Discontinued Operations (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Disposal Group, Including Discontinued Operation, Income Statement Disclosures [Abstract]
Net revenues	$ 0	$ 0	$ 0	$ 0
Cost of net revenues	0	0	0	0
Gross profit	0	0	0	0
Sales and marketing	0	0	0	0
Product development	0	0	0	0
General and administrative	0	4	0	2
Provision for transaction and loan losses	0	0	0	0
Amortization of acquired intangible assets	0	0	0	0
Goodwill impairment	0	0	0	0
Total operating expenses	0	4	0	2
Loss from operations of discontinued operations	0	(4)	0	(2)
Interest and other, net	0	0	0	0
Loss from discontinued operations before income taxes	0	(4)	0	(2)
Income tax benefit	0	2	0	0
Loss from discontinued operations, net of income taxes	$ 0	$ (2)	$ 0	$ (2)