Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement of Cash Flows [Abstract]
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF PERIOD	$ 22,965	$ 20,536	$ 32,173	$ 21,856	$ 21,032	$ 13,960
OPERATING ACTIVITIES:
Net income	2,134	2,883	8,320	7,046	11,347	8,902
Adjustments to reconcile net income to net cash from operating activities:
Depreciation and amortization of property and equipment and capitalized content costs, operating lease assets, and other	5,563	3,778	15,619	11,079	19,881	14,577
Stock-based compensation	1,779	1,350	5,024	4,001	6,441	5,180
Other operating expense (income), net	47	62	114	202	186	258
Other expense (income), net	388	96	246	22	443	17
Deferred income taxes	92	266	612	268	784	(40)
Changes in operating assets and liabilities:
Inventories	(381)	(1,094)	(1,762)	36	(3,112)	(2,220)
Accounts receivable, net and other	(1,181)	(2,884)	(3,776)	(3,220)	(5,172)	(5,983)
Accounts payable	226	3,894	(2,490)	(3,618)	4,393	5,285
Accrued expenses and other	(722)	237	(4,277)	(2,193)	(1,612)	(131)
Unearned revenue	(53)	0	1,225	623	1,753	759
Net cash provided by (used in) operating activities	7,892	8,588	18,855	14,246	35,332	26,604
INVESTING ACTIVITIES:
Purchases of property and equipment	(4,697)	(3,352)	(11,549)	(9,693)	(15,282)	(13,312)
Proceeds from property and equipment sales and incentives	1,312	825	2,800	1,490	3,414	2,073
Acquisitions, net of cash acquired, and other	(398)	(976)	(1,684)	(1,855)	(2,015)	(1,936)
Sales and maturities of marketable securities	7,251	1,964	15,056	6,301	16,994	9,787
Purchases of marketable securities	(8,542)	(4,033)	(25,368)	(5,040)	(27,428)	(7,390)
Net cash provided by (used in) investing activities	(5,074)	(5,572)	(20,745)	(8,797)	(24,317)	(10,778)
FINANCING ACTIVITIES:
Proceeds from long-term debt and other	702	143	1,175	363	1,581	472
Repayments of long-term debt and other	(355)	(183)	(819)	(533)	(953)	(1,675)
Principal repayments of finance leases	(2,307)	(2,247)	(6,848)	(5,544)	(8,754)	(7,016)
Principal repayments of financing obligations	0	(82)	(3)	(211)	(129)	(277)
Net cash provided by (used in) financing activities	(1,960)	(2,369)	(6,495)	(5,925)	(8,255)	(8,496)
Foreign currency effect on cash, cash equivalents, and restricted cash	(269)	(151)	(234)	(348)	(238)	(258)
Net increase (decrease) in cash, cash equivalents, and restricted cash	589	496	(8,619)	(824)	2,522	7,072
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	23,554	21,032	23,554	21,032	23,554	21,032
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long-term debt	287	283	720	733	842	907
Cash paid for operating leases	872	0	2,420	0	2,420	0
Cash paid for interest on finance leases	167	118	481	277	585	335
Cash paid for interest on financing obligations	14	47	20	142	72	168
Cash paid for income taxes, net of refunds	241	200	692	1,013	863	1,106
Assets acquired under operating leases	2,299	0	5,393	0	5,393	0
Property and equipment acquired under finance leases	3,606	2,329	9,541	6,934	13,222	9,704
Property and equipment acquired under build-to-suit arrangements	$ 390	$ 962	$ 1,109	$ 2,498	$ 2,252	$ 3,340