Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	$ 12,521	$ 10,269	$ 15,890	$ 14,557	$ 10,709	$ 5,258
OPERATING ACTIVITIES:
Net income	252	79	1,622	114	2,105	328
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	2,084	1,599	5,819	4,529	7,572	5,908
Stock-based compensation	776	544	2,088	1,513	2,694	1,921
Other operating expense, net	31	34	128	120	163	156
Other expense (income), net	(23)	58	(41)	170	39	248
Deferred income taxes	(81)	(63)	36	(108)	226	76
Excess tax benefits from stock-based compensation	(173)	(95)	(493)	(212)	(401)	(96)
Changes in operating assets and liabilities:
Inventories	(1,095)	(1,537)	(383)	(844)	(1,726)	(1,983)
Accounts receivable, net and other	(671)	(588)	(1,443)	(577)	(2,621)	(1,681)
Accounts payable	2,540	2,030	(2,252)	(1,846)	3,887	3,207
Accrued expenses and other	441	143	(531)	(925)	1,306	525
Additions to unearned revenue	2,802	1,779	7,956	4,979	10,377	6,358
Amortization of previously unearned revenue	(2,397)	(1,373)	(6,715)	(3,805)	(9,018)	(5,144)
Net cash provided by (used in) operating activities	4,486	2,610	5,791	3,108	14,603	9,823
INVESTING ACTIVITIES:
Purchases of property and equipment, including internal-use software and website development, net	(1,841)	(1,195)	(4,731)	(3,280)	(6,040)	(4,424)
Acquisitions, net of cash acquired, and other	(84)	(105)	(113)	(478)	(430)	(531)
Sales and maturities of marketable securities	1,431	1,045	3,500	1,890	4,635	2,244
Purchases of marketable securities	(2,076)	(1,122)	(4,358)	(2,732)	(5,717)	(4,354)
Net cash provided by (used in) investing activities	(2,570)	(1,377)	(5,702)	(4,600)	(7,552)	(7,065)
FINANCING ACTIVITIES:
Excess tax benefits from stock-based compensation	173	95	493	212	401	96
Proceeds from Long-term Debt and other	8	33	83	260	176	6,241
Repayments of long-term debt and other	(26)	(181)	(271)	(712)	(1,212)	(894)
Principal repayments of capital lease obligations	(938)	(656)	(2,855)	(1,738)	(3,579)	(2,144)
Principal repayments of finance lease obligations	(44)	(21)	(105)	(95)	(131)	(163)
Net cash provided by (used in) financing activities	(827)	(730)	(2,655)	(2,073)	(4,345)	3,136
Foreign currency effect on cash and cash equivalents	46	(63)	332	(283)	241	(443)
Net increase (decrease) in cash and cash equivalents	1,135	440	(2,234)	(3,848)	2,947	5,451
CASH AND CASH EQUIVALENTS, END OF PERIOD	13,656	10,709	13,656	10,709	13,656	10,709
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long-term debt	1	7	146	177	295	212
Cash paid for interest on capital and finance lease obligations	50	41	145	109	188	138
Cash paid for income taxes, net of refunds	91	80	317	200	390	230
Assets Held under Capital Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Property and equipment acquired	1,369	1,047	3,666	3,385	4,998	4,599
Assets Held under Build-To-Suit Leases
SUPPLEMENTAL CASH FLOW INFORMATION:
Property and equipment acquired	$ 211	$ 125	$ 793	$ 381	$ 956	$ 595