Consolidated Statements of Cash Flows - USD ($) $ in Millions	3 Months Ended		12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Cash Flows [Abstract]
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF PERIOD	$ 42,377	$ 36,410	$ 27,505	$ 23,507
OPERATING ACTIVITIES:
Net income	8,107	2,535	26,903	10,563
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	7,508	5,362	27,397	22,297
Stock-based compensation	2,306	1,757	9,757	7,347
Other operating expense (income), net	30	67	(108)	244
Other expense (income), net	(1,456)	565	(4,603)	451
Deferred income taxes	1,703	322	827	704
Changes in operating assets and liabilities:
Inventories	(304)	1,392	(4,545)	(2,605)
Accounts receivable, net and other	(2,255)	1,262	(11,686)	(6,018)
Accounts payable	(8,266)	(8,044)	17,258	6,532
Accrued expenses and other	(4,060)	(2,761)	4,455	(1,213)
Unearned revenue	900	607	1,558	1,430
Net cash provided by (used in) operating activities	4,213	3,064	67,213	39,732
INVESTING ACTIVITIES:
Purchases of property and equipment	(12,082)	(6,795)	(45,427)	(20,365)
Proceeds from property and equipment sales and incentives	895	1,367	4,624	4,970
Acquisitions, net of cash acquired, and other	(630)	(91)	(2,864)	(1,384)
Sales and maturities of marketable securities	17,826	11,626	56,437	31,664
Purchases of marketable securities	(14,675)	(15,001)	(72,153)	(39,938)
Net cash provided by (used in) investing activities	(8,666)	(8,894)	(59,383)	(25,053)
FINANCING ACTIVITIES:
Proceeds from short-term debt, and other	1,926	617	8,105	1,934
Repayments of short-term debt, and other	(2,001)	(631)	(7,547)	(1,860)
Proceeds from long-term debt	111	76	10,560	842
Repayments of long-term debt	(39)	(36)	(1,556)	(1,140)
Principal repayments of finance leases	(3,406)	(2,600)	(11,448)	(10,013)
Principal repayments of financing obligations	(67)	(17)	(103)	(43)
Net cash provided by (used in) financing activities	(3,476)	(2,591)	(1,989)	(10,280)
Foreign currency effect on cash, cash equivalents, and restricted cash	(293)	(484)	809	(401)
Net increase (decrease) in cash, cash equivalents, and restricted cash	(8,222)	(8,905)	6,650	3,998
CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD	$ 34,155	$ 27,505	$ 34,155	$ 27,505