Reinsurance and Indemnification - Premiums earned and life premiums and contract charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Property and casualty insurance premiums
Reinsurance
Property and casualty insurance premiums earned	$ (456)	$ (538)	$ (883)	$ (1,046)
Life premiums
Reinsurance
Accident and health insurance premiums and contract charges	$ (9)	$ (24)	$ (17)	$ (48)