Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Cash Flows [Abstract]
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	$ 19,334	$ 15,890	$ 14,557
OPERATING ACTIVITIES:
Net income	3,033	2,371	596
Adjustments to reconcile net income to net cash from operating activities:
Depreciation of property and equipment, including internal-use software and website development, and other amortization, including capitalized content costs	11,478	8,116	6,281
Stock-based compensation	4,215	2,975	2,119
Other operating expense, net	202	160	155
Other expense (income), net	(292)	(20)	250
Deferred income taxes	(29)	(246)	81
Changes in operating assets and liabilities:
Inventories	(3,583)	(1,426)	(2,187)
Accounts receivable, net and other	(4,786)	(3,367)	(1,755)
Accounts payable	7,175	5,030	4,294
Accrued expenses and other	283	1,724	913
Unearned revenue	738	1,955	1,292
Net cash provided by (used in) operating activities	18,434	17,272	12,039
INVESTING ACTIVITIES:
Purchases of property and equipment, including internal-use software and website development	(11,955)	(7,804)	(5,387)
Proceeds from property and equipment incentives	1,897	1,067	798
Acquisitions, net of cash acquired, and other	(13,972)	(116)	(795)
Sales and maturities of marketable securities	9,988	4,733	3,025
Purchases of marketable securities	(13,777)	(7,756)	(4,091)
Net cash provided by (used in) investing activities	(27,819)	(9,876)	(6,450)
FINANCING ACTIVITIES:
Proceeds from long-term debt and other	16,231	621	353
Repayments of long-term debt and other	(1,372)	(354)	(1,652)
Principal repayments of capital lease obligations	(4,799)	(3,860)	(2,462)
Principal repayments of finance lease obligations	(200)	(147)	(121)
Net cash provided by (used in) financing activities	9,860	(3,740)	(3,882)
Foreign currency effect on cash and cash equivalents	713	(212)	(374)
Net increase (decrease) in cash and cash equivalents	1,188	3,444	1,333
CASH AND CASH EQUIVALENTS, END OF PERIOD	20,522	19,334	15,890
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long-term debt	328	290	325
Cash paid for interest on capital and finance lease obligations	319	206	153
Cash paid for income taxes, net of refunds	957	412	273
Property and equipment acquired under capital leases	9,637	5,704	4,717
Property and equipment acquired under build-to-suit leases	$ 3,541	$ 1,209	$ 544