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Reinsurance - Insurance Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums Earned
Direct	$ 20,316	$ 18,867	$ 17,796
Assumed	829	696	927
Ceded	(1,568)	(1,381)	(1,269)
Premiums Earned, Net	19,390	17,999	17,288
Property and Casualty Insurance Products
Premiums Written
Direct	14,891	13,696	12,537
Assumed	718	631	577
Ceded	(1,490)	(1,378)	(1,209)
Net	14,119	12,949	11,905
Premiums Earned
Direct	14,328	13,204	12,551
Assumed	654	568	540
Ceded	(1,462)	(1,277)	(1,173)
Premiums Earned, Net	13,520	12,495	11,918
Group Insurance Policy [Member]
Premiums Earned
Direct	5,988	5,663	5,245
Assumed	175	128	387
Ceded	(106)	(104)	(96)
Premiums Earned, Net	$ 6,057	$ 5,687	$ 5,536

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