Guaranteed Benefit Features - Universal and Variable Life Contracts (Details) - Variable Life and Universal Life - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Secondary Guarantees
Net Amount at Risk by Product and Guarantee [Line Items]
Account value (general and separate account)	$ 1,397	$ 1,432
Net amount at risk, net of reinsurance	$ 3,978	$ 4,144
Weighted average attained age	72 years	72 years
Paid-up Guarantees
Net Amount at Risk by Product and Guarantee [Line Items]
Account value (general and separate account)	$ 0	$ 0
Net amount at risk, net of reinsurance	$ 0	$ 0