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Investment Information - Net realized gains and losses (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Available for sale securities:      
Available for sale securities, gross gains on investment sales $ 259 $ 116 $ 81
Available for sale securities, gross losses on investment sales (354) (547) (317)
Equity securities, at fair value :      
Net realized gains (losses) on securities sold 62 61 75
Net unrealized gains (losses) on equity securities still held at reporting date 108 88 (267)
Allowance for credit losses:      
Allowance for credit losses - investment related 0 3 (44)
Allowance for credit losses - underwriting related 5 (1) (13)
Derivative instruments 8 59 (75)
Other [1] 251 10 (4)
Net realized gains (losses) $ 197 $ (165) $ (663)
Derivative, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net realized gains (losses) Net realized gains (losses) Net realized gains (losses)
Fixed maturities      
Available for sale securities:      
Change in fair value of assets and liabilities accounted for using the fair value option $ 3 $ 18 $ (71)
Other investments      
Available for sale securities:      
Change in fair value of assets and liabilities accounted for using the fair value option (144) 27 (21)
Equity securities      
Available for sale securities:      
Change in fair value of assets and liabilities accounted for using the fair value option (1) 1 (4)
Short-term investments      
Available for sale securities:      
Change in fair value of assets and liabilities accounted for using the fair value option $ 0 $ 0 $ (3)
[1] Amounts in the 2024 period include benefits from the sale of Castel Underwriting Agencies Limited and the acquisition of RMIC.