Reinsurance - Effect of Reinsurance on Statement of Operations (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Premiums Written:
Direct	$ 64	$ 39
Assumed	0	0
Ceded	0	15
Net	64	54
Premiums Earned:
Direct	94	105
Assumed	10	15
Ceded	(1)	(2)
Net	103	118
Loss and LAE:
Direct	8	54
Assumed	12	1
Ceded	0	(9)
Net	$ 20	$ 46