CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income	$ 267	$ 184	$ 734	$ 500
Other comprehensive (loss) income
Change in unrealized holding (losses) gains on available-for-sale securities, net of tax (benefit) expense of $(12), $59, $(123), and $112, respectively	(23)	110	(229)	208
Reclassification adjustment for gross losses (gains) included in net income, net of tax (benefit) expense of $(12), $5, $(5), and $13, respectively	21	(11)	8	(25)
Other comprehensive (loss) income	(2)	99	(221)	183
Comprehensive income	265	283	513	683
Less: Comprehensive income attributable to noncontrolling interest in consolidated entity – Exchange	221	230	393	549
Total comprehensive income – Indemnity	$ 44	$ 53	$ 120	$ 134