Fair Value Measurements (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Percent of fixed maturities for which a pricing service estimates fair value	99.00%	99.00%
Fair value of the fixed maturities for which the Company used an internal pricing matrix	$ 96	$ 82
Fair value of the fixed maturities for which the Company received a broker quote	19	104
Estimated fair value of put/call option	$ 10	$ 10