Discontinued Operations - Financial Results of Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating expenses:
Loss from discontinued operations, net of income taxes	$ (2)	$ (347)	$ (2)	$ (170)
Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net revenues	0	2,535	0	4,922
Cost of net revenues	0	1,123	0	2,162
Gross profit	0	1,412	0	2,760
Operating expenses:
Sales and marketing	0	282	0	557
Product development	0	284	0	548
General and administrative	4	394	2	757
Provision for transaction and loan losses	0	198	0	393
Amortization of acquired intangible assets	0	49	0	97
Goodwill impairment	0	786	0	786
Total operating expenses	4	1,993	2	3,138
Loss from operations of discontinued operations	(4)	(581)	(2)	(378)
Interest and other, net	0	6	0	4
Loss from discontinued operations before income taxes	(4)	(575)	(2)	(374)
Income tax benefit	2	228	0	204
Loss from discontinued operations, net of income taxes	$ (2)	$ (347)	$ (2)	$ (170)