Receivables (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Receivables [Abstract]
Reinsurance (Note 17)	$ 6,072	$ 5,434
Insurance	3,697	3,470
Receivable from brokers	50	64
Accrued investment income	458	446
Income taxes	9	21
Other, primarily customer accounts	284	277
Total	10,570	9,712
Less: allowance for doubtful accounts on reinsurance receivables	21	22
Less: allowance for other doubtful accounts	27	30
Receivables	$ 10,522	$ 9,660