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Fair value measurements (Tables)
 12 Months Ended
Dec. 31, 2021
Fair Value Disclosures [Abstract]  
Financial Instruments Measured At Fair Value On A Recurring Basis
Financial instruments measured at fair value on a recurring basis, by valuation hierarchy 
December 31, 2021Level 1Level 2Level 3Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available for sale
U.S. Treasury / Agency$1,680 $534 $— $2,214 
Non-U.S.— 25,196 633 25,829 
Corporate and asset-backed securities— 37,014 2,049 39,063 
Mortgage-backed securities— 20,463 26 20,489 
Municipal— 5,513 — 5,513 
1,680 88,720 2,708 93,108 
Equity securities4,705 — 77 4,782 
Short-term investments1,744 1,395 7 3,146 
Other investments (1)
286 481 — 767 
Securities lending collateral— 1,831 — 1,831 
Investment derivative instruments58 — — 58 
Separate account assets5,461 99 — 5,560 
Total assets measured at fair value (1)
$13,934 $92,526 $2,792 $109,252 
Liabilities:
Investment derivative instruments$166 $— $— $166 
Other derivative instruments16 — — 16 
GLB (2)
— — 745 745 
Total liabilities measured at fair value$182 $— $745 $927 
(1)Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $10,108 million, policy loans of $243 million and other investments of $51 million at December 31, 2021 measured using NAV as a practical expedient.
(2)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.

 
December 31, 2020Level 1Level 2Level 3Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available for sale
U.S. Treasury / Agency$2,148 $522 $— $2,670 
Non-U.S.— 25,808 546 26,354 
Corporate and asset-backed securities— 34,758 1,573 36,331 
Mortgage-backed securities— 18,410 60 18,470 
Municipal— 6,874 — 6,874 
2,148 86,372 2,179 90,699 
Equity securities3,954 — 73 4,027 
Short-term investments2,866 1,474 5 4,345 
Other investments (1)
434 438 10 882 
Securities lending collateral— 1,844 — 1,844 
Investment derivative instruments35 — — 35 
Separate account assets4,264 124 — 4,388 
Total assets measured at fair value (1)
$13,701 $90,252 $2,267 $106,220 
Liabilities:
Investment derivative instruments$52 $— $— $52 
Other derivative instruments17 — — 17 
GLB (2)
— — 1,089 1,089 
Total liabilities measured at fair value$69 $— $1,089 $1,158 
(1)Excluded from the table above are partially-owned investments, investment funds, and limited partnerships of $6,770 million, policy loans of $233 million and other investments of $60 million at December 31, 2020 measured using NAV as a practical expedient.
(2)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
Schedule Of Significant Unobservable Inputs Used In Level 3 Liability Valuations
The following table presents the significant unobservable inputs used in the Level 3 liability valuations. Excluded from the table below are inputs used to determine the fair value of Level 3 assets which are based on single broker quotes and contain no quantitative unobservable inputs developed by management. The majority of our fixed maturities classified as Level 3 used external pricing when markets are less liquid due to the lack of market inputs (i.e., stale pricing, broker quotes).
(in millions of U.S. dollars, except for percentages)Fair Value at December 31 2021Valuation
Technique		Significant
Unobservable Inputs		Ranges
Weighted Average (1)
GLB (1)
$745 Actuarial modelLapse rate
3% - 31%
4.5 %
Annuitization rate
0% - 100%
3.6 %
(1)The weighted average lapse and annuitization rates are determined by weighting each treaty's rates by the GLB contracts fair value.
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation
The following tables present a reconciliation of the beginning and ending balances of financial instruments measured at fair value using significant unobservable inputs (Level 3): 
 AssetsLiabilities
 Available-for-Sale Debt SecuritiesEquity
securities		Short-term investmentsOther
investments
GLB (1)
Year Ended December 31, 2021Non-U.S.Corporate and asset-backed securitiesMortgage-backed securities
(in millions of U.S. dollars)
Balance, beginning of year
$546 $1,573 $60 $73 $5 $10 $1,089 
Transfers into Level 324 91 — — — — — 
Transfers out of Level 3(11)(76)(18)— — (10)— 
Change in Net Unrealized Gains/Losses in OCI
(30)15 — — (1)— — 
Net Realized Gains/Losses
(1)(2)— 8 — — (316)
Purchases275 1,154 18 21 9 — — 
Sales(48)(99)(1)(25)— — — 
Settlements(122)(607)(33)— (6)— — 
Other— — — — — — (28)
Balance, end of year$633 $2,049 $26 $77 $7 $— $745 
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date
$— $3 $— $5 $— $— $(316)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date

$(25)$17 $— $— $— $— $— 
(1)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
 AssetsLiabilities
 Available-for-Sale Debt SecuritiesEquity
securities		Short-term investmentsOther
investments
GLB (1)
Year Ended December 31, 2020Non-U.S.Corporate and asset-backed securities Mortgage-backed securities
(in millions of U.S. dollars)
Balance, beginning of year
$449 $1,451 $60 $69 $6 $10 $897 
Transfers into Level 3— 134 — — — — — 
Transfers out of Level 3(16)(73)(1)(3)— — — 
Change in Net Unrealized Gains/Losses in OCI
19 (8)— — — — — 
Net Realized Gains/Losses
(1)(30)— 1 (1)— 202 
Purchases
274 708 2 23 14 — — 
Sales(122)(186)— (17)(2)— — 
Settlements(57)(423)(1)— (12)— — 
Other— — — — — — (10)
Balance, end of year$546 $1,573 $60 $73 $5 $10 $1,089 
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date
$— $(5)$— $4 $— $— $202 
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date$16 $(6)$— $— $— $— $— 
(1)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
 AssetsLiabilities
 Available-for-Sale Debt SecuritiesShort-term investments
GLB (1)
Year Ended December 31, 2019Non-U.S.Corporate and asset-backed securitiesMortgage-backed securitiesEquity
securities		Other
investments
(in millions of U.S. dollars)
Balance, beginning of year$345 $1,299 $61 $57 $1 $11 $861 
Transfers into Level 311 23 — — — — — 
Transfers out of Level 3(24)(38)(16)— — — — 
Change in Net Unrealized Gains/Losses in OCI13 (2)— 1 — — — 
Net Realized Gains/Losses(1)(4)— (2)— — 4 
Purchases
228 577 19 34 6 — — 
Sales(70)(125)(1)(21)— — — 
Settlements(53)(279)(3)— (1)(1)— 
Other— — — — — — 32 
Balance, end of year$449 $1,451 $60 $69 $6 $10 $897 
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date$— $(2)$— $(3)$— $— $4 
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date$7 $(8)$— $— $— $— $— 
(1)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]
 AssetsLiabilities
 Available-for-Sale Debt SecuritiesEquity
securities		Short-term investmentsOther
investments
GLB (1)
Year Ended December 31, 2021Non-U.S.Corporate and asset-backed securitiesMortgage-backed securities
(in millions of U.S. dollars)
Balance, beginning of year
$546 $1,573 $60 $73 $5 $10 $1,089 
Transfers into Level 324 91 — — — — — 
Transfers out of Level 3(11)(76)(18)— — (10)— 
Change in Net Unrealized Gains/Losses in OCI
(30)15 — — (1)— — 
Net Realized Gains/Losses
(1)(2)— 8 — — (316)
Purchases275 1,154 18 21 9 — — 
Sales(48)(99)(1)(25)— — — 
Settlements(122)(607)(33)— (6)— — 
Other— — — — — — (28)
Balance, end of year$633 $2,049 $26 $77 $7 $— $745 
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date
$— $3 $— $5 $— $— $(316)
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date

$(25)$17 $— $— $— $— $— 
(1)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
 AssetsLiabilities
 Available-for-Sale Debt SecuritiesEquity
securities		Short-term investmentsOther
investments
GLB (1)
Year Ended December 31, 2020Non-U.S.Corporate and asset-backed securities Mortgage-backed securities
(in millions of U.S. dollars)
Balance, beginning of year
$449 $1,451 $60 $69 $6 $10 $897 
Transfers into Level 3— 134 — — — — — 
Transfers out of Level 3(16)(73)(1)(3)— — — 
Change in Net Unrealized Gains/Losses in OCI
19 (8)— — — — — 
Net Realized Gains/Losses
(1)(30)— 1 (1)— 202 
Purchases
274 708 2 23 14 — — 
Sales(122)(186)— (17)(2)— — 
Settlements(57)(423)(1)— (12)— — 
Other— — — — — — (10)
Balance, end of year$546 $1,573 $60 $73 $5 $10 $1,089 
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date
$— $(5)$— $4 $— $— $202 
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date$16 $(6)$— $— $— $— $— 
(1)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
 AssetsLiabilities
 Available-for-Sale Debt SecuritiesShort-term investments
GLB (1)
Year Ended December 31, 2019Non-U.S.Corporate and asset-backed securitiesMortgage-backed securitiesEquity
securities		Other
investments
(in millions of U.S. dollars)
Balance, beginning of year$345 $1,299 $61 $57 $1 $11 $861 
Transfers into Level 311 23 — — — — — 
Transfers out of Level 3(24)(38)(16)— — — — 
Change in Net Unrealized Gains/Losses in OCI13 (2)— 1 — — — 
Net Realized Gains/Losses(1)(4)— (2)— — 4 
Purchases
228 577 19 34 6 — — 
Sales(70)(125)(1)(21)— — — 
Settlements(53)(279)(3)— (1)(1)— 
Other— — — — — — 32 
Balance, end of year$449 $1,451 $60 $69 $6 $10 $897 
Net Realized Gains/Losses Attributable to Changes in Fair Value at the Balance Sheet Date$— $(2)$— $(3)$— $— $4 
Change in Net Unrealized Gains/Losses included in OCI at the Balance Sheet Date$7 $(8)$— $— $— $— $— 
(1)Our GLB reinsurance product meets the definition of a derivative instrument for accounting purposes and is accordingly carried at fair value.
Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value
December 31, 2021Fair ValueNet Carrying Value
(in millions of U.S. dollars)Level 1Level 2Level 3Total
Assets:
Fixed maturities held to maturity
U.S. Treasury / Agency$1,192 $52 $— $1,244 $1,213 
Non-U.S.— 1,262 — 1,262 1,196 
Corporate and asset-backed securities— 2,201 — 2,201 2,004 
Mortgage-backed securities— 1,803 — 1,803 1,730 
Municipal— 4,137 — 4,137 3,975 
Total assets$1,192 $9,455 $— $10,647 $10,118 
Liabilities:
Repurchase agreements$— $1,406 $— $1,406 $1,406 
Short-term debt— 1,019 — 1,019 999 
Long-term debt— 16,848 — 16,848 15,169 
Trust preferred securities— 460 — 460 308 
Total liabilities$— $19,733 $— $19,733 $17,882 
December 31, 2020Fair ValueNet Carrying Value
(in millions of U.S. dollars)Level 1Level 2Level 3Total
Assets:
Fixed maturities held to maturity
U.S. Treasury / Agency$1,395 $57 $— $1,452 $1,392 
Non-U.S.— 1,405 — 1,405 1,288 
Corporate and asset-backed securities— 2,438 — 2,438 2,150 
Mortgage-backed securities— 2,146 — 2,146 1,999 
Municipal— 5,069 — 5,069 4,824 
Total assets$1,395 $11,115 $— $12,510 $11,653 
Liabilities:
Repurchase agreements$— $1,405 $— $1,405 $1,405 
Long-term debt— 17,487 — 17,487 14,948 
Trust preferred securities— 473 — 473 308 
Total liabilities$— $19,365 $— $19,365 $16,661