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Fair Value (Tables)
9 Months Ended
Sep. 30, 2024
Fair Value Disclosures [Abstract]  
Fair value hierarchy
The following table presents the Company’s financial assets and liabilities measured at fair value by level at September 30, 2024:
  Estimated Fair Value Measurements Using:
 Estimated
Fair
Value
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Assets measured at fair value:    
Available for sale securities:    
Fixed maturities:    
Corporate bonds$13,996 $$13,853 $141 
U.S. government and government agencies5,863 5,850 13 — 
Asset backed securities2,989 — 2,989 — 
Non-U.S. government securities2,853 — 2,853 — 
Commercial mortgage backed securities1,146 — 1,146 — 
Residential mortgage backed securities1,313 — 1,313 — 
Municipal bonds274 — 274 — 
Total28,434 5,852 22,441 141 
Short-term investments3,341 3,081 163 97 
Equity securities, at fair value1,623 1,590 27 
Derivative instruments (2)147 — 147 — 
Residential mortgage loans13 — 13 — 
Fair value option:
Corporate bonds1,085 — 1,085 — 
Non-U.S. government bonds— — 
U.S. government and government agencies— — 
Short-term investments61 43 15 
Equity securities— 
Other investments703 — 413 290 
Other investments measured at net asset value (1)1,393 
Total3,261 10 1,549 309 
Total assets measured at fair value$36,819 $10,533 $24,340 $553 
Liabilities measured at fair value:    
Other liabilities$(43)$— $— $(43)
Derivative instruments (2)(81)— (81)— 
Total liabilities measured at fair value$(124)$— $(81)$(43)

(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
(2)    See note 10.
The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2023:
  Estimated Fair Value Measurements Using:
 Estimated
Fair
Value
Quoted Prices in
Active Markets
for Identical
Assets
(Level 1)
Significant
Other
Observable
Inputs
(Level 2)
Significant
Unobservable
Inputs
(Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities:
Corporate bonds$10,855 $— $10,708 $147 
U.S. government and government agencies5,814 5,792 22 — 
Asset backed securities2,250 — 2,250 — 
Non-U.S. government securities2,062 — 2,062 — 
Commercial mortgage backed securities1,213 — 1,213 — 
Residential mortgage backed securities1,103 — 1,103 — 
Municipal bonds256 — 256 — 
Total23,553 5,792 17,614 147 
Short-term investments2,063 1,786 193 84 
Equity securities, at fair value1,186 1,151 30 
Derivative instruments (2)197 — 197 — 
Residential mortgage loans— — 
Fair value option:
Corporate bonds662 — 662 — 
Non-U.S. government bonds— — 
Asset backed securities— — 
U.S. government and government agencies13 13 — — 
Short-term investments21 — 11 10 
Equity securities— 
Other investments316 — 210 106 
Other investments measured at net asset value (1)1,461 
Total2,488 16 891 120 
Total assets measured at fair value$29,489 $8,745 $18,927 $356 
Liabilities measured at fair value:
Other liabilities$(22)$— $— $(22)
Derivative instruments (2)(119)— (119)— 
Total liabilities measured at fair value$(141)$— $(119)$(22)

(1)    In accordance with applicable accounting guidance, certain investments that are measured at fair value using the net asset value per share (or its equivalent) practical expedient have not been classified in the fair value hierarchy. The fair value amounts presented in this table are intended to permit reconciliation of the fair value hierarchy to the amounts presented in the consolidated balance sheets.
(2)    See note 10.
Rollforward of Level 3 investments
The following table presents a reconciliation of the beginning and ending balances for all financial assets and liabilities measured at fair value on a recurring basis using Level 3 inputs:
AssetsLiabilities
sAvailable For SaleFair Value OptionFair Value
 Corporate
Bonds
Short-term
Investments
Other
Investments
Short-term
Investments
Equity
Securities
Equity
Securities
Other Liabilities
Three Months Ended September 30, 2024  
Balance at beginning of period$160 $97 $144 $14 $$$(35)
Total gains or (losses) (realized/unrealized)
Included in earnings (1)— — — — — — (1)
Included in other comprehensive income— — — — — — — 
Purchases, issuances, sales and settlements
Purchases— — 39 — — — 
Issuances (2)— — — — — — (9)
Sales— — (2)— — — — 
Settlements(19)— (14)(4)— — 
Transfers in and/or out of Level 3— — 123 — — — — 
Balance at end of period$141 $97 $290 $15 $$$(43)
Three Months Ended September 30, 2023  
Balance at beginning of period$100 $— $86 $— $$$(19)
Total gains or (losses) (realized/unrealized)
Included in earnings (1)— — — — — — — 
Included in other comprehensive income(1)— — — — — — 
Purchases, issuances, sales and settlements
Purchases25 — 29 — — — 
Issuances— — — — — — (4)
Sales — — (6)— — — — 
Settlements— — (9)— — — 
Transfers in and/or out of Level 3— — — — — — — 
Balance at end of period$124 $— $100 $$$$(21)
Nine Months Ended September 30, 2024  
Balance at beginning of year$147 $84 $106 $10 $$$(22)
Total gains or (losses) (realized/unrealized)
Included in earnings (1)— — (4)— — — (1)
Included in other comprehensive income— — — — — 
Purchases, issuances, sales and settlements
Purchases98 12 99 15 — — 
Issuances (2)— — — — — — (22)
Sales — — (4)— — — — 
Settlements(106)— (30)(10)— — 
Transfers in and/or out of Level 3— — 123 — — — — 
Balance at end of period$141 $97 $290 $15 $$$(43)
Nine Months Ended September 30, 2023  
Balance at beginning of year$121 $— $33 $— $$$(14)
Total gains or (losses) (realized/unrealized)
Included in earnings (1)— (1)— — — — 
Included in other comprehensive income(1)— — — — — — 
Purchases, issuances, sales and settlements
Purchases68 — 87 — — 
Issuances— — — — — — (9)
Sales— — (10)— — — — 
Settlements(65)— (9)— — — 
Transfers in and/or out of Level 3— — — — — — — 
Balance at end of period$124 $— $100 $$$$(21)
(1)    Gains or losses were included in net realized gains (losses).