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Investments (Tables)
 9 Months Ended
Sep. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities
September 30, 2022Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,725 $— $5 $(174)$2,556 
Non-U.S.26,766 (61)77 (2,599)24,183 
Corporate and asset-backed securities40,776 (85)30 (4,341)36,380 
Mortgage-backed securities18,425 (1)1 (2,190)16,235 
Municipal4,624 — 6 (243)4,387 
$93,316 $(147)$119 $(9,547)$83,741 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,281 $— $1,281 $— $(52)$1,229 
Non-U.S.1,046 (4)1,042 — (86)956 
Corporate and asset-backed securities1,769 (27)1,742 — (157)1,585 
Mortgage-backed securities1,549 (1)1,548 — (110)1,438 
Municipal3,364 (1)3,363 1 (81)3,283 
$9,009 $(33)$8,976 $1 $(486)$8,491 

December 31, 2021Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,111 $— $109 $(6)$2,214 
Non-U.S.25,156 (8)953 (272)25,829 
Corporate and asset-backed securities37,844 (6)1,410 (185)39,063 
Mortgage-backed securities20,080 — 532 (123)20,489 
Municipal5,302 — 216 (5)5,513 
$90,493 $(14)$3,220 $(591)$93,108 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,213 $— $1,213 $34 $(3)$1,244 
Non-U.S.1,201 (5)1,196 66 — 1,262 
Corporate and asset-backed securities2,032 (28)2,004 197 — 2,201 
Mortgage-backed securities1,731 (1)1,730 74 (1)1,803 
Municipal3,976 (1)3,975 162 — 4,137 
$10,153 $(35)$10,118 $533 $(4)$10,647 
Schedule Of Amortized Cost And Fair Value Of HTM Fixed Maturities
September 30, 2022Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,725 $— $5 $(174)$2,556 
Non-U.S.26,766 (61)77 (2,599)24,183 
Corporate and asset-backed securities40,776 (85)30 (4,341)36,380 
Mortgage-backed securities18,425 (1)1 (2,190)16,235 
Municipal4,624 — 6 (243)4,387 
$93,316 $(147)$119 $(9,547)$83,741 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,281 $— $1,281 $— $(52)$1,229 
Non-U.S.1,046 (4)1,042 — (86)956 
Corporate and asset-backed securities1,769 (27)1,742 — (157)1,585 
Mortgage-backed securities1,549 (1)1,548 — (110)1,438 
Municipal3,364 (1)3,363 1 (81)3,283 
$9,009 $(33)$8,976 $1 $(486)$8,491 

December 31, 2021Amortized
Cost		Valuation AllowanceGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
(in millions of U.S. dollars)
Available for sale
U.S. Treasury / Agency$2,111 $— $109 $(6)$2,214 
Non-U.S.25,156 (8)953 (272)25,829 
Corporate and asset-backed securities37,844 (6)1,410 (185)39,063 
Mortgage-backed securities20,080 — 532 (123)20,489 
Municipal5,302 — 216 (5)5,513 
$90,493 $(14)$3,220 $(591)$93,108 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,213 $— $1,213 $34 $(3)$1,244 
Non-U.S.1,201 (5)1,196 66 — 1,262 
Corporate and asset-backed securities2,032 (28)2,004 197 — 2,201 
Mortgage-backed securities1,731 (1)1,730 74 (1)1,803 
Municipal3,976 (1)3,975 162 — 4,137 
$10,153 $(35)$10,118 $533 $(4)$10,647 
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block]
The following table presents the amortized cost of our held to maturity securities according to S&P rating:
September 30, 2022December 31, 2021
(in millions of U.S. dollars, except for percentages)Amortized cost% of TotalAmortized cost% of Total
AAA$1,710 19 %$2,089 21 %
AA4,975 55 %5,303 52 %
A1,679 19 %1,964 19 %
BBB622 7 %773 8 %
BB23 — %23 — %
Other— — %1 — %
Total$9,009 100 %$10,153 100 %
Schedule Of Fixed Maturities By Contractual Maturity
The following table presents fixed maturities by contractual maturity:
 September 30, 2022December 31, 2021
(in millions of U.S. dollars)Net Carrying ValueFair ValueNet Carrying ValueFair Value
Available for sale
Due in 1 year or less$3,173 $3,173 $4,498 $4,498 
Due after 1 year through 5 years23,685 23,685 25,542 25,542 
Due after 5 years through 10 years26,350 26,350 28,207 28,207 
Due after 10 years14,298 14,298 14,372 14,372 
67,506 67,506 72,619 72,619 
Mortgage-backed securities16,235 16,235 20,489 20,489 
$83,741 $83,741 $93,108 $93,108 
Held to maturity
Due in 1 year or less$1,003 $990 $888 $894 
Due after 1 year through 5 years3,373 3,233 3,744 3,846 
Due after 5 years through 10 years1,743 1,677 2,242 2,349 
Due after 10 years1,309 1,153 1,514 1,755 
7,428 7,053 8,388 8,844 
Mortgage-backed securities1,548 1,438 1,730 1,803 
$8,976 $8,491 $10,118 $10,647 
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 available for sale (AFS) fixed maturities in an unrealized loss position (including securities on loan) that are not deemed to have expected credit losses, the aggregate fair value and gross unrealized loss by length of time the security has been in an unrealized loss position:
0 – 12 MonthsOver 12 MonthsTotal
September 30, 2022Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss
(in millions of U.S. dollars)
U.S. Treasury / Agency$1,873 $(145)$227 $(29)$2,100 $(174)
Non-U.S.16,585 (1,480)3,907 (588)20,492 (2,068)
Corporate and asset-backed securities28,533 (2,832)2,621 (456)31,154 (3,288)
Mortgage-backed securities12,776 (1,459)3,324 (728)16,100 (2,187)
Municipal3,905 (216)70 (18)3,975 (234)
Total AFS fixed maturities $63,672 $(6,132)$10,149 $(1,819)$73,821 $(7,951)

0 – 12 MonthsOver 12 MonthsTotal
December 31, 2021Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss
(in millions of U.S. dollars)
U.S. Treasury / Agency$363 $(3)$70 $(3)$433 $(6)
Non-U.S.6,917 (196)1,093 (62)8,010 (258)
Corporate and asset-backed securities9,449 (145)806 (32)10,255 (177)
Mortgage-backed securities8,086 (116)190 (7)8,276 (123)
Municipal226 (5)— — 226 (5)
Total AFS fixed maturities$25,041 $(465)$2,159 $(104)$27,200 $(569)
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)2022202120222021
Available for sale
Valuation allowance for expected credit losses - beginning of period$78 $11 $14 $20 
Provision for expected credit loss91 3 169 8 
Foreign currency revaluation(2)— (2)— 
Recovery of expected credit loss(20)(2)(34)(16)
Valuation allowance for expected credit losses - end of period$147 $12 $147 $12 
Held to maturity
Valuation allowance for expected credit losses - beginning of period$34 $37 $35 $44 
Provision for expected credit loss— — 1 — 
Recovery of expected credit loss(1)(2)(3)(9)
Valuation allowance for expected credit losses - end of period$33 $35 $33 $35 
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)2022202120222021
Fixed maturities:
Gross realized gains$144 $27 $545 $120 
Gross realized losses(331)(27)(1,158)(99)
Net (provision for) recovery of expected credit losses(70)1 (133)17 
Impairment (1)
(22)(11)(111)(12)
Total fixed maturities (279)(10)(857)26 
Equity securities(80)(42)(287)475 
Other investments(42)11 17 111 
Foreign exchange198 106 541 85 
Investment and embedded derivative instruments(198)(9)(232)9 
Fair value adjustments on insurance derivative22 (59)(86)252 
S&P futures54 (4)240 (112)
Other derivative instruments(19)(10)(9)(8)
Other (2)
(40)(4)(114)(5)
Net realized gains (losses) (pre-tax)$(384)$(21)$(787)$833 
(1)Relates to certain securities we intended to sell and securities written to market entering default.
(2)Other realized losses includes $36 million related to impairment of fixed assets. The nine months ended September 30, 2022 also includes impairment of assets related to Chubb’s Russian entities.
Gain (Loss) on Securities [Table Text Block]
Realized gains and losses from Equity securities and Other investments from the table above include sales of securities and unrealized gains and losses from fair value changes as follows:
Three Months Ended
September 30
20222021
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains (losses) recognized during the period$(80)$(42)$(122)$(42)$11 $(31)
Less: Net gains (losses) recognized from sales of securities(12)— (12)19 — 19 
Unrealized gains (losses) recognized for securities still held at reporting date$(68)$(42)$(110)$(61)$11 $(50)
Nine Months Ended
September 30
20222021
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains (losses) recognized during the period$(287)$17 $(270)$475 $111 $586 
Less: Net gains recognized from sales of securities406 — 406 109 — 109 
Unrealized gains (losses) recognized for securities still held at reporting date$(693)$17 $(676)$366 $111 $477 
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)2022202120222021
Available for sale
Valuation allowance for expected credit losses - beginning of period$78 $11 $14 $20 
Provision for expected credit loss91 3 169 8 
Foreign currency revaluation(2)— (2)— 
Recovery of expected credit loss(20)(2)(34)(16)
Valuation allowance for expected credit losses - end of period$147 $12 $147 $12 
Held to maturity
Valuation allowance for expected credit losses - beginning of period$34 $37 $35 $44 
Provision for expected credit loss— — 1 — 
Recovery of expected credit loss(1)(2)(3)(9)
Valuation allowance for expected credit losses - end of period$33 $35 $33 $35 
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
 Expected
Liquidation
Period of Underlying Assets		September 30, 2022December 31, 2021
(in millions of U.S. dollars)Fair
Value		Maximum
Future Funding
Commitments		Fair
Value		Maximum
Future Funding
Commitments
Financial
2 to 10 Years
$1,085 $528 $1,096 $267 
Real assets
2 to 13 Years
2,045 807 1,193 766 
Distressed
2 to 8 Years
1,055 746 753 641 
Private credit
3 to 8 Years
194 450 84 279 
Traditional
2 to 14 Years
7,548 5,091 6,647 5,200 
Vintage
1 to 2 Years
51 — 68 — 
Investment fundsNot Applicable414 — 267 — 
$12,392 $7,622 $10,108 $7,153 
Schedule Of Components Of Restricted Assets
The following table presents the components of restricted assets:
September 30December 31
(in millions of U.S. dollars)20222021
Trust funds$7,992 $9,915 
Deposits with U.S. regulatory authorities2,318 2,402 
Deposits with non-U.S. regulatory authorities2,825 2,873 
Assets pledged under repurchase agreements2,529 1,420 
Other pledged assets674 634 
Total$16,338 $17,244