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Claim and Claim Adjustment Expense Reserves (Reconciliation of claim and claim adjustment expense reserves) (Details) - USD ($)
$ in Millions
 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Reserves, beginning of year:    
Gross $ 23,304 $ 22,120
Ceded 5,141 5,191
Net reserves, beginning of year 18,163 16,929
Net incurred claim and claim adjustment expenses:    
Provision for insured events of current year 3,039 2,746
Increase (decrease) in provision for insured events of prior years 19 37
Amortization of discount 20 22
Total net incurred 3,078 2,805
Net payments attributable to:    
Current year events (308) (287)
Prior year events (2,259) (2,014)
Total net payments (2,567) (2,301)
Foreign currency translation adjustment and other (58) 57
Net reserves, end of period 18,616 17,490
Ceded reserves, end of period 5,358 5,312
Gross reserves, end of period $ 23,974 $ 22,802