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Investments (Tables)
 3 Months Ended
Mar. 31, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities And Related OTTI Recognized In AOCI
March 31, 2019
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
$
3,760

 
$
50

 
$
(19
)
 
$
3,791

 
$
—

Foreign
21,796

 
658

 
(112
)
 
22,342

 
—

Corporate securities
27,519

 
476

 
(170
)
 
27,825

 
(5
)
Mortgage-backed securities
16,369

 
173

 
(112
)
 
16,430

 
(1
)
States, municipalities, and political subdivisions
10,180

 
123

 
(28
)
 
10,275

 
—

 
$
79,624

 
$
1,480

 
$
(441
)
 
$
80,663

 
$
(6
)
Held to maturity
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
1,144

 
$
11

 
$
(3
)
 
$
1,152

 
$
—

Foreign
1,503

 
34

 
(3
)
 
1,534

 
—

Corporate securities
2,543

 
30

 
(34
)
 
2,539

 
—

Mortgage-backed securities
2,484

 
16

 
(6
)
 
2,494

 
—

States, municipalities, and political subdivisions
5,462

 
67

 
(8
)
 
5,521

 
—

 
$
13,136

 
$
158

 
$
(54
)
 
$
13,240

 
$
—


December 31, 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
$
4,158

 
$
30

 
$
(43
)
 
$
4,145

 
$
—

Foreign
21,370

 
395

 
(349
)
 
21,416

 
—

Corporate securities
27,183

 
150

 
(750
)
 
26,583

 
(6
)
Mortgage-backed securities
15,758

 
66

 
(284
)
 
15,540

 
(1
)
States, municipalities, and political subdivisions
10,854

 
49

 
(117
)
 
10,786

 
—

 
$
79,323

 
$
690

 
$
(1,543
)
 
$
78,470

 
$
(7
)
Held to maturity
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
1,185

 
$
8

 
$
(11
)
 
$
1,182

 
$
—

Foreign
1,549

 
11

 
(18
)
 
1,542

 
—

Corporate securities
2,601

 
11

 
(104
)
 
2,508

 
—

Mortgage-backed securities
2,524

 
5

 
(43
)
 
2,486

 
—

States, municipalities, and political subdivisions
5,576

 
16

 
(51
)
 
5,541

 
—

 
$
13,435

 
$
51

 
$
(227
)
 
$
13,259

 
$
—
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI
 
March 31, 2019
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
$
3,760

 
$
50

 
$
(19
)
 
$
3,791

 
$
—

Foreign
21,796

 
658

 
(112
)
 
22,342

 
—

Corporate securities
27,519

 
476

 
(170
)
 
27,825

 
(5
)
Mortgage-backed securities
16,369

 
173

 
(112
)
 
16,430

 
(1
)
States, municipalities, and political subdivisions
10,180

 
123

 
(28
)
 
10,275

 
—

 
$
79,624

 
$
1,480

 
$
(441
)
 
$
80,663

 
$
(6
)
Held to maturity
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
1,144

 
$
11

 
$
(3
)
 
$
1,152

 
$
—

Foreign
1,503

 
34

 
(3
)
 
1,534

 
—

Corporate securities
2,543

 
30

 
(34
)
 
2,539

 
—

Mortgage-backed securities
2,484

 
16

 
(6
)
 
2,494

 
—

States, municipalities, and political subdivisions
5,462

 
67

 
(8
)
 
5,521

 
—

 
$
13,136

 
$
158

 
$
(54
)
 
$
13,240

 
$
—


December 31, 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
$
4,158

 
$
30

 
$
(43
)
 
$
4,145

 
$
—

Foreign
21,370

 
395

 
(349
)
 
21,416

 
—

Corporate securities
27,183

 
150

 
(750
)
 
26,583

 
(6
)
Mortgage-backed securities
15,758

 
66

 
(284
)
 
15,540

 
(1
)
States, municipalities, and political subdivisions
10,854

 
49

 
(117
)
 
10,786

 
—

 
$
79,323

 
$
690

 
$
(1,543
)
 
$
78,470

 
$
(7
)
Held to maturity
 
 
 
 
 
 
 
 
 
U.S. Treasury and agency
$
1,185

 
$
8

 
$
(11
)
 
$
1,182

 
$
—

Foreign
1,549

 
11

 
(18
)
 
1,542

 
—

Corporate securities
2,601

 
11

 
(104
)
 
2,508

 
—

Mortgage-backed securities
2,524

 
5

 
(43
)
 
2,486

 
—

States, municipalities, and political subdivisions
5,576

 
16

 
(51
)
 
5,541

 
—

 
$
13,435

 
$
51

 
$
(227
)
 
$
13,259

 
$
—
Schedule Of Fixed Maturities By Contractual Maturity
The following table presents fixed maturities by contractual maturity:
 
 
 
March 31

 
 
 
December 31

 
 
 
2019

 
 
 
2018

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

 
Fair Value

 
Amortized Cost

 
Fair Value

Available for sale
 
 
 
 
 
 
 
Due in 1 year or less
$
3,776

 
$
3,785

 
$
3,569

 
$
3,568

Due after 1 year through 5 years
27,308

 
27,593

 
27,134

 
27,005

Due after 5 years through 10 years
23,367

 
23,690

 
24,095

 
23,543

Due after 10 years
8,804

 
9,165

 
8,767

 
8,814

 
63,255

 
64,233

 
63,565

 
62,930

Mortgage-backed securities
16,369

 
16,430

 
15,758

 
15,540

 
$
79,624

 
$
80,663

 
$
79,323

 
$
78,470

Held to maturity
 
 
 
 
 
 
 
Due in 1 year or less
$
614

 
$
616

 
$
536

 
$
537

Due after 1 year through 5 years
3,111

 
3,125

 
3,122

 
3,106

Due after 5 years through 10 years
4,246

 
4,287

 
4,468

 
4,407

Due after 10 years
2,681

 
2,718

 
2,785

 
2,723

 
10,652

 
10,746

 
10,911

 
10,773

Mortgage-backed securities
2,484

 
2,494

 
2,524

 
2,486

 
$
13,136

 
$
13,240

 
$
13,435

 
$
13,259
Schedule of Realized Gain (Loss)
The following table presents the components of Net realized gains (losses):
 
Three Months Ended
 
 
March 31
 
(in millions of U.S. dollars)
2019

 
2018

Fixed maturities:
 
 
 
OTTI on fixed maturities, gross and net
$
(13
)
 
$
(1
)
Gross realized gains excluding OTTI
27

 
66

Gross realized losses excluding OTTI
(58
)
 
(88
)
Total fixed maturities
(44
)
 
(23
)
Equity securities:
 
 
 
Gross realized gains excluding OTTI
64

 
10

Gross realized losses excluding OTTI
(6
)
 
(21
)
Total equity securities
58

 
(11
)
Other investments
(44
)
 
29

Foreign exchange gains (losses)
13

 
(77
)
Investment and embedded derivative instruments
(130
)
 
17

Fair value adjustments on insurance derivative
114

 
38

S&P futures
(63
)
 
22

Other derivative instruments
(1
)
 
2

Other
—

 
1

Net realized gains (losses) (pre-tax)
$
(97
)
 
$
(2
)
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
 
 
March 31
 
(in millions of U.S. dollars)
2019

 
2018

Balance of credit losses related to securities still held – beginning of period
$
34

 
$
22

Additions where no OTTI was previously recorded
6

 
—

Reductions for securities sold during the period
(8
)
 
(7
)
Balance of credit losses related to securities still held – end of period
$
32

 
$
15
Gain (Loss) on Securities [Table Text Block]
equity securities and other investments, including both sales of securities and unrealized gains and losses from changes in fair value:

 
 
 
 
 
 
 
Three Months Ended
 
 
 
 
March 31
 
 
2019
 
 
2018
 
(in millions of U.S. dollars)
Equity Securities

 
Other Investments

 
Total

 
Equity Securities

 
Other Investments

 
Total

Net gains (losses) recognized during the period
$
58

 
$
(44
)
 
$
14

 
$
(11
)
 
$
29

 
$
18

Less: Net gains (losses) recognized from sales of securities
1

 
(2
)
 
(1
)
 
10

 
—

 
10

Unrealized gains (losses) recognized for securities still held at reporting date
$
57

 
$
(42
)
 
$
15

 
$
(21
)
 
$
29

 
$
8
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
 
March 31, 2019
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
$
68

 
$
—

 
$
2,298

 
$
(22
)
 
$
2,366

 
$
(22
)
Foreign
1,346

 
(26
)
 
4,228

 
(89
)
 
5,574

 
(115
)
Corporate securities
3,649

 
(62
)
 
6,206

 
(142
)
 
9,855

 
(204
)
Mortgage-backed securities
388

 
(1
)
 
8,974

 
(117
)
 
9,362

 
(118
)
States, municipalities, and political subdivisions
93

 
—

 
4,867

 
(36
)
 
4,960

 
(36
)
Total fixed maturities
$
5,544

 
$
(89
)
 
$
26,573

 
$
(406
)
 
$
32,117

 
$
(495
)
 
0 – 12 Months
 
 
Over 12 Months
 
 
Total
 
December 31, 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
$
523

 
$
(4
)
 
$
2,859

 
$
(50
)
 
$
3,382

 
$
(54
)
Foreign
6,764

 
(208
)
 
5,349

 
(159
)
 
12,113

 
(367
)
Corporate securities
16,538

 
(599
)
 
4,873

 
(255
)
 
21,411

 
(854
)
Mortgage-backed securities
6,103

 
(98
)
 
6,913

 
(229
)
 
13,016

 
(327
)
States, municipalities, and political subdivisions
5,024

 
(44
)
 
7,768

 
(124
)
 
12,792

 
(168
)
Total fixed maturities
$
34,952

 
$
(953
)
 
$
27,762

 
$
(817
)
 
$
62,714

 
$
(1,770
)
Schedule Of Components Of Restricted Assets
The following table presents the components of restricted assets:
 
March 31

 
December 31

(in millions of U.S. dollars)
2019

 
2018

Trust funds
$
13,943

 
$
13,988

Deposits with U.S. regulatory authorities
2,904

 
2,405

Deposits with non-U.S. regulatory authorities
2,851

 
2,531

Assets pledged under repurchase agreements
1,478

 
1,468

Other pledged assets
942

 
692

Total
$
22,118

 
$
21,084