Commitments and Contingencies - Schedule of Investment Commitments (Details) - Commitment to Invest $ in Millions	Jun. 30, 2020 USD ($)
Other Commitments [Line Items]
Unfunded investment commitment	$ 1,599
Investment in unconsolidated affiliates
Other Commitments [Line Items]
Unfunded investment commitment	1,264
Fixed maturity securities, available-for-sale
Other Commitments [Line Items]
Unfunded investment commitment	177
Other assets
Other Commitments [Line Items]
Unfunded investment commitment	145
Residential mortgage loans
Other Commitments [Line Items]
Unfunded investment commitment	$ 13