CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash flows from operating activities
Net income	$ 3,688	$ 2,940	$ 1,500
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	1,945	1,243	1,011
Lease abandonment	0	(31)	117
Share-based compensation	2,960	1,786	906
Deferred income taxes	(795)	(210)	(37)
Tax benefit from share-based award activity	1,721	1,853	602
Excess tax benefit from share-based award activity	(1,721)	(1,869)	(609)
Other	17	7	56
Changes in assets and liabilities:
Accounts receivable	(973)	(610)	(378)
Prepaid expenses and other current assets	(144)	(123)	355
Other assets	(3)	(216)	(142)
Accounts payable	18	31	26
Partners payable	17	(28)	12
Accrued expenses and other current liabilities	513	328	(38)
Deferred revenue and deposits	(9)	10	8
Other liabilities	1,365	346	833
Net cash provided by operating activities	8,599	5,457	4,222
Cash flows from investing activities
Purchases of property and equipment	(2,523)	(1,831)	(1,362)
Purchases of marketable securities	(15,938)	(9,104)	(7,433)
Sales of marketable securities	6,928	8,438	2,988
Maturities of marketable securities	2,310	1,909	3,563
Acquisitions of businesses, net of cash acquired, and purchases of intangible assets	(313)	(4,975)	(368)
Change in restricted cash and deposits	102	(348)	(11)
Other investing activities, net	0	(2)	(1)
Net cash used in investing activities	(9,434)	(5,913)	(2,624)
Cash flows from financing activities
Net proceeds from issuance of common stock	0	0	1,478
Taxes paid related to net share settlement	(20)	(73)	(889)
Proceeds from exercise of stock options	0	18	26
Repayment of long-term debt	0	0	(1,500)
Principal payments on capital lease obligations	(119)	(243)	(391)
Excess tax benefit from share-based award activity	1,721	1,869	609
Net cash provided by (used in) financing activities	1,582	1,571	(667)
Effect of exchange rate changes on cash and cash equivalents	(155)	(123)	8
Net increase in cash and cash equivalents	592	992	939
Cash and cash equivalents at beginning of period	4,315	3,323	2,384
Cash and cash equivalents at end of period	4,907	4,315	3,323
Cash paid during the period for:
Interest	10	14	38
Income taxes	273	184	82
Cash received during the period for:
Income taxes	3	6	421
Non-cash investing and financing activities:
Fair value of shares issued related to acquisitions of businesses	0	14,344	77
Promissory note payable issued in connection with an acquisition	198	0	0
Net change in accounts payable and accrued expenses and other current liabilities
Non-cash investing and financing activities:
Property and equipment incurred but not yet paid	88	91	53
Property and equipment acquired under capital leases
Non-cash investing and financing activities:
Property and equipment incurred but not yet paid	$ 0	$ 0	$ 11