CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 136	$ 109
Other comprehensive income
Change in unrealized holding gains on available-for-sale securities, net of tax expense of $29 and $43, respectively	53	80
Reclassification adjustment for gross gains included in net income, net of tax benefit of $2 and $5, respectively	(3)	(8)
Other comprehensive income	50	72
Comprehensive income	186	181
Less: Comprehensive income attributable to noncontrolling interest in consolidated entity – Exchange	147	132
Total comprehensive income – Indemnity	$ 39	$ 49