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Investments (Tables) | 9 Months Ended
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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 |

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