Discontinued Operations - Paypal (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 Means Other than Sale, Spinoff | PayPal
Financial Results
Net revenues									4,793	7,895	6,640
Cost of net revenues									1,918	3,140	2,696
Gross profit									2,875	4,755	3,944
Operating expenses:
Sales and marketing									534	1,027	794
Product development									527	879	712
General and administrative									741	892	724
Provision for transaction and loan losses									418	688	551
Amortization of acquired intangible assets									30	53	41
Total operating expenses									2,250	3,539	2,822
Income from operations of discontinued operations									625	1,216	1,122
Interest and other, net									1	(7)	(7)
Income from discontinued operations before income taxes									626	1,209	1,115
Provision for income taxes									(110)	(185)	(189)
Income from discontinued operations, net of income taxes									$ 516	1,024	$ 926
Carrying amounts of assets included as part of discontinued operations:
Cash and cash equivalents					2,194					2,194
Short-term investments					39					39
Accounts receivable, net					51					51
Loans and interest receivable, net					3,600					3,600
Funds receivable and customer accounts					10,545					10,545
Other current assets					366					366
Current assets classified as discontinued operations					16,795					16,795
Long-term investments					31					31
Property and equipment, net					1,113					1,113
Goodwill					3,136					3,136
Intangible assets, net					172					172
Other assets					54					54
Long-term assets classified as discontinued operations					4,506					4,506
Total assets classified as discontinued operations in the consolidated balance sheet					21,301					21,301
Carrying amounts of liabilities included as part of discontinued operations:
Accounts payable					115					115
Funds receivable and customer accounts					10,545					10,545
Accrued expenses and other current liabilities					1,448					1,448
Income taxes payable					29					29
Current liabilities classified as discontinued operations					12,137					12,137
Deferred and other tax liabilities, net					197					197
Other liabilities					46					46
Long-term liabilities classified as discontinued operations					243					243
Total liabilities classified as discontinued operations in the consolidated balance sheet					$ 12,380					$ 12,380