Investments - Other investments by type (Details) - USD ($) $ in Millions	Sep. 30, 2021	Dec. 31, 2020
Investments [Line Items]
Other investments	$ 3,286	$ 1,691
Bank loans, net
Investments [Line Items]
Other investments	1,592	772
Real estate
Investments [Line Items]
Other investments	849	659
Agent loans, net
Investments [Line Items]
Other investments	567	0
Policy loans
Investments [Line Items]
Other investments	144	181
Derivatives
Investments [Line Items]
Other investments	20	20
Other investments
Investments [Line Items]
Other investments	$ 114	$ 59