Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Cash Flows [Abstract]
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF PERIOD	$ 36,410	$ 32,173	$ 23,507	$ 17,616
OPERATING ACTIVITIES:
Net income	2,535	3,561	10,563	12,005
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	5,362	4,854	22,297	16,524
Stock-based compensation	1,757	1,274	7,347	5,509
Other operating expense (income), net	67	(13)	244	205
Other expense (income), net	565	(135)	451	268
Deferred income taxes	322	415	704	714
Changes in operating assets and liabilities:
Inventories	1,392	719	(2,605)	(2,815)
Accounts receivable, net and other	1,262	(401)	(6,018)	(6,043)
Accounts payable	(8,044)	(6,384)	6,532	7,095
Accrued expenses and other	(2,761)	(2,932)	(1,213)	(235)
Unearned revenue	607	888	1,430	1,133
Net cash provided by (used in) operating activities	3,064	1,846	39,732	34,360
INVESTING ACTIVITIES:
Purchases of property and equipment	(6,795)	(3,290)	(20,365)	(13,619)
Proceeds from property and equipment sales and incentives	1,367	569	4,970	2,303
Acquisitions, net of cash acquired, and other	(91)	(1,169)	(1,384)	(3,342)
Sales and maturities of marketable securities	11,626	2,643	31,664	8,205
Purchases of marketable securities	(15,001)	(6,876)	(39,938)	(13,506)
Net cash provided by (used in) investing activities	(8,894)	(8,123)	(25,053)	(19,959)
FINANCING ACTIVITIES:
Proceeds from long-term debt and other	693	190	2,776	833
Repayments of long-term debt and other	(667)	(351)	(3,000)	(817)
Principal repayments of finance leases	(2,600)	(2,214)	(10,013)	(7,649)
Principal repayments of financing obligations	(17)	(2)	(43)	(266)
Net cash provided by (used in) financing activities	(2,591)	(2,377)	(10,280)	(7,899)
Foreign currency effect on cash, cash equivalents, and restricted cash	(484)	(12)	(401)	(611)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(8,905)	(8,666)	3,998	5,891
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	27,505	23,507	27,505	23,507
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on long-term debt	290	286	879	858
Cash paid for operating leases	1,029	709	3,680	709
Cash paid for interest on finance leases	168	165	650	471
Cash paid for interest on financing obligations	22	2	59	142
Cash paid for income taxes, net of refunds	305	168	1,017	840
Assets acquired under operating leases	2,408	875	9,403	875
Property and equipment acquired under finance leases	2,166	2,628	13,262	10,972
Property and equipment acquired under build-to-suit arrangements	$ 379	$ 436	$ 1,304	$ 3,336