Investments - Other investments by type (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Investments [Line Items]
Other investments	$ 3,042	$ 1,691
Bank loans, net
Investments [Line Items]
Other investments	1,260	772
Real estate
Investments [Line Items]
Other investments	871	659
Policy loans
Investments [Line Items]
Other investments	164	181
Agent loans, net
Investments [Line Items]
Other investments	607	0
Derivatives
Investments [Line Items]
Other investments	22	20
Other investments
Investments [Line Items]
Other investments	$ 118	$ 59