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Reinsurance Reinsurance - Premiums and future policy benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Premiums
Direct	$ 11,373	$ 13,989	$ 5,691
Reinsurance assumed	377	388	413
Reinsurance ceded	(112)	(115)	(141)
Total premiums	11,638	14,262	5,963
Future policy and other policy benefits
Direct	12,018	15,482	7,016
Reinsurance assumed	398	503	522
Reinsurance ceded	(106)	(251)	(351)
Total future policy and other policy benefits	$ 12,310	$ 15,734	$ 7,187

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