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Investments (Tables)
 6 Months Ended
Jun. 30, 2022
Investments, Debt and Equity Securities [Abstract]  
Schedule Of Amortized Cost and Fair Value of Available-for-sale Securities
June 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$2,248 $— $9 $(80)$2,177 
Non-U.S.24,646 (32)164 (1,961)22,817 
Corporate and asset-backed securities38,166 (45)59 (3,133)35,047 
Mortgage-backed securities18,654 (1)10 (1,328)17,335 
Municipal4,802 — 18 (127)4,693 
$88,516 $(78)$260 $(6,629)$82,069 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,298 $— $1,298 $4 $(29)$1,273 
Non-U.S.1,112 (4)1,108 2 (39)1,071 
Corporate and asset-backed securities1,844 (28)1,816 3 (73)1,746 
Mortgage-backed securities1,651 (1)1,650 1 (53)1,598 
Municipal3,661 (1)3,660 8 (23)3,645 
$9,566 $(34)$9,532 $18 $(217)$9,333 

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
June 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$2,248 $— $9 $(80)$2,177 
Non-U.S.24,646 (32)164 (1,961)22,817 
Corporate and asset-backed securities38,166 (45)59 (3,133)35,047 
Mortgage-backed securities18,654 (1)10 (1,328)17,335 
Municipal4,802 — 18 (127)4,693 
$88,516 $(78)$260 $(6,629)$82,069 
Amortized
Cost		Valuation AllowanceNet Carrying ValueGross
Unrealized
Appreciation		Gross
Unrealized
Depreciation		Fair Value
Held to maturity
U.S. Treasury / Agency$1,298 $— $1,298 $4 $(29)$1,273 
Non-U.S.1,112 (4)1,108 2 (39)1,071 
Corporate and asset-backed securities1,844 (28)1,816 3 (73)1,746 
Mortgage-backed securities1,651 (1)1,650 1 (53)1,598 
Municipal3,661 (1)3,660 8 (23)3,645 
$9,566 $(34)$9,532 $18 $(217)$9,333 

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:
June 30, 2022December 31, 2021
(in millions of U.S. dollars, except for percentages)Amortized cost% of TotalAmortized cost% of Total
AAA$1,883 20 %$2,089 21 %
AA5,273 55 %5,303 52 %
A1,740 18 %1,964 19 %
BBB647 7 %773 8 %
BB23 — %23 — %
Other— — %1 — %
Total$9,566 100 %$10,153 100 %
Schedule Of Fixed Maturities By Contractual Maturity
The following table presents fixed maturities by contractual maturity:
 June 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$4,086 $4,086 $4,498 $4,498 
Due after 1 year through 5 years23,265 23,265 25,542 25,542 
Due after 5 years through 10 years25,273 25,273 28,207 28,207 
Due after 10 years12,110 12,110 14,372 14,372 
64,734 64,734 72,619 72,619 
Mortgage-backed securities17,335 17,335 20,489 20,489 
$82,069 $82,069 $93,108 $93,108 
Held to maturity
Due in 1 year or less$925 $921 $888 $894 
Due after 1 year through 5 years3,660 3,605 3,744 3,846 
Due after 5 years through 10 years1,844 1,823 2,242 2,349 
Due after 10 years1,453 1,386 1,514 1,755 
7,882 7,735 8,388 8,844 
Mortgage-backed securities1,650 1,598 1,730 1,803 
$9,532 $9,333 $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
June 30, 2022Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss		Fair ValueGross
Unrealized
Loss
(in millions of U.S. dollars)
U.S. Treasury / Agency$1,707 $(70)$95 $(10)$1,802 $(80)
Non-U.S.15,832 (1,331)2,578 (334)18,410 (1,665)
Corporate and asset-backed securities27,714 (2,346)1,395 (204)29,109 (2,550)
Mortgage-backed securities15,048 (1,140)1,294 (187)16,342 (1,327)
Municipal
2,643 (117)10 (2)2,653 (119)
Total AFS fixed maturities $62,944 $(5,004)$5,372 $(737)$68,316 $(5,741)

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)
Municipal
226 (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 EndedSix Months Ended
June 30June 30
(in millions of U.S. dollars)2022202120222021
Available for sale
Valuation allowance for expected credit losses - beginning of period$27 $15 $14 $20 
Provision for expected credit loss61 1 78 5 
Recovery of expected credit loss(10)(5)(14)(14)
Valuation allowance for expected credit losses - end of period$78 $11 $78 $11 
Held to maturity
Valuation allowance for expected credit losses - beginning of period$34 $43 $35 $44 
Provision for expected credit loss1 — 1 — 
Recovery of expected credit loss(1)(6)(2)(7)
Valuation allowance for expected credit losses - end of period$34 $37 $34 $37 
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)2022202120222021
Fixed maturities:
Gross realized gains$362 $56 $401 $93 
Gross realized losses(700)(53)(827)(72)
Net (provision for) recovery of expected credit losses(51)10 (63)16 
Impairment (1)
(53)(1)(89)(1)
Total fixed maturities (442)12 (578)36 
Equity securities(263)150 (207)517 
Other investments4 62 59 100 
Foreign exchange268 (97)343 (21)
Investment and embedded derivative instruments(81)(91)(34)18 
Fair value adjustments on insurance derivative(143)(8)(108)311 
S&P futures144 (64)186 (108)
Other derivative instruments9 3 10 2 
Other (2)
— — (74)(1)
Net realized gains (losses) (pre-tax)$(504)$(33)$(403)$854 
(1)Relates to certain securities we intended to sell and securities written to market entering default.
(2)Other realized losses include impairment of assets related to Chubb's Russian entities.
Gain (Loss) on Securities [Table Text Block]
Realized gains and losses from Equity securities and Other investments from the table above include sales of securities and unrealized gains and losses from fair value changes as follows:
Three Months Ended
June 30
20222021
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains (losses) recognized during the period$(263)$4 $(259)$150 $62 $212 
Less: Net gains recognized from sales of securities163 — 163 45 — 45 
Unrealized gains (losses) recognized for securities still held at reporting date$(426)$4 $(422)$105 $62 $167 

Six Months Ended
June 30
20222021
(in millions of U.S. dollars)Equity SecuritiesOther InvestmentsTotalEquity SecuritiesOther InvestmentsTotal
Net gains (losses) recognized during the period$(207)$59 $(148)$517 $100 $617 
Less: Net gains recognized from sales of securities418 — 418 90 — 90 
Unrealized gains (losses) recognized for securities still held at reporting date$(625)$59 $(566)$427 $100 $527 
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)2022202120222021
Available for sale
Valuation allowance for expected credit losses - beginning of period$27 $15 $14 $20 
Provision for expected credit loss61 1 78 5 
Recovery of expected credit loss(10)(5)(14)(14)
Valuation allowance for expected credit losses - end of period$78 $11 $78 $11 
Held to maturity
Valuation allowance for expected credit losses - beginning of period$34 $43 $35 $44 
Provision for expected credit loss1 — 1 — 
Recovery of expected credit loss(1)(6)(2)(7)
Valuation allowance for expected credit losses - end of period$34 $37 $34 $37 
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Table Text Block]
 Expected
Liquidation
Period of Underlying Assets		June 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
$1,144 $530 $1,096 $267 
Real assets
2 to 13 Years
1,749 586 1,193 766 
Distressed
2 to 8 Years
992 823 753 641 
Private credit
3 to 8 Years
71 280 84 279 
Traditional
2 to 14 Years
6,911 5,145 6,647 5,200 
Vintage
1 to 2 Years
54 — 68 — 
Investment fundsNot Applicable317 — 267 — 
$11,238 $7,364 $10,108 $7,153 
Schedule Of Components Of Restricted Assets
The following table presents the components of restricted assets:
June 30December 31
(in millions of U.S. dollars)20222021
Trust funds$7,927 $9,915 
Deposits with U.S. regulatory authorities2,317 2,402 
Deposits with non-U.S. regulatory authorities2,964 2,873 
Assets pledged under repurchase agreements3,582 1,420 
Other pledged assets719 634 
Total$17,509 $17,244