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Investments (Tables)
 9 Months Ended
Sep. 30, 2020
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, 2020Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair
Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,564 $— $227 $— $2,791 
Non-U.S.23,858 (9)1,548 (115)25,282 
Corporate and asset-backed securities33,661 (25)1,895 (233)35,298 
Mortgage-backed securities18,272 — 1,078 (13)19,337 
Municipal6,846 — 302 (4)7,144 
$85,201 $(34)$5,050 $(365)$89,852 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair
Value
Held to maturity
U.S. Treasury / Agency$1,240 $— $1,240 $69 $— $1,309 
Non-U.S.1,273 (7)1,266 109 (1)1,374 
Corporate and asset-backed securities2,204 (36)2,168 252 (6)2,414 
Mortgage-backed securities2,104 (1)2,103 152 (2)2,253 
Municipal4,875 (1)4,874 249 — 5,123 
$11,696 $(45)$11,651 $831 $(9)$12,473 

December 31, 2019Amortized
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 / Agency$3,188 $96 $(1)$3,283 $— 
Non-U.S.22,670 1,099 (62)23,707 (25)
Corporate and asset-backed securities30,689 1,180 (78)31,791 (5)
Mortgage-backed securities18,712 494 (14)19,192 — 
Municipal7,321 205 (11)7,515 — 
$82,580 $3,074 $(166)$85,488 $(30)
Held to maturity
U.S. Treasury / Agency$1,318 $29 $— $1,347 $— 
Non-U.S.1,423 62 — 1,485 — 
Corporate and asset-backed securities2,349 121 (2)2,468 — 
Mortgage-backed securities2,331 65 — 2,396 — 
Municipal5,160 150 (1)5,309 — 
$12,581 $427 $(3)$13,005 $— 
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities and Related OTTI Recognized in AOCI
September 30, 2020Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair
Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,564 $— $227 $— $2,791 
Non-U.S.23,858 (9)1,548 (115)25,282 
Corporate and asset-backed securities33,661 (25)1,895 (233)35,298 
Mortgage-backed securities18,272 — 1,078 (13)19,337 
Municipal6,846 — 302 (4)7,144 
$85,201 $(34)$5,050 $(365)$89,852 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair
Value
Held to maturity
U.S. Treasury / Agency$1,240 $— $1,240 $69 $— $1,309 
Non-U.S.1,273 (7)1,266 109 (1)1,374 
Corporate and asset-backed securities2,204 (36)2,168 252 (6)2,414 
Mortgage-backed securities2,104 (1)2,103 152 (2)2,253 
Municipal4,875 (1)4,874 249 — 5,123 
$11,696 $(45)$11,651 $831 $(9)$12,473 

December 31, 2019Amortized
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 / Agency$3,188 $96 $(1)$3,283 $— 
Non-U.S.22,670 1,099 (62)23,707 (25)
Corporate and asset-backed securities30,689 1,180 (78)31,791 (5)
Mortgage-backed securities18,712 494 (14)19,192 — 
Municipal7,321 205 (11)7,515 — 
$82,580 $3,074 $(166)$85,488 $(30)
Held to maturity
U.S. Treasury / Agency$1,318 $29 $— $1,347 $— 
Non-U.S.1,423 62 — 1,485 — 
Corporate and asset-backed securities2,349 121 (2)2,468 — 
Mortgage-backed securities2,331 65 — 2,396 — 
Municipal5,160 150 (1)5,309 — 
$12,581 $427 $(3)$13,005 $— 
Schedule Of Fixed Maturities By Contractual Maturity
The following table presents fixed maturities by contractual maturity:
September 30December 31
 20202019
(in millions of U.S. dollars)Net Carrying ValueFair ValueAmortized CostFair Value
Available for sale
Due in 1 year or less$4,703 $4,703 $3,951 $3,973 
Due after 1 year through 5 years26,319 26,319 27,142 27,720 
Due after 5 years through 10 years26,456 26,456 23,901 24,874 
Due after 10 years13,037 13,037 8,874 9,729 
70,515 70,515 63,868 66,296 
Mortgage-backed securities19,337 19,337 18,712 19,192 
$89,852 $89,852 $82,580 $85,488 
Held to maturity
Due in 1 year or less$1,045 $1,056 $478 $479 
Due after 1 year through 5 years3,501 3,667 3,869 3,940 
Due after 5 years through 10 years3,119 3,315 3,756 3,883 
Due after 10 years1,883 2,182 2,147 2,307 
9,548 10,220 10,250 10,609 
Mortgage-backed securities2,103 2,253 2,331 2,396 
$11,651 $12,473 $12,581 $13,005 
Schedule of Realized Gain (Loss)
The following table presents the components of Net realized gains (losses):
Three Months EndedNine Months Ended
September 30September 30
(in millions of U.S. dollars)2020201920202019
Fixed maturities:
OTTI on fixed maturities, gross$— $(54)$— $(81)
OTTI on fixed maturities recognized in OCI (pre-tax)— 30 — 31 
OTTI on fixed maturities, net— (24)— (50)
Gross realized gains excluding OTTI50 70 195 153 
Gross realized losses excluding OTTI(32)(57)(331)(146)
Provision for expected credit losses42 — (4)— 
Impairment (1)
(11)— (163)— 
Total fixed maturities 49 (11)(303)(43)
Equity securities— 3 119 66 
Other investments31 (4)(71)(18)
Foreign exchange gains (losses)(222)84 (351)86 
Investment and embedded derivative instruments9 (97)38 (408)
Fair value adjustments on insurance derivative46 (106)(426)(57)
S&P futures(52)(6)(30)(89)
Other derivative instruments1 (14)(2)(8)
Other(3)(4)(43)(4)
Net realized gains (losses) (pre-tax)$(141)$(155)$(1,069)$(475)
(1)Relates to certain securities we intended to sell and securities written to market entering default.
Gain (Loss) on Securities [Table Text Block]
Realized gains and losses from Equity securities and Other investments from the table above include sales of securities and unrealized gains and losses from fair value changes as follows:
Three Months Ended
September 30
20202019
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains (losses) recognized during the period$— $31 $31 $3 $(4)$(1)
Less: Net gains (losses) recognized from sales of securities34 — 34 24 (2)22 
Unrealized gains (losses) recognized for securities still held at reporting date$(34)$31 $(3)$(21)$(2)$(23)

Nine Months Ended
September 30
20202019
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains (losses) recognized during the period$119 $(71)$48 $66 $(18)$48 
Less: Net gains (losses) recognized from sales of securities197 — 197 57 (4)53 
Unrealized gains (losses) recognized for securities still held at reporting date$(78)$(71)$(149)$9 $(14)$(5)
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 table presents, for AFS fixed maturities in an unrealized loss position (including securities on loan) that are not deemed to have credit losses, the aggregate fair value and gross unrealized loss by length of time the security has continuously been in an unrealized loss position:
0 – 12 MonthsOver 12 MonthsTotal
September 30, 2020Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss
(in millions of U.S. dollars)
Non-U.S.$2,848 $(89)$122 $(14)$2,970 $(103)
Corporate and asset-backed securities6,149 (145)721 (41)6,870 (186)
Mortgage-backed securities1,481 (11)26 (2)1,507 (13)
Municipal
190 (2)54 (2)244 (4)
Total AFS fixed maturities $10,668 $(247)$923 $(59)$11,591 $(306)
The following table presents, 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 MonthsOver 12 MonthsTotal
December 31, 2019Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss
(in millions of U.S. dollars)
U.S. Treasury / Agency$234 $(1)$339 $— $573 $(1)
Non-U.S.1,846 (34)802 (28)2,648 (62)
Corporate and asset-backed securities2,121 (40)988 (40)3,109 (80)
Mortgage-backed securities1,174 (6)932 (8)2,106 (14)
Municipal
188 — 276 (12)464 (12)
Total fixed maturities$5,563 $(81)$3,337 $(88)$8,900 $(169)
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block] The following table presents the amortized cost of our HTM securities according to S&P rating:
September 30, 2020
(in millions of U.S. dollars)Amortized cost% of Total
AAA$2,542 22 %
AA6,239 53 %
A2,072 18 %
BBB821 7 %
BB21 — %
Other1 — %
Total$11,696 100 %
Schedule Of Components Of Restricted Assets
The following table presents the components of restricted assets:
September 30December 31
(in millions of U.S. dollars)20202019
Trust funds$12,746 $14,004 
Deposits with U.S. regulatory authorities2,448 2,466 
Deposits with non-U.S. regulatory authorities2,957 2,709 
Assets pledged under repurchase agreements1,433 1,464 
Other pledged assets577 490 
Total$20,161 $21,133 
Debt Securities, Available-for-sale, Allowance for Credit Loss [Table Text Block]
The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities:
Three Months EndedNine Months Ended
September 30September 30
(in millions of U.S. dollars)20202020
Available for sale
Valuation allowance for expected credit losses - beginning of period$69 $— 
Impact of adoption of new accounting guidance— 25 
Provision for expected credit loss5 183 
Initial allowance for purchased securities with credit deterioration— 5 
Write-offs charged against the expected credit loss— (5)
Recovery of expected credit loss(40)(174)
Valuation allowance for expected credit losses - end of period$34 $34 
Held to maturity
Valuation allowance for expected credit losses - beginning of period$51 $— 
Impact of adoption of new accounting guidance— 44 
Provision for expected credit loss2 9 
Recoveries of amounts previously written off(8)(8)
Valuation allowance for expected credit losses - end of period$45 $45 
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block]
The following table presents a roll-forward of valuation allowance for expected credit losses on fixed maturities:
Three Months EndedNine Months Ended
September 30September 30
(in millions of U.S. dollars)20202020
Available for sale
Valuation allowance for expected credit losses - beginning of period$69 $— 
Impact of adoption of new accounting guidance— 25 
Provision for expected credit loss5 183 
Initial allowance for purchased securities with credit deterioration— 5 
Write-offs charged against the expected credit loss— (5)
Recovery of expected credit loss(40)(174)
Valuation allowance for expected credit losses - end of period$34 $34 
Held to maturity
Valuation allowance for expected credit losses - beginning of period$51 $— 
Impact of adoption of new accounting guidance— 44 
Provision for expected credit loss2 9 
Recoveries of amounts previously written off(8)(8)
Valuation allowance for expected credit losses - end of period$45 $45 
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
September 30December 31
 Expected
Liquidation
Period of Underlying Assets		20202019
(in millions of U.S. dollars)Fair
Value		Maximum
Future Funding
Commitments		Fair
Value		Maximum
Future Funding
Commitments
Financial
2 to 10 Years
$579 $293 $611 $329 
Real Assets
2 to 11 Years
724 704 712 422 
Distressed
2 to 8 Years
252 573 263 80 
Private Credit
3 to 8 Years
86 272 104 272 
Traditional
2 to 14 Years
3,727 1,455 2,844 2,160 
Vintage
1 to 2 Years
83 — 116 — 
Investment fundsNot Applicable243 — 271 — 
$5,694 $3,297 $4,921 $3,263