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Fair value measurements (Tables)
9 Months Ended
Sep. 30, 2024
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
September 30, 2024Level 1Level 2Level 3Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available-for-sale
U.S. Treasury / Agency$1,979 $650 $ $2,629 
Non-U.S. 36,862 639 37,501 
Corporate and asset-backed securities 43,915 2,778 46,693 
Mortgage-backed securities 28,428 46 28,474 
Municipal 1,968  1,968 
1,979 111,823 3,463 117,265 
Equity securities4,286  118 4,404 
Short-term investments2,491 1,869 15 4,375 
Other investments (1)
616 6,424  7,040 
Securities lending collateral 1,927  1,927 
Investment derivatives42   42 
Derivatives designated as hedging instruments 150  150 
Separate account assets5,919 77  5,996 
Total assets measured at fair value (1)(2)
$15,333 $122,270 $3,596 $141,199 
Liabilities:
Investment derivatives$127 $ $ $127 
Derivatives designated as hedging instruments 174  174 
Other derivative instruments25 5  30 
Market risk benefits (3)
  748 748 
Total liabilities measured at fair value$152 $179 $748 $1,079 
(1)Excluded from the table above are other investments of $1,115 million, principally policy loans, measured using NAV as a practical expedient.
(2)Excluded from the table above are private equities of $14,405 million, measured using NAV as a practical expedient.
(3)Refer to Note 11 for additional information on Market risk benefits.
 
December 31, 2023Level 1Level 2Level 3Total
(in millions of U.S. dollars)
Assets:
Fixed maturities available-for-sale
U.S. Treasury / Agency$2,911 $679 $— $3,590 
Non-U.S.— 34,472 692 35,164 
Corporate and asset-backed securities— 40,208 2,622 42,830 
Mortgage-backed securities— 22,051 22,058 
Municipal— 2,929 — 2,929 
2,911 100,339 3,321 106,571 
Equity securities3,368 — 87 3,455 
Short-term investments1,915 2,633 4,551 
Other investments (1)
589 4,236 — 4,825 
Securities lending collateral— 1,299 — 1,299 
Investment derivatives54 — — 54 
Derivatives designated as hedging instruments— 136 — 136 
Separate account assets5,482 91 — 5,573 
Total assets measured at fair value (1)(2)
$14,319 $108,734 $3,411 $126,464 
Liabilities:
Investment derivatives$136 $— $— $136 
Derivatives designated as hedging instruments— 128 — 128 
Other derivative instruments37 — 42 
Market risk benefits (3)
— — 771 771 
Total liabilities measured at fair value$173 $133 $771 $1,077 
(1)Excluded from the table above are other investments of $702 million, principally policy loans, measured using NAV as a practical expedient.
(2)Excluded from the table above are private equities of $14,078 million, measured using NAV as a practical expedient.
(3)Refer to Note 11 for additional information on Market risk benefits.
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).

Three Months Ended
September 30, 2024
(in millions of U.S. dollars)
Available-for-Sale Debt SecuritiesEquity
securities
Short-term investments
Non-U.S.Corporate and asset-
backed securities
Mortgage-backed securities
Balance, beginning of period$632 $2,709 $20 $100 $12 
Transfers out of Level 3(1) (14)  
Change in Net Unrealized Gains (Losses) in OCI10 16   (1)
Net Realized Gains (Losses)(1)(10) 7  
Purchases59 316 40 17 6 
Sales(18)(69) (6)(1)
Settlements(42)(184)  (1)
Balance, end of period$639 $2,778 $46 $118 $15 
Net Realized Gains (Losses) Attributable to Changes in Fair Value at the Balance Sheet date$ $(8)$ $6 $ 
Change in Net Unrealized Gains (Losses) included in OCI at the Balance Sheet date$11 $12 $ $ $(1)
Three Months Ended
September 30, 2023
(in millions of U.S. dollars)
Available-for-Sale Debt SecuritiesEquity
securities
Short-term investments
Non-U.S.Corporate and asset-
backed securities
Mortgage-backed securities
Balance, beginning of period$649 $2,524 $10 $86 $
Transfers out of Level 3(22)(10)— — — 
Change in Net Unrealized Gains (Losses) in OCI(6)— — — 
Net Realized Gains (Losses)(2)(4)— — — 
Purchases46 158 16 — 
Sales(17)(40)— (5)(1)
Settlements(15)(65)(1)— — 
Balance, end of period$633 $2,569 $25 $85 $
Net Realized Gains (Losses) Attributable to Changes in Fair Value at the Balance Sheet date$(1)$(4)$— $— $— 
Change in Net Unrealized Gains (Losses) included in OCI at the Balance Sheet date$(8)$$— $— $— 
Nine Months Ended
September 30, 2024
(in millions of U.S. dollars)
Available-for-Sale Debt SecuritiesEquity
securities
Short-term investments
Non-U.S.Corporate and asset-
backed securities
Mortgage-backed securities
Balance, beginning of period$692 $2,622 $7 $87 $3 
Transfers into Level 31 5    
Transfers out of Level 3(7)(3)(14)  
Change in Net Unrealized Gains (Losses) in OCI18 26   (2)
Net Realized Gains (Losses)(5)(15) 6  
Purchases214 785 55 36 22 
Sales(69)(176) (11)(1)
Settlements(205)(466)(2) (7)
Balance, end of period$639 $2,778 $46 $118 $15 
Net Realized Gains (Losses) Attributable to Changes in Fair Value at the Balance Sheet date$(1)$(10)$ $5 $ 
Change in Net Unrealized Gains (Losses) included in OCI at the Balance Sheet date$14 $17 $ $ $(2)
Nine Months Ended
September 30, 2023
(in millions of U.S. dollars)
Available-for-Sale Debt SecuritiesEquity
securities
Short-term investments
Non-U.S.Corporate and asset-
backed securities
Mortgage-backed securities
Balance, beginning of period$564 $2,449 $11 $90 $
Transfers into Level 321 — — — 
Transfers out of Level 3(22)(23)— — — 
Change in Net Unrealized Gains (Losses) in OCI— — (1)
Net Realized Gains (Losses)(3)(7)— (6)— 
Purchases151 481 16 15 
Sales(52)(70)— (14)(3)
Settlements(31)(272)(2)— — 
Balance, end of period$633 $2,569 $25 $85 $
Net Realized Gains (Losses) Attributable to Changes in Fair Value at the Balance Sheet date$(1)$(6)$— $(6)$— 
Change in Net Unrealized Gains (Losses) included in OCI at the Balance Sheet date$$$— $— $— 
Carrying Values And Fair Values Of Financial Instruments Not Measured At Fair Value
The following tables present fair value, by valuation hierarchy, and carrying value of the financial instruments not measured at fair value:

September 30, 2024Fair ValueNet Carrying
Value
(in millions of U.S. dollars)Level 1Level 2Level 3Total
Assets:
Private debt held-for-investment$ $ $2,650 $2,650 $2,619 
Total assets$ $ $2,650 $2,650 $2,619 
Liabilities:
Repurchase agreements$ $3,048 $ $3,048 $3,048 
Short-term debt 1,560  1,560 1,571 
Long-term debt 13,645  13,645 14,560 
Trust preferred securities 377  377 309 
Total liabilities$ $18,630 $ $18,630 $19,488 

December 31, 2023Fair ValueNet Carrying
Value
(in millions of U.S. dollars)Level 1Level 2Level 3Total
Assets:
Private debt held-for-investment$— $— $2,560 $2,560 $2,553 
Total assets$— $— $2,560 $2,560 $2,553 
Liabilities:
Repurchase agreements$— $2,833 $— $2,833 $2,833 
Short-term debt— 1,431 — 1,431 1,460 
Long-term debt— 11,924 — 11,924 13,035 
Trust preferred securities— 365 — 365 308 
Total liabilities$— $16,553 $— $16,553 $17,636