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Reinsurance - Insurance Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Premiums Earned
Direct	$ 23,491	$ 21,959	$ 20,316
Assumed	1,167	1,000	829
Ceded	(1,869)	(1,716)	(1,568)
Earned premiums and fee income	23,940	22,326	20,739
Premiums Earned, Net	22,567	21,026	19,390
Property and Casualty Insurance Products
Premiums Written
Direct	17,622	16,144	14,891
Assumed	1,102	975	718
Ceded	(1,775)	(1,642)	(1,490)
Net	16,949	15,477	14,119
Premiums Earned
Direct	16,915	15,514	14,328
Assumed	1,001	826	654
Ceded	(1,742)	(1,612)	(1,462)
Premiums Earned, Net	16,174	14,728	13,520
Group Insurance Policy [Member]
Premiums Earned
Assumed	166	174	175
Ceded	(127)	(104)	(106)
Earned premiums and fee income	6,615	6,515	6,057
Direct earned premiums, fee income and other considerations	$ 6,576	$ 6,445	$ 5,988

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