Investments - Other investments by type (Details) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Investments [Line Items]
Other investments	$ 3,311	$ 1,691
Bank loans, net
Investments [Line Items]
Other investments	1,584	772
Real estate
Investments [Line Items]
Other investments	822	659
Policy loans
Investments [Line Items]
Other investments	162	181
Agent loans, net
Investments [Line Items]
Other investments	581	0
Derivatives
Investments [Line Items]
Other investments	47	20
Other investments
Investments [Line Items]
Other investments	$ 115	$ 59