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Reserve for Losses and Loss Adjustment Expenses - Reconciliation of beginning and ending balances of losses and loss adjustment reserves (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Liability for Future Policy Benefits and Unpaid Claims and Claims Adjustment Expense [Abstract]      
Reserve for losses and loss adjustment expenses at beginning of year $ 20,032 $ 17,757 $ 16,514
Unpaid losses and loss adjustment expenses recoverable 6,280 5,599 4,315
Net reserve for losses and loss adjustment expenses at beginning of year 13,752 12,158 12,199
Net incurred losses and loss adjustment expenses relating to losses occurring in:      
Current year 6,784 5,797 4,940
Prior years (538) (769) (355)
Total net incurred losses and loss adjustment expenses 6,246 5,028 4,585
Net losses and loss adjustment expense reserves of acquired business [1] 0 0 104
Retroactive reinsurance transaction [2] 0 0 (444)
Impact of deconsolidation of Somers 0 0 (1,461)
Foreign exchange (gains) losses and other 157 (293) 2
Net paid losses and loss adjustment expenses relating to losses occurring in:      
Current year (1,081) (888) (734)
Prior years (3,012) (2,253) (2,093)
Total net paid losses and loss adjustment expenses (4,093) (3,141) (2,827)
Net reserve for losses and loss adjustment expenses at end of year 16,062 13,752 12,158
Unpaid losses and loss adjustment expenses recoverable 6,690 6,280 5,599
Reserve for losses and loss adjustment expenses at end of year $ 22,752 $ 20,032 $ 17,757
[1] Represents activity related to the Company’s acquisitions in the 2021 period.
[2] See ‘Retroactive Reinsurance Transactions’ section.