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Fair Value (Tables)
6 Months Ended
Jun. 30, 2023
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 June 30, 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$9,977 $— $9,877 $100 
Residential mortgage backed securities860 — 860 — 
Municipal bonds306 — 306 — 
Commercial mortgage backed securities1,082 — 1,082 — 
U.S. government and government agencies4,529 4,507 22 — 
Non-U.S. government securities2,277 — 2,277 — 
Asset backed securities2,403 — 2,403 — 
Total21,434 4,507 16,827 100 
Short-term investments1,702 1,599 103 — 
Equity securities, at fair value911 876 30 
Derivative instruments (2)125 — 125 — 
Residential mortgage loans— — 
Fair value option:
Corporate bonds639 — 639 — 
Non-U.S. government bonds10 — 10 — 
Asset backed securities— — 
U.S. government and government agencies— — 
Short-term investments— 
Equity securities— 
Other investments313 — 227 86 
Other investments measured at net asset value (1)859 
Total1,846 12 885 90 
Total assets measured at fair value$26,020 $6,994 $17,972 $195 
Liabilities measured at fair value:    
Other liabilities$(19)$— $— $(19)
Derivative instruments (2)(62)— (62)— 
Total liabilities measured at fair value$(81)$— $(62)$(19)

(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 9.
The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2022:
  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$8,020 $— $7,899 $121 
Residential mortgage backed securities795 — 795 — 
Municipal bonds419 — 419 — 
Commercial mortgage backed securities1,047 — 1,047 — 
U.S. government and government agencies5,162 5,145 17 — 
Non-U.S. government securities2,313 — 2,313 — 
Asset backed securities1,927 — 1,927 — 
Total19,683 5,145 14,417 121 
Short-term investments1,332 1,198 134 — 
Equity securities, at fair value860 829 28 
Derivative instruments (2)149 — 149 — 
Residential mortgage loans— — 
Fair value option:
Corporate bonds543 — 543 — 
Non-U.S. government bonds— — 
Asset backed securities— — 
U.S. government and government agencies— — 
Short-term investments33 32 — 
Equity securities14 10 — 
Other investments196 — 163 33 
Other investments measured at net asset value (1)847 
Total1,644 16 744 37 
Total assets measured at fair value$23,670 $7,188 $15,474 $161 
Liabilities measured at fair value:
Other liabilities$(14)$— $— $(14)
Derivative instruments (2)(76)— (76)— 
Total liabilities measured at fair value$(90)$— $(76)$(14)

(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 9.
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
 Structured Securities (1)Corporate
Bonds
Other
Investments
Equity
Securities
Equity
Securities
Other Liabilities
Three Months Ended June 30, 2023  
Balance at beginning of period$— $69 $46 $$$(14)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)— — — — — — 
Included in other comprehensive income— — — — — — 
Purchases, issuances, sales and settlements
Purchases— 43 40 — — — 
Issuances— — — — — (5)
Sales— — — — — — 
Settlements— (12)— — — — 
Transfers in and/or out of Level 3— — — — — — 
Balance at end of period$— $100 $86 $$$(19)
Three Months Ended June 30, 2022  
Balance at beginning of period$$$23 $$$(18)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)— — — — — — 
Included in other comprehensive income— — — — — 
Purchases, issuances, sales and settlements
Purchases— — 11 — — — 
Issuances— — — — — — 
Sales — — — — — — 
Settlements— — — — — — 
Transfers in and/or out of Level 3— — — — — — 
Balance at end of period$$$34 $$$(17)
Six Months Ended June 30, 2023  
Balance at beginning of year$— $121 $33 $$$(14)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)— (1)— — — 
Included in other comprehensive income— — — — — — 
Purchases, issuances, sales and settlements
Purchases— 43 58 — — 
Issuances— — — — — (5)
Sales — — (4)— — — 
Settlements— (65)— — — — 
Transfers in and/or out of Level 3— — — — — — 
Balance at end of period$— $100 $86 $$$(19)
Six Months Ended June 30, 2022  
Balance at beginning of year$$— $28 $$$(17)
Total gains or (losses) (realized/unrealized)
Included in earnings (2)— — — — — — 
Included in other comprehensive income— — — — — — 
Purchases, issuances, sales and settlements
Purchases— — 11 — — — 
Issuances— — — — — — 
Sales— — (2)— — — 
Settlements— — (3)— — — 
Transfers in and/or out of Level 3— — — — — 
Balance at end of period$$$34 $$$(17)
(1)    Includes asset backed securities, residential mortgage backed securities and commercial mortgage backed securities.
(2)    Gains or losses were included in net realized gains (losses).