Investments - Credit Quality of RMLs (Details) - USD ($) $ in Millions	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Credit Quality Indicator [Line Items]
Loans, net	$ 1,749	$ 0
Performing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	$ 1,142
% of Total	95.00%
Non-performing
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	$ 59
% of Total	5.00%
Residential Portfolio Segment | Over 90 days past due
Financing Receivable, Credit Quality Indicator [Line Items]
Carrying Value	$ 1,201
Allowance for expected loan loss	26
Loans, net	$ 1,175
% of Total	100.00%
Allowance % of Total	0.00%