CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 33	$ 108	$ 366	$ 320
Other comprehensive (loss) income
Change in unrealized holding (losses) gains on available-for-sale securities, net of tax benefit (expense) of $22, $32, $66 and $(48), respectively	(40)	(59)	(123)	89
Reclassification adjustment for gross losses (gains) included in net income, net of tax (expense) benefit of $0, $1, $4 and $8, respectively	1	(4)	(6)	(15)
Other comprehensive (loss) income	(39)	(63)	(129)	74
Comprehensive (loss) income	(6)	45	237	394
Less: Comprehensive (loss) income attributable to noncontrolling interest in consolidated entity – Exchange	(55)	(1)	95	249
Total comprehensive income – Indemnity	$ 49	$ 46	$ 142	$ 145