses from sales of available-for-sale securities
(1
)
 
(30
)
Net impairment losses:
 
 
 
Gross losses from other-than-temporary impairment

 
(6
)
Losses reclassified (from) to other comprehensive income
(2
)
 
(1
)
Net impairment losses(1)
(2
)
 
(7
)
Gains related to investment securities, net
$
(2
)
 
$
(7
)
(1) Net impairment losses, recognized in our consolidated statement of income, were composed of the following:
 
 
 
Impairment associated with expected credit losses
$
(1
)
 
$

Impairment associated with management's intent to sell impaired securities prior to recovery in value

 
(6
)
Impairment associated with adverse changes in timing of expected future cash flows
(1
)
 
(1
)
Net impairment losses
$
(2
)
 
$
(7
)


 
Six Months Ended June 30,
(In millions)
2014
 
2013
Gross realized gains from sales of available-for-sale securities
$
16

 
$
87

Gross realized losses from sales of available-for-sale securities
(1
)
 
(82
)
Net impairment losses:
 
 
 
Gross losses from other-than-temporary impairment
(1
)
 
(6
)
Losses reclassified (from) to other comprehensive income
(10
)
 
(4
)
Net impairment losses(1)
(11
)
 
(10
)
Gains related to investment securities, net
$
4

 
$
(5
)
(1) Net impairment losses, recognized in our consolidated statement of income, were composed of the following:
 
 
 
Impairment associated with expected credit losses
$
(10
)
 
$

Impairment associated with management's intent to sell impaired securities prior to recovery in value

 
(6
)
Impairment associated with adverse changes in timing of expected future cash flows
(1
)
 
(4
)
Net impairment losses
$
(11
)
 
$
(10
)
The following table presents activity with respect to net impairment losses for the periods indicated:
 
Six Months Ended June 30,
(In millions)
2014
 
2013
Beginning balance
$
122

 
$
124

Plus losses for which other-than-temporary impairment was not previously recognized

 
6

Plus losses for which other-than-temporary impairment was previously recognized
11

 
4

Less previously recognized losses related to securities sold or matured
(2
)
 
(9
)
Less losses related to securities intended or required to be sold
(6
)
 

Ending balance
$
125

 
$
125

Impairment:
We conduct periodic reviews of individual securities to assess whether other-than-temporary impairment exists. Impairment exists when the current fair value of an individual security is below its amortized cost basis. When the decline in the security's fair value is deemed to be other than temporary, the loss is recorded in our consolidated statement of income. In addition, for debt securities available for sale and held to maturity, impairment is recorded in our consolidated statement of income when management intends to sell (or may be required to sell) the securities before they recover in value, or when management expects the present value of cash flows expected to be collected from the securities to be less than the amortized cost of the impaired security (a credit loss).
 Our review of impaired securities generally includes:
the identification and evaluation of securities that have indications of potential other-than-temporary impairment, such as issuer-specific concerns, including deteriorating financial condition or bankruptcy;
the analysis of expected future cash flows of securities, based on quantitative and qualitative factors;
the analysis of the collectability of those future cash flows, including information about past events, current conditions and reasonable and supportable forecasts;
the analysis of the underlying collateral for mortgage- and asset-backed securities;
the analysis of individual impaired securities, including consideration of the length of time the security has been in an unrealized loss position, the anticipated recovery period, and the magnitude of the overall price decline;
discussion and evaluation of factors or triggers that could cause individual securities to be deemed other-than- temporarily impaired and those that would not support other-than-temporary impairment; and
documentation of the results of these analyses.
Factors considered in determining whether impairment is other than temporary include:
certain macroeconomic drivers;
certain industry-specific drivers;
the length of time the security has been impaired;
the severity of the impairment;
the cause of the impairment and the financial condition and near-term prospects of the issuer;
activity in the market with respect to the issuer's securities, which may indicate adverse credit conditions; and
our intention not to sell, and the likelihood that we will not be required to sell, the security for a period of time sufficient to allow for its recovery in value.
Substantially all of our investment securities portfolio is composed of debt securities. A critical component of our assessment of other-than-temporary impairment of these debt securities is the identification of credit-impaired securities for which management does not expect to receive cash flows sufficient to recover the entire amortized cost basis of the security.
Debt securities that are not deemed to be credit-impaired are subject to additional management analysis to assess whether management intends to sell, or, more likely than not, would be required to sell, the security before the expected recovery to its amortized cost basis.
The following provides a description of our process for the identification and assessment of other-than-temporary impairment, as well as information about other-than-temporary impairment recorded in the three and six months ended June 30, 2014 and 2013 and changes in period-end unrealized losses, for major security types.
U.S. Agency Securities
Our portfolio of U.S. agency direct obligations and mortgage-backed securities receives the implicit or explicit backing of the U.S. government in conjunction with specified financial support of the U.S. Treasury. We recorded no other-than-temporary impairment on these securities in the three and six months ended June 30, 2014 or 2013. The decline in the unrealized losses on these securities as of June 30, 2014 compared to December 31, 2013 was primarily attributable to narrowing spreads in the six months ended June 30, 2014.
Asset-Backed Securities - Student Loans
Asset-backed securities collateralized by student loans are primarily composed of securities collateralized by Federal Family Education Loan Program, or FFELP, loans. FFELP loans benefit from a federal government guarantee of at least 97% of defaulted principal and accrued interest, with additional credit support provided in the form of over-collateralization, subordination and excess spread, which collectively total in excess of 100%. Accordingly, the vast majority of FFELP loan-backed securities are protected from traditional consumer credit risk.
We recorded no other-than-temporary impairment on these securities in the three and six months ended June 30, 2014 or 2013. The gross unrealized losses in our FFELP loan-backed securities portfolio as of June 30, 2014 were primarily attributable to the lower spreads on these securities relative to those associated with more current issuances. The decline in the unrealized losses on these securities as of June 30, 2014 compared to December 31, 2013 was primarily attributable to narrowing spreads in the six months ended June 30, 2014.
Our assessment of other-than-temporary impairment of these securities considers, among many other factors, the strength of the U.S. government guarantee, the performance of the underlying collateral, and the remaining average term of the FFELP loan-backed securities portfolio, which was approximately 4.7 years as of June 30, 2014.
Our total exposure to private student loan-backed securities was less than $800 million as of June 30, 2014. Our assessment of other-than-temporary impairment of private student loan-backed securities considers, among other factors, the impact of high unemployment rates on the collateral performance of private student loans. We recorded no other-than-temporary impairment on these securities in the three and six months ended June 30, 2014 or 2013.
Non-U.S. Mortgage- and Asset-Backed Securities
Non-U.S. mortgage- and asset-backed securities are primarily composed of U.K., Australian and Dutch securities collateralized by residential mortgages and German securities collateralized by automobile loans and leases. Our assessment of impairment with respect to these securities considers the location of the underlying collateral, collateral enhancement and structural features, expected credit losses under base-case and stressed conditions and the macroeconomic outlook for the country in which the collateral is located, including housing prices and unemployment. Where appropriate, any potential loss after consideration of the above-referenced factors is further evaluated to determine whether any other-than-temporary impairment exists.
In the three and six months ended June 30, 2014, we recorded other-than-temporary impairment of $1 million on non-U.S. residential mortgage-backed securities in our consolidated statement of income, all associated with adverse changes in the timing of expected future cash flows from the securities. In the three and six months ended June 30, 2013, we recorded other-than-temporary impairment of $6 million on these securities in our consolidated statement of income, all associated with management's intent to sell the impaired security prior to its recovery in value. In addition, in the three and six months ended June 30, 2013, we recorded other-than-temporary impairment of $1 million and $4 million, respectively, on these securities in our consolidated statement of income, all associated with adverse changes in the timing of expected future cash flows from the securities.
Our aggregate exposure to Spain, Italy, Ireland and Portugal with respect to mortgage- and asset-backed securities totaled approximately $926 million as of June 30, 2014, composed of $197 million in Spain, $530 million in Italy, $119 million in Ireland and $80 million in Portugal. We had no direct sovereign debt exposure to any of these countries as of that date. As of June 30, 2014, these mortgage- and asset-backed securities had an aggregate pre-tax net unrealized gain of approximately $120 million, composed of gross unrealized gains of $122 million and gross unrealized losses of $2 million. We recorded the above-mentioned other-than-temporary impairment of $6 million on one of these securities in the three and six months ended June 30, 2013.
Our assessment of other-than-temporary impairment of these securities takes into account government intervention in the corresponding mortgage markets and assumes a conservative baseline macroeconomic environment for this region, factoring in slower economic growth and continued government austerity measures. Our baseline view assumes a recessionary period characterized by high unemployment and by additional housing price declines of between 2% and 15% across these four countries. Our evaluation of other-than-temporary impairment in our base case does not assume a disorderly sovereign-debt restructuring or a break-up of the Eurozone. In addition, we perform stress testing and sensitivity analysis in order to understand the impact of more severe assumptions on potential other-than-temporary impairment.
State and Political Subdivisions and Other U.S. Debt Securities
Our municipal securities portfolio primarily includes securities issued by U.S. states and their municipalities. A portion of this portfolio is held in connection with our tax-exempt investment program, more fully described in note 9. Our portfolio of other U.S. debt securities is primarily composed of securities issued by U.S. corporations. 
Our assessment of other-than-temporary impairment of these portfolios considers, among other factors, adverse conditions specifically related to the industry, geographic area or financial condition of the issuer; the structure of the security, including collateral, if any, and payment schedule; rating agency changes to the security's credit rating; the volatility of the fair value changes; and our intent and ability to hold the security until its recovery in value.  If the impairment of the security is credit-related, we estimate the future cash flows from the security, tailored to the security and considering the above-described factors, and any resulting impairment deemed to be other than temporary is recorded in our consolidated statement of income.  
We recorded no other-than-temporary impairment on these securities in the three and six months ended June 30, 2014 or 2013. The decline in the unrealized losses on these securities as of June 30, 2014 compared to December 31, 2013 was primarily attributable to the narrowing of spreads and U.S. Treasury rates in the six months ended June 30, 2014.
U.S. Non-Agency Residential Mortgage-Backed Securities
We assess other-than-temporary impairment of our portfolio of U.S. non-agency residential mortgage-backed securities using cash-flow models, tailored for each security, that estimate the future cash flows from the underlying mortgages, using the security-specific collateral and transaction structure. Estimates of future cash flows are subject to management judgment. The future cash flows and performance of our portfolio of U.S. non-agency residential mortgage-backed securities are a function of a number of factors, including, but not limited to, the condition of the U.S. economy, the condition of the U.S. residential mortgage markets, and the level of loan defaults, prepayments and loss severities. Management's estimates of future losses for each security also consider the underwriting and historical performance of each specific security, the underlying collateral type, vintage, borrower profile, third-party guarantees, current levels of subordination, geography and other factors.
We recorded no other-than-temporary impairment on these securities in the three and six months ended June 30, 2014 or 2013.
U.S. Non-Agency Commercial Mortgage-Backed Securities
With respect to our portfolio of U.S. non-agency commercial mortgage-backed securities, other-than-temporary impairment is assessed by considering a number of factors, including, but not limited to, the condition of the U.S. economy and the condition of the U.S. commercial real estate market, as well as capitalization rates. Management estimates of future losses for each security also consider the underlying collateral type, property location, vintage, debt-service coverage ratios, expected property income, servicer advances and estimated property values, as well as current levels of subordination. In the three and six months ended June 30, 2014, we recorded other-than-temporary impairment of $1 million and $10 million, respectively, on these securities in our consolidated statement of income, all associated with expected credit losses. We recorded no other-than-temporary impairment on these securities in the three and six months ended June 30, 2013.
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The estimates, assumptions and other risk factors utilized in our assessment of impairment as described above are used by management to identify securities which are subject to further analysis of potential credit losses. Additional analyses are performed using more stressful assumptions to further evaluate the sensitivity of losses relative to the above-described factors. However, since the assumptions are based on the unique characteristics of each security, management uses a range of estimates for prepayment speeds, default, and loss severity forecasts that reflect the collateral profile of the securities within each asset class. In addition, in measuring expected credit losses, the individual characteristics of each security are examined to determine whether any additional factors would increase or mitigate the expected loss. Once losses are determined, the timing of the loss will also affect the ultimate other-than-temporary impairment, since the loss is ultimately subject to a discount commensurate with the purchase yield of the security.
In the aggregate, we recorded other-than-temporary impairment of $2 million and $11 million in the three and six months ended June 30, 2014, respectively, compared to $7 million and $10 million in the three and six months ended June 30, 2013, respectively, as summarized below:

Three and six months ended June 30, 2014:
$1 million in both periods (non-U.S. mortgage-backed securities) resulted from adverse changes in the timing of expected future cash flows from certain of the securities; and
$1 million and $10 million (U.S. non-agency commercial mortgage-backed securities), respectively, were both associated with expected credit losses.
Three and six months ended June 30, 2013:
$6 million in both periods was associated with management's intent to sell the impaired security prior to its recovery in value; and
$1 million and $4 million (non-U.S. mortgage-backed securities), respectively, resulted from adverse changes in the timing of expected future cash flows from certain of the securities.
After a review of the investment portfolio, taking into consideration current economic conditions, adverse situations that might affect our ability to fully collect principal and interest, the timing of future payments, the credit quality and performance of the collateral underlying mortgage- and asset-backed securities and other relevant factors, and excluding other-than-temporary impairment recorded in the six months ended June 30, 2014, management considers the aggregate decline in fair value of the investment securities portfolio and the resulting gross pre-tax unrealized losses of $846 million as of June 30, 2014, related to 1,645 securities, to be temporary, and not the result of any material changes in the credit characteristics of the securities.