Derivative Financial Instruments - Carrying Amounts of Derivative Instruments (Details) $ in Millions	Dec. 31, 2020 USD ($)
Derivative [Line Items]
Total asset derivatives	$ 575
Total liability derivatives	3,505
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities
Derivative [Line Items]
Total liability derivatives	101
Call options
Derivative [Line Items]
Total asset derivatives	548
Other embedded derivatives | Other invested assets
Derivative [Line Items]
Total asset derivatives	27
FIA embedded derivative | Contractholder funds
Derivative [Line Items]
Total liability derivatives	$ 3,404