Investments - Schedule of Residential Mortgage Loan Investment (Details) $ in Millions	Jun. 30, 2020 USD ($)
Total Mortgage Loans
Unpaid Principal Balance	$ 1,191
% of Total	100.00%
California
Unpaid Principal Balance	$ 216
% of Total	18.00%
Florida
Unpaid Principal Balance	$ 198
% of Total	17.00%
New Jersey
Unpaid Principal Balance	$ 113
% of Total	9.00%
All Other States
Unpaid Principal Balance	$ 664
% of Total	56.00%