Investments - Other investments by type (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Schedule of Investments [Line Items]
Other, net	$ 3,918	$ 4,005
Bank loans, net
Schedule of Investments [Line Items]
Other, net	1,118	1,204
Real estate
Schedule of Investments [Line Items]
Other, net	986	1,005
Policy loans
Schedule of Investments [Line Items]
Other, net	878	894
Agent loans, net
Schedule of Investments [Line Items]
Other, net	649	666
Derivatives and other
Schedule of Investments [Line Items]
Other, net	$ 287	$ 236