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Investments (Tables)
 6 Months Ended
Jun. 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
June 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$2,636  $—  $239  $—  $2,875  
Non-U.S.23,370  (17) 1,420  (166) 24,607  
Corporate and asset-backed securities32,721  (52) 1,658  (410) 33,917  
Mortgage-backed securities17,165  —  1,051  (18) 18,198  
Municipal6,848  —  270  (3) 7,115  
$82,740  $(69) $4,638  $(597) $86,712  
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair
Value
Held to maturity
U.S. Treasury / Agency$1,242  $—  $1,242  $73  $—  $1,315  
Non-U.S.1,278  (8) 1,270  102  (2) 1,370  
Corporate and asset-backed securities2,232  (41) 2,191  247  (10) 2,428  
Mortgage-backed securities2,189  (1) 2,188  146  (3) 2,331  
Municipal4,955  (1) 4,954  223  (1) 5,176  
$11,896  $(51) $11,845  $791  $(16) $12,620  

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
June 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$2,636  $—  $239  $—  $2,875  
Non-U.S.23,370  (17) 1,420  (166) 24,607  
Corporate and asset-backed securities32,721  (52) 1,658  (410) 33,917  
Mortgage-backed securities17,165  —  1,051  (18) 18,198  
Municipal6,848  —  270  (3) 7,115  
$82,740  $(69) $4,638  $(597) $86,712  
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair
Value
Held to maturity
U.S. Treasury / Agency$1,242  $—  $1,242  $73  $—  $1,315  
Non-U.S.1,278  (8) 1,270  102  (2) 1,370  
Corporate and asset-backed securities2,232  (41) 2,191  247  (10) 2,428  
Mortgage-backed securities2,189  (1) 2,188  146  (3) 2,331  
Municipal4,955  (1) 4,954  223  (1) 5,176  
$11,896  $(51) $11,845  $791  $(16) $12,620  

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:
June 30December 31
 20202019
(in millions of U.S. dollars)Net Carrying ValueFair ValueAmortized CostFair Value
Available for sale
Due in 1 year or less$4,487  $4,487  $3,951  $3,973  
Due after 1 year through 5 years26,867  26,867  27,142  27,720  
Due after 5 years through 10 years25,465  25,465  23,901  24,874  
Due after 10 years11,695  11,695  8,874  9,729  
68,514  68,514  63,868  66,296  
Mortgage-backed securities18,198  18,198  18,712  19,192  
$86,712  $86,712  $82,580  $85,488  
Held to maturity
Due in 1 year or less$890  $902  $478  $479  
Due after 1 year through 5 years3,505  3,662  3,869  3,940  
Due after 5 years through 10 years3,328  3,516  3,756  3,883  
Due after 10 years1,934  2,209  2,147  2,307  
9,657  10,289  10,250  10,609  
Mortgage-backed securities2,188  2,331  2,331  2,396  
$11,845  $12,620  $12,581  $13,005  
Schedule of Realized Gain (Loss)
The following table presents the components of Net realized gains (losses):
Three Months EndedSix Months Ended
June 30June 30
(in millions of U.S. dollars)2020201920202019
Fixed maturities:
OTTI on fixed maturities, gross$—  $(14) $—  $(27) 
OTTI on fixed maturities recognized in OCI (pre-tax)—  1  —  1  
OTTI on fixed maturities, net—  (13) —  (26) 
Gross realized gains excluding OTTI68  56  145  83  
Gross realized losses excluding OTTI(174) (31) (299) (89) 
Provision for expected credit losses104  —  (46) —  
Impairment (1)
(31) —  (152) —  
Total fixed maturities $(33) $12  $(352) $(32) 
Equity securities148  5  119  63  
Other investments(107) 30  (102) (14) 
Foreign exchange gains (losses)(61) (11) (129) 2  
Investment and embedded derivative instruments14  (181) 29  (311) 
Fair value adjustments on insurance derivative213  (65) (472) 49  
S&P futures(103) (20) 22  (83) 
Other derivative instruments(1) 7  (3) 6  
Other(40) —  (40) —  
Net realized gains (losses) (pre-tax)$30  $(223) $(928) $(320) 
(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
June 30
20202019
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains (losses) recognized during the period$148  $(107) $41  $5  $30  $35  
Less: Net gains (losses) recognized from sales of securities187  —  187  32  —  32  
Unrealized gains (losses) recognized for securities still held at reporting date$(39) $(107) $(146) $(27) $30  $3  

Six Months Ended
June 30
20202019
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains (losses) recognized during the period$119  $(102) $17  $63  $(14) $49  
Less: Net gains (losses) recognized from sales of securities163  —  163  33  (2) 31  
Unrealized gains (losses) recognized for securities still held at reporting date$(44) $(102) $(146) $30  $(12) $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 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
June 30, 2020Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss
(in millions of U.S. dollars)
Non-U.S.$3,172  $(117) $105  $(22) $3,277  $(139) 
Corporate and asset-backed securities7,985  (295) 551  (35) 8,536  (330) 
Mortgage-backed securities953  (13) 27  (2) 980  (15) 
Municipal
95  (1) 65  (2) 160  (3) 
Total AFS fixed maturities $12,205  $(426) $748  $(61) $12,953  $(487) 
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:
June 30, 2020
(in millions of U.S. dollars)Amortized cost% of Total
AAA$2,583  22 %
AA6,397  54 %
A2,302  19 %
BBB591  5 %
BB21  — %
Other2  — %
Total$11,896  100 %
Schedule Of Components Of Restricted Assets
The following table presents the components of restricted assets:
June 30December 31
(in millions of U.S. dollars)20202019
Trust funds$12,522  $14,004  
Deposits with U.S. regulatory authorities2,424  2,466  
Deposits with non-U.S. regulatory authorities2,807  2,709  
Assets pledged under repurchase agreements1,460  1,464  
Other pledged assets523  490  
Total$19,736  $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 EndedSix Months Ended
June 30June 30
(in millions of U.S. dollars)20202020
Available for sale
Valuation allowance for expected credit losses - beginning of period$176  $—  
Impact of adoption of new accounting guidance—  25  
Provision for expected credit loss29  178  
Initial allowance for purchased securities with credit deterioration3  5  
Write-offs charged against the expected credit loss(5) (5) 
Recovery of expected credit loss(134) (134) 
Valuation allowance for expected credit losses - end of period$69  $69  
Held to maturity
Valuation allowance for expected credit losses - beginning of period$45  $—  
Impact of adoption of new accounting guidance—  44  
Provision for expected credit loss6  7  
Valuation allowance for expected credit losses - end of period$51  $51  
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 EndedSix Months Ended
June 30June 30
(in millions of U.S. dollars)20202020
Available for sale
Valuation allowance for expected credit losses - beginning of period$176  $—  
Impact of adoption of new accounting guidance—  25  
Provision for expected credit loss29  178  
Initial allowance for purchased securities with credit deterioration3  5  
Write-offs charged against the expected credit loss(5) (5) 
Recovery of expected credit loss(134) (134) 
Valuation allowance for expected credit losses - end of period$69  $69  
Held to maturity
Valuation allowance for expected credit losses - beginning of period$45  $—  
Impact of adoption of new accounting guidance—  44  
Provision for expected credit loss6  7  
Valuation allowance for expected credit losses - end of period$51  $51  
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
June 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
$521  $309  $611  $329  
Real Assets
2 to 11 Years
674  749  712  422  
Distressed
2 to 8 Years
220  158  263  80  
Private Credit
3 to 8 Years
81  272  104  272  
Traditional
2 to 14 Years
3,039  1,852  2,844  2,160  
Vintage
1 to 2 Years
90  —  116  —  
Investment fundsNot Applicable228  —  271  —  
$4,853  $3,340  $4,921  $3,263