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Investments (Tables)
 9 Months Ended
Sep. 30, 2018
Investments, Debt and Equity Securities [Abstract]  
Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities And Related OTTI Recognized In AOCI
September 30, 2018
Amortized
Cost

 
Gross
Unrealized
Appreciation

 
Gross
Unrealized
Depreciation

 
Fair
Value

 
OTTI Recognized
in AOCI

(in millions of U.S. dollars)
 
 
 
 
Available for sale
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
4,137

 
$
13

 
$
(101
)
 
$
4,049

 
$
—

Foreign
21,280

 
374

 
(299
)
 
21,355

 
—

Corporate securities
24,905

 
248

 
(358
)
 
24,795

 
(6
)
Mortgage-backed securities
16,395

 
26

 
(523
)
 
15,898

 
(1
)
States, municipalities, and political subdivisions
11,920

 
42

 
(206
)
 
11,756

 
—

 
$
78,637

 
$
703

 
$
(1,487
)
 
$
77,853

 
$
(7
)
Held to maturity
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
1,112

 
$
6

 
$
(25
)
 
$
1,093

 
$
—

Foreign
1,601

 
10

 
(25
)
 
1,586

 
—

Corporate securities
2,658

 
11

 
(91
)
 
2,578

 
—

Mortgage-backed securities
2,574

 
4

 
(75
)
 
2,503

 
—

States, municipalities, and political subdivisions
5,618

 
10

 
(104
)
 
5,524

 
—

 
$
13,563

 
$
41

 
$
(320
)
 
$
13,284

 
$
—


December 31, 2017
Amortized
Cost

 
Gross
Unrealized
Appreciation

 
Gross
Unrealized
Depreciation

 
Fair
Value

 
OTTI Recognized
in AOCI

(in millions of U.S. dollars)
 
 
 
 
Available for sale
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
3,701

 
$
32

 
$
(35
)
 
$
3,698

 
$
—

Foreign
20,514

 
622

 
(106
)
 
21,030

 
(1
)
Corporate securities
23,453

 
638

 
(95
)
 
23,996

 
(4
)
Mortgage-backed securities
15,279

 
111

 
(100
)
 
15,290

 
(1
)
States, municipalities, and political subdivisions
14,888

 
125

 
(88
)
 
14,925

 
—

 
$
77,835

 
$
1,528

 
$
(424
)
 
$
78,939

 
$
(6
)
Held to maturity
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
908

 
$
12

 
$
(5
)
 
$
915

 
$
—

Foreign
1,738

 
27

 
(8
)
 
1,757

 
—

Corporate securities
3,159

 
67

 
(7
)
 
3,219

 
—

Mortgage-backed securities
2,724

 
23

 
(5
)
 
2,742

 
—

States, municipalities, and political subdivisions
5,806

 
50

 
(15
)
 
5,841

 
—

 
$
14,335

 
$
179

 
$
(40
)
 
$
14,474

 
$
—
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI
 
September 30, 2018
Amortized
Cost

 
Gross
Unrealized
Appreciation

 
Gross
Unrealized
Depreciation

 
Fair
Value

 
OTTI Recognized
in AOCI

(in millions of U.S. dollars)
 
 
 
 
Available for sale
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
4,137

 
$
13

 
$
(101
)
 
$
4,049

 
$
—

Foreign
21,280

 
374

 
(299
)
 
21,355

 
—

Corporate securities
24,905

 
248

 
(358
)
 
24,795

 
(6
)
Mortgage-backed securities
16,395

 
26

 
(523
)
 
15,898

 
(1
)
States, municipalities, and political subdivisions
11,920

 
42

 
(206
)
 
11,756

 
—

 
$
78,637

 
$
703

 
$
(1,487
)
 
$
77,853

 
$
(7
)
Held to maturity
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
1,112

 
$
6

 
$
(25
)
 
$
1,093

 
$
—

Foreign
1,601

 
10

 
(25
)
 
1,586

 
—

Corporate securities
2,658

 
11

 
(91
)
 
2,578

 
—

Mortgage-backed securities
2,574

 
4

 
(75
)
 
2,503

 
—

States, municipalities, and political subdivisions
5,618

 
10

 
(104
)
 
5,524

 
—

 
$
13,563

 
$
41

 
$
(320
)
 
$
13,284

 
$
—


December 31, 2017
Amortized
Cost

 
Gross
Unrealized
Appreciation

 
Gross
Unrealized
Depreciation

 
Fair
Value

 
OTTI Recognized
in AOCI

(in millions of U.S. dollars)
 
 
 
 
Available for sale
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
3,701

 
$
32

 
$
(35
)
 
$
3,698

 
$
—

Foreign
20,514

 
622

 
(106
)
 
21,030

 
(1
)
Corporate securities
23,453

 
638

 
(95
)
 
23,996

 
(4
)
Mortgage-backed securities
15,279

 
111

 
(100
)
 
15,290

 
(1
)
States, municipalities, and political subdivisions
14,888

 
125

 
(88
)
 
14,925

 
—

 
$
77,835

 
$
1,528

 
$
(424
)
 
$
78,939

 
$
(6
)
Held to maturity
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
908

 
$
12

 
$
(5
)
 
$
915

 
$
—

Foreign
1,738

 
27

 
(8
)
 
1,757

 
—

Corporate securities
3,159

 
67

 
(7
)
 
3,219

 
—

Mortgage-backed securities
2,724

 
23

 
(5
)
 
2,742

 
—

States, municipalities, and political subdivisions
5,806

 
50

 
(15
)
 
5,841

 
—

 
$
14,335

 
$
179

 
$
(40
)
 
$
14,474

 
$
—
Schedule Of Fixed Maturities By Contractual Maturity
The following table presents fixed maturities by contractual maturity:
 
 
 
September 30

 
 
 
December 31

 
 
 
2018

 
 
 
2017

(in millions of U.S. dollars)
Amortized Cost

 
Fair Value

 
Amortized Cost

 
Fair Value

Available for sale
 
 
 
 
 
 
 
Due in 1 year or less
$
3,736

 
$
3,742

 
$
3,164

 
$
3,182

Due after 1 year through 5 years
26,694

 
26,646

 
24,749

 
25,068

Due after 5 years through 10 years
23,638

 
23,325

 
25,388

 
25,704

Due after 10 years
8,174

 
8,242

 
9,255

 
9,695

 
62,242

 
61,955

 
62,556

 
63,649

Mortgage-backed securities
16,395

 
15,898

 
15,279

 
15,290

 
$
78,637

 
$
77,853

 
$
77,835

 
$
78,939

Held to maturity
 
 
 
 
 
 
 
Due in 1 year or less
$
567

 
$
569

 
$
743

 
$
746

Due after 1 year through 5 years
2,959

 
2,925

 
2,669

 
2,688

Due after 5 years through 10 years
4,507

 
4,400

 
4,744

 
4,756

Due after 10 years
2,956

 
2,887

 
3,455

 
3,542

 
10,989

 
10,781

 
11,611

 
11,732

Mortgage-backed securities
2,574

 
2,503

 
2,724

 
2,742

 
$
13,563

 
$
13,284

 
$
14,335

 
$
14,474
Schedule of Realized Gain (Loss)
The following table presents the components of Net realized gains (losses):
 
Three Months Ended
 
 
Nine Months Ended
 
 
September 30
 
 
September 30
 
(in millions of U.S. dollars)
2018

 
2017

 
2018

 
2017

Fixed maturities:
 
 
 
 
 
 
 
OTTI on fixed maturities, gross
$
(14
)
 
$
(5
)
 
$
(19
)
 
$
(16
)
OTTI on fixed maturities recognized in OCI (pre-tax)
3

 
—

 
3

 
1

OTTI on fixed maturities, net
(11
)
 
(5
)
 
(16
)
 
(15
)
Gross realized gains excluding OTTI
64

 
30

 
229

 
109

Gross realized losses excluding OTTI
(91
)
 
(19
)
 
(355
)
 
(77
)
Total fixed maturities
(38
)
 
6

 
(142
)
 
17

Equity securities:
 
 
 
 
 
 
 
OTTI on equity securities
—

 
(1
)
 
—

 
(9
)
Gross realized gains excluding OTTI
48

 
6

 
63

 
21

Gross realized losses excluding OTTI
(13
)
 
(1
)
 
(41
)
 
(2
)
Total equity securities
35

 
4

 
22

 
10

OTTI on other investments
—

 
(2
)
 
—

 
(11
)
Other investments
5

 
—

 
23

 
—

Foreign exchange gains (losses)
39

 
15

 
102

 
10

Investment and embedded derivative instruments
37

 
(14
)
 
78

 
(24
)
Fair value adjustments on insurance derivative
54

 
54

 
133

 
265

S&P put options and futures
(100
)
 
(57
)
 
(122
)
 
(169
)
Other derivative instruments
(8
)
 
(5
)
 
2

 
(4
)
Other
(5
)
 
(11
)
 
(61
)
 
(10
)
Net realized gains (losses)
$
19

 
$
(10
)
 
$
35

 
$
84
Schedule Of Roll-Forward Of Pre-Tax Credit Losses Related To Fixed Maturities For Which A Portion Of OTTI Was Recognized In OCI
The following table presents a roll-forward of pre-tax credit losses related to fixed maturities for which a portion of OTTI was recognized in OCI: 
 
Three Months Ended
 
 
Nine Months Ended
 
 
September 30
 
 
September 30
 
(in millions of U.S. dollars)
2018

 
2017

 
2018

 
2017

Balance of credit losses related to securities still held – beginning of period
$
16

 
$
29

 
$
22

 
$
35

Additions where no OTTI was previously recorded
6

 
2

 
7

 
3

Additions where an OTTI was previously recorded
2

 
1

 
2

 
2

Reductions for securities sold during the period
(3
)
 
(7
)
 
(10
)
 
(15
)
Balance of credit losses related to securities still held – end of period
$
21

 
$
25

 
$
21

 
$
25
Gain (Loss) on Securities [Table Text Block]
Effective January 1, 2018, we adopted new accounting guidance that requires any changes in fair value of equity securities and other investments that are accounted for under the cost-method to be recognized immediately in realized gains and losses in net income. As a result, beginning on January 1, 2018, realized gains and losses from these investments include both sales of securities and unrealized gains and losses as follows:

 
Three Months Ended
 
 
Nine Months Ended
 
 
September 30, 2018
 
 
September 30, 2018
 
(in millions of U.S. dollars)
Equity Securities

 
Other Investments

 
Total

 
Equity Securities

 
Other Investments

 
Total

Net gains (losses) recognized during the period
$
35

 
$
5

 
$
40

 
$
22

 
$
23

 
$
45

Less: Net gains (losses) recognized from sales of securities
48

 
—

 
48

 
63

 
—

 
63

Unrealized gains (losses) recognized for securities still held at reporting date
$
(13
)
 
$
5

 
$
(8
)
 
$
(41
)
 
$
23

 
$
(18
)
Schedule Of Aggregate Fair Value And Gross Unrealized Loss By Length Of Time The Security Has Continuously Been In An Unrealized Loss Position
The following tables present, for all securities in an unrealized loss position (including securities on loan), the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:
 
0 – 12 Months
 
 
Over 12 Months
 
 
Total
 
September 30, 2018
Fair Value

 
Gross
Unrealized
Loss

 
Fair Value

 
Gross
Unrealized
Loss

 
Fair Value

 
Gross
Unrealized
Loss

(in millions of U.S. dollars)
 
 
 
 
 
U.S. Treasury and agency
$
2,775

 
$
(57
)
 
$
1,912

 
$
(69
)
 
$
4,687

 
$
(126
)
Foreign
8,760

 
(194
)
 
3,683

 
(130
)
 
12,443

 
(324
)
Corporate securities
14,323

 
(335
)
 
2,272

 
(114
)
 
16,595

 
(449
)
Mortgage-backed securities
12,575

 
(371
)
 
4,029

 
(227
)
 
16,604

 
(598
)
States, municipalities, and political subdivisions
12,328

 
(223
)
 
2,712

 
(87
)
 
15,040

 
(310
)
Total fixed maturities
$
50,761

 
$
(1,180
)
 
$
14,608

 
$
(627
)
 
$
65,369

 
$
(1,807
)
 
0 – 12 Months
 
 
Over 12 Months
 
 
Total
 
December 31, 2017
Fair Value

 
Gross
Unrealized
Loss

 
Fair Value

 
Gross
Unrealized
Loss

 
Fair Value

 
Gross
Unrealized
Loss

(in millions of U.S. dollars)
 
 
 
 
 
U.S. Treasury and agency
$
2,172

 
$
(14
)
 
$
1,249

 
$
(26
)
 
$
3,421

 
$
(40
)
Foreign
5,657

 
(65
)
 
1,693

 
(49
)
 
7,350

 
(114
)
Corporate securities
5,210

 
(56
)
 
1,332

 
(46
)
 
6,542

 
(102
)
Mortgage-backed securities
6,194

 
(31
)
 
3,209

 
(74
)
 
9,403

 
(105
)
States, municipalities, and political subdivisions
9,259

 
(71
)
 
1,402

 
(32
)
 
10,661

 
(103
)
Total fixed maturities
28,492

 
(237
)
 
8,885

 
(227
)
 
37,377

 
(464
)
Equity securities
115

 
(12
)
 
—

 
—

 
115

 
(12
)
Other investments
78

 
(8
)
 
—

 
—

 
78

 
(8
)
Total
$
28,685

 
$
(257
)
 
$
8,885

 
$
(227
)
 
$
37,570

 
$
(484
)
Schedule Of Components Of Restricted Assets
The following table presents the components of restricted assets:
 
September 30

 
December 31

(in millions of U.S. dollars)
2018

 
2017

Trust funds
$
14,324

 
$
17,011

Deposits with U.S. regulatory authorities
2,453

 
2,345

Deposits with non-U.S. regulatory authorities
2,201

 
2,250

Assets pledged under repurchase agreements
1,470

 
1,434

Other pledged assets
628

 
414

 
$
21,076

 
$
23,454