Derivative Financial Instruments - Schedule of Change in Fair Value of Derivative Instruments (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative [Line Items]
Change in fair value of reinsurance related embedded derivatives	$ (21)	$ 0	$ (21)	$ 0
Change In Fair Value Of Derivatives	(6)
Call options | Net investment (losses) gains
Derivative [Line Items]
Change in fair value of reinsurance related embedded derivatives	12
Futures contracts | Net investment (losses) gains
Derivative [Line Items]
Change in fair value of reinsurance related embedded derivatives	2
Foreign currency forward | Net investment (losses) gains
Derivative [Line Items]
Change in fair value of reinsurance related embedded derivatives	0
Other derivatives and embedded derivatives | Net investment (losses) gains
Derivative [Line Items]
Change in fair value of reinsurance related embedded derivatives	1
Reinsurance related embedded derivatives, included in accounts payable and accrued liabilities | Net investment (losses) gains
Derivative [Line Items]
Change in fair value of reinsurance related embedded derivatives	(21)
FIA embedded derivative
Derivative [Line Items]
Change in fair value of reinsurance related embedded derivatives	$ 100