Reinsurance - Effect of Reinsurance on Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Premiums Written:
Direct	$ 39	$ 73
Assumed	0	0
Ceded	15	(11)
Net	54	62
Premiums Earned:
Direct	105	143
Assumed	15	5
Ceded	(2)	(3)
Net	118	145
Loss and LAE:
Direct	54	(14)
Assumed	1	(3)
Ceded	(9)	(1)
Net	$ 46	$ (18)