Derivative Financial Instruments - Fair Value of Derivative Instruments (Details) $ in Millions	Jun. 30, 2020 USD ($)
Derivative [Line Items]
Total asset derivatives	$ 354
Total liability derivatives	2,987
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities
Derivative [Line Items]
Total liability derivatives	35
Call options
Derivative [Line Items]
Total asset derivatives	332
Futures contracts | Derivative Instruments
Derivative [Line Items]
Total asset derivatives	1
Other derivatives and embedded derivatives | Investment in unconsolidated affiliates
Derivative [Line Items]
Total asset derivatives	21
FIA embedded derivative | Contractholder funds
Derivative [Line Items]
Total liability derivatives	$ 2,952