Income Taxes - Components of Net Deferred Tax Assets (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets:
Unrealized losses on credit derivative financial instruments, net	$ 33	$ 224
Unearned premium reserves, net	254	55
Loss and LAE reserve	64	66
Tax and loss bonds	39	39
Alternative minimum tax credit	55	57
Foreign tax credit	11	0
FG VIEs	0	13
DAC	27	35
Investment basis difference	86	104
Deferred compensation	41	38
Other	17	19
Total deferred income tax assets	627	650
Deferred tax liabilities:
Contingency reserves	64	64
Public debt	94	96
Unrealized appreciation on investments	108	159
Unrealized gains on CCS	22	22
Market discount	21	28
FG VIEs	13	0
Other	18	21
Total deferred income tax liabilities	340	390
Less: Valuation allowance	11	0
Net deferred income tax asset	$ 276	$ 260