Investments - Rollforward of credit loss allowance for bank loans (Details) - Bank loans, net - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	$ (56)	$ (52)	$ (61)	$ (67)
Net increases related to credit losses	(2)	(14)	(18)	(10)
Reduction of allowance related to sales	6	2	27	13
Write-offs	0	0	0	0
Ending balance	$ (52)	(64)	$ (52)	(64)
Discontinued Operations, Held-for-sale
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Ending balance		$ (7)		$ (7)