Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Cash Flows [Abstract]
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF PERIOD	$ 17,616	$ 16,301	$ 21,856	$ 19,934	$ 13,851	$ 12,977
OPERATING ACTIVITIES:
Net income	2,534	197	4,163	921	6,275	1,922
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	3,630	2,633	7,301	5,068	13,711	9,448
Stock-based compensation	1,468	1,158	2,651	1,952	4,914	3,615
Other operating expense, net	85	60	141	102	240	164
Other expense (income), net	110	(120)	(75)	(160)	(207)	(162)
Deferred income taxes	(139)	376	3	354	(380)	(8)
Changes in operating assets and liabilities:
Inventories	(1,090)	(682)	1,130	265	(2,717)	(1,874)
Accounts receivable, net and other	(1,364)	(1,221)	(336)	(257)	(4,859)	(2,925)
Accounts payable	2,703	2,088	(7,513)	(4,777)	4,364	5,046
Accrued expenses and other	(205)	(252)	(2,430)	(1,657)	(491)	1,039
Unearned revenue	(283)	(387)	623	419	943	1,537
Net cash provided by (used in) operating activities	7,449	3,850	5,658	2,230	21,793	17,802
INVESTING ACTIVITIES:
Purchases of property and equipment, including internal-use software and website development	(3,243)	(3,113)	(6,341)	(5,261)	(13,035)	(9,763)
Proceeds from property and equipment incentives	294	612	665	899	1,663	1,556
Acquisitions, net of cash acquired, and other	(866)	(633)	(879)	(678)	(14,173)	(765)
Sales and maturities of marketable securities	1,660	2,070	4,337	3,980	10,034	6,530
Purchases of marketable securities	(537)	(4,210)	(1,007)	(5,564)	(8,173)	(10,731)
Net cash provided by (used in) investing activities	(2,692)	(5,274)	(3,225)	(6,624)	(23,684)	(13,173)
FINANCING ACTIVITIES:
Proceeds from long-term debt and other	96	49	221	70	16,380	612
Repayments of long-term debt and other	(149)	(48)	(351)	(88)	(1,564)	(170)
Principal repayments of capital lease obligations	(1,284)	(1,228)	(3,297)	(2,060)	(6,037)	(4,003)
Principal repayments of finance lease obligations	(57)	(47)	(129)	(85)	(244)	(170)
Net cash provided by (used in) financing activities	(1,394)	(1,274)	(3,556)	(2,163)	8,535	(3,731)
Foreign currency effect on cash, cash equivalents, and restricted cash	(443)	248	(197)	474	41	(24)
Net increase (decrease) in cash, cash equivalents, and restricted cash	2,920	(2,450)	(1,320)	(6,083)	6,685	874
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	20,536	13,851	20,536	13,851	20,536	13,851
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long-term debt	168	146	450	150	628	295
Cash paid for interest on capital and finance lease obligations	125	62	254	123	449	234
Cash paid for income taxes, net of refunds	300	447	813	693	1,077	879
Property and equipment acquired under capital leases	2,335	2,724	4,605	4,612	9,631	8,019
Property and equipment acquired under build-to-suit leases	$ 795	$ 748	$ 1,536	$ 1,948	$ 3,128	$ 2,575