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Reinsurance - Insurance Revenue (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Premiums Earned
Direct	$ 18,867	$ 17,796	$ 16,132
Assumed	696	927	1,988
Ceded	(1,381)	(1,269)	(1,027)
Premiums Earned, Net	17,999	17,288	16,923
Property and Casualty Insurance Products
Premiums Written
Direct	13,696	12,537	12,190
Assumed	631	577	371
Ceded	(1,378)	(1,209)	(978)
Net	12,949	11,905	11,583
Premiums Earned
Direct	13,204	12,551	12,010
Assumed	568	540	416
Ceded	(1,277)	(1,173)	(936)
Premiums Earned, Net	12,495	11,918	11,490
Group Insurance Policy [Member]
Premiums Earned
Direct	5,663	5,245	4,122
Assumed	128	387	1,572
Ceded	(104)	(96)	(91)
Premiums Earned, Net	$ 5,687	$ 5,536	$ 5,603

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