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Investment Information - Net realized gains and losses (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Available for sale securities:        
Available for sale securities, gross gains on investment sales $ 12 $ 18 $ 51 $ 53
Available for sale securities, gross losses on investment sales (116) (74) (396) (239)
Equity securities, at fair value:        
Net realized gains (losses) on sales during the period 14 (6) 50 76
Net unrealized gains (losses) on equity securities still held at reporting date (46) (36) 17 (318)
Allowance for credit losses:        
Allowance for credit losses - investments related 0 9 (23) (48)
Allowance for credit losses - underwriting related (1) (4) (2) (7)
Derivative instruments [1] (102) (48) (61) (118)
Other 4 (4) 4 (7)
Net realized gains (losses) (248) (184) (354) (743)
Fixed maturities        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option (16) (19) (12) (89)
Other investments        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option 3 (18) 17 (37)
Equity securities        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option 0 (1) 1 (6)
Short-term investments        
Available for sale securities:        
Change in fair value of assets and liabilities accounted for using the fair value option $ 0 $ (1) $ 0 $ (3)
[1] See note 9 for information on the Company’s derivative instruments.