Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Deferred tax assets:
Unearned premium reserves, net	$ 76	$ 98
Investment basis differences	48	49
Foreign tax credit	36	36
Net operating loss	32	34
Deferred compensation	26	25
Alternative minimum tax credit	12	20
Other	24	35
Total deferred income tax assets	254	297
Deferred tax liabilities:
Unrealized appreciation on investments	86	54
Public debt	44	50
Market discount	11	31
DAC	33	23
Unrealized gains on CCS	11	16
Loss and LAE reserve	29	7
Other	21	12
Total deferred income tax liabilities	235	193
Less: Valuation allowance	36	36
Net deferred income tax liabilities	$ (17)
Net deferred income tax asset		$ 68