Fair Value Measurements (Details) - USD ($) $ in Millions	Jun. 30, 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	$ 78	$ 82
Fair value of the fixed maturities for which the Company received a broker quote	32	104
Estimated fair value of put/call option	$ 7	$ 10