Reinsurance and Indemnification - Premiums earned and life premiums and contract charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Property and casualty insurance premiums
Reinsurance
Property and casualty insurance premiums earned	$ (479)	$ (442)	$ (1,362)	$ (1,488)
Accident and health insurance premiums and contract charges
Reinsurance
Accident and health insurance premiums and contract charges	$ (12)	$ (17)	$ (29)	$ (65)