Discontinued Operations - Enterprise (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating expenses:
Income from discontinued operations, net of income taxes	$ (46)	$ (6)	$ (347)	$ 177	$ 294	$ 164	$ 218	$ 235	$ (222)	$ 911	$ 789
Carrying amounts of assets included as part of discontinued operations:
Cash and cash equivalents	0				2,194				0	2,194	1,599
Current assets classified as discontinued operations	0				17,048				0	17,048
Long-term assets classified as discontinued operations	0				6,368				0	6,368
Carrying amounts of liabilities included as part of discontinued operations:
Current liabilities classified as discontinued operations	0				12,511				0	12,511
Long-term liabilities classified as discontinued operations	$ 0				317				0	317
Discontinued Operations, Disposed of By Sale | Enterprise
Financial Results
Net revenues									904	1,217	1,150
Cost of net revenues									654	929	848
Gross profit									250	288	302
Operating expenses:
Sales and marketing									95	118	122
Product development									91	138	141
General and administrative									118	62	99
Provision for transaction and loan losses									12	8	4
Amortization of acquired intangible assets									70	140	141
Goodwill impairment			$ 786						786	0	0
Total operating expenses									1,172	466	507
Income from operations of discontinued operations									(922)	(178)	(205)
Interest and other, net									1	(15)	(15)
Pretax loss on disposal of the discontinued operation									(35)	0	0
Income from discontinued operations before income taxes									(956)	(193)	(220)
Income tax benefit									218	80	83
Income from discontinued operations, net of income taxes									$ (738)	(113)	$ (137)
Carrying amounts of assets included as part of discontinued operations:
Cash and cash equivalents					29					29
Short-term investments					1					1
Accounts receivable, net					146					146
Other current assets					77					77
Current assets classified as discontinued operations					253					253
Long-term investments					10					10
Property and equipment, net					303					303
Goodwill					1,287					1,287
Intangible assets, net					259					259
Other assets					3					3
Long-term assets classified as discontinued operations					1,862					1,862
Total assets classified as discontinued operations in the consolidated balance sheet					2,115					2,115
Carrying amounts of liabilities included as part of discontinued operations:
Accounts payable					179					179
Accrued expenses and other current liabilities					115					115
Deferred revenue					80					80
Current liabilities classified as discontinued operations					374					374
Deferred and other tax liabilities, net					73					73
Other liabilities					1					1
Long-term liabilities classified as discontinued operations					74					74
Total liabilities classified as discontinued operations in the consolidated balance sheet					$ 448					$ 448