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Securities (Tables)
 9 Months Ended
Sep. 30, 2017
Investments, Debt and Equity Securities [Abstract]  
Amortized Cost and Fair Value of the Securities Available-for-Sale and Held-to-Maturity
Our securities available-for-sale and securities held-to-maturity portfolios consisted of the following:
September 30, 2017
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(in millions)
Securities available-for-sale:
 
 
 
 
 
 
 
U.S. Treasury
$
16,069

 
$
147

 
$
(331
)
 
$
15,885

U.S. Government sponsored enterprises:
 
 
 
 
 
 
 
Mortgage-backed securities
3,384

 
5

 
(64
)
 
3,325

Collateralized mortgage obligations
648

 
—

 
(24
)
 
624

Direct agency obligations
3,356

 
99

 
(1
)
 
3,454

U.S. Government agency issued or guaranteed:
 
 
 
 
 
 
 
Mortgage-backed securities
5,430

 
9

 
(64
)
 
5,375

Collateralized mortgage obligations
999

 
2

 
(12
)
 
989

Direct agency obligations
423

 
11

 
—

 
434

Asset-backed securities collateralized by:
 
 
 
 
 
 
 
Home equity
58

 
—

 
(3
)
 
55

Other
507

 
2

 
—

 
509

Foreign debt securities(1)
890

 
—

 
(1
)
 
889

Equity securities
159

 
—

 
(5
)
 
154

Total available-for-sale securities
$
31,923

 
$
275

 
$
(505
)
 
$
31,693

Securities held-to-maturity:
 
 
 
 
 
 
 
U.S. Government sponsored enterprises:
 
 
 
 
 
 
 
Mortgage-backed securities
$
2,186

 
$
17

 
$
(4
)
 
$
2,199

Collateralized mortgage obligations
1,351

 
49

 
(10
)
 
1,390

U.S. Government agency issued or guaranteed:
 
 
 
 
 
 
 
Mortgage-backed securities
2,603

 
11

 
(6
)
 
2,608

Collateralized mortgage obligations
8,203

 
31

 
(49
)
 
8,185

Obligations of U.S. states and political subdivisions
14

 
1

 
—

 
15

Asset-backed securities collateralized by residential mortgages
4

 
—

 
—

 
4

Total held-to-maturity securities
$
14,361

 
$
109

 
$
(69
)
 
$
14,401

December 31, 2016
Amortized
Cost
 
Unrealized
Gains
 
Unrealized
Losses
 
Fair
Value
 
(in millions)
Securities available-for-sale:
 
 
 
 
 
 
 
U.S. Treasury
$
21,366

 
$
102

 
$
(559
)
 
$
20,909

U.S. Government sponsored enterprises:
 
 
 
 
 
 
 
Mortgage-backed securities
4,535

 
4

 
(122
)
 
4,417

Collateralized mortgage obligations
2,139

 
—

 
(36
)
 
2,103

Direct agency obligations
3,709

 
118

 
(10
)
 
3,817

U.S. Government agency issued or guaranteed:
 
 
 
 
 
 
 
Mortgage-backed securities
3,102

 
2

 
(58
)
 
3,046

Collateralized mortgage obligations
1,370

 
2

 
(15
)
 
1,357

Direct agency obligations
423

 
1

 
(4
)
 
420

Asset-backed securities collateralized by:
 
 
 
 
 
 
 
Home equity
69

 
—

 
(8
)
 
61

Other
108

 
—

 
(3
)
 
105

Foreign debt securities(1)
522

 
—

 
(1
)
 
521

Equity securities
159

 
—

 
(5
)
 
154

Total available-for-sale securities
$
37,502

 
$
229

 
$
(821
)
 
$
36,910

Securities held-to-maturity:
 
 
 
 
 
 
 
U.S. Government sponsored enterprises:
 
 
 
 
 
 
 
Mortgage-backed securities
$
2,465

 
$
11

 
$
(9
)
 
$
2,467

Collateralized mortgage obligations
1,591

 
59

 
(12
)
 
1,638

U.S. Government agency issued or guaranteed:
 
 
 
 
 
 
 
Mortgage-backed securities
2,557

 
11

 
(10
)
 
2,558

Collateralized mortgage obligations
6,176

 
34

 
(56
)
 
6,154

Obligations of U.S. states and political subdivisions
15

 
1

 
—

 
16

Asset-backed securities collateralized by residential mortgages
5

 
—

 
—

 
5

Total held-to-maturity securities
$
12,809

 
$
116

 
$
(87
)
 
$
12,838

 
(1) 
Foreign debt securities represent public sector entity, bank or corporate debt.
Gross Unrealized Losses and Related Fair Values
The following table summarizes gross unrealized losses and related fair values at September 30, 2017 and December 31, 2016 classified as to the length of time the losses have existed:
 
One Year or Less
 
Greater Than One Year
September 30, 2017
Number
of
Securities
 
Gross
Unrealized
Losses
 
Aggregate
Fair Value
of Investment
 
Number
of
Securities
 
Gross
Unrealized
Losses
 
Aggregate
Fair Value
of Investment
 
(dollars are in millions)
Securities available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
28

 
$
(214
)
 
$
7,433

 
29

 
$
(117
)
 
$
3,675

U.S. Government sponsored enterprises
84

 
(80
)
 
3,291

 
15

 
(9
)
 
259

U.S. Government agency issued or guaranteed
42

 
(70
)
 
1,858

 
6

 
(6
)
 
73

Asset-backed securities
—

 
—

 
—

 
5

 
(3
)
 
54

Foreign debt securities
8

 
—

 
672

 
1

 
(1
)
 
168

Equity securities
—

 
—

 
—

 
1

 
(5
)
 
154

Securities available-for-sale
162

 
$
(364
)
 
$
13,254

 
57

 
$
(141
)
 
$
4,383

Securities held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government sponsored enterprises
253

 
$
(13
)
 
$
1,156

 
51

 
$
(1
)
 
$
16

U.S. Government agency issued or guaranteed
125

 
(43
)
 
5,052

 
467

 
(12
)
 
776

Obligations of U.S. states and political subdivisions
—

 
—

 
—

 
2

 
—

 
—

Securities held-to-maturity
378

 
$
(56
)
 
$
6,208

 
520

 
$
(13
)

$
792

 
One Year or Less
 
Greater Than One Year
December 31, 2016
Number
of
Securities
 
Gross
Unrealized
Losses
 
Aggregate
Fair Value
of Investment
 
Number
of
Securities
 
Gross
Unrealized
Losses
 
Aggregate
Fair Value
of Investment
 
(dollars are in millions)
Securities available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
40

 
$
(378
)
 
$
13,707

 
32

 
$
(181
)
 
$
3,908

U.S. Government sponsored enterprises
316

 
(155
)
 
6,474

 
18

 
(13
)
 
427

U.S. Government agency issued or guaranteed
57

 
(66
)
 
3,941

 
7

 
(11
)
 
252

Asset-backed securities
—

 
—

 
—

 
8

 
(11
)
 
166

Foreign debt securities
7

 
—

 
343

 
1

 
(1
)
 
178

Equity securities
1

 
(5
)
 
154

 
—

 
—

 
—

Securities available-for-sale
421

 
$
(604
)
 
$
24,619

 
66

 
$
(217
)

$
4,931

Securities held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
U.S. Government sponsored enterprises
434

 
$
(21
)
 
$
2,013

 
45

 
$
—

 
$
21

U.S. Government agency issued or guaranteed
179

 
(65
)
 
4,734

 
503

 
(1
)
 
112

Obligations of U.S. states and political subdivisions
1

 
—

 
—

 
3

 
—

 
—

Securities held-to-maturity
614

 
$
(86
)
 
$
6,747

 
551

 
$
(1
)
 
$
133
Realized Gains and Losses on Investment Securities Transactions Attributable to Available-for-Sale Securities
The following table summarizes realized gains and losses on investment securities transactions attributable to available-for-sale securities:

Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Gross realized gains
$
9

 
$
25

 
$
42

 
$
112

Gross realized losses
(4
)
 
(9
)
 
(13
)
 
(31
)
Net realized gains
$
5

 
$
16

 
$
29

 
$
81
Distribution of Maturities of Debt Securities with the Approximate Yield of the Portfolio
The table below also reflects the distribution of maturities of debt securities held at September 30, 2017, together with the approximate taxable equivalent yield of the portfolio. The yields shown are calculated by dividing annualized interest income, including the accretion of discounts and the amortization of premiums, by the amortized cost of securities outstanding at September 30, 2017. Yields on tax-exempt obligations have been computed on a taxable equivalent basis using applicable statutory tax rates.
 
Within
One Year
 
After One
But Within
Five Years
 
After Five
But Within
Ten Years
 
After Ten
Years
Taxable Equivalent Basis
Amount
 
Yield
 
Amount
 
Yield
 
Amount
 
Yield
 
Amount
 
Yield
 
(dollars are in millions)
Available-for-sale:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Treasury
$
—

 
—
%
 
$
3,215

 
2.12
%
 
$
8,893

 
1.97
%
 
$
3,961

 
2.84
%
U.S. Government sponsored enterprises
99

 
3.26

 
2,921

 
3.00

 
1,502

 
2.52

 
2,866

 
2.70

U.S. Government agency issued or guaranteed
1

 
3.49

 
183

 
2.56

 
20

 
3.91

 
6,648

 
2.57

Asset-backed securities
400

 
2.56

 
—

 
—

 
—

 
—

 
165

 
3.85

Foreign debt securities
602

 
.00

 
288

 
1.18

 
—

 
—

 
—

 
—

Total amortized cost
$
1,102

 
1.23
%
 
$
6,607

 
2.48
%
 
$
10,415

 
2.06
%
 
$
13,640

 
2.69
%
Total fair value
$
1,103

 
 
 
$
6,727

 
 
 
$
10,233

 
 
 
$
13,476

 
 
Held-to-maturity:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
U.S. Government sponsored enterprises
$
—

 
—
%
 
$
310

 
2.36
%
 
$
339

 
2.77
%
 
$
2,888

 
2.86
%
U.S. Government agency issued or guaranteed
—

 
—

 
26

 
3.78

 
29

 
2.47

 
10,751

 
2.35

Obligations of U.S. states and political subdivisions
2

 
4.17

 
4

 
3.51

 
6

 
4.15

 
2

 
4.16

Asset-backed securities
—

 
—

 
—

 
—

 
—

 
—

 
4

 
7.11

Total amortized cost
$
2

 
4.17
%
 
$
340

 
2.48
%
 
$
374

 
2.77
%
 
$
13,645

 
2.46
%
Total fair value
$
2

 
 
 
$
342

 
 
 
$
379

 
 
 
$
13,678