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Investment Information - Net realized gains and losses (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Available for sale securities:        
Available for sale securities, gross gains on investment sales $ 22 $ 15 $ 39 $ 35
Available for sale securities, gross losses on investment sales (169) (57) (280) (165)
Equity securities, at fair value:        
Net realized gains (losses) on sales during the period 17 17 36 82
Net unrealized gains (losses) on equity securities still held at reporting date 25 (106) 63 (282)
Allowance for credit losses:        
Allowance for credit losses - investments related (7) (25) (23) (57)
Allowance for credit losses - underwriting related (1) 1 (1) (3)
Derivative instruments [1] (15) (46) 41 (70)
Other 2 0 0 (3)
Net realized gains (losses) (123) (267) (106) (559)
Fixed maturities        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option (2) (39) 4 (70)
Other investments        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option 5 (23) 14 (19)
Equity securities        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option 0 (2) 1 (5)
Short-term investments        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option $ 0 $ (2) $ 0 $ (2)
[1] See note 9 for information on the Company’s derivative instruments.